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>/ */
20 static struct kset *nilfs_kset;
21
22 #define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
23 static 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 } \
34 static 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 } \
46 static 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) \
52 static 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 } \
59 static const 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) \
66 static 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 } \
85 static 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
94 static ssize_t
95 nilfs_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
102 static ssize_t
103 nilfs_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
110 static 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
115 static ssize_t
116 nilfs_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
122 NILFS_SNAPSHOT_RO_ATTR(inodes_count);
123 NILFS_SNAPSHOT_RO_ATTR(blocks_count);
124 NILFS_SNAPSHOT_RO_ATTR(README);
125
126 static 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 ATTRIBUTE_GROUPS(nilfs_snapshot);
133
134 static 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
145 static 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
157 static 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
164 static const struct sysfs_ops nilfs_snapshot_attr_ops = {
165 .show = nilfs_snapshot_attr_show,
166 .store = nilfs_snapshot_attr_store,
167 };
168
169 static const 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
175 int 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
204 void 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
213 static const char mounted_snapshots_readme_str[] =
214 "The mounted_snapshots group contains group for\n"
215 "every mounted snapshot.\n";
216
217 static ssize_t
218 nilfs_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
224 NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
225
226 static struct attribute *nilfs_mounted_snapshots_attrs[] = {
227 NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
228 NULL,
229 };
230 ATTRIBUTE_GROUPS(nilfs_mounted_snapshots);
231
232 NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
233 NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
234 NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
235
236 /************************************************************************
237 * NILFS checkpoints attrs *
238 ************************************************************************/
239
240 static ssize_t
241 nilfs_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
263 static ssize_t
264 nilfs_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
286 static ssize_t
287 nilfs_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
300 static ssize_t
301 nilfs_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
314 static 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
323 static ssize_t
324 nilfs_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
330 NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
331 NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
332 NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
333 NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
334 NILFS_CHECKPOINTS_RO_ATTR(README);
335
336 static 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 };
344 ATTRIBUTE_GROUPS(nilfs_checkpoints);
345
346 NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
347 NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
348 NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
349
350 /************************************************************************
351 * NILFS segments attrs *
352 ************************************************************************/
353
354 static ssize_t
355 nilfs_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
362 static ssize_t
363 nilfs_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
370 static ssize_t
371 nilfs_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
384 static ssize_t
385 nilfs_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
404 static 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
412 static ssize_t
413 nilfs_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
420 NILFS_SEGMENTS_RO_ATTR(segments_number);
421 NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
422 NILFS_SEGMENTS_RO_ATTR(clean_segments);
423 NILFS_SEGMENTS_RO_ATTR(dirty_segments);
424 NILFS_SEGMENTS_RO_ATTR(README);
425
426 static 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 };
434 ATTRIBUTE_GROUPS(nilfs_segments);
435
436 NILFS_DEV_INT_GROUP_OPS(segments, dev);
437 NILFS_DEV_INT_GROUP_TYPE(segments, dev);
438 NILFS_DEV_INT_GROUP_FNS(segments, dev);
439
440 /************************************************************************
441 * NILFS segctor attrs *
442 ************************************************************************/
443
444 static ssize_t
445 nilfs_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
459 static ssize_t
460 nilfs_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
473 static ssize_t
474 nilfs_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
487 static ssize_t
488 nilfs_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
501 static ssize_t
502 nilfs_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
515 static ssize_t
516 nilfs_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
529 static ssize_t
530 nilfs_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
543 static ssize_t
544 nilfs_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
557 static ssize_t
558 nilfs_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
571 static ssize_t
572 nilfs_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
