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1/*
2 * sysfs.c - sysfs support implementation.
3 *
4 * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
5 * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
18 */
19
20#include <linux/kobject.h>
21
22#include "nilfs.h"
23#include "mdt.h"
24#include "sufile.h"
25#include "cpfile.h"
26#include "sysfs.h"
27
28/* /sys/fs/<nilfs>/ */
29static struct kset *nilfs_kset;
30
31#define NILFS_SHOW_TIME(time_t_val, buf) ({ \
32 struct tm res; \
33 int count = 0; \
34 time64_to_tm(time_t_val, 0, &res); \
35 res.tm_year += 1900; \
36 res.tm_mon += 1; \
37 count = scnprintf(buf, PAGE_SIZE, \
38 "%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \
39 res.tm_year, res.tm_mon, res.tm_mday, \
40 res.tm_hour, res.tm_min, res.tm_sec);\
41 count; \
42})
43
44#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
45static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
46 struct attribute *attr, char *buf) \
47{ \
48 struct the_nilfs *nilfs = container_of(kobj->parent, \
49 struct the_nilfs, \
50 ns_##parent_name##_kobj); \
51 struct nilfs_##name##_attr *a = container_of(attr, \
52 struct nilfs_##name##_attr, \
53 attr); \
54 return a->show ? a->show(a, nilfs, buf) : 0; \
55} \
56static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
57 struct attribute *attr, \
58 const char *buf, size_t len) \
59{ \
60 struct the_nilfs *nilfs = container_of(kobj->parent, \
61 struct the_nilfs, \
62 ns_##parent_name##_kobj); \
63 struct nilfs_##name##_attr *a = container_of(attr, \
64 struct nilfs_##name##_attr, \
65 attr); \
66 return a->store ? a->store(a, nilfs, buf, len) : 0; \
67} \
68static const struct sysfs_ops nilfs_##name##_attr_ops = { \
69 .show = nilfs_##name##_attr_show, \
70 .store = nilfs_##name##_attr_store, \
71}
72
73#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
74static void nilfs_##name##_attr_release(struct kobject *kobj) \
75{ \
76 struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
77 struct the_nilfs *nilfs = container_of(kobj->parent, \
78 struct the_nilfs, \
79 ns_##parent_name##_kobj); \
80 subgroups = nilfs->ns_##parent_name##_subgroups; \
81 complete(&subgroups->sg_##name##_kobj_unregister); \
82} \
83static struct kobj_type nilfs_##name##_ktype = { \
84 .default_attrs = nilfs_##name##_attrs, \
85 .sysfs_ops = &nilfs_##name##_attr_ops, \
86 .release = nilfs_##name##_attr_release, \
87}
88
89#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
90static int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
91{ \
92 struct kobject *parent; \
93 struct kobject *kobj; \
94 struct completion *kobj_unregister; \
95 struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
96 int err; \
97 subgroups = nilfs->ns_##parent_name##_subgroups; \
98 kobj = &subgroups->sg_##name##_kobj; \
99 kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
100 parent = &nilfs->ns_##parent_name##_kobj; \
101 kobj->kset = nilfs_kset; \
102 init_completion(kobj_unregister); \
103 err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
104 #name); \
105 if (err) \
106 return err; \
107 return 0; \
108} \
109static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
110{ \
111 kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
112}
113
114/************************************************************************
115 * NILFS snapshot attrs *
116 ************************************************************************/
117
118static ssize_t
119nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
120 struct nilfs_root *root, char *buf)
121{
122 return snprintf(buf, PAGE_SIZE, "%llu\n",
123 (unsigned long long)atomic64_read(&root->inodes_count));
124}
125
126static ssize_t
127nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
128 struct nilfs_root *root, char *buf)
129{
130 return snprintf(buf, PAGE_SIZE, "%llu\n",
131 (unsigned long long)atomic64_read(&root->blocks_count));
132}
133
134static const char snapshot_readme_str[] =
135 "The group contains details about mounted snapshot.\n\n"
136 "(1) inodes_count\n\tshow number of inodes for snapshot.\n\n"
137 "(2) blocks_count\n\tshow number of blocks for snapshot.\n\n";
138
139static ssize_t
140nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
141 struct nilfs_root *root, char *buf)
142{
143 return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
144}
145
146NILFS_SNAPSHOT_RO_ATTR(inodes_count);
147NILFS_SNAPSHOT_RO_ATTR(blocks_count);
148NILFS_SNAPSHOT_RO_ATTR(README);
149
150static struct attribute *nilfs_snapshot_attrs[] = {
151 NILFS_SNAPSHOT_ATTR_LIST(inodes_count),
152 NILFS_SNAPSHOT_ATTR_LIST(blocks_count),
153 NILFS_SNAPSHOT_ATTR_LIST(README),
154 NULL,
155};
156
157static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
158 struct attribute *attr, char *buf)
159{
160 struct nilfs_root *root =
161 container_of(kobj, struct nilfs_root, snapshot_kobj);
162 struct nilfs_snapshot_attr *a =
163 container_of(attr, struct nilfs_snapshot_attr, attr);
164
165 return a->show ? a->show(a, root, buf) : 0;
166}
167
168static ssize_t nilfs_snapshot_attr_store(struct kobject *kobj,
169 struct attribute *attr,
170 const char *buf, size_t len)
171{
172 struct nilfs_root *root =
173 container_of(kobj, struct nilfs_root, snapshot_kobj);
174 struct nilfs_snapshot_attr *a =
175 container_of(attr, struct nilfs_snapshot_attr, attr);
176
177 return a->store ? a->store(a, root, buf, len) : 0;
178}
179
180static void nilfs_snapshot_attr_release(struct kobject *kobj)
181{
182 struct nilfs_root *root = container_of(kobj, struct nilfs_root,
183 snapshot_kobj);
184 complete(&root->snapshot_kobj_unregister);
185}
186
187static const struct sysfs_ops nilfs_snapshot_attr_ops = {
188 .show = nilfs_snapshot_attr_show,
189 .store = nilfs_snapshot_attr_store,
190};
191
192static struct kobj_type nilfs_snapshot_ktype = {
193 .default_attrs = nilfs_snapshot_attrs,
194 .sysfs_ops = &nilfs_snapshot_attr_ops,
195 .release = nilfs_snapshot_attr_release,
196};
197
198int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
199{
200 struct the_nilfs *nilfs;
201 struct kobject *parent;
202 int err;
203
204 nilfs = root->nilfs;
205 parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj;
206 root->snapshot_kobj.kset = nilfs_kset;
207 init_completion(&root->snapshot_kobj_unregister);
208
209 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
210 err = kobject_init_and_add(&root->snapshot_kobj,
211 &nilfs_snapshot_ktype,
212 &nilfs->ns_dev_kobj,
213 "current_checkpoint");
214 } else {
215 err = kobject_init_and_add(&root->snapshot_kobj,
216 &nilfs_snapshot_ktype,
217 parent,
218 "%llu", root->cno);
219 }
220
221 if (err)
222 return err;
223
224 return 0;
225}
226
227void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
228{
229 kobject_del(&root->snapshot_kobj);
230}
231
232/************************************************************************
233 * NILFS mounted snapshots attrs *
234 ************************************************************************/
235
236static const char mounted_snapshots_readme_str[] =
237 "The mounted_snapshots group contains group for\n"
238 "every mounted snapshot.\n";
239
240static ssize_t
241nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
242 struct the_nilfs *nilfs, char *buf)
243{
244 return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
245}
246
247NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
248
249static struct attribute *nilfs_mounted_snapshots_attrs[] = {
250 NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
251 NULL,
252};
253
254NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
255NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
256NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
257
258/************************************************************************
259 * NILFS checkpoints attrs *
260 ************************************************************************/
261
262static ssize_t
263nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
264 struct the_nilfs *nilfs,
265 char *buf)
266{
267 __u64 ncheckpoints;
268 struct nilfs_cpstat cpstat;
269 int err;
270
271 down_read(&nilfs->ns_segctor_sem);
272 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
273 up_read(&nilfs->ns_segctor_sem);
274 if (err < 0) {
275 nilfs_msg(nilfs->ns_sb, KERN_ERR,
276 "unable to get checkpoint stat: err=%d", err);
277 return err;
278 }
279
280 ncheckpoints = cpstat.cs_ncps;
