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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/sched.h>
13#include <linux/spinlock.h>
14#include <linux/completion.h>
15#include <linux/buffer_head.h>
16#include <linux/module.h>
17#include <linux/kobject.h>
18#include <asm/uaccess.h>
19#include <linux/gfs2_ondisk.h>
20#include <linux/genhd.h>
21
22#include "gfs2.h"
23#include "incore.h"
24#include "sys.h"
25#include "super.h"
26#include "glock.h"
27#include "quota.h"
28#include "util.h"
29#include "glops.h"
30#include "recovery.h"
31
32struct gfs2_attr {
33 struct attribute attr;
34 ssize_t (*show)(struct gfs2_sbd *, char *);
35 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
36};
37
38static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
39 char *buf)
40{
41 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
42 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
43 return a->show ? a->show(sdp, buf) : 0;
44}
45
46static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
47 const char *buf, size_t len)
48{
49 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
50 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
51 return a->store ? a->store(sdp, buf, len) : len;
52}
53
54static const struct sysfs_ops gfs2_attr_ops = {
55 .show = gfs2_attr_show,
56 .store = gfs2_attr_store,
57};
58
59
60static struct kset *gfs2_kset;
61
62static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
63{
64 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
65 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
66}
67
68static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
69{
70 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
71}
72
73static int gfs2_uuid_valid(const u8 *uuid)
74{
75 int i;
76
77 for (i = 0; i < 16; i++) {
78 if (uuid[i])
79 return 1;
80 }
81 return 0;
82}
83
84static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
85{
86 struct super_block *s = sdp->sd_vfs;
87 const u8 *uuid = s->s_uuid;
88 buf[0] = '\0';
89 if (!gfs2_uuid_valid(uuid))
90 return 0;
91 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
92}
93
94static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
95{
96 struct super_block *sb = sdp->sd_vfs;
97 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
98
99 return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
100}
101
102static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
103{
104 int error, n;
105
106 error = kstrtoint(buf, 0, &n);
107 if (error)
108 return error;
109
110 if (!capable(CAP_SYS_ADMIN))
111 return -EPERM;
112
113 switch (n) {
114 case 0:
115 error = thaw_super(sdp->sd_vfs);
116 break;
117 case 1:
118 error = freeze_super(sdp->sd_vfs);
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 if (error) {
125 fs_warn(sdp, "freeze %d error %d", n, error);
126 return error;
127 }
128
129 return len;
130}
131
132static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
133{
134 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
135 return snprintf(buf, PAGE_SIZE, "%u\n", b);
136}
137
138static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
139{
140 int error, val;
141
142 if (!capable(CAP_SYS_ADMIN))
143 return -EPERM;
144
145 error = kstrtoint(buf, 0, &val);
146 if (error)
147 return error;
148
149 if (val != 1)
150 return -EINVAL;
151
152 gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
153
154 return len;
155}
156
157static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
158 size_t len)
159{
160 int error, val;
161
162 if (!capable(CAP_SYS_ADMIN))
163 return -EPERM;
164
165 error = kstrtoint(buf, 0, &val);
166 if (error)
167 return error;
168
169 if (val != 1)
170 return -EINVAL;
171
172 gfs2_statfs_sync(sdp->sd_vfs, 0);
173 return len;
174}
175
176static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
177 size_t len)
178{
179 int error, val;
180
181 if (!capable(CAP_SYS_ADMIN))
182 return -EPERM;
183
184 error = kstrtoint(buf, 0, &val);
185 if (error)
186 return error;
187
188 if (val != 1)
189 return -EINVAL;
190
191 gfs2_quota_sync(sdp->sd_vfs, 0);
192 return len;
193}
194
195static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
196 size_t len)
197{
198 struct kqid qid;
199 int error;
200 u32 id;
201
202 if (!capable(CAP_SYS_ADMIN))
203 return -EPERM;
204
205 error = kstrtou32(buf, 0, &id);
206 if (error)
207 return error;
208
209 qid = make_kqid(current_user_ns(), USRQUOTA, id);
210 if (!qid_valid(qid))
211 return -EINVAL;
212
213 error = gfs2_quota_refresh(sdp, qid);
214 return error ? error : len;
215}
216