585 static ssize_t
586 nilfs_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
599 static ssize_t
600 nilfs_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
613 static ssize_t
614 nilfs_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
627 static 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
657 static ssize_t
658 nilfs_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
664 NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
665 NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
666 NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
667 NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
668 NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
669 NILFS_SEGCTOR_RO_ATTR(next_full_seg);
670 NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
671 NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
672 NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
673 NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
674 NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
675 NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
676 NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
677 NILFS_SEGCTOR_RO_ATTR(README);
678
679 static 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 };
696 ATTRIBUTE_GROUPS(nilfs_segctor);
697
698 NILFS_DEV_INT_GROUP_OPS(segctor, dev);
699 NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
700 NILFS_DEV_INT_GROUP_FNS(segctor, dev);
701
702 /************************************************************************
703 * NILFS superblock attrs *
704 ************************************************************************/
705
706 static ssize_t
707 nilfs_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
720 static ssize_t
721 nilfs_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
734 static ssize_t
735 nilfs_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
748 static ssize_t
749 nilfs_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
762 static ssize_t
763 nilfs_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
790 static 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
803 static ssize_t
804 nilfs_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
810 NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
811 NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
812 NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
813 NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
814 NILFS_SUPERBLOCK_RO_ATTR(README);
815
816 static 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 };
824 ATTRIBUTE_GROUPS(nilfs_superblock);
825
826 NILFS_DEV_INT_GROUP_OPS(superblock, dev);
827 NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
828 NILFS_DEV_INT_GROUP_FNS(superblock, dev);
829
830 /************************************************************************
831 * NILFS device attrs *
832 ************************************************************************/
833
834 static
835 ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
836 struct the_nilfs *nilfs,
837 char *buf)
838 {
839 struct nilfs_super_block *raw_sb;
840 u32 major;
841 u16 minor;
842
843 down_read(&nilfs->ns_sem);
844 raw_sb = nilfs->ns_sbp[0];
845 major = le32_to_cpu(raw_sb->s_rev_level);
846 minor = le16_to_cpu(raw_sb->s_minor_rev_level);
847 up_read(&nilfs->ns_sem);
848
849 return sysfs_emit(buf, "%d.%d\n", major, minor);
850 }
851
852 static
853 ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
854 struct the_nilfs *nilfs,
855 char *buf)
856 {
857 return sysfs_emit(buf, "%u\n", nilfs->ns_blocksize);
858 }
859
860 static
861 ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
862 struct the_nilfs *nilfs,
863 char *buf)
864 {
865 struct nilfs_super_block *raw_sb;
866 u64 dev_size;
867
868 down_read(&nilfs->ns_sem);
869 raw_sb = nilfs->ns_sbp[0];
870 dev_size = le64_to_cpu(raw_sb->s_dev_size);
871 up_read(&nilfs->ns_sem);
872
873 return sysfs_emit(buf, "%llu\n", dev_size);
874 }
875
876 static
877 ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
878 struct the_nilfs *nilfs,
879 char *buf)
880 {
881 sector_t free_blocks = 0;
882
883 nilfs_count_free_blocks(nilfs, &free_blocks);
884 return sysfs_emit(buf, "%llu\n",
885 (unsigned long long)free_blocks);
886 }
887
888 static
889 ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
890 struct the_nilfs *nilfs,
891 char *buf)
892 {
893 struct nilfs_super_block *raw_sb;
894 ssize_t len;
895
896 down_read(&nilfs->ns_sem);
897 raw_sb = nilfs->ns_sbp[0];
898 len = sysfs_emit(buf, "%pUb\n", raw_sb->s_uuid);
899 up_read(&nilfs->ns_sem);
900
901 return len;
902 }
903
904 static
905 ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
906 struct the_nilfs *nilfs,
907 char *buf)
908 {
909 struct nilfs_super_block *raw_sb;
910 ssize_t len;
911
912 down_read(&nilfs->ns_sem);
913 raw_sb = nilfs->ns_sbp[0];
914 len = scnprintf(buf, sizeof(raw_sb->s_volume_name), "%s\n",
915 raw_sb->s_volume_name);
916 up_read(&nilfs->ns_sem);
917
918 return len;
919 }
920
921 static const char dev_readme_str[] =
922 "The <device> group contains attributes that describe file system\n"
923 "partition's details.\n\n"
924 "(1) revision\n\tshow NILFS file system revision.\n\n"
925 "(2) blocksize\n\tshow volume block size in bytes.\n\n"
926 "(3) device_size\n\tshow volume size in bytes.\n\n"
927 "(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
928 "(5) uuid\n\tshow volume's UUID.\n\n"
929 "(6) volume_name\n\tshow volume's name.\n\n";
930
931 static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
932 struct the_nilfs *nilfs,
933 char *buf)
934 {
935 return sysfs_emit(buf, dev_readme_str);
936 }
937
938 NILFS_DEV_RO_ATTR(revision);
939 NILFS_DEV_RO_ATTR(blocksize);
940 NILFS_DEV_RO_ATTR(device_size);
941 NILFS_DEV_RO_ATTR(free_blocks);
942 NILFS_DEV_RO_ATTR(uuid);
943 NILFS_DEV_RO_ATTR(volume_name);
