Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/sched.h>
10#include <linux/cred.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/module.h>
15#include <linux/kobject.h>
16#include <linux/uaccess.h>
17#include <linux/gfs2_ondisk.h>
18#include <linux/blkdev.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "sys.h"
23#include "super.h"
24#include "glock.h"
25#include "quota.h"
26#include "util.h"
27#include "glops.h"
28#include "recovery.h"
29
30struct gfs2_attr {
31 struct attribute attr;
32 ssize_t (*show)(struct gfs2_sbd *, char *);
33 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
34};
35
36static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
37 char *buf)
38{
39 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
40 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
41 return a->show ? a->show(sdp, buf) : 0;
42}
43
44static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
45 const char *buf, size_t len)
46{
47 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
48 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
49 return a->store ? a->store(sdp, buf, len) : len;
50}
51
52static const struct sysfs_ops gfs2_attr_ops = {
53 .show = gfs2_attr_show,
54 .store = gfs2_attr_store,
55};
56
57
58static struct kset *gfs2_kset;
59
60static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
61{
62 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
63 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
64}
65
66static ssize_t status_show(struct gfs2_sbd *sdp, char *buf)
67{
68 unsigned long f = sdp->sd_flags;
69 ssize_t s;
70
71 s = snprintf(buf, PAGE_SIZE,
72 "Journal Checked: %d\n"
73 "Journal Live: %d\n"
74 "Journal ID: %d\n"
75 "Spectator: %d\n"
76 "Withdrawn: %d\n"
77 "No barriers: %d\n"
78 "No recovery: %d\n"
79 "Demote: %d\n"
80 "No Journal ID: %d\n"
81 "Mounted RO: %d\n"
82 "RO Recovery: %d\n"
83 "Skip DLM Unlock: %d\n"
84 "Force AIL Flush: %d\n"
85 "FS Frozen: %d\n"
86 "Withdrawing: %d\n"
87 "Withdraw In Prog: %d\n"
88 "Remote Withdraw: %d\n"
89 "Withdraw Recovery: %d\n"
90 "sd_log_error: %d\n"
91 "sd_log_flush_lock: %d\n"
92 "sd_log_num_revoke: %u\n"
93 "sd_log_in_flight: %d\n"
94 "sd_log_blks_needed: %d\n"
95 "sd_log_blks_free: %d\n"
96 "sd_log_flush_head: %d\n"
97 "sd_log_flush_tail: %d\n"
98 "sd_log_blks_reserved: %d\n"
99 "sd_log_revokes_available: %d\n",
100 test_bit(SDF_JOURNAL_CHECKED, &f),
101 test_bit(SDF_JOURNAL_LIVE, &f),
102 (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0),
103 (sdp->sd_args.ar_spectator ? 1 : 0),
104 test_bit(SDF_WITHDRAWN, &f),
105 test_bit(SDF_NOBARRIERS, &f),
106 test_bit(SDF_NORECOVERY, &f),
107 test_bit(SDF_DEMOTE, &f),
108 test_bit(SDF_NOJOURNALID, &f),
109 (sb_rdonly(sdp->sd_vfs) ? 1 : 0),
110 test_bit(SDF_RORECOVERY, &f),
111 test_bit(SDF_SKIP_DLM_UNLOCK, &f),
112 test_bit(SDF_FORCE_AIL_FLUSH, &f),
113 test_bit(SDF_FS_FROZEN, &f),
114 test_bit(SDF_WITHDRAWING, &f),
115 test_bit(SDF_WITHDRAW_IN_PROG, &f),
116 test_bit(SDF_REMOTE_WITHDRAW, &f),
117 test_bit(SDF_WITHDRAW_RECOVERY, &f),
118 sdp->sd_log_error,
119 rwsem_is_locked(&sdp->sd_log_flush_lock),
120 sdp->sd_log_num_revoke,
121 atomic_read(&sdp->sd_log_in_flight),
122 atomic_read(&sdp->sd_log_blks_needed),
123 atomic_read(&sdp->sd_log_blks_free),
124 sdp->sd_log_flush_head,
125 sdp->sd_log_flush_tail,
126 sdp->sd_log_blks_reserved,
127 atomic_read(&sdp->sd_log_revokes_available));
128 return s;
129}
130
131static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
132{
133 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
134}
135
136static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
137{
138 struct super_block *s = sdp->sd_vfs;
139
140 buf[0] = '\0';
141 if (uuid_is_null(&s->s_uuid))
142 return 0;
143 return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
144}
145
146static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
147{
148 struct super_block *sb = sdp->sd_vfs;
149 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
150
151 return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
152}
153
154static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
155{
156 int error, n;
157
158 error = kstrtoint(buf, 0, &n);
159 if (error)