217static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
218 size_t len)
219{
220 struct kqid qid;
221 int error;
222 u32 id;
223
224 if (!capable(CAP_SYS_ADMIN))
225 return -EPERM;
226
227 error = kstrtou32(buf, 0, &id);
228 if (error)
229 return error;
230
231 qid = make_kqid(current_user_ns(), GRPQUOTA, id);
232 if (!qid_valid(qid))
233 return -EINVAL;
234
235 error = gfs2_quota_refresh(sdp, qid);
236 return error ? error : len;
237}
238
239static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
240{
241 struct gfs2_glock *gl;
242 const struct gfs2_glock_operations *glops;
243 unsigned int glmode;
244 unsigned int gltype;
245 unsigned long long glnum;
246 char mode[16];
247 int rv;
248
249 if (!capable(CAP_SYS_ADMIN))
250 return -EPERM;
251
252 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
253 mode);
254 if (rv != 3)
255 return -EINVAL;
256
257 if (strcmp(mode, "EX") == 0)
258 glmode = LM_ST_UNLOCKED;
259 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
260 glmode = LM_ST_DEFERRED;
261 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
262 glmode = LM_ST_SHARED;
263 else
264 return -EINVAL;
265
266 if (gltype > LM_TYPE_JOURNAL)
267 return -EINVAL;
268 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
269 glops = &gfs2_freeze_glops;
270 else
271 glops = gfs2_glops_list[gltype];
272 if (glops == NULL)
273 return -EINVAL;
274 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
275 fs_info(sdp, "demote interface used\n");
276 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
277 if (rv)
278 return rv;
279 gfs2_glock_cb(gl, glmode);
280 gfs2_glock_put(gl);
281 return len;
282}
283
284
285#define GFS2_ATTR(name, mode, show, store) \
286static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
287
288GFS2_ATTR(id, 0444, id_show, NULL);
289GFS2_ATTR(fsname, 0444, fsname_show, NULL);
290GFS2_ATTR(uuid, 0444, uuid_show, NULL);
291GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
292GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
293GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
294GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
295GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
296GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
297GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
298
299static struct attribute *gfs2_attrs[] = {
300 &gfs2_attr_id.attr,
301 &gfs2_attr_fsname.attr,
302 &gfs2_attr_uuid.attr,
303 &gfs2_attr_freeze.attr,
304 &gfs2_attr_withdraw.attr,
305 &gfs2_attr_statfs_sync.attr,
306 &gfs2_attr_quota_sync.attr,
307 &gfs2_attr_quota_refresh_user.attr,
308 &gfs2_attr_quota_refresh_group.attr,
309 &gfs2_attr_demote_rq.attr,
310 NULL,
311};
312
313static void gfs2_sbd_release(struct kobject *kobj)
314{
315 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
316
317 kfree(sdp);
318}
319
320static struct kobj_type gfs2_ktype = {
321 .release = gfs2_sbd_release,
322 .default_attrs = gfs2_attrs,
323 .sysfs_ops = &gfs2_attr_ops,
324};
325
326
327/*
328 * lock_module. Originally from lock_dlm
329 */
330
331static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
332{
333 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
334 return sprintf(buf, "%s\n", ops->lm_proto_name);
335}
336
337static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
338{
339 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
340 ssize_t ret;
341 int val = 0;
342
343 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
344 val = 1;
345 ret = sprintf(buf, "%d\n", val);
346 return ret;
347}
348
349static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
350{
351 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
352 int ret, val;
353
354 ret = kstrtoint(buf, 0, &val);
355 if (ret)
356 return ret;
357
358 if (val == 1)
359 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
360 else if (val == 0) {
361 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
362 smp_mb__after_atomic();
363 gfs2_glock_thaw(sdp);
364 } else {
365 return -EINVAL;
366 }
367 return len;
368}
369
370static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
371{
372 int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
373
374 return sprintf(buf, "%d\n", val);
375}
376
377static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
378{
379 int ret, val;
380
381 ret = kstrtoint(buf, 0, &val);
382 if (ret)
383 return ret;
384
385 if ((val == 1) &&
386 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
387 complete(&sdp->sd_wdack);
388 else
389 return -EINVAL;
390 return len;
391}
392
393static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
394{