281
282 return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
283}
284
285static ssize_t
286nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
287 struct the_nilfs *nilfs,
288 char *buf)
289{
290 __u64 nsnapshots;
291 struct nilfs_cpstat cpstat;
292 int err;
293
294 down_read(&nilfs->ns_segctor_sem);
295 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
296 up_read(&nilfs->ns_segctor_sem);
297 if (err < 0) {
298 nilfs_msg(nilfs->ns_sb, KERN_ERR,
299 "unable to get checkpoint stat: err=%d", err);
300 return err;
301 }
302
303 nsnapshots = cpstat.cs_nsss;
304
305 return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
306}
307
308static ssize_t
309nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
310 struct the_nilfs *nilfs,
311 char *buf)
312{
313 __u64 last_cno;
314
315 spin_lock(&nilfs->ns_last_segment_lock);
316 last_cno = nilfs->ns_last_cno;
317 spin_unlock(&nilfs->ns_last_segment_lock);
318
319 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
320}
321
322static ssize_t
323nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
324 struct the_nilfs *nilfs,
325 char *buf)
326{
327 __u64 cno;
328
329 down_read(&nilfs->ns_segctor_sem);
330 cno = nilfs->ns_cno;
331 up_read(&nilfs->ns_segctor_sem);
332
333 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
334}
335
336static const char checkpoints_readme_str[] =
337 "The checkpoints group contains attributes that describe\n"
338 "details about volume's checkpoints.\n\n"
339 "(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n"
340 "(2) snapshots_number\n\tshow number of snapshots on volume.\n\n"
341 "(3) last_seg_checkpoint\n"
342 "\tshow checkpoint number of the latest segment.\n\n"
343 "(4) next_checkpoint\n\tshow next checkpoint number.\n\n";
344
345static ssize_t
346nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
347 struct the_nilfs *nilfs, char *buf)
348{
349 return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
350}
351
352NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
353NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
354NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
355NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
356NILFS_CHECKPOINTS_RO_ATTR(README);
357
358static struct attribute *nilfs_checkpoints_attrs[] = {
359 NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number),
360 NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number),
361 NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint),
362 NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint),
363 NILFS_CHECKPOINTS_ATTR_LIST(README),
364 NULL,
365};
366
367NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
368NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
369NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
370
371/************************************************************************
372 * NILFS segments attrs *
373 ************************************************************************/
374
375static ssize_t
376nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
377 struct the_nilfs *nilfs,
378 char *buf)
379{
380 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
381}
382
383static ssize_t
384nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
385 struct the_nilfs *nilfs,
386 char *buf)
387{
388 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
389}
390
391static ssize_t
392nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
393 struct the_nilfs *nilfs,
394 char *buf)
395{
396 unsigned long ncleansegs;
397
398 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
399 ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
400 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
401
402 return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
403}
404
405static ssize_t
406nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
407 struct the_nilfs *nilfs,
408 char *buf)
409{
410 struct nilfs_sustat sustat;
411 int err;
412
413 down_read(&nilfs->ns_segctor_sem);
414 err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
415 up_read(&nilfs->ns_segctor_sem);
416 if (err < 0) {
417 nilfs_msg(nilfs->ns_sb, KERN_ERR,
418 "unable to get segment stat: err=%d", err);
419 return err;
420 }
421
422 return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
423}
424
425static const char segments_readme_str[] =
426 "The segments group contains attributes that describe\n"
427 "details about volume's segments.\n\n"
428 "(1) segments_number\n\tshow number of segments on volume.\n\n"
429 "(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"
430 "(3) clean_segments\n\tshow count of clean segments.\n\n"
431 "(4) dirty_segments\n\tshow count of dirty segments.\n\n";
432
433static ssize_t
434nilfs_segments_README_show(struct nilfs_segments_attr *attr,
435 struct the_nilfs *nilfs,
436 char *buf)
437{
438 return snprintf(buf, PAGE_SIZE, segments_readme_str);
439}
440
441NILFS_SEGMENTS_RO_ATTR(segments_number);
442NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
443NILFS_SEGMENTS_RO_ATTR(clean_segments);
444NILFS_SEGMENTS_RO_ATTR(dirty_segments);
445NILFS_SEGMENTS_RO_ATTR(README);
446
447static struct attribute *nilfs_segments_attrs[] = {
448 NILFS_SEGMENTS_ATTR_LIST(segments_number),
449 NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),
450 NILFS_SEGMENTS_ATTR_LIST(clean_segments),
451 NILFS_SEGMENTS_ATTR_LIST(dirty_segments),
452 NILFS_SEGMENTS_ATTR_LIST(README),
453 NULL,
454};
455
456NILFS_DEV_INT_GROUP_OPS(segments, dev);
457NILFS_DEV_INT_GROUP_TYPE(segments, dev);
458NILFS_DEV_INT_GROUP_FNS(segments, dev);
459
460/************************************************************************
461 * NILFS segctor attrs *
462 ************************************************************************/
463
464static ssize_t
465nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
466 struct the_nilfs *nilfs,
467 char *buf)
468{
469 sector_t last_pseg;
470
471 spin_lock(&nilfs->ns_last_segment_lock);
472 last_pseg = nilfs->ns_last_pseg;
473 spin_unlock(&nilfs->ns_last_segment_lock);
474
475 return snprintf(buf, PAGE_SIZE, "%llu\n",
476 (unsigned long long)last_pseg);
477}
478
479static ssize_t
480nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
481 struct the_nilfs *nilfs,
482 char *buf)
483{
484 u64 last_seq;
485
486 spin_lock(&nilfs->ns_last_segment_lock);
487 last_seq = nilfs->ns_last_seq;
488 spin_unlock(&nilfs->ns_last_segment_lock);
489
490 return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
491}
492
493static ssize_t
494nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_attr *attr,
495 struct the_nilfs *nilfs,
496 char *buf)
497{
498 __u64 last_cno;
499
500 spin_lock(&nilfs->ns_last_segment_lock);
501 last_cno = nilfs->ns_last_cno;
502 spin_unlock(&nilfs->ns_last_segment_lock);
503
504 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
505}
506
507static ssize_t
508nilfs_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
509 struct the_nilfs *nilfs,
510 char *buf)
511{
512 u64 seg_seq;
513
514 down_read(&nilfs->ns_segctor_sem);
515 seg_seq = nilfs->ns_seg_seq;
516 up_read(&nilfs->ns_segctor_sem);
517
518 return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
519}
520
521static ssize_t
522nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
523 struct the_nilfs *nilfs,
524 char *buf)
525{
526 __u64 segnum;
527
528 down_read(&nilfs->ns_segctor_sem);
529 segnum = nilfs->ns_segnum;
530 up_read(&nilfs->ns_segctor_sem);
531
532 return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
533}
534
535static ssize_t
536nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
537 struct the_nilfs *nilfs,
538 char *buf)
539{
540 __u64 nextnum;
541
542 down_read(&nilfs->ns_segctor_sem);
543 nextnum = nilfs->ns_nextnum;
544 up_read(&nilfs->ns_segctor_sem);
545
546 return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
547}
548
549static ssize_t
550nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
551 struct the_nilfs *nilfs,
552 char *buf)
553{
554 unsigned long pseg_offset;
555
556 down_read(&nilfs->ns_segctor_sem);
557 pseg_offset = nilfs->ns_pseg_offset;
558 up_read(&nilfs->ns_segctor_sem);
559
560 return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
561}
562
563static ssize_t
564nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_attr *attr,
565 struct the_nilfs *nilfs,
566 char *buf)
567{
568 __u64 cno;
569
570 down_read(&nilfs->ns_segctor_sem);