160 return error;
161
162 if (!capable(CAP_SYS_ADMIN))
163 return -EPERM;
164
165 switch (n) {
166 case 0:
167 error = thaw_super(sdp->sd_vfs);
168 break;
169 case 1:
170 error = freeze_super(sdp->sd_vfs);
171 break;
172 default:
173 return -EINVAL;
174 }
175
176 if (error) {
177 fs_warn(sdp, "freeze %d error %d\n", n, error);
178 return error;
179 }
180
181 return len;
182}
183
184static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
185{
186 unsigned int b = gfs2_withdrawn(sdp);
187 return snprintf(buf, PAGE_SIZE, "%u\n", b);
188}
189
190static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
191{
192 int error, val;
193
194 if (!capable(CAP_SYS_ADMIN))
195 return -EPERM;
196
197 error = kstrtoint(buf, 0, &val);
198 if (error)
199 return error;
200
201 if (val != 1)
202 return -EINVAL;
203
204 gfs2_lm(sdp, "withdrawing from cluster at user's request\n");
205 gfs2_withdraw(sdp);
206
207 return len;
208}
209
210static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
211 size_t len)
212{
213 int error, val;
214
215 if (!capable(CAP_SYS_ADMIN))
216 return -EPERM;
217
218 error = kstrtoint(buf, 0, &val);
219 if (error)
220 return error;
221
222 if (val != 1)
223 return -EINVAL;
224
225 gfs2_statfs_sync(sdp->sd_vfs, 0);
226 return len;
227}
228
229static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
230 size_t len)
231{
232 int error, val;
233
234 if (!capable(CAP_SYS_ADMIN))
235 return -EPERM;
236
237 error = kstrtoint(buf, 0, &val);
238 if (error)
239 return error;
240
241 if (val != 1)
242 return -EINVAL;
243
244 gfs2_quota_sync(sdp->sd_vfs, 0);
245 return len;
246}
247
248static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
249 size_t len)
250{
251 struct kqid qid;
252 int error;
253 u32 id;
254
255 if (!capable(CAP_SYS_ADMIN))
256 return -EPERM;
257
258 error = kstrtou32(buf, 0, &id);
259 if (error)
260 return error;
261
262 qid = make_kqid(current_user_ns(), USRQUOTA, id);
263 if (!qid_valid(qid))
264 return -EINVAL;
265
266 error = gfs2_quota_refresh(sdp, qid);
267 return error ? error : len;
268}
269
270static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
271 size_t len)
272{
273 struct kqid qid;
274 int error;
275 u32 id;
276
277 if (!capable(CAP_SYS_ADMIN))
278 return -EPERM;
279
280 error = kstrtou32(buf, 0, &id);
281 if (error)
282 return error;
283
284 qid = make_kqid(current_user_ns(), GRPQUOTA, id);
285 if (!qid_valid(qid))
286 return -EINVAL;
287
288 error = gfs2_quota_refresh(sdp, qid);
289 return error ? error : len;
290}
291
292static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
293{
294 struct gfs2_glock *gl;
295 const struct gfs2_glock_operations *glops;
296 unsigned int glmode;
297 unsigned int gltype;
298 unsigned long long glnum;
299 char mode[16];
300 int rv;
301
302 if (!capable(CAP_SYS_ADMIN))
303 return -EPERM;
304
305 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
306 mode);
307 if (rv != 3)
308 return -EINVAL;
309
310 if (strcmp(mode, "EX") == 0)
311 glmode = LM_ST_UNLOCKED;
312 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
313 glmode = LM_ST_DEFERRED;
314 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
315 glmode = LM_ST_SHARED;
316 else
317 return -EINVAL;
318
319 if (gltype > LM_TYPE_JOURNAL)
320 return -EINVAL;
321 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
322 glops = &gfs2_freeze_glops;
323 else
324 glops = gfs2_glops_list[gltype];
325 if (glops == NULL)
326 return -EINVAL;
327 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
328 fs_info(sdp, "demote interface used\n");
329 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
330 if (rv)
331 return rv;
332 gfs2_glock_cb(gl, glmode);
333 gfs2_glock_put(gl);
334 return len;
335}
336
337
338#define GFS2_ATTR(name, mode, show, store) \
339static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
340
341GFS2_ATTR(id, 0444, id_show, NULL);
342GFS2_ATTR(fsname, 0444, fsname_show, NULL);
343GFS2_ATTR(uuid, 0444, uuid_show, NULL);
344GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
345GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
346GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
347GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
348GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
349GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
350GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
351GFS2_ATTR(status, 0400, status_show, NULL);
352
353static struct attribute *gfs2_attrs[] = {
354 &gfs2_attr_id.attr,
355 &gfs2_attr_fsname.attr,
356 &gfs2_attr_uuid.attr,
357 &gfs2_attr_freeze.attr,
358 &gfs2_attr_withdraw.attr,
359 &gfs2_attr_statfs_sync.attr,
360 &gfs2_attr_quota_sync.attr,
361 &gfs2_attr_quota_refresh_user.attr,
362 &gfs2_attr_quota_refresh_group.attr,
363 &gfs2_attr_demote_rq.attr,
364 &gfs2_attr_status.attr,
365 NULL,
366};
367ATTRIBUTE_GROUPS(gfs2);
368
369static void gfs2_sbd_release(struct kobject *kobj)
370{
371 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
372
373 complete(&sdp->sd_kobj_unregister);
374}
375
376static struct kobj_type gfs2_ktype = {
377 .release = gfs2_sbd_release,
378 .default_groups = gfs2_groups,
379 .sysfs_ops = &gfs2_attr_ops,
380};
381
382
383/*
384 * lock_module. Originally from lock_dlm
385 */
386
387static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
388{
389 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
390 return sprintf(buf, "%s\n", ops->lm_proto_name);
391}
392
393static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
394{
395 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
396 ssize_t ret;
397 int val = 0;
398
399 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
400 val = 1;
401 ret = sprintf(buf, "%d\n", val);
402 return ret;
403}
404
405static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
406{
407 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
408 int ret, val;
409
410 ret = kstrtoint(buf, 0, &val);
411 if (ret)
412 return ret;
413
414 if (val == 1)
415 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
416 else if (val == 0) {
417 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
418 smp_mb__after_atomic();
419 gfs2_glock_thaw(sdp);
420 } else {
421 return -EINVAL;
422 }
423 return len;
424}
425
426static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
427{
428 int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
429
430 return sprintf(buf, "%d\n", val);
431}
432
433static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
434{
435 int ret, val;
436
437 ret = kstrtoint(buf, 0, &val);
438 if (ret)
439 return ret;
440
441 if ((val == 1) &&
442 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
443 complete(&sdp->sd_wdack);
444 else
445 return -EINVAL;
446 return len;
447}
448
449static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
450{
451 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
452 return sprintf(buf, "%d\n", ls->ls_first);
453}
454
455static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
456{
457 unsigned first;
458 int rv;
459
460 rv = sscanf(buf, "%u", &first);
461 if (rv != 1 || first > 1)
462 return -EINVAL;
463 rv = wait_for_completion_killable(&sdp->sd_locking_init);
464 if (rv)
465 return rv;
466 spin_lock(&sdp->sd_jindex_spin);
467 rv = -EBUSY;
468 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
469 goto out;
470 rv = -EINVAL;
471 if (sdp->sd_args.ar_spectator)
472 goto out;
473 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
474 goto out;
475 sdp->sd_lockstruct.ls_first = first;
476 rv = 0;
477out:
478 spin_unlock(&sdp->sd_jindex_spin);
479 return rv ? rv : len;
480}
481
482static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
483{
484 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
485 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
486}
487
488int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
489{
490 struct gfs2_jdesc *jd;
491 int rv;
492
493 /* Wait for our primary journal to be initialized */
494 wait_for_completion(&sdp->sd_journal_ready);
495
496 spin_lock(&sdp->sd_jindex_spin);
497 rv = -EBUSY;
498 /**
499 * If we're a spectator, we use journal0, but it's not really ours.
500 * So we need to wait for its recovery too. If we skip it we'd never
501 * queue work to the recovery workqueue, and so its completion would
502 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
503 * permanently stop working.