395 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
396 return sprintf(buf, "%d\n", ls->ls_first);
397}
398
399static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
400{
401 unsigned first;
402 int rv;
403
404 rv = sscanf(buf, "%u", &first);
405 if (rv != 1 || first > 1)
406 return -EINVAL;
407 rv = wait_for_completion_killable(&sdp->sd_locking_init);
408 if (rv)
409 return rv;
410 spin_lock(&sdp->sd_jindex_spin);
411 rv = -EBUSY;
412 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
413 goto out;
414 rv = -EINVAL;
415 if (sdp->sd_args.ar_spectator)
416 goto out;
417 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
418 goto out;
419 sdp->sd_lockstruct.ls_first = first;
420 rv = 0;
421out:
422 spin_unlock(&sdp->sd_jindex_spin);
423 return rv ? rv : len;
424}
425
426static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
427{
428 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
429 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
430}
431
432int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
433{
434 struct gfs2_jdesc *jd;
435 int rv;
436
437 /* Wait for our primary journal to be initialized */
438 wait_for_completion(&sdp->sd_journal_ready);
439
440 spin_lock(&sdp->sd_jindex_spin);
441 rv = -EBUSY;
442 if (sdp->sd_jdesc->jd_jid == jid)
443 goto out;
444 rv = -ENOENT;
445 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
446 if (jd->jd_jid != jid)
447 continue;
448 rv = gfs2_recover_journal(jd, false);
449 break;
450 }
451out:
452 spin_unlock(&sdp->sd_jindex_spin);
453 return rv;
454}
455
456static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
457{
458 unsigned jid;
459 int rv;
460
461 rv = sscanf(buf, "%u", &jid);
462 if (rv != 1)
463 return -EINVAL;
464
465 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
466 rv = -ESHUTDOWN;
467 goto out;
468 }
469
470 rv = gfs2_recover_set(sdp, jid);
471out:
472 return rv ? rv : len;
473}
474
475static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
476{
477 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
478 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
479}
480
481static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
482{
483 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
484 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
485}
486
487static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
488{
489 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
490}
491
492static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
493{
494 int jid;
495 int rv;
496
497 rv = sscanf(buf, "%d", &jid);
498 if (rv != 1)
499 return -EINVAL;
500 rv = wait_for_completion_killable(&sdp->sd_locking_init);
501 if (rv)
502 return rv;
503 spin_lock(&sdp->sd_jindex_spin);
504 rv = -EINVAL;
505 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
506 goto out;
507 rv = -EBUSY;
508 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
509 goto out;
510 rv = 0;
511 if (sdp->sd_args.ar_spectator && jid > 0)
512 rv = jid = -EINVAL;
513 sdp->sd_lockstruct.ls_jid = jid;
514 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
515 smp_mb__after_atomic();
516 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
517out:
518 spin_unlock(&sdp->sd_jindex_spin);
519 return rv ? rv : len;
520}
521
522#define GDLM_ATTR(_name,_mode,_show,_store) \
523static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
524
525GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
526GDLM_ATTR(block, 0644, block_show, block_store);
527GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store);
528GDLM_ATTR(jid, 0644, jid_show, jid_store);
529GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
530GDLM_ATTR(first_done, 0444, first_done_show, NULL);
531GDLM_ATTR(recover, 0600, NULL, recover_store);
532GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
533GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
534
535static struct attribute *lock_module_attrs[] = {
536 &gdlm_attr_proto_name.attr,
537 &gdlm_attr_block.attr,
538 &gdlm_attr_withdraw.attr,
539 &gdlm_attr_jid.attr,
540 &gdlm_attr_first.attr,
541 &gdlm_attr_first_done.attr,
542 &gdlm_attr_recover.attr,
543 &gdlm_attr_recover_done.attr,
544 &gdlm_attr_recover_status.attr,
545 NULL,
546};
547
548/*
549 * get and set struct gfs2_tune fields
550 */
551
552static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
553{
554 return snprintf(buf, PAGE_SIZE, "%u %u\n",
555 sdp->sd_tune.gt_quota_scale_num,
556 sdp->sd_tune.gt_quota_scale_den);
557}
558
559static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
560 size_t len)
561{