571 cno = nilfs->ns_cno;
572 up_read(&nilfs->ns_segctor_sem);
573
574 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
575}
576
577static ssize_t
578nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
579 struct the_nilfs *nilfs,
580 char *buf)
581{
582 time64_t ctime;
583
584 down_read(&nilfs->ns_segctor_sem);
585 ctime = nilfs->ns_ctime;
586 up_read(&nilfs->ns_segctor_sem);
587
588 return NILFS_SHOW_TIME(ctime, buf);
589}
590
591static ssize_t
592nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
593 struct the_nilfs *nilfs,
594 char *buf)
595{
596 time64_t ctime;
597
598 down_read(&nilfs->ns_segctor_sem);
599 ctime = nilfs->ns_ctime;
600 up_read(&nilfs->ns_segctor_sem);
601
602 return snprintf(buf, PAGE_SIZE, "%llu\n", ctime);
603}
604
605static ssize_t
606nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
607 struct the_nilfs *nilfs,
608 char *buf)
609{
610 time64_t nongc_ctime;
611
612 down_read(&nilfs->ns_segctor_sem);
613 nongc_ctime = nilfs->ns_nongc_ctime;
614 up_read(&nilfs->ns_segctor_sem);
615
616 return NILFS_SHOW_TIME(nongc_ctime, buf);
617}
618
619static ssize_t
620nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
621 struct the_nilfs *nilfs,
622 char *buf)
623{
624 time64_t nongc_ctime;
625
626 down_read(&nilfs->ns_segctor_sem);
627 nongc_ctime = nilfs->ns_nongc_ctime;
628 up_read(&nilfs->ns_segctor_sem);
629
630 return snprintf(buf, PAGE_SIZE, "%llu\n", nongc_ctime);
631}
632
633static ssize_t
634nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
635 struct the_nilfs *nilfs,
636 char *buf)
637{
638 u32 ndirtyblks;
639
640 down_read(&nilfs->ns_segctor_sem);
641 ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
642 up_read(&nilfs->ns_segctor_sem);
643
644 return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
645}
646
647static const char segctor_readme_str[] =
648 "The segctor group contains attributes that describe\n"
649 "segctor thread activity details.\n\n"
650 "(1) last_pseg_block\n"
651 "\tshow start block number of the latest segment.\n\n"
652 "(2) last_seg_sequence\n"
653 "\tshow sequence value of the latest segment.\n\n"
654 "(3) last_seg_checkpoint\n"
655 "\tshow checkpoint number of the latest segment.\n\n"
656 "(4) current_seg_sequence\n\tshow segment sequence counter.\n\n"
657 "(5) current_last_full_seg\n"
658 "\tshow index number of the latest full segment.\n\n"
659 "(6) next_full_seg\n"
660 "\tshow index number of the full segment index to be used next.\n\n"
661 "(7) next_pseg_offset\n"
662 "\tshow offset of next partial segment in the current full segment.\n\n"
663 "(8) next_checkpoint\n\tshow next checkpoint number.\n\n"
664 "(9) last_seg_write_time\n"
665 "\tshow write time of the last segment in human-readable format.\n\n"
666 "(10) last_seg_write_time_secs\n"
667 "\tshow write time of the last segment in seconds.\n\n"
668 "(11) last_nongc_write_time\n"
669 "\tshow write time of the last segment not for cleaner operation "
670 "in human-readable format.\n\n"
671 "(12) last_nongc_write_time_secs\n"
672 "\tshow write time of the last segment not for cleaner operation "
673 "in seconds.\n\n"
674 "(13) dirty_data_blocks_count\n"
675 "\tshow number of dirty data blocks.\n\n";
676
677static ssize_t
678nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
679 struct the_nilfs *nilfs, char *buf)
680{
681 return snprintf(buf, PAGE_SIZE, segctor_readme_str);
682}
683
684NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
685NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
686NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
687NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
688NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
689NILFS_SEGCTOR_RO_ATTR(next_full_seg);
690NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
691NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
692NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
693NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
694NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
695NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
696NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
697NILFS_SEGCTOR_RO_ATTR(README);
698
699static struct attribute *nilfs_segctor_attrs[] = {
700 NILFS_SEGCTOR_ATTR_LIST(last_pseg_block),
701 NILFS_SEGCTOR_ATTR_LIST(last_seg_sequence),
702 NILFS_SEGCTOR_ATTR_LIST(last_seg_checkpoint),
703 NILFS_SEGCTOR_ATTR_LIST(current_seg_sequence),
704 NILFS_SEGCTOR_ATTR_LIST(current_last_full_seg),
705 NILFS_SEGCTOR_ATTR_LIST(next_full_seg),
706 NILFS_SEGCTOR_ATTR_LIST(next_pseg_offset),
707 NILFS_SEGCTOR_ATTR_LIST(next_checkpoint),
708 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time),
709 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time_secs),
710 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time),
711 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time_secs),
712 NILFS_SEGCTOR_ATTR_LIST(dirty_data_blocks_count),
713 NILFS_SEGCTOR_ATTR_LIST(README),
714 NULL,
715};
716
717NILFS_DEV_INT_GROUP_OPS(segctor, dev);
718NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
719NILFS_DEV_INT_GROUP_FNS(segctor, dev);
720
721/************************************************************************
722 * NILFS superblock attrs *
723 ************************************************************************/
724
725static ssize_t
726nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
727 struct the_nilfs *nilfs,
728 char *buf)
729{
730 time64_t sbwtime;
731
732 down_read(&nilfs->ns_sem);
733 sbwtime = nilfs->ns_sbwtime;
734 up_read(&nilfs->ns_sem);
735
736 return NILFS_SHOW_TIME(sbwtime, buf);
737}
738
739static ssize_t
740nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
741 struct the_nilfs *nilfs,
742 char *buf)
743{
744 time64_t sbwtime;
745
746 down_read(&nilfs->ns_sem);
747 sbwtime = nilfs->ns_sbwtime;
748 up_read(&nilfs->ns_sem);
749
750 return snprintf(buf, PAGE_SIZE, "%llu\n", sbwtime);
751}
752
753static ssize_t
754nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
755 struct the_nilfs *nilfs,
756 char *buf)
757{
758 unsigned int sbwcount;
759
760 down_read(&nilfs->ns_sem);
761 sbwcount = nilfs->ns_sbwcount;
762 up_read(&nilfs->ns_sem);
763
764 return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
765}
766
767static ssize_t
768nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
769 struct the_nilfs *nilfs,
770 char *buf)
771{
772 unsigned int sb_update_freq;
773
774 down_read(&nilfs->ns_sem);
775 sb_update_freq = nilfs->ns_sb_update_freq;
776 up_read(&nilfs->ns_sem);
777
778 return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
779}
780
781static ssize_t
782nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
783 struct the_nilfs *nilfs,
784 const char *buf, size_t count)
785{
786 unsigned int val;
787 int err;
788
789 err = kstrtouint(skip_spaces(buf), 0, &val);
790 if (err) {
791 nilfs_msg(nilfs->ns_sb, KERN_ERR,
792 "unable to convert string: err=%d", err);
793 return err;
794 }
795
796 if (val < NILFS_SB_FREQ) {
797 val = NILFS_SB_FREQ;
798 nilfs_msg(nilfs->ns_sb, KERN_WARNING,
799 "superblock update frequency cannot be lesser than 10 seconds");
800 }
801
802 down_write(&nilfs->ns_sem);
803 nilfs->ns_sb_update_freq = val;
804 up_write(&nilfs->ns_sem);
805
806 return count;
807}
808
809static const char sb_readme_str[] =
810 "The superblock group contains attributes that describe\n"
811 "superblock's details.\n\n"
812 "(1) sb_write_time\n\tshow previous write time of super block "
813 "in human-readable format.\n\n"
814 "(2) sb_write_time_secs\n\tshow previous write time of super block "
815 "in seconds.\n\n"
816 "(3) sb_write_count\n\tshow write count of super block.\n\n"
817 "(4) sb_update_frequency\n"
818 "\tshow/set interval of periodical update of superblock (in seconds).\n\n"
819 "\tYou can set preferable frequency of superblock update by command:\n\n"
820 "\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
821
822static ssize_t
823nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
824 struct the_nilfs *nilfs, char *buf)
825{
826 return snprintf(buf, PAGE_SIZE, sb_readme_str);
827}
828
829NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
830NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
831NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
832NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
833NILFS_SUPERBLOCK_RO_ATTR(README);
834
835static struct attribute *nilfs_superblock_attrs[] = {