504 */
505 if (!sdp->sd_jdesc)
506 goto out;
507 if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
508 goto out;
509 rv = -ENOENT;
510 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
511 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
512 continue;
513 rv = gfs2_recover_journal(jd, false);
514 break;
515 }
516out:
517 spin_unlock(&sdp->sd_jindex_spin);
518 return rv;
519}
520
521static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
522{
523 unsigned jid;
524 int rv;
525
526 rv = sscanf(buf, "%u", &jid);
527 if (rv != 1)
528 return -EINVAL;
529
530 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
531 rv = -ESHUTDOWN;
532 goto out;
533 }
534
535 rv = gfs2_recover_set(sdp, jid);
536out:
537 return rv ? rv : len;
538}
539
540static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
541{
542 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
543 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
544}
545
546static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
547{
548 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
549 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
550}
551
552static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
553{
554 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
555}
556
557static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
558{
559 int jid;
560 int rv;
561
562 rv = sscanf(buf, "%d", &jid);
563 if (rv != 1)
564 return -EINVAL;
565 rv = wait_for_completion_killable(&sdp->sd_locking_init);
566 if (rv)
567 return rv;
568 spin_lock(&sdp->sd_jindex_spin);
569 rv = -EINVAL;
570 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
571 goto out;
572 rv = -EBUSY;
573 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
574 goto out;
575 rv = 0;
576 if (sdp->sd_args.ar_spectator && jid > 0)
577 rv = jid = -EINVAL;
578 sdp->sd_lockstruct.ls_jid = jid;
579 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
580 smp_mb__after_atomic();
581 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
582out:
583 spin_unlock(&sdp->sd_jindex_spin);
584 return rv ? rv : len;
585}
586
587#define GDLM_ATTR(_name,_mode,_show,_store) \
588static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
589
590GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
591GDLM_ATTR(block, 0644, block_show, block_store);
592GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store);
593GDLM_ATTR(jid, 0644, jid_show, jid_store);
594GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
595GDLM_ATTR(first_done, 0444, first_done_show, NULL);
596GDLM_ATTR(recover, 0600, NULL, recover_store);
597GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
598GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
599
600static struct attribute *lock_module_attrs[] = {
601 &gdlm_attr_proto_name.attr,
602 &gdlm_attr_block.attr,
603 &gdlm_attr_withdraw.attr,
604 &gdlm_attr_jid.attr,
605 &gdlm_attr_first.attr,
606 &gdlm_attr_first_done.attr,
607 &gdlm_attr_recover.attr,
608 &gdlm_attr_recover_done.attr,
609 &gdlm_attr_recover_status.attr,
610 NULL,
611};
612
613/*
614 * get and set struct gfs2_tune fields
615 */
616
617static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
618{
619 return snprintf(buf, PAGE_SIZE, "%u %u\n",
620 sdp->sd_tune.gt_quota_scale_num,
621 sdp->sd_tune.gt_quota_scale_den);
622}
623
624static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
625 size_t len)
626{
627 struct gfs2_tune *gt = &sdp->sd_tune;
628 unsigned int x, y;
629
630 if (!capable(CAP_SYS_ADMIN))
631 return -EPERM;
632
633 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
634 return -EINVAL;
635
636 spin_lock(>->gt_spin);
637 gt->gt_quota_scale_num = x;
638 gt->gt_quota_scale_den = y;
639 spin_unlock(>->gt_spin);
640 return len;
641}
642
643static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
644 int check_zero, const char *buf, size_t len)
645{
646 struct gfs2_tune *gt = &sdp->sd_tune;
647 unsigned int x;
648 int error;
649
650 if (!capable(CAP_SYS_ADMIN))
651 return -EPERM;
652
653 error = kstrtouint(buf, 0, &x);
654 if (error)
655 return error;
656
657 if (check_zero && !x)
658 return -EINVAL;
659
660 spin_lock(>->gt_spin);
661 *field = x;
662 spin_unlock(>->gt_spin);
663 return len;
664}
665
666#define TUNE_ATTR_3(name, show, store) \
667static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
668
669#define TUNE_ATTR_2(name, store) \
670static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
671{ \
672 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
673} \
674TUNE_ATTR_3(name, name##_show, store)
675
676#define TUNE_ATTR(name, check_zero) \
677static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
678{ \
679 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
680} \
681TUNE_ATTR_2(name, name##_store)
682
683TUNE_ATTR(quota_warn_period, 0);
684TUNE_ATTR(quota_quantum, 0);
685TUNE_ATTR(max_readahead, 0);
686TUNE_ATTR(complain_secs, 0);
687TUNE_ATTR(statfs_slow, 0);
688TUNE_ATTR(new_files_jdata, 0);
689TUNE_ATTR(statfs_quantum, 1);
690TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
691
692static struct attribute *tune_attrs[] = {
693 &tune_attr_quota_warn_period.attr,
694 &tune_attr_quota_quantum.attr,
695 &tune_attr_max_readahead.attr,
696 &tune_attr_complain_secs.attr,
697 &tune_attr_statfs_slow.attr,
698 &tune_attr_statfs_quantum.attr,