562 struct gfs2_tune *gt = &sdp->sd_tune;
563 unsigned int x, y;
564
565 if (!capable(CAP_SYS_ADMIN))
566 return -EPERM;
567
568 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
569 return -EINVAL;
570
571 spin_lock(>->gt_spin);
572 gt->gt_quota_scale_num = x;
573 gt->gt_quota_scale_den = y;
574 spin_unlock(>->gt_spin);
575 return len;
576}
577
578static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
579 int check_zero, const char *buf, size_t len)
580{
581 struct gfs2_tune *gt = &sdp->sd_tune;
582 unsigned int x;
583 int error;
584
585 if (!capable(CAP_SYS_ADMIN))
586 return -EPERM;
587
588 error = kstrtouint(buf, 0, &x);
589 if (error)
590 return error;
591
592 if (check_zero && !x)
593 return -EINVAL;
594
595 spin_lock(>->gt_spin);
596 *field = x;
597 spin_unlock(>->gt_spin);
598 return len;
599}
600
601#define TUNE_ATTR_3(name, show, store) \
602static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
603
604#define TUNE_ATTR_2(name, store) \
605static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
606{ \
607 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
608} \
609TUNE_ATTR_3(name, name##_show, store)
610
611#define TUNE_ATTR(name, check_zero) \
612static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
613{ \
614 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
615} \
616TUNE_ATTR_2(name, name##_store)
617
618TUNE_ATTR(quota_warn_period, 0);
619TUNE_ATTR(quota_quantum, 0);
620TUNE_ATTR(max_readahead, 0);
621TUNE_ATTR(complain_secs, 0);
622TUNE_ATTR(statfs_slow, 0);
623TUNE_ATTR(new_files_jdata, 0);
624TUNE_ATTR(statfs_quantum, 1);
625TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
626
627static struct attribute *tune_attrs[] = {
628 &tune_attr_quota_warn_period.attr,
629 &tune_attr_quota_quantum.attr,
630 &tune_attr_max_readahead.attr,
631 &tune_attr_complain_secs.attr,
632 &tune_attr_statfs_slow.attr,
633 &tune_attr_statfs_quantum.attr,
634 &tune_attr_quota_scale.attr,
635 &tune_attr_new_files_jdata.attr,
636 NULL,
637};
638
639static struct attribute_group tune_group = {
640 .name = "tune",
641 .attrs = tune_attrs,
642};
643
644static struct attribute_group lock_module_group = {
645 .name = "lock_module",
646 .attrs = lock_module_attrs,
647};
648
649int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
650{
651 struct super_block *sb = sdp->sd_vfs;
652 int error;
653 char ro[20];
654 char spectator[20];
655 char *envp[] = { ro, spectator, NULL };
656 int sysfs_frees_sdp = 0;
657
658 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
659 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
660
661 sdp->sd_kobj.kset = gfs2_kset;
662 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
663 "%s", sdp->sd_table_name);
664 if (error)
665 goto fail_reg;
666
667 sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
668 function gfs2_sbd_release. */
669 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
670 if (error)
671 goto fail_reg;
672
673 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
674 if (error)
675 goto fail_tune;
676
677 error = sysfs_create_link(&sdp->sd_kobj,
678 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
679 "device");
680 if (error)
681 goto fail_lock_module;
682
683 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
684 return 0;
685
686fail_lock_module:
687 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
688fail_tune:
689 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
690fail_reg:
691 free_percpu(sdp->sd_lkstats);
692 fs_err(sdp, "error %d adding sysfs files", error);
693 if (sysfs_frees_sdp)
694 kobject_put(&sdp->sd_kobj);
695 else
696 kfree(sdp);
697 sb->s_fs_info = NULL;
698 return error;
699}
700
701void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
702{
703 sysfs_remove_link(&sdp->sd_kobj, "device");
704 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
705 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
706 kobject_put(&sdp->sd_kobj);
707}
708
709static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
710 struct kobj_uevent_env *env)
711{
712 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
713 struct super_block *s = sdp->sd_vfs;
714 const u8 *uuid = s->s_uuid;
715
716 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
717 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
718 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
719 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
720 if (gfs2_uuid_valid(uuid))
721 add_uevent_var(env, "UUID=%pUB", uuid);
722 return 0;
723}
724
725static const struct kset_uevent_ops gfs2_uevent_ops = {