836 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
837 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
838 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
839 NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
840 NILFS_SUPERBLOCK_ATTR_LIST(README),
841 NULL,
842};
843
844NILFS_DEV_INT_GROUP_OPS(superblock, dev);
845NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
846NILFS_DEV_INT_GROUP_FNS(superblock, dev);
847
848/************************************************************************
849 * NILFS device attrs *
850 ************************************************************************/
851
852static
853ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
854 struct the_nilfs *nilfs,
855 char *buf)
856{
857 struct nilfs_super_block **sbp = nilfs->ns_sbp;
858 u32 major = le32_to_cpu(sbp[0]->s_rev_level);
859 u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
860
861 return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
862}
863
864static
865ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
866 struct the_nilfs *nilfs,
867 char *buf)
868{
869 return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
870}
871
872static
873ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
874 struct the_nilfs *nilfs,
875 char *buf)
876{
877 struct nilfs_super_block **sbp = nilfs->ns_sbp;
878 u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
879
880 return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
881}
882
883static
884ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
885 struct the_nilfs *nilfs,
886 char *buf)
887{
888 sector_t free_blocks = 0;
889
890 nilfs_count_free_blocks(nilfs, &free_blocks);
891 return snprintf(buf, PAGE_SIZE, "%llu\n",
892 (unsigned long long)free_blocks);
893}
894
895static
896ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
897 struct the_nilfs *nilfs,
898 char *buf)
899{
900 struct nilfs_super_block **sbp = nilfs->ns_sbp;
901
902 return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
903}
904
905static
906ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
907 struct the_nilfs *nilfs,
908 char *buf)
909{
910 struct nilfs_super_block **sbp = nilfs->ns_sbp;
911
912 return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
913 sbp[0]->s_volume_name);
914}
915
916static const char dev_readme_str[] =
917 "The <device> group contains attributes that describe file system\n"
918 "partition's details.\n\n"
919 "(1) revision\n\tshow NILFS file system revision.\n\n"
920 "(2) blocksize\n\tshow volume block size in bytes.\n\n"
921 "(3) device_size\n\tshow volume size in bytes.\n\n"
922 "(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
923 "(5) uuid\n\tshow volume's UUID.\n\n"
924 "(6) volume_name\n\tshow volume's name.\n\n";
925
926static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
927 struct the_nilfs *nilfs,
928 char *buf)
929{
930 return snprintf(buf, PAGE_SIZE, dev_readme_str);
931}
932
933NILFS_DEV_RO_ATTR(revision);
934NILFS_DEV_RO_ATTR(blocksize);
935NILFS_DEV_RO_ATTR(device_size);
936NILFS_DEV_RO_ATTR(free_blocks);
937NILFS_DEV_RO_ATTR(uuid);
938NILFS_DEV_RO_ATTR(volume_name);
939NILFS_DEV_RO_ATTR(README);
940
941static struct attribute *nilfs_dev_attrs[] = {
942 NILFS_DEV_ATTR_LIST(revision),
943 NILFS_DEV_ATTR_LIST(blocksize),
944 NILFS_DEV_ATTR_LIST(device_size),
945 NILFS_DEV_ATTR_LIST(free_blocks),
946 NILFS_DEV_ATTR_LIST(uuid),
947 NILFS_DEV_ATTR_LIST(volume_name),
948 NILFS_DEV_ATTR_LIST(README),
949 NULL,
950};
951
952static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
953 struct attribute *attr, char *buf)
954{
955 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
956 ns_dev_kobj);
957 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
958 attr);
959
960 return a->show ? a->show(a, nilfs, buf) : 0;
961}
962
963static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
964 struct attribute *attr,
965 const char *buf, size_t len)
966{
967 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
968 ns_dev_kobj);
969 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
970 attr);
971
972 return a->store ? a->store(a, nilfs, buf, len) : 0;
973}
974
975static void nilfs_dev_attr_release(struct kobject *kobj)
976{
977 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
978 ns_dev_kobj);
979 complete(&nilfs->ns_dev_kobj_unregister);
980}
981
982static const struct sysfs_ops nilfs_dev_attr_ops = {
983 .show = nilfs_dev_attr_show,
984 .store = nilfs_dev_attr_store,
985};
986
987static struct kobj_type nilfs_dev_ktype = {
988 .default_attrs = nilfs_dev_attrs,
989 .sysfs_ops = &nilfs_dev_attr_ops,
990 .release = nilfs_dev_attr_release,
991};
992
993int nilfs_sysfs_create_device_group(struct super_block *sb)
994{
995 struct the_nilfs *nilfs = sb->s_fs_info;
996 size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
997 int err;
998
999 nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
1000 if (unlikely(!nilfs->ns_dev_subgroups)) {
1001 err = -ENOMEM;
1002 nilfs_msg(sb, KERN_ERR,
1003 "unable to allocate memory for device group");
1004 goto failed_create_device_group;
1005 }
1006
1007 nilfs->ns_dev_kobj.kset = nilfs_kset;
1008 init_completion(&nilfs->ns_dev_kobj_unregister);
1009 err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
1010 "%s", sb->s_id);
1011 if (err)
1012 goto free_dev_subgroups;
1013
1014 err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
1015 if (err)
1016 goto cleanup_dev_kobject;
1017
1018 err = nilfs_sysfs_create_checkpoints_group(nilfs);
1019 if (err)
1020 goto delete_mounted_snapshots_group;
1021
1022 err = nilfs_sysfs_create_segments_group(nilfs);
1023 if (err)
1024 goto delete_checkpoints_group;
1025
1026 err = nilfs_sysfs_create_superblock_group(nilfs);
1027 if (err)
1028 goto delete_segments_group;
1029
1030 err = nilfs_sysfs_create_segctor_group(nilfs);
1031 if (err)
1032 goto delete_superblock_group;
1033
1034 return 0;
1035
1036delete_superblock_group:
1037 nilfs_sysfs_delete_superblock_group(nilfs);
1038
1039delete_segments_group:
1040 nilfs_sysfs_delete_segments_group(nilfs);
1041
1042delete_checkpoints_group:
1043 nilfs_sysfs_delete_checkpoints_group(nilfs);
1044
1045delete_mounted_snapshots_group:
1046 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1047
1048cleanup_dev_kobject:
1049 kobject_del(&nilfs->ns_dev_kobj);
1050
1051free_dev_subgroups:
1052 kfree(nilfs->ns_dev_subgroups);
1053
1054failed_create_device_group:
1055 return err;
1056}
1057
1058void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
1059{
1060 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1061 nilfs_sysfs_delete_checkpoints_group(nilfs);
1062 nilfs_sysfs_delete_segments_group(nilfs);
1063 nilfs_sysfs_delete_superblock_group(nilfs);
1064 nilfs_sysfs_delete_segctor_group(nilfs);
1065 kobject_del(&nilfs->ns_dev_kobj);
1066 kfree(nilfs->ns_dev_subgroups);
1067}
1068
1069/************************************************************************
1070 * NILFS feature attrs *
1071 ************************************************************************/
1072
1073static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
1074 struct attribute *attr, char *buf)
1075{
1076 return snprintf(buf, PAGE_SIZE, "%d.%d\n",
1077 NILFS_CURRENT_REV, NILFS_MINOR_REV);
1078}
1079
1080static const char features_readme_str[] =
1081 "The features group contains attributes that describe NILFS file\n"
1082 "system driver features.\n\n"
1083 "(1) revision\n\tshow current revision of NILFS file system driver.\n";
1084
1085static ssize_t nilfs_feature_README_show(struct kobject *kobj,
1086 struct attribute *attr,
1087 char *buf)
1088{
1089 return snprintf(buf, PAGE_SIZE, features_readme_str);
1090}
1091
1092NILFS_FEATURE_RO_ATTR(revision);
1093NILFS_FEATURE_RO_ATTR(README);
1094
1095static struct attribute *nilfs_feature_attrs[] = {
1096 NILFS_FEATURE_ATTR_LIST(revision),
1097 NILFS_FEATURE_ATTR_LIST(README),
1098 NULL,
1099};
1100
1101static const struct attribute_group nilfs_feature_attr_group = {
1102 .name = "features",
1103 .attrs = nilfs_feature_attrs,
1104};
1105
1106int __init nilfs_sysfs_init(void)
1107{
1108 int err;
1109
1110 nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
1111 if (!nilfs_kset) {
1112 err = -ENOMEM;
1113 nilfs_msg(NULL, KERN_ERR,
1114 "unable to create sysfs entry: err=%d", err);
1115 goto failed_sysfs_init;
1116 }
1117