944 NILFS_DEV_RO_ATTR(README);
945
946 static struct attribute *nilfs_dev_attrs[] = {
947 NILFS_DEV_ATTR_LIST(revision),
948 NILFS_DEV_ATTR_LIST(blocksize),
949 NILFS_DEV_ATTR_LIST(device_size),
950 NILFS_DEV_ATTR_LIST(free_blocks),
951 NILFS_DEV_ATTR_LIST(uuid),
952 NILFS_DEV_ATTR_LIST(volume_name),
953 NILFS_DEV_ATTR_LIST(README),
954 NULL,
955 };
956 ATTRIBUTE_GROUPS(nilfs_dev);
957
958 static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
959 struct attribute *attr, char *buf)
960 {
961 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
962 ns_dev_kobj);
963 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
964 attr);
965
966 return a->show ? a->show(a, nilfs, buf) : 0;
967 }
968
969 static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
970 struct attribute *attr,
971 const char *buf, size_t len)
972 {
973 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
974 ns_dev_kobj);
975 struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
976 attr);
977
978 return a->store ? a->store(a, nilfs, buf, len) : 0;
979 }
980
981 static void nilfs_dev_attr_release(struct kobject *kobj)
982 {
983 struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
984 ns_dev_kobj);
985 complete(&nilfs->ns_dev_kobj_unregister);
986 }
987
988 static const struct sysfs_ops nilfs_dev_attr_ops = {
989 .show = nilfs_dev_attr_show,
990 .store = nilfs_dev_attr_store,
991 };
992
993 static const struct kobj_type nilfs_dev_ktype = {
994 .default_groups = nilfs_dev_groups,
995 .sysfs_ops = &nilfs_dev_attr_ops,
996 .release = nilfs_dev_attr_release,
997 };
998
999 int nilfs_sysfs_create_device_group(struct super_block *sb)
1000 {
1001 struct the_nilfs *nilfs = sb->s_fs_info;
1002 size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
1003 int err;
1004
1005 nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
1006 if (unlikely(!nilfs->ns_dev_subgroups)) {
1007 err = -ENOMEM;
1008 nilfs_err(sb, "unable to allocate memory for device group");
1009 goto failed_create_device_group;
1010 }
1011
1012 nilfs->ns_dev_kobj.kset = nilfs_kset;
1013 init_completion(&nilfs->ns_dev_kobj_unregister);
1014 err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
1015 "%s", sb->s_id);
1016 if (err)
1017 goto cleanup_dev_kobject;
1018
1019 err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
1020 if (err)
1021 goto cleanup_dev_kobject;
1022
1023 err = nilfs_sysfs_create_checkpoints_group(nilfs);
1024 if (err)
1025 goto delete_mounted_snapshots_group;
1026
1027 err = nilfs_sysfs_create_segments_group(nilfs);
1028 if (err)
1029 goto delete_checkpoints_group;
1030
1031 err = nilfs_sysfs_create_superblock_group(nilfs);
1032 if (err)
1033 goto delete_segments_group;
1034
1035 err = nilfs_sysfs_create_segctor_group(nilfs);
1036 if (err)
1037 goto delete_superblock_group;
1038
1039 return 0;
1040
1041 delete_superblock_group:
1042 nilfs_sysfs_delete_superblock_group(nilfs);
1043
1044 delete_segments_group:
1045 nilfs_sysfs_delete_segments_group(nilfs);
1046
1047 delete_checkpoints_group:
1048 nilfs_sysfs_delete_checkpoints_group(nilfs);
1049
1050 delete_mounted_snapshots_group:
1051 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1052
1053 cleanup_dev_kobject:
1054 kobject_put(&nilfs->ns_dev_kobj);
1055 kfree(nilfs->ns_dev_subgroups);
1056
1057 failed_create_device_group:
1058 return err;
1059 }
1060
1061 void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
1062 {
1063 nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
1064 nilfs_sysfs_delete_checkpoints_group(nilfs);
1065 nilfs_sysfs_delete_segments_group(nilfs);
1066 nilfs_sysfs_delete_superblock_group(nilfs);
1067 nilfs_sysfs_delete_segctor_group(nilfs);
1068 kobject_del(&nilfs->ns_dev_kobj);
1069 kobject_put(&nilfs->ns_dev_kobj);
1070 kfree(nilfs->ns_dev_subgroups);
1071 }
1072
1073 /************************************************************************
1074 * NILFS feature attrs *
1075 ************************************************************************/
1076
1077 static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
1078 struct attribute *attr, char *buf)
1079 {
1080 return sysfs_emit(buf, "%d.%d\n",
1081 NILFS_CURRENT_REV, NILFS_MINOR_REV);
1082 }
1083
1084 static const char features_readme_str[] =
1085 "The features group contains attributes that describe NILFS file\n"
1086 "system driver features.\n\n"
1087 "(1) revision\n\tshow current revision of NILFS file system driver.\n";
1088
1089 static ssize_t nilfs_feature_README_show(struct kobject *kobj,
1090 struct attribute *attr,
1091 char *buf)
1092 {
1093 return sysfs_emit(buf, features_readme_str);
1094 }
1095
1096 NILFS_FEATURE_RO_ATTR(revision);
1097 NILFS_FEATURE_RO_ATTR(README);
1098
1099 static struct attribute *nilfs_feature_attrs[] = {
1100 NILFS_FEATURE_ATTR_LIST(revision),
1101 NILFS_FEATURE_ATTR_LIST(README),
1102 NULL,
1103 };
1104
1105 static const struct attribute_group nilfs_feature_attr_group = {
1106 .name = "features",
1107 .attrs = nilfs_feature_attrs,
1108 };
1109
1110 int __init nilfs_sysfs_init(void)
1111 {
1112 int err;
1113
1114 nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
1115 if (!nilfs_kset) {
1116 err = -ENOMEM;
1117 nilfs_err(NULL, "unable to create sysfs entry: err=%d", err);
1118 goto failed_sysfs_init;
1119 }
1120
1121 err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1122 if (unlikely(err)) {
1123 nilfs_err(NULL, "unable to create feature group: err=%d", err);
1124 goto cleanup_sysfs_init;
1125 }
1126
1127 return 0;
1128
1129 cleanup_sysfs_init:
1130 kset_unregister(nilfs_kset);
1131
1132 failed_sysfs_init:
1133 return err;
1134 }
1135
1136 void nilfs_sysfs_exit(void)
1137 {
1138 sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
1139 kset_unregister(nilfs_kset);
1140 }
1141
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