726 .uevent = gfs2_uevent,
727};
728
729int gfs2_sys_init(void)
730{
731 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
732 if (!gfs2_kset)
733 return -ENOMEM;
734 return 0;
735}
736
737void gfs2_sys_uninit(void)
738{
739 kset_unregister(gfs2_kset);
740}
741
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/sched.h>
13#include <linux/spinlock.h>
14#include <linux/completion.h>
15#include <linux/buffer_head.h>
16#include <linux/module.h>
17#include <linux/kobject.h>
18#include <asm/uaccess.h>
19#include <linux/gfs2_ondisk.h>
20#include <linux/genhd.h>
21
22#include "gfs2.h"
23#include "incore.h"
24#include "sys.h"
25#include "super.h"
26#include "glock.h"
27#include "quota.h"
28#include "util.h"
29#include "glops.h"
30#include "recovery.h"
31
32struct gfs2_attr {
33 struct attribute attr;
34 ssize_t (*show)(struct gfs2_sbd *, char *);
35 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
36};
37
38static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
39 char *buf)
40{
41 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
42 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
43 return a->show ? a->show(sdp, buf) : 0;
44}
45
46static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
47 const char *buf, size_t len)
48{
49 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
50 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
51 return a->store ? a->store(sdp, buf, len) : len;
52}
53
54static const struct sysfs_ops gfs2_attr_ops = {
55 .show = gfs2_attr_show,
56 .store = gfs2_attr_store,
57};
58
59
60static struct kset *gfs2_kset;
61
62static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
63{
64 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
65 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
66}
67
68static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
69{
70 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
71}
72
73static int gfs2_uuid_valid(const u8 *uuid)
74{
75 int i;
76
77 for (i = 0; i < 16; i++) {
78 if (uuid[i])
79 return 1;
80 }
81 return 0;
82}
83
84static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
85{
86 struct super_block *s = sdp->sd_vfs;
87 const u8 *uuid = s->s_uuid;
88 buf[0] = '\0';
89 if (!gfs2_uuid_valid(uuid))
90 return 0;
91 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
92}
93
94static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
95{
96 struct super_block *sb = sdp->sd_vfs;
97 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
98
99 return snprintf(buf, PAGE_SIZE, "%u\n", frozen);
100}
101
102static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
103{
104 int error;
105 int n = simple_strtol(buf, NULL, 0);
106
107 if (!capable(CAP_SYS_ADMIN))
108 return -EPERM;
109
110 switch (n) {
111 case 0:
112 error = thaw_super(sdp->sd_vfs);
113 break;
114 case 1:
115 error = freeze_super(sdp->sd_vfs);
116 break;
117 default:
118 return -EINVAL;
119 }
120
121 if (error) {
122 fs_warn(sdp, "freeze %d error %d", n, error);
123 return error;
124 }
125
126 return len;
127}
128
129static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
130{
131 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
132 return snprintf(buf, PAGE_SIZE, "%u\n", b);
133}
134
135static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
136{
137 if (!capable(CAP_SYS_ADMIN))
138 return -EPERM;
139
140 if (simple_strtol(buf, NULL, 0) != 1)
141 return -EINVAL;
142
143 gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
144
145 return len;
146}
147
148static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
149 size_t len)
150{
151 if (!capable(CAP_SYS_ADMIN))
152 return -EPERM;
153
154 if (simple_strtol(buf, NULL, 0) != 1)
155 return -EINVAL;
156
157 gfs2_statfs_sync(sdp->sd_vfs, 0);
158 return len;
159}
160
161static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
162 size_t len)
163{
164 if (!capable(CAP_SYS_ADMIN))
165 return -EPERM;
166
167 if (simple_strtol(buf, NULL, 0) != 1)
168 return -EINVAL;
169
170 gfs2_quota_sync(sdp->sd_vfs, 0);
171 return len;
172}
173
174static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
175 size_t len)
176{
177 struct kqid qid;
178 int error;
179 u32 id;
180
181 if (!capable(CAP_SYS_ADMIN))
182 return -EPERM;
183
184 id = simple_strtoul(buf, NULL, 0);
185
186 qid = make_kqid(current_user_ns(), USRQUOTA, id);
187 if (!qid_valid(qid))
188 return -EINVAL;
189
190 error = gfs2_quota_refresh(sdp, qid);
191 return error ? error : len;
192}
193
194static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
195 size_t len)
196{
197 struct kqid qid;