1118 err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1119 if (unlikely(err)) {
1120 nilfs_msg(NULL, KERN_ERR,
1121 "unable to create feature group: err=%d", err);
1122 goto cleanup_sysfs_init;
1123 }
1124
1125 return 0;
1126
1127cleanup_sysfs_init:
1128 kset_unregister(nilfs_kset);
1129
1130failed_sysfs_init:
1131 return err;
1132}
1133
1134void nilfs_sysfs_exit(void)
1135{
1136 sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1137 kset_unregister(nilfs_kset);
1138}
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_DEV_INT_GROUP_OPS(name, parent_name) \
23static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
24 struct attribute *attr, char *buf) \
25{ \
26 struct the_nilfs *nilfs = container_of(kobj->parent, \
27 struct the_nilfs, \
28 ns_##parent_name##_kobj); \
29 struct nilfs_##name##_attr *a = container_of(attr, \
30 struct nilfs_##name##_attr, \
31 attr); \
32 return a->show ? a->show(a, nilfs, buf) : 0; \
33} \
34static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
35 struct attribute *attr, \
36 const char *buf, size_t len) \
37{ \
38 struct the_nilfs *nilfs = container_of(kobj->parent, \
39 struct the_nilfs, \
40 ns_##parent_name##_kobj); \
41 struct nilfs_##name##_attr *a = container_of(attr, \
42 struct nilfs_##name##_attr, \
43 attr); \
44 return a->store ? a->store(a, nilfs, buf, len) : 0; \
45} \
46static const struct sysfs_ops nilfs_##name##_attr_ops = { \
47 .show = nilfs_##name##_attr_show, \
48 .store = nilfs_##name##_attr_store, \
49}
50
51#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
52static void nilfs_##name##_attr_release(struct kobject *kobj) \
53{ \
54 struct nilfs_sysfs_##parent_name##_subgroups *subgroups = container_of(kobj, \
55 struct nilfs_sysfs_##parent_name##_subgroups, \
56 sg_##name##_kobj); \
57 complete(&subgroups->sg_##name##_kobj_unregister); \
58} \
59static struct kobj_type nilfs_##name##_ktype = { \
60 .default_attrs = nilfs_##name##_attrs, \
61 .sysfs_ops = &nilfs_##name##_attr_ops, \
62 .release = nilfs_##name##_attr_release, \
63}
64
65#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
66static int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
67{ \
68 struct kobject *parent; \
69 struct kobject *kobj; \
70 struct completion *kobj_unregister; \
71 struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
72 int err; \
73 subgroups = nilfs->ns_##parent_name##_subgroups; \
74 kobj = &subgroups->sg_##name##_kobj; \
75 kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
76 parent = &nilfs->ns_##parent_name##_kobj; \
77 kobj->kset = nilfs_kset; \
78 init_completion(kobj_unregister); \
79 err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
80 #name); \
81 if (err) \
82 kobject_put(kobj); \
83 return err; \
84} \
85static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
86{ \
87 kobject_put(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
88}
89
90/************************************************************************
91 * NILFS snapshot attrs *
92 ************************************************************************/
93
94static ssize_t
95nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
96 struct nilfs_root *root, char *buf)
97{
98 return snprintf(buf, PAGE_SIZE, "%llu\n",
99 (unsigned long long)atomic64_read(&root->inodes_count));
100}
101
102static ssize_t
103nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
104 struct nilfs_root *root, char *buf)
105{
106 return snprintf(buf, PAGE_SIZE, "%llu\n",
107 (unsigned long long)atomic64_read(&root->blocks_count));
108}
109
110static const char snapshot_readme_str[] =
111 "The group contains details about mounted snapshot.\n\n"
112 "(1) inodes_count\n\tshow number of inodes for snapshot.\n\n"
113 "(2) blocks_count\n\tshow number of blocks for snapshot.\n\n";
114
115static ssize_t
116nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
117 struct nilfs_root *root, char *buf)
118{
119 return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
120}
121
122NILFS_SNAPSHOT_RO_ATTR(inodes_count);
123NILFS_SNAPSHOT_RO_ATTR(blocks_count);
124NILFS_SNAPSHOT_RO_ATTR(README);
125
126static struct attribute *nilfs_snapshot_attrs[] = {
127 NILFS_SNAPSHOT_ATTR_LIST(inodes_count),
128 NILFS_SNAPSHOT_ATTR_LIST(blocks_count),
129 NILFS_SNAPSHOT_ATTR_LIST(README),
130 NULL,
131};
132
133static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
134 struct attribute *attr, char *buf)
135{
136 struct nilfs_root *root =
137 container_of(kobj, struct nilfs_root, snapshot_kobj);
138 struct nilfs_snapshot_attr *a =
139 container_of(attr, struct nilfs_snapshot_attr, attr);
140
141 return a->show ? a->show(a, root, buf) : 0;
142}
143
144static ssize_t nilfs_snapshot_attr_store(struct kobject *kobj,
145 struct attribute *attr,
146 const char *buf, size_t len)
147{
148 struct nilfs_root *root =
149 container_of(kobj, struct nilfs_root, snapshot_kobj);
150 struct nilfs_snapshot_attr *a =
151 container_of(attr, struct nilfs_snapshot_attr, attr);
152
153 return a->store ? a->store(a, root, buf, len) : 0;
154}
155
156static void nilfs_snapshot_attr_release(struct kobject *kobj)
157{
158 struct nilfs_root *root = container_of(kobj, struct nilfs_root,
159 snapshot_kobj);
160 complete(&root->snapshot_kobj_unregister);
161}
162
163static const struct sysfs_ops nilfs_snapshot_attr_ops = {
164 .show = nilfs_snapshot_attr_show,
165 .store = nilfs_snapshot_attr_store,
166};
167
168static struct kobj_type nilfs_snapshot_ktype = {
169 .default_attrs = nilfs_snapshot_attrs,
170 .sysfs_ops = &nilfs_snapshot_attr_ops,
171 .release = nilfs_snapshot_attr_release,
172};
173
174int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
175{
176 struct the_nilfs *nilfs;
177 struct kobject *parent;
178 int err;
179
180 nilfs = root->nilfs;
181 parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj;
182 root->snapshot_kobj.kset = nilfs_kset;
183 init_completion(&root->snapshot_kobj_unregister);
184
185 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
186 err = kobject_init_and_add(&root->snapshot_kobj,
187 &nilfs_snapshot_ktype,
188 &nilfs->ns_dev_kobj,
189 "current_checkpoint");
190 } else {
191 err = kobject_init_and_add(&root->snapshot_kobj,
192 &nilfs_snapshot_ktype,
193 parent,
194 "%llu", root->cno);
195 }
196
197 if (err)
198 kobject_put(&root->snapshot_kobj);
199
200 return err;
201}
202
203void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
204{
205 kobject_put(&root->snapshot_kobj);
206}
207
208/************************************************************************
209 * NILFS mounted snapshots attrs *
210 ************************************************************************/
211
212static const char mounted_snapshots_readme_str[] =
213 "The mounted_snapshots group contains group for\n"
214 "every mounted snapshot.\n";
215
216static ssize_t
217nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
218 struct the_nilfs *nilfs, char *buf)
219{
220 return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
221}
222
223NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
224
225static struct attribute *nilfs_mounted_snapshots_attrs[] = {
226 NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
227 NULL,
228};
229
230NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
231NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
232NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
233
234/************************************************************************
235 * NILFS checkpoints attrs *
236 ************************************************************************/
237
238static ssize_t
239nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
240 struct the_nilfs *nilfs,
241 char *buf)
242{
243 __u64 ncheckpoints;
244 struct nilfs_cpstat cpstat;
245 int err;
246
247 down_read(&nilfs->ns_segctor_sem);
248 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
249 up_read(&nilfs->ns_segctor_sem);
250 if (err < 0) {
251 nilfs_err(nilfs->ns_sb, "unable to get checkpoint stat: err=%d",
252 err);
253 return err;
254 }
255
256 ncheckpoints = cpstat.cs_ncps;
257
258 return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
259}
260
261static ssize_t
262nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
263 struct the_nilfs *nilfs,
264 char *buf)
265{
266 __u64 nsnapshots;
267 struct nilfs_cpstat cpstat;
268 int err;
269
270 down_read(&nilfs->ns_segctor_sem);
271 err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
