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