198 int error;
199 u32 id;
200
201 if (!capable(CAP_SYS_ADMIN))
202 return -EPERM;
203
204 id = simple_strtoul(buf, NULL, 0);
205
206 qid = make_kqid(current_user_ns(), GRPQUOTA, id);
207 if (!qid_valid(qid))
208 return -EINVAL;
209
210 error = gfs2_quota_refresh(sdp, qid);
211 return error ? error : len;
212}
213
214static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
215{
216 struct gfs2_glock *gl;
217 const struct gfs2_glock_operations *glops;
218 unsigned int glmode;
219 unsigned int gltype;
220 unsigned long long glnum;
221 char mode[16];
222 int rv;
223
224 if (!capable(CAP_SYS_ADMIN))
225 return -EPERM;
226
227 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
228 mode);
229 if (rv != 3)
230 return -EINVAL;
231
232 if (strcmp(mode, "EX") == 0)
233 glmode = LM_ST_UNLOCKED;
234 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
235 glmode = LM_ST_DEFERRED;
236 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
237 glmode = LM_ST_SHARED;
238 else
239 return -EINVAL;
240
241 if (gltype > LM_TYPE_JOURNAL)
242 return -EINVAL;
243 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
244 glops = &gfs2_trans_glops;
245 else
246 glops = gfs2_glops_list[gltype];
247 if (glops == NULL)
248 return -EINVAL;
249 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
250 fs_info(sdp, "demote interface used\n");
251 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
252 if (rv)
253 return rv;
254 gfs2_glock_cb(gl, glmode);
255 gfs2_glock_put(gl);
256 return len;
257}
258
259
260#define GFS2_ATTR(name, mode, show, store) \
261static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
262
263GFS2_ATTR(id, 0444, id_show, NULL);
264GFS2_ATTR(fsname, 0444, fsname_show, NULL);
265GFS2_ATTR(uuid, 0444, uuid_show, NULL);
266GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
267GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
268GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
269GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
270GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
271GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
272GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
273
274static struct attribute *gfs2_attrs[] = {
275 &gfs2_attr_id.attr,
276 &gfs2_attr_fsname.attr,
277 &gfs2_attr_uuid.attr,
278 &gfs2_attr_freeze.attr,
279 &gfs2_attr_withdraw.attr,
280 &gfs2_attr_statfs_sync.attr,
281 &gfs2_attr_quota_sync.attr,
282 &gfs2_attr_quota_refresh_user.attr,
283 &gfs2_attr_quota_refresh_group.attr,
284 &gfs2_attr_demote_rq.attr,
285 NULL,
286};
287
288static void gfs2_sbd_release(struct kobject *kobj)
289{
290 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
291
292 kfree(sdp);
293}
294
295static struct kobj_type gfs2_ktype = {
296 .release = gfs2_sbd_release,
297 .default_attrs = gfs2_attrs,
298 .sysfs_ops = &gfs2_attr_ops,
299};
300
301
302/*
303 * lock_module. Originally from lock_dlm
304 */
305
306static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
307{
308 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
309 return sprintf(buf, "%s\n", ops->lm_proto_name);
310}
311
312static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
313{
314 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
315 ssize_t ret;
316 int val = 0;
317
318 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
319 val = 1;
320 ret = sprintf(buf, "%d\n", val);
321 return ret;
322}
323
324static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
325{
326 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
327 ssize_t ret = len;
328 int val;
329
330 val = simple_strtol(buf, NULL, 0);
331
332 if (val == 1)
333 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
334 else if (val == 0) {
335 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
336 smp_mb__after_clear_bit();
337 gfs2_glock_thaw(sdp);
338 } else {
339 ret = -EINVAL;
340 }
341 return ret;
342}
343
344static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
345{
346 int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
347
348 return sprintf(buf, "%d\n", val);
349}
350
351static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
352{
353 ssize_t ret = len;
354 int val;
355
356 val = simple_strtol(buf, NULL, 0);
357
358 if ((val == 1) &&
359 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
360 complete(&sdp->sd_wdack);
361 else
362 ret = -EINVAL;
363 return ret;
364}
365
366static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
367{
368 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
369 return sprintf(buf, "%d\n", ls->ls_first);
370}
371