699 &tune_attr_quota_scale.attr,
700 &tune_attr_new_files_jdata.attr,
701 NULL,
702};
703
704static const struct attribute_group tune_group = {
705 .name = "tune",
706 .attrs = tune_attrs,
707};
708
709static const struct attribute_group lock_module_group = {
710 .name = "lock_module",
711 .attrs = lock_module_attrs,
712};
713
714int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
715{
716 struct super_block *sb = sdp->sd_vfs;
717 int error;
718 char ro[20];
719 char spectator[20];
720 char *envp[] = { ro, spectator, NULL };
721
722 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
723 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
724
725 init_completion(&sdp->sd_kobj_unregister);
726 sdp->sd_kobj.kset = gfs2_kset;
727 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
728 "%s", sdp->sd_table_name);
729 if (error)
730 goto fail_reg;
731
732 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
733 if (error)
734 goto fail_reg;
735
736 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
737 if (error)
738 goto fail_tune;
739
740 error = sysfs_create_link(&sdp->sd_kobj,
741 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
742 "device");
743 if (error)
744 goto fail_lock_module;
745
746 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
747 return 0;
748
749fail_lock_module:
750 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
751fail_tune:
752 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
753fail_reg:
754 fs_err(sdp, "error %d adding sysfs files\n", error);
755 kobject_put(&sdp->sd_kobj);
756 wait_for_completion(&sdp->sd_kobj_unregister);
757 sb->s_fs_info = NULL;
758 return error;
759}
760
761void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
762{
763 sysfs_remove_link(&sdp->sd_kobj, "device");
764 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
765 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
766 kobject_put(&sdp->sd_kobj);
767 wait_for_completion(&sdp->sd_kobj_unregister);
768}
769
770static int gfs2_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
771{
772 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
773 struct super_block *s = sdp->sd_vfs;
774
775 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
776 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
777 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
778 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
779 if (!uuid_is_null(&s->s_uuid))
780 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
781 return 0;
782}
783
784static const struct kset_uevent_ops gfs2_uevent_ops = {
785 .uevent = gfs2_uevent,
786};
787
788int gfs2_sys_init(void)
789{
790 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
791 if (!gfs2_kset)
792 return -ENOMEM;
793 return 0;
794}
795
796void gfs2_sys_uninit(void)
797{
798 kset_unregister(gfs2_kset);
799}
800
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/sched.h>
10#include <linux/cred.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/module.h>
15#include <linux/kobject.h>
16#include <linux/uaccess.h>
17#include <linux/gfs2_ondisk.h>
18#include <linux/genhd.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "sys.h"
23#include "super.h"
24#include "glock.h"
25#include "quota.h"
26#include "util.h"
27#include "glops.h"
28#include "recovery.h"
29
30struct gfs2_attr {
31 struct attribute attr;
32 ssize_t (*show)(struct gfs2_sbd *, char *);
33 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
34};
35
36static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
37 char *buf)
38{
39 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
40 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
41 return a->show ? a->show(sdp, buf) : 0;
42}
43
44static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
45 const char *buf, size_t len)
46{
47 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
48 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
49 return a->store ? a->store(sdp, buf, len) : len;
50}
51
52static const struct sysfs_ops gfs2_attr_ops = {
53 .show = gfs2_attr_show,
54 .store = gfs2_attr_store,
55};
56
57
58static struct kset *gfs2_kset;
59
60static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
61{
62 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
63 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
64}
65
66static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
67{
68 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
69}
70
71static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
72{
73 struct super_block *s = sdp->sd_vfs;
74
75 buf[0] = '\0';
76 if (uuid_is_null(&s->s_uuid))
77 return 0;
78 return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
79}
80
81static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
82{
83 struct super_block *sb = sdp->sd_vfs;
84 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
85
86 return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
87}
88
89static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
90{
91 int error, n;
92
93 error = kstrtoint(buf, 0, &n);
94 if (error)
95 return error;
96
97 if (!capable(CAP_SYS_ADMIN))
98 return -EPERM;
99
100 switch (n) {
101 case 0:
102 error = thaw_super(sdp->sd_vfs);
103 break;
104 case 1:
105 error = freeze_super(sdp->sd_vfs);
106 break;
107 default:
108 return -EINVAL;
109 }
110
111 if (error) {