272 up_read(&nilfs->ns_segctor_sem);
273 if (err < 0) {
274 nilfs_err(nilfs->ns_sb, "unable to get checkpoint stat: err=%d",
275 err);
276 return err;
277 }
278
279 nsnapshots = cpstat.cs_nsss;
280
281 return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
282}
283
284static ssize_t
285nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
286 struct the_nilfs *nilfs,
287 char *buf)
288{
289 __u64 last_cno;
290
291 spin_lock(&nilfs->ns_last_segment_lock);
292 last_cno = nilfs->ns_last_cno;
293 spin_unlock(&nilfs->ns_last_segment_lock);
294
295 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
296}
297
298static ssize_t
299nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
300 struct the_nilfs *nilfs,
301 char *buf)
302{
303 __u64 cno;
304
305 down_read(&nilfs->ns_segctor_sem);
306 cno = nilfs->ns_cno;
307 up_read(&nilfs->ns_segctor_sem);
308
309 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
310}
311
312static const char checkpoints_readme_str[] =
313 "The checkpoints group contains attributes that describe\n"
314 "details about volume's checkpoints.\n\n"
315 "(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n"
316 "(2) snapshots_number\n\tshow number of snapshots on volume.\n\n"
317 "(3) last_seg_checkpoint\n"
318 "\tshow checkpoint number of the latest segment.\n\n"
319 "(4) next_checkpoint\n\tshow next checkpoint number.\n\n";
320
321static ssize_t
322nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
323 struct the_nilfs *nilfs, char *buf)
324{
325 return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
326}
327
328NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
329NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
330NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
331NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
332NILFS_CHECKPOINTS_RO_ATTR(README);
333
334static struct attribute *nilfs_checkpoints_attrs[] = {
335 NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number),
336 NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number),
337 NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint),
338 NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint),
339 NILFS_CHECKPOINTS_ATTR_LIST(README),
340 NULL,
341};
342
343NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
344NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
345NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
346
347/************************************************************************
348 * NILFS segments attrs *
349 ************************************************************************/
350
351static ssize_t
352nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
353 struct the_nilfs *nilfs,
354 char *buf)
355{
356 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
357}
358
359static ssize_t
360nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
361 struct the_nilfs *nilfs,
362 char *buf)
363{
364 return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
365}
366
367static ssize_t
368nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
369 struct the_nilfs *nilfs,
370 char *buf)
371{
372 unsigned long ncleansegs;
373
374 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
375 ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
376 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
377
378 return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
379}
380
381static ssize_t
382nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
383 struct the_nilfs *nilfs,
384 char *buf)
385{
386 struct nilfs_sustat sustat;
387 int err;
388
389 down_read(&nilfs->ns_segctor_sem);
390 err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
391 up_read(&nilfs->ns_segctor_sem);
392 if (err < 0) {
393 nilfs_err(nilfs->ns_sb, "unable to get segment stat: err=%d",
394 err);
395 return err;
396 }
397
398 return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
399}
400
401static const char segments_readme_str[] =
402 "The segments group contains attributes that describe\n"
403 "details about volume's segments.\n\n"
404 "(1) segments_number\n\tshow number of segments on volume.\n\n"
405 "(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"
406 "(3) clean_segments\n\tshow count of clean segments.\n\n"
407 "(4) dirty_segments\n\tshow count of dirty segments.\n\n";
408
409static ssize_t
410nilfs_segments_README_show(struct nilfs_segments_attr *attr,
411 struct the_nilfs *nilfs,
412 char *buf)
413{
414 return snprintf(buf, PAGE_SIZE, segments_readme_str);
415}
416
417NILFS_SEGMENTS_RO_ATTR(segments_number);
418NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
419NILFS_SEGMENTS_RO_ATTR(clean_segments);
420NILFS_SEGMENTS_RO_ATTR(dirty_segments);
421NILFS_SEGMENTS_RO_ATTR(README);
422
423static struct attribute *nilfs_segments_attrs[] = {
424 NILFS_SEGMENTS_ATTR_LIST(segments_number),
425 NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),
426 NILFS_SEGMENTS_ATTR_LIST(clean_segments),
427 NILFS_SEGMENTS_ATTR_LIST(dirty_segments),
428 NILFS_SEGMENTS_ATTR_LIST(README),
429 NULL,
430};
431
432NILFS_DEV_INT_GROUP_OPS(segments, dev);
433NILFS_DEV_INT_GROUP_TYPE(segments, dev);
434NILFS_DEV_INT_GROUP_FNS(segments, dev);
435
436/************************************************************************
437 * NILFS segctor attrs *
438 ************************************************************************/
439
440static ssize_t
441nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
442 struct the_nilfs *nilfs,
443 char *buf)
444{
445 sector_t last_pseg;
446
447 spin_lock(&nilfs->ns_last_segment_lock);
448 last_pseg = nilfs->ns_last_pseg;
449 spin_unlock(&nilfs->ns_last_segment_lock);
450
451 return snprintf(buf, PAGE_SIZE, "%llu\n",
452 (unsigned long long)last_pseg);
453}
454
455static ssize_t
456nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
457 struct the_nilfs *nilfs,
458 char *buf)
459{
460 u64 last_seq;
461
462 spin_lock(&nilfs->ns_last_segment_lock);
463 last_seq = nilfs->ns_last_seq;
464 spin_unlock(&nilfs->ns_last_segment_lock);
465
466 return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
467}
468
469static ssize_t
470nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_attr *attr,
471 struct the_nilfs *nilfs,
472 char *buf)
473{
474 __u64 last_cno;
475
476 spin_lock(&nilfs->ns_last_segment_lock);
477 last_cno = nilfs->ns_last_cno;
478 spin_unlock(&nilfs->ns_last_segment_lock);
479
480 return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
481}
482
483static ssize_t
484nilfs_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
485 struct the_nilfs *nilfs,
486 char *buf)
487{
488 u64 seg_seq;
489
490 down_read(&nilfs->ns_segctor_sem);
491 seg_seq = nilfs->ns_seg_seq;
492 up_read(&nilfs->ns_segctor_sem);
493
494 return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
495}
496
497static ssize_t
498nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
499 struct the_nilfs *nilfs,
500 char *buf)
501{
502 __u64 segnum;
503
504 down_read(&nilfs->ns_segctor_sem);
505 segnum = nilfs->ns_segnum;
506 up_read(&nilfs->ns_segctor_sem);
507
508 return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
509}
510
511static ssize_t
512nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
513 struct the_nilfs *nilfs,
514 char *buf)
515{
516 __u64 nextnum;
517
518 down_read(&nilfs->ns_segctor_sem);
519 nextnum = nilfs->ns_nextnum;
520 up_read(&nilfs->ns_segctor_sem);
521
522 return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
523}
524
525static ssize_t
526nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
527 struct the_nilfs *nilfs,
528 char *buf)
529{
530 unsigned long pseg_offset;
531
532 down_read(&nilfs->ns_segctor_sem);
533 pseg_offset = nilfs->ns_pseg_offset;
534 up_read(&nilfs->ns_segctor_sem);
535
536 return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
537}
538
539static ssize_t
540nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_attr *attr,
541 struct the_nilfs *nilfs,
542 char *buf)
543{
544 __u64 cno;
545
546 down_read(&nilfs->ns_segctor_sem);
547 cno = nilfs->ns_cno;
548 up_read(&nilfs->ns_segctor_sem);
549
550 return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
551}
552
553static ssize_t
554nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
555 struct the_nilfs *nilfs,
556 char *buf)
557{
558 time64_t ctime;
559
560 down_read(&nilfs->ns_segctor_sem);
561 ctime = nilfs->ns_ctime;
562 up_read(&nilfs->ns_segctor_sem);
563