372static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
373{
374 unsigned first;
375 int rv;
376
377 rv = sscanf(buf, "%u", &first);
378 if (rv != 1 || first > 1)
379 return -EINVAL;
380 rv = wait_for_completion_killable(&sdp->sd_locking_init);
381 if (rv)
382 return rv;
383 spin_lock(&sdp->sd_jindex_spin);
384 rv = -EBUSY;
385 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
386 goto out;
387 rv = -EINVAL;
388 if (sdp->sd_args.ar_spectator)
389 goto out;
390 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
391 goto out;
392 sdp->sd_lockstruct.ls_first = first;
393 rv = 0;
394out:
395 spin_unlock(&sdp->sd_jindex_spin);
396 return rv ? rv : len;
397}
398
399static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
400{
401 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
402 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
403}
404
405int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
406{
407 struct gfs2_jdesc *jd;
408 int rv;
409
410 spin_lock(&sdp->sd_jindex_spin);
411 rv = -EBUSY;
412 if (sdp->sd_jdesc->jd_jid == jid)
413 goto out;
414 rv = -ENOENT;
415 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
416 if (jd->jd_jid != jid)
417 continue;
418 rv = gfs2_recover_journal(jd, false);
419 break;
420 }
421out:
422 spin_unlock(&sdp->sd_jindex_spin);
423 return rv;
424}
425
426static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
427{
428 unsigned jid;
429 int rv;
430
431 rv = sscanf(buf, "%u", &jid);
432 if (rv != 1)
433 return -EINVAL;
434
435 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
436 rv = -ESHUTDOWN;
437 goto out;
438 }
439
440 rv = gfs2_recover_set(sdp, jid);
441out:
442 return rv ? rv : len;
443}
444
445static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
446{
447 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
448 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
449}
450
451static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
452{
453 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
454 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
455}
456
457static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
458{
459 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
460}
461
462static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
463{
464 int jid;
465 int rv;
466
467 rv = sscanf(buf, "%d", &jid);
468 if (rv != 1)
469 return -EINVAL;
470 rv = wait_for_completion_killable(&sdp->sd_locking_init);
471 if (rv)
472 return rv;
473 spin_lock(&sdp->sd_jindex_spin);
474 rv = -EINVAL;
475 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
476 goto out;
477 rv = -EBUSY;
478 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
479 goto out;
480 rv = 0;
481 if (sdp->sd_args.ar_spectator && jid > 0)
482 rv = jid = -EINVAL;
483 sdp->sd_lockstruct.ls_jid = jid;
484 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
485 smp_mb__after_clear_bit();
486 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
487out:
488 spin_unlock(&sdp->sd_jindex_spin);
489 return rv ? rv : len;
490}
491
492#define GDLM_ATTR(_name,_mode,_show,_store) \
493static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
494
495GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
496GDLM_ATTR(block, 0644, block_show, block_store);
497GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store);
498GDLM_ATTR(jid, 0644, jid_show, jid_store);
499GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
500GDLM_ATTR(first_done, 0444, first_done_show, NULL);
501GDLM_ATTR(recover, 0600, NULL, recover_store);
502GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
503GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
504
505static struct attribute *lock_module_attrs[] = {
506 &gdlm_attr_proto_name.attr,
507 &gdlm_attr_block.attr,
508 &gdlm_attr_withdraw.attr,
509 &gdlm_attr_jid.attr,
510 &gdlm_attr_first.attr,
511 &gdlm_attr_first_done.attr,
512 &gdlm_attr_recover.attr,
513 &gdlm_attr_recover_done.attr,
514 &gdlm_attr_recover_status.attr,
515 NULL,
516};
517
518/*
519 * get and set struct gfs2_tune fields
520 */
521
522static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
523{
524 return snprintf(buf, PAGE_SIZE, "%u %u\n",
525 sdp->sd_tune.gt_quota_scale_num,
526 sdp->sd_tune.gt_quota_scale_den);
527}
528
529static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
530 size_t len)
531{
532 struct gfs2_tune *gt = &sdp->sd_tune;
533 unsigned int x, y;
534
535 if (!capable(CAP_SYS_ADMIN))
536 return -EPERM;
537
538 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
539 return -EINVAL;
540
541 spin_lock(>->gt_spin);