112 fs_warn(sdp, "freeze %d error %d\n", n, error);
113 return error;
114 }
115
116 return len;
117}
118
119static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
120{
121 unsigned int b = test_bit(SDF_WITHDRAWN, &sdp->sd_flags);
122 return snprintf(buf, PAGE_SIZE, "%u\n", b);
123}
124
125static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
126{
127 int error, val;
128
129 if (!capable(CAP_SYS_ADMIN))
130 return -EPERM;
131
132 error = kstrtoint(buf, 0, &val);
133 if (error)
134 return error;
135
136 if (val != 1)
137 return -EINVAL;
138
139 gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
140
141 return len;
142}
143
144static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
145 size_t len)
146{
147 int error, val;
148
149 if (!capable(CAP_SYS_ADMIN))
150 return -EPERM;
151
152 error = kstrtoint(buf, 0, &val);
153 if (error)
154 return error;
155
156 if (val != 1)
157 return -EINVAL;
158
159 gfs2_statfs_sync(sdp->sd_vfs, 0);
160 return len;
161}
162
163static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
164 size_t len)
165{
166 int error, val;
167
168 if (!capable(CAP_SYS_ADMIN))
169 return -EPERM;
170
171 error = kstrtoint(buf, 0, &val);
172 if (error)
173 return error;
174
175 if (val != 1)
176 return -EINVAL;
177
178 gfs2_quota_sync(sdp->sd_vfs, 0);
179 return len;
180}
181
182static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
183 size_t len)
184{
185 struct kqid qid;
186 int error;
187 u32 id;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EPERM;
191
192 error = kstrtou32(buf, 0, &id);
193 if (error)
194 return error;
195
196 qid = make_kqid(current_user_ns(), USRQUOTA, id);
197 if (!qid_valid(qid))
198 return -EINVAL;
199
200 error = gfs2_quota_refresh(sdp, qid);
201 return error ? error : len;
202}
203
204static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
205 size_t len)
206{
207 struct kqid qid;
208 int error;
209 u32 id;
210
211 if (!capable(CAP_SYS_ADMIN))
212 return -EPERM;
213
214 error = kstrtou32(buf, 0, &id);
215 if (error)
216 return error;
217
218 qid = make_kqid(current_user_ns(), GRPQUOTA, id);
219 if (!qid_valid(qid))
220 return -EINVAL;
221
222 error = gfs2_quota_refresh(sdp, qid);
223 return error ? error : len;
224}
225
226static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
227{
228 struct gfs2_glock *gl;
229 const struct gfs2_glock_operations *glops;
230 unsigned int glmode;
231 unsigned int gltype;
232 unsigned long long glnum;
233 char mode[16];
234 int rv;
235
236 if (!capable(CAP_SYS_ADMIN))
237 return -EPERM;
238
239 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
240 mode);
241 if (rv != 3)
242 return -EINVAL;
243
244 if (strcmp(mode, "EX") == 0)
245 glmode = LM_ST_UNLOCKED;
246 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
247 glmode = LM_ST_DEFERRED;
248 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
249 glmode = LM_ST_SHARED;
250 else
251 return -EINVAL;
252
253 if (gltype > LM_TYPE_JOURNAL)
254 return -EINVAL;
255 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
256 glops = &gfs2_freeze_glops;
257 else
258 glops = gfs2_glops_list[gltype];
259 if (glops == NULL)
260 return -EINVAL;
261 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
262 fs_info(sdp, "demote interface used\n");
263 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
264 if (rv)
265 return rv;
266 gfs2_glock_cb(gl, glmode);
267 gfs2_glock_put(gl);
268 return len;
269}
270
271
272#define GFS2_ATTR(name, mode, show, store) \
273static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
274
275GFS2_ATTR(id, 0444, id_show, NULL);
276GFS2_ATTR(fsname, 0444, fsname_show, NULL);
277GFS2_ATTR(uuid, 0444, uuid_show, NULL);
278GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
279GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
280GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
281GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
282GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
283GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
284GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
285
286static struct attribute *gfs2_attrs[] = {
287 &gfs2_attr_id.attr,
288 &gfs2_attr_fsname.attr,
289 &gfs2_attr_uuid.attr,
290 &gfs2_attr_freeze.attr,
291 &gfs2_attr_withdraw.attr,
292 &gfs2_attr_statfs_sync.attr,
293 &gfs2_attr_quota_sync.attr,
294 &gfs2_attr_quota_refresh_user.attr,
295 &gfs2_attr_quota_refresh_group.attr,
296 &gfs2_attr_demote_rq.attr,
297 NULL,
298};
299ATTRIBUTE_GROUPS(gfs2);
300
301static void gfs2_sbd_release(struct kobject *kobj)
302{
303 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
304
305 free_sbd(sdp);
306}
307
308static struct kobj_type gfs2_ktype = {
309 .release = gfs2_sbd_release,
310 .default_groups = gfs2_groups,
311 .sysfs_ops = &gfs2_attr_ops,
312};
313
314
315/*
316 * lock_module. Originally from lock_dlm
317 */
318
319static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
320{
321 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
322 return sprintf(buf, "%s\n", ops->lm_proto_name);
323}
324
325static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
326{
327 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
328 ssize_t ret;
329 int val = 0;
330
331 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
332 val = 1;
333 ret = sprintf(buf, "%d\n", val);