564 return sysfs_emit(buf, "%ptTs\n", &ctime);
565}
566
567static ssize_t
568nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
569 struct the_nilfs *nilfs,
570 char *buf)
571{
572 time64_t ctime;
573
574 down_read(&nilfs->ns_segctor_sem);
575 ctime = nilfs->ns_ctime;
576 up_read(&nilfs->ns_segctor_sem);
577
578 return snprintf(buf, PAGE_SIZE, "%llu\n", ctime);
579}
580
581static ssize_t
582nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
583 struct the_nilfs *nilfs,
584 char *buf)
585{
586 time64_t nongc_ctime;
587
588 down_read(&nilfs->ns_segctor_sem);
589 nongc_ctime = nilfs->ns_nongc_ctime;
590 up_read(&nilfs->ns_segctor_sem);
591
592 return sysfs_emit(buf, "%ptTs\n", &nongc_ctime);
593}
594
595static ssize_t
596nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
597 struct the_nilfs *nilfs,
598 char *buf)
599{
600 time64_t nongc_ctime;
601
602 down_read(&nilfs->ns_segctor_sem);
603 nongc_ctime = nilfs->ns_nongc_ctime;
604 up_read(&nilfs->ns_segctor_sem);
605
606 return snprintf(buf, PAGE_SIZE, "%llu\n", nongc_ctime);
607}
608
609static ssize_t
610nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
611 struct the_nilfs *nilfs,
612 char *buf)
613{
614 u32 ndirtyblks;
615
616 down_read(&nilfs->ns_segctor_sem);
617 ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
618 up_read(&nilfs->ns_segctor_sem);
619
620 return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
621}
622
623static const char segctor_readme_str[] =
624 "The segctor group contains attributes that describe\n"
625 "segctor thread activity details.\n\n"
626 "(1) last_pseg_block\n"
627 "\tshow start block number of the latest segment.\n\n"
628 "(2) last_seg_sequence\n"
629 "\tshow sequence value of the latest segment.\n\n"
630 "(3) last_seg_checkpoint\n"
631 "\tshow checkpoint number of the latest segment.\n\n"
632 "(4) current_seg_sequence\n\tshow segment sequence counter.\n\n"
633 "(5) current_last_full_seg\n"
634 "\tshow index number of the latest full segment.\n\n"
635 "(6) next_full_seg\n"
636 "\tshow index number of the full segment index to be used next.\n\n"
637 "(7) next_pseg_offset\n"
638 "\tshow offset of next partial segment in the current full segment.\n\n"
639 "(8) next_checkpoint\n\tshow next checkpoint number.\n\n"
640 "(9) last_seg_write_time\n"
641 "\tshow write time of the last segment in human-readable format.\n\n"
642 "(10) last_seg_write_time_secs\n"
643 "\tshow write time of the last segment in seconds.\n\n"
644 "(11) last_nongc_write_time\n"
645 "\tshow write time of the last segment not for cleaner operation "
646 "in human-readable format.\n\n"
647 "(12) last_nongc_write_time_secs\n"
648 "\tshow write time of the last segment not for cleaner operation "
649 "in seconds.\n\n"
650 "(13) dirty_data_blocks_count\n"
651 "\tshow number of dirty data blocks.\n\n";
652
653static ssize_t
654nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
655 struct the_nilfs *nilfs, char *buf)
656{
657 return snprintf(buf, PAGE_SIZE, segctor_readme_str);
658}
659
660NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
661NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
662NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
663NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
664NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
665NILFS_SEGCTOR_RO_ATTR(next_full_seg);
666NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
667NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
668NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
669NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
670NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
671NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
672NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
673NILFS_SEGCTOR_RO_ATTR(README);
674
675static struct attribute *nilfs_segctor_attrs[] = {
676 NILFS_SEGCTOR_ATTR_LIST(last_pseg_block),
677 NILFS_SEGCTOR_ATTR_LIST(last_seg_sequence),
678 NILFS_SEGCTOR_ATTR_LIST(last_seg_checkpoint),
679 NILFS_SEGCTOR_ATTR_LIST(current_seg_sequence),
680 NILFS_SEGCTOR_ATTR_LIST(current_last_full_seg),
681 NILFS_SEGCTOR_ATTR_LIST(next_full_seg),
682 NILFS_SEGCTOR_ATTR_LIST(next_pseg_offset),
683 NILFS_SEGCTOR_ATTR_LIST(next_checkpoint),
684 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time),
685 NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time_secs),
686 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time),
687 NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time_secs),
688 NILFS_SEGCTOR_ATTR_LIST(dirty_data_blocks_count),
689 NILFS_SEGCTOR_ATTR_LIST(README),
690 NULL,
691};
692
693NILFS_DEV_INT_GROUP_OPS(segctor, dev);
694NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
695NILFS_DEV_INT_GROUP_FNS(segctor, dev);
696
697/************************************************************************
698 * NILFS superblock attrs *
699 ************************************************************************/
700
701static ssize_t
702nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
703 struct the_nilfs *nilfs,
704 char *buf)
705{
706 time64_t sbwtime;
707
708 down_read(&nilfs->ns_sem);
709 sbwtime = nilfs->ns_sbwtime;
710 up_read(&nilfs->ns_sem);
711
712 return sysfs_emit(buf, "%ptTs\n", &sbwtime);
713}
714
715static ssize_t
716nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
717 struct the_nilfs *nilfs,
718 char *buf)
719{
720 time64_t sbwtime;
721
722 down_read(&nilfs->ns_sem);
723 sbwtime = nilfs->ns_sbwtime;
724 up_read(&nilfs->ns_sem);
725
726 return snprintf(buf, PAGE_SIZE, "%llu\n", sbwtime);
727}
728
729static ssize_t
730nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
731 struct the_nilfs *nilfs,
732 char *buf)
733{
734 unsigned int sbwcount;
735
736 down_read(&nilfs->ns_sem);
737 sbwcount = nilfs->ns_sbwcount;
738 up_read(&nilfs->ns_sem);
739
740 return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
741}
742
743static ssize_t
744nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
745 struct the_nilfs *nilfs,
746 char *buf)
747{
748 unsigned int sb_update_freq;
749
750 down_read(&nilfs->ns_sem);
751 sb_update_freq = nilfs->ns_sb_update_freq;
752 up_read(&nilfs->ns_sem);
753
754 return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
755}
756
757static ssize_t
758nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
759 struct the_nilfs *nilfs,
760 const char *buf, size_t count)
761{
762 unsigned int val;
763 int err;
764
765 err = kstrtouint(skip_spaces(buf), 0, &val);
766 if (err) {
767 nilfs_err(nilfs->ns_sb, "unable to convert string: err=%d",
768 err);
769 return err;
770 }
771
772 if (val < NILFS_SB_FREQ) {
773 val = NILFS_SB_FREQ;
774 nilfs_warn(nilfs->ns_sb,
775 "superblock update frequency cannot be lesser than 10 seconds");
776 }
777
778 down_write(&nilfs->ns_sem);
779 nilfs->ns_sb_update_freq = val;
780 up_write(&nilfs->ns_sem);
781
782 return count;
783}
784
785static const char sb_readme_str[] =
786 "The superblock group contains attributes that describe\n"
787 "superblock's details.\n\n"
788 "(1) sb_write_time\n\tshow previous write time of super block "
789 "in human-readable format.\n\n"
790 "(2) sb_write_time_secs\n\tshow previous write time of super block "
791 "in seconds.\n\n"
792 "(3) sb_write_count\n\tshow write count of super block.\n\n"
793 "(4) sb_update_frequency\n"
794 "\tshow/set interval of periodical update of superblock (in seconds).\n\n"
795 "\tYou can set preferable frequency of superblock update by command:\n\n"
796 "\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
797
798static ssize_t
799nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
800 struct the_nilfs *nilfs, char *buf)
801{
802 return snprintf(buf, PAGE_SIZE, sb_readme_str);
803}
804
805NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
806NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
807NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
808NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
809NILFS_SUPERBLOCK_RO_ATTR(README);
810
811static struct attribute *nilfs_superblock_attrs[] = {
812 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
813 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
814 NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
815 NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
816 NILFS_SUPERBLOCK_ATTR_LIST(README),
817 NULL,
818};
819
820NILFS_DEV_INT_GROUP_OPS(superblock, dev);
821NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
822NILFS_DEV_INT_GROUP_FNS(superblock, dev);
823
824/************************************************************************
825 * NILFS device attrs *
826 ************************************************************************/
827
828static
829ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
830 struct the_nilfs *nilfs,
831 char *buf)
832{
833 struct nilfs_super_block **sbp = nilfs->ns_sbp;
834 u32 major = le32_to_cpu(sbp[0]->s_rev_level);
835 u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
836
837 return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
838}
839
840static
841ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
842 struct the_nilfs *nilfs,
843 char *buf)
844{
845 return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
846}
847
848static
849ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
850 struct the_nilfs *nilfs,
851 char *buf)
852{
853 struct nilfs_super_block **sbp = nilfs->ns_sbp;
854 u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
855
856 return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
857}
858
859static
860ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
861 struct the_nilfs *nilfs,
862 char *buf)
863{
864 sector_t free_blocks = 0;
865
866 nilfs_count_free_blocks(nilfs, &free_blocks);
867 return snprintf(buf, PAGE_SIZE, "%llu\n",
868 (unsigned long long)free_blocks);
869}
870
871static
872ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
873 struct the_nilfs *nilfs,
874 char *buf)
875{
876 struct nilfs_super_block **sbp = nilfs->ns_sbp;
877
878 return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
879}
880
881static
882ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
883 struct the_nilfs *nilfs,
884 char *buf)
885{
886 struct nilfs_super_block **sbp = nilfs->ns_sbp;
887
888 return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
889 sbp[0]->s_volume_name);
890}
891
892static const char dev_readme_str[] =
893 "The <device> group contains attributes that describe file system\n"
894 "partition's details.\n\n"
895 "(1) revision\n\tshow NILFS file system revision.\n\n"
896 "(2) blocksize\n\tshow volume block size in bytes.\n\n"
897 "(3) device_size\n\tshow volume size in bytes.\n\n"
898 "(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
899 "(5) uuid\n\tshow volume's UUID.\n\n"
900 "(6) volume_name\n\tshow volume's name.\n\n";
901
902static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
903 struct the_nilfs *nilfs,
904 char *buf)
905{
906 return snprintf(buf, PAGE_SIZE, dev_readme_str);
907}
908
909NILFS_DEV_RO_ATTR(revision);
910NILFS_DEV_RO_ATTR(blocksize);
911NILFS_DEV_RO_ATTR(device_size);
912NILFS_DEV_RO_ATTR(free_blocks);
913NILFS_DEV_RO_ATTR(uuid);
914NILFS_DEV_RO_ATTR(volume_name);
915NILFS_DEV_RO_ATTR(README);
916
917static struct attribute *nilfs_dev_attrs[] = {
918 NILFS_DEV_ATTR_LIST(revision),
919 NILFS_DEV_ATTR_LIST(blocksize),
920 NILFS_DEV_ATTR_LIST(device_size),
921 NILFS_DEV_ATTR_LIST(free_blocks),
922 NILFS_DEV_ATTR_LIST(uuid),
923 NILFS_DEV_ATTR_LIST(volume_name),
924 NILFS_DEV_ATTR_LIST(README),
925 NULL,
926};
927
928static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
929 struct attribute *attr, char *buf)
930{
931 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
932 ns_dev_kobj);
933 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
934 attr);
935
936 return a->show ? a->show(a, nilfs, buf) : 0;
937}
938
939static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
940 struct attribute *attr,
941 const char *buf, size_t len)
942{
943 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
944 ns_dev_kobj);
945 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
946 attr);
947
948 return a->store ? a->store(a, nilfs, buf, len) : 0;
949}
950
951static void nilfs_dev_attr_release(struct kobject *kobj)
952{
953 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
954 ns_dev_kobj);
955 complete(&nilfs->ns_dev_kobj_unregister);
956}
957
958static const struct sysfs_ops nilfs_dev_attr_ops = {
959 .show = nilfs_dev_attr_show,
960 .store = nilfs_dev_attr_store,
961};
962
963static struct kobj_type nilfs_dev_ktype = {
964 .default_attrs = nilfs_dev_attrs,
965 .sysfs_ops = &nilfs_dev_attr_ops,
966 .release = nilfs_dev_attr_release,
967};
968
969int nilfs_sysfs_create_device_group(struct super_block *sb)
970{
971 struct the_nilfs *nilfs = sb->s_fs_info;
972 size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
973 int err;
974
975 nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
976 if (unlikely(!nilfs->ns_dev_subgroups)) {
977 err = -ENOMEM;
978 nilfs_err(sb, "unable to allocate memory for device group");
979 goto failed_create_device_group;
980 }
981
982 nilfs->ns_dev_kobj.kset = nilfs_kset;
983 init_completion(&nilfs->ns_dev_kobj_unregister);
984 err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
985 "%s", sb->s_id);
986 if (err)
987 goto cleanup_dev_kobject;
988
989 err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
990 if (err)
991 goto cleanup_dev_kobject;
992
993 err = nilfs_sysfs_create_checkpoints_group(nilfs);
994 if (err)
995 goto delete_mounted_snapshots_group;
996
997 err = nilfs_sysfs_create_segments_group(nilfs);
998 if (err)
999 goto delete_checkpoints_group;
1000
1001 err = nilfs_sysfs_create_superblock_group(nilfs);
1002 if (err)
1003 goto delete_segments_group;
1004
1005 err = nilfs_sysfs_create_segctor_group(nilfs);
1006 if (err)
1007 goto delete_superblock_group;
1008
1009 return 0;
1010
1011delete_superblock_group:
1012 nilfs_sysfs_delete_superblock_group(nilfs);
1013
1014delete_segments_group:
1015 nilfs_sysfs_delete_segments_group(nilfs);
1016
1017delete_checkpoints_group:
1018 nilfs_sysfs_delete_checkpoints_group(nilfs);
1019
1020delete_mounted_snapshots_group:
1021 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1022
1023cleanup_dev_kobject:
1024 kobject_put(&nilfs->ns_dev_kobj);
1025 kfree(nilfs->ns_dev_subgroups);
1026
1027failed_create_device_group:
1028 return err;
1029}
1030
1031void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
1032{
1033 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1034 nilfs_sysfs_delete_checkpoints_group(nilfs);
1035 nilfs_sysfs_delete_segments_group(nilfs);
1036 nilfs_sysfs_delete_superblock_group(nilfs);
1037 nilfs_sysfs_delete_segctor_group(nilfs);
1038 kobject_del(&nilfs->ns_dev_kobj);
1039 kobject_put(&nilfs->ns_dev_kobj);
1040 kfree(nilfs->ns_dev_subgroups);
1041}
1042
1043/************************************************************************
1044 * NILFS feature attrs *
1045 ************************************************************************/
1046
1047static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
1048 struct attribute *attr, char *buf)
1049{
1050 return snprintf(buf, PAGE_SIZE, "%d.%d\n",
1051 NILFS_CURRENT_REV, NILFS_MINOR_REV);
1052}
1053
1054static const char features_readme_str[] =
1055 "The features group contains attributes that describe NILFS file\n"
1056 "system driver features.\n\n"
1057 "(1) revision\n\tshow current revision of NILFS file system driver.\n";
1058
1059static ssize_t nilfs_feature_README_show(struct kobject *kobj,
1060 struct attribute *attr,
1061 char *buf)
1062{
1063 return snprintf(buf, PAGE_SIZE, features_readme_str);
1064}
1065
1066NILFS_FEATURE_RO_ATTR(revision);
1067NILFS_FEATURE_RO_ATTR(README);
1068
1069static struct attribute *nilfs_feature_attrs[] = {
1070 NILFS_FEATURE_ATTR_LIST(revision),
1071 NILFS_FEATURE_ATTR_LIST(README),
1072 NULL,
1073};
1074
1075static const struct attribute_group nilfs_feature_attr_group = {
1076 .name = "features",
1077 .attrs = nilfs_feature_attrs,
1078};
1079
1080int __init nilfs_sysfs_init(void)
1081{
1082 int err;
1083
1084 nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
1085 if (!nilfs_kset) {
1086 err = -ENOMEM;
1087 nilfs_err(NULL, "unable to create sysfs entry: err=%d", err);
1088 goto failed_sysfs_init;
1089 }
1090
1091 err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1092 if (unlikely(err)) {
1093 nilfs_err(NULL, "unable to create feature group: err=%d", err);
1094 goto cleanup_sysfs_init;
1095 }
1096
1097 return 0;
1098
1099cleanup_sysfs_init:
1100 kset_unregister(nilfs_kset);
1101
1102failed_sysfs_init:
1103 return err;
1104}
1105
1106void nilfs_sysfs_exit(void)
1107{
1108 sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1109 kset_unregister(nilfs_kset);
1110}