542 gt->gt_quota_scale_num = x;
543 gt->gt_quota_scale_den = y;
544 spin_unlock(>->gt_spin);
545 return len;
546}
547
548static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
549 int check_zero, const char *buf, size_t len)
550{
551 struct gfs2_tune *gt = &sdp->sd_tune;
552 unsigned int x;
553
554 if (!capable(CAP_SYS_ADMIN))
555 return -EPERM;
556
557 x = simple_strtoul(buf, NULL, 0);
558
559 if (check_zero && !x)
560 return -EINVAL;
561
562 spin_lock(>->gt_spin);
563 *field = x;
564 spin_unlock(>->gt_spin);
565 return len;
566}
567
568#define TUNE_ATTR_3(name, show, store) \
569static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
570
571#define TUNE_ATTR_2(name, store) \
572static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
573{ \
574 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
575} \
576TUNE_ATTR_3(name, name##_show, store)
577
578#define TUNE_ATTR(name, check_zero) \
579static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
580{ \
581 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
582} \
583TUNE_ATTR_2(name, name##_store)
584
585TUNE_ATTR(quota_warn_period, 0);
586TUNE_ATTR(quota_quantum, 0);
587TUNE_ATTR(max_readahead, 0);
588TUNE_ATTR(complain_secs, 0);
589TUNE_ATTR(statfs_slow, 0);
590TUNE_ATTR(new_files_jdata, 0);
591TUNE_ATTR(statfs_quantum, 1);
592TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
593
594static struct attribute *tune_attrs[] = {
595 &tune_attr_quota_warn_period.attr,
596 &tune_attr_quota_quantum.attr,
597 &tune_attr_max_readahead.attr,
598 &tune_attr_complain_secs.attr,
599 &tune_attr_statfs_slow.attr,
600 &tune_attr_statfs_quantum.attr,
601 &tune_attr_quota_scale.attr,
602 &tune_attr_new_files_jdata.attr,
603 NULL,
604};
605
606static struct attribute_group tune_group = {
607 .name = "tune",
608 .attrs = tune_attrs,
609};
610
611static struct attribute_group lock_module_group = {
612 .name = "lock_module",
613 .attrs = lock_module_attrs,
614};
615
616int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
617{
618 struct super_block *sb = sdp->sd_vfs;
619 int error;
620 char ro[20];
621 char spectator[20];
622 char *envp[] = { ro, spectator, NULL };
623 int sysfs_frees_sdp = 0;
624
625 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
626 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
627
628 sdp->sd_kobj.kset = gfs2_kset;
629 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
630 "%s", sdp->sd_table_name);
631 if (error)
632 goto fail_reg;
633
634 sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
635 function gfs2_sbd_release. */
636 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
637 if (error)
638 goto fail_reg;
639
640 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
641 if (error)
642 goto fail_tune;
643
644 error = sysfs_create_link(&sdp->sd_kobj,
645 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
646 "device");
647 if (error)
648 goto fail_lock_module;
649
650 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
651 return 0;
652
653fail_lock_module:
654 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
655fail_tune:
656 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
657fail_reg:
658 free_percpu(sdp->sd_lkstats);
659 fs_err(sdp, "error %d adding sysfs files", error);
660 if (sysfs_frees_sdp)
661 kobject_put(&sdp->sd_kobj);
662 else
663 kfree(sdp);
664 sb->s_fs_info = NULL;
665 return error;
666}
667
668void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
669{
670 sysfs_remove_link(&sdp->sd_kobj, "device");
671 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
672 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
673 kobject_put(&sdp->sd_kobj);
674}
675
676static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
677 struct kobj_uevent_env *env)
678{
679 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
680 struct super_block *s = sdp->sd_vfs;
681 const u8 *uuid = s->s_uuid;
682
683 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
684 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
685 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
686 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
687 if (gfs2_uuid_valid(uuid))
688 add_uevent_var(env, "UUID=%pUB", uuid);
689 return 0;
690}
691
692static const struct kset_uevent_ops gfs2_uevent_ops = {
693 .uevent = gfs2_uevent,
694};
695
696int gfs2_sys_init(void)
697{
698 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
699 if (!gfs2_kset)
700 return -ENOMEM;
701 return 0;
702}
703
704void gfs2_sys_uninit(void)
705{
706 kset_unregister(gfs2_kset);
707}
708