334 return ret;
335}
336
337static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
338{
339 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
340 int ret, val;
341
342 ret = kstrtoint(buf, 0, &val);
343 if (ret)
344 return ret;
345
346 if (val == 1)
347 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
348 else if (val == 0) {
349 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
350 smp_mb__after_atomic();
351 gfs2_glock_thaw(sdp);
352 } else {
353 return -EINVAL;
354 }
355 return len;
356}
357
358static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
359{
360 int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
361
362 return sprintf(buf, "%d\n", val);
363}
364
365static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
366{
367 int ret, val;
368
369 ret = kstrtoint(buf, 0, &val);
370 if (ret)
371 return ret;
372
373 if ((val == 1) &&
374 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
375 complete(&sdp->sd_wdack);
376 else
377 return -EINVAL;
378 return len;
379}
380
381static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
382{
383 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
384 return sprintf(buf, "%d\n", ls->ls_first);
385}
386
387static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
388{
389 unsigned first;
390 int rv;
391
392 rv = sscanf(buf, "%u", &first);
393 if (rv != 1 || first > 1)
394 return -EINVAL;
395 rv = wait_for_completion_killable(&sdp->sd_locking_init);
396 if (rv)
397 return rv;
398 spin_lock(&sdp->sd_jindex_spin);
399 rv = -EBUSY;
400 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
401 goto out;
402 rv = -EINVAL;
403 if (sdp->sd_args.ar_spectator)
404 goto out;
405 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
406 goto out;
407 sdp->sd_lockstruct.ls_first = first;
408 rv = 0;
409out:
410 spin_unlock(&sdp->sd_jindex_spin);
411 return rv ? rv : len;
412}
413
414static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
415{
416 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
417 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
418}
419
420int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
421{
422 struct gfs2_jdesc *jd;
423 int rv;
424
425 /* Wait for our primary journal to be initialized */
426 wait_for_completion(&sdp->sd_journal_ready);
427
428 spin_lock(&sdp->sd_jindex_spin);
429 rv = -EBUSY;
430 /**
431 * If we're a spectator, we use journal0, but it's not really ours.
432 * So we need to wait for its recovery too. If we skip it we'd never
433 * queue work to the recovery workqueue, and so its completion would
434 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
435 * permanently stop working.
436 */
437 if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
438 goto out;
439 rv = -ENOENT;
440 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
441 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
442 continue;
443 rv = gfs2_recover_journal(jd, false);
444 break;
445 }
446out:
447 spin_unlock(&sdp->sd_jindex_spin);
448 return rv;
449}
450
451static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
452{
453 unsigned jid;
454 int rv;
455
456 rv = sscanf(buf, "%u", &jid);
457 if (rv != 1)
458 return -EINVAL;
459
460 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
461 rv = -ESHUTDOWN;
462 goto out;
463 }
464
465 rv = gfs2_recover_set(sdp, jid);
466out:
467 return rv ? rv : len;
468}
469
470static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
471{
472 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
473 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
474}
475
476static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
477{
478 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
479 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
480}
481
482static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
483{
484 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
485}
486
487static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
488{
489 int jid;
490 int rv;
491
492 rv = sscanf(buf, "%d", &jid);
493 if (rv != 1)
494 return -EINVAL;
495 rv = wait_for_completion_killable(&sdp->sd_locking_init);
496 if (rv)
497 return rv;
498 spin_lock(&sdp->sd_jindex_spin);
499 rv = -EINVAL;
500 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
501 goto out;
502 rv = -EBUSY;
503 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
504 goto out;
505 rv = 0;
506 if (sdp->sd_args.ar_spectator && jid > 0)
507 rv = jid = -EINVAL;
508 sdp->sd_lockstruct.ls_jid = jid;
509 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
510 smp_mb__after_atomic();
511 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
512out:
513 spin_unlock(&sdp->sd_jindex_spin);
514 return rv ? rv : len;
515}
516
517#define GDLM_ATTR(_name,_mode,_show,_store) \
518static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
519
520GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
521GDLM_ATTR(block, 0644, block_show, block_store);
522GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store);
523GDLM_ATTR(jid, 0644, jid_show, jid_store);
524GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
525GDLM_ATTR(first_done, 0444, first_done_show, NULL);
526GDLM_ATTR(recover, 0600, NULL, recover_store);
527GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
528GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
529
530static struct attribute *lock_module_attrs[] = {
531 &gdlm_attr_proto_name.attr,
532 &gdlm_attr_block.attr,
533 &gdlm_attr_withdraw.attr,
534 &gdlm_attr_jid.attr,
535 &gdlm_attr_first.attr,
536 &gdlm_attr_first_done.attr,
537 &gdlm_attr_recover.attr,
538 &gdlm_attr_recover_done.attr,
539 &gdlm_attr_recover_status.attr,
540 NULL,
541};
542
543/*
544 * get and set struct gfs2_tune fields
545 */
546
547static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
548{
549 return snprintf(buf, PAGE_SIZE, "%u %u\n",
550 sdp->sd_tune.gt_quota_scale_num,
551 sdp->sd_tune.gt_quota_scale_den);
552}
553
554static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
555 size_t len)
556{
557 struct gfs2_tune *gt = &sdp->sd_tune;
558 unsigned int x, y;
559
560 if (!capable(CAP_SYS_ADMIN))
561 return -EPERM;
562
563 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
564 return -EINVAL;
565
566 spin_lock(>->gt_spin);
567 gt->gt_quota_scale_num = x;
568 gt->gt_quota_scale_den = y;
569 spin_unlock(>->gt_spin);
570 return len;
571}
572
573static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
574 int check_zero, const char *buf, size_t len)
575{
576 struct gfs2_tune *gt = &sdp->sd_tune;
577 unsigned int x;
578 int error;
579
580 if (!capable(CAP_SYS_ADMIN))
581 return -EPERM;
582
583 error = kstrtouint(buf, 0, &x);
584 if (error)
585 return error;
586
587 if (check_zero && !x)
588 return -EINVAL;
589
590 spin_lock(>->gt_spin);
591 *field = x;
592 spin_unlock(>->gt_spin);
593 return len;
594}
595
596#define TUNE_ATTR_3(name, show, store) \
597static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
598
599#define TUNE_ATTR_2(name, store) \
600static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
601{ \
602 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
603} \
604TUNE_ATTR_3(name, name##_show, store)
605
606#define TUNE_ATTR(name, check_zero) \
607static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
608{ \
609 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
610} \
611TUNE_ATTR_2(name, name##_store)
612
613TUNE_ATTR(quota_warn_period, 0);
614TUNE_ATTR(quota_quantum, 0);
615TUNE_ATTR(max_readahead, 0);
616TUNE_ATTR(complain_secs, 0);
617TUNE_ATTR(statfs_slow, 0);
618TUNE_ATTR(new_files_jdata, 0);
619TUNE_ATTR(statfs_quantum, 1);
620TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
621
622static struct attribute *tune_attrs[] = {
623 &tune_attr_quota_warn_period.attr,
624 &tune_attr_quota_quantum.attr,
625 &tune_attr_max_readahead.attr,
626 &tune_attr_complain_secs.attr,
627 &tune_attr_statfs_slow.attr,
628 &tune_attr_statfs_quantum.attr,
629 &tune_attr_quota_scale.attr,
630 &tune_attr_new_files_jdata.attr,
631 NULL,
632};
633
634static const struct attribute_group tune_group = {
635 .name = "tune",
636 .attrs = tune_attrs,
637};
638
639static const struct attribute_group lock_module_group = {
640 .name = "lock_module",
641 .attrs = lock_module_attrs,
642};
643
644int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
645{
646 struct super_block *sb = sdp->sd_vfs;
647 int error;
648 char ro[20];
649 char spectator[20];
650 char *envp[] = { ro, spectator, NULL };
651
652 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
653 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
654
655 sdp->sd_kobj.kset = gfs2_kset;
656 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
657 "%s", sdp->sd_table_name);
658 if (error)
659 goto fail_reg;
660
661 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
662 if (error)
663 goto fail_reg;
664
665 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
666 if (error)
667 goto fail_tune;
668
669 error = sysfs_create_link(&sdp->sd_kobj,
670 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
671 "device");
672 if (error)
673 goto fail_lock_module;
674
675 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
676 return 0;
677
678fail_lock_module:
679 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
680fail_tune:
681 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
682fail_reg:
683 fs_err(sdp, "error %d adding sysfs files\n", error);
684 kobject_put(&sdp->sd_kobj);
685 sb->s_fs_info = NULL;
686 return error;
687}
688
689void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
690{
691 sysfs_remove_link(&sdp->sd_kobj, "device");
692 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
693 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
694 kobject_put(&sdp->sd_kobj);
695}
696
697static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
698 struct kobj_uevent_env *env)
699{
700 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
701 struct super_block *s = sdp->sd_vfs;
702
703 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
704 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
705 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
706 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
707 if (!uuid_is_null(&s->s_uuid))
708 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
709 return 0;
710}
711
712static const struct kset_uevent_ops gfs2_uevent_ops = {
713 .uevent = gfs2_uevent,
714};
715
716int gfs2_sys_init(void)
717{
718 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
719 if (!gfs2_kset)
720 return -ENOMEM;
721 return 0;
722}
723
724void gfs2_sys_uninit(void)
725{
726 kset_unregister(gfs2_kset);
727}
728