1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
31 struct attribute attr;
32 ssize_t (*show)(struct gfs2_sbd *, char *);
33 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
36 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
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;
44 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
45 const char *buf, size_t len)
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;
52 static const struct sysfs_ops gfs2_attr_ops = {
53 .show = gfs2_attr_show,
54 .store = gfs2_attr_store,
58 static struct kset *gfs2_kset;
60 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
62 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
63 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
66 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
68 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
71 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
73 struct super_block *s = sdp->sd_vfs;
76 if (uuid_is_null(&s->s_uuid))
78 return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
81 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
83 struct super_block *sb = sdp->sd_vfs;
84 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
86 return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
89 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
93 error = kstrtoint(buf, 0, &n);
97 if (!capable(CAP_SYS_ADMIN))
102 error = thaw_super(sdp->sd_vfs);
105 error = freeze_super(sdp->sd_vfs);
112 fs_warn(sdp, "freeze %d error %d\n", n, error);
119 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
121 unsigned int b = test_bit(SDF_WITHDRAWN, &sdp->sd_flags);
122 return snprintf(buf, PAGE_SIZE, "%u\n", b);
125 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
129 if (!capable(CAP_SYS_ADMIN))
132 error = kstrtoint(buf, 0, &val);
139 gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
144 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
149 if (!capable(CAP_SYS_ADMIN))
152 error = kstrtoint(buf, 0, &val);
159 gfs2_statfs_sync(sdp->sd_vfs, 0);
163 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
168 if (!capable(CAP_SYS_ADMIN))
171 error = kstrtoint(buf, 0, &val);
178 gfs2_quota_sync(sdp->sd_vfs, 0);
182 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
189 if (!capable(CAP_SYS_ADMIN))
192 error = kstrtou32(buf, 0, &id);
196 qid = make_kqid(current_user_ns(), USRQUOTA, id);
200 error = gfs2_quota_refresh(sdp, qid);
201 return error ? error : len;
204 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
211 if (!capable(CAP_SYS_ADMIN))
214 error = kstrtou32(buf, 0, &id);
218 qid = make_kqid(current_user_ns(), GRPQUOTA, id);
222 error = gfs2_quota_refresh(sdp, qid);
223 return error ? error : len;
226 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
228 struct gfs2_glock *gl;
229 const struct gfs2_glock_operations *glops;
232 unsigned long long glnum;
236 if (!capable(CAP_SYS_ADMIN))
239 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
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;
253 if (gltype > LM_TYPE_JOURNAL)
255 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
256 glops = &gfs2_freeze_glops;
258 glops = gfs2_glops_list[gltype];
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);
266 gfs2_glock_cb(gl, glmode);
272 #define GFS2_ATTR(name, mode, show, store) \
273 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
275 GFS2_ATTR(id, 0444, id_show, NULL);
276 GFS2_ATTR(fsname, 0444, fsname_show, NULL);
277 GFS2_ATTR(uuid, 0444, uuid_show, NULL);
278 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
279 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
280 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
281 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
282 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
283 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
284 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
286 static struct attribute *gfs2_attrs[] = {
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,
300 static void gfs2_sbd_release(struct kobject *kobj)
302 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
307 static struct kobj_type gfs2_ktype = {
308 .release = gfs2_sbd_release,
309 .default_attrs = gfs2_attrs,
310 .sysfs_ops = &gfs2_attr_ops,
315 * lock_module. Originally from lock_dlm
318 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
320 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
321 return sprintf(buf, "%s\n", ops->lm_proto_name);
324 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
326 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
330 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
332 ret = sprintf(buf, "%d\n", val);
336 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
338 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
341 ret = kstrtoint(buf, 0, &val);
346 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
348 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
349 smp_mb__after_atomic();
350 gfs2_glock_thaw(sdp);
357 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
359 int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
361 return sprintf(buf, "%d\n", val);
364 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
368 ret = kstrtoint(buf, 0, &val);
373 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
374 complete(&sdp->sd_wdack);
380 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
382 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
383 return sprintf(buf, "%d\n", ls->ls_first);
386 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
391 rv = sscanf(buf, "%u", &first);
392 if (rv != 1 || first > 1)
394 rv = wait_for_completion_killable(&sdp->sd_locking_init);
397 spin_lock(&sdp->sd_jindex_spin);
399 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
402 if (sdp->sd_args.ar_spectator)
404 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
406 sdp->sd_lockstruct.ls_first = first;
409 spin_unlock(&sdp->sd_jindex_spin);
410 return rv ? rv : len;
413 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
415 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
416 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
419 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
421 struct gfs2_jdesc *jd;
424 /* Wait for our primary journal to be initialized */
425 wait_for_completion(&sdp->sd_journal_ready);
427 spin_lock(&sdp->sd_jindex_spin);
430 * If we're a spectator, we use journal0, but it's not really ours.
431 * So we need to wait for its recovery too. If we skip it we'd never
432 * queue work to the recovery workqueue, and so its completion would
433 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
434 * permanently stop working.
436 if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
439 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
440 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
442 rv = gfs2_recover_journal(jd, false);
446 spin_unlock(&sdp->sd_jindex_spin);
450 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
455 rv = sscanf(buf, "%u", &jid);
459 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
464 rv = gfs2_recover_set(sdp, jid);
466 return rv ? rv : len;
469 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
471 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
472 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
475 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
477 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
478 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
481 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
483 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
486 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
491 rv = sscanf(buf, "%d", &jid);
494 rv = wait_for_completion_killable(&sdp->sd_locking_init);
497 spin_lock(&sdp->sd_jindex_spin);
499 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
502 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
505 if (sdp->sd_args.ar_spectator && jid > 0)
507 sdp->sd_lockstruct.ls_jid = jid;
508 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
509 smp_mb__after_atomic();
510 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
512 spin_unlock(&sdp->sd_jindex_spin);
513 return rv ? rv : len;
516 #define GDLM_ATTR(_name,_mode,_show,_store) \
517 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
519 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
520 GDLM_ATTR(block, 0644, block_show, block_store);
521 GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store);
522 GDLM_ATTR(jid, 0644, jid_show, jid_store);
523 GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
524 GDLM_ATTR(first_done, 0444, first_done_show, NULL);
525 GDLM_ATTR(recover, 0600, NULL, recover_store);
526 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
527 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
529 static struct attribute *lock_module_attrs[] = {
530 &gdlm_attr_proto_name.attr,
531 &gdlm_attr_block.attr,
532 &gdlm_attr_withdraw.attr,
534 &gdlm_attr_first.attr,
535 &gdlm_attr_first_done.attr,
536 &gdlm_attr_recover.attr,
537 &gdlm_attr_recover_done.attr,
538 &gdlm_attr_recover_status.attr,
543 * get and set struct gfs2_tune fields
546 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
548 return snprintf(buf, PAGE_SIZE, "%u %u\n",
549 sdp->sd_tune.gt_quota_scale_num,
550 sdp->sd_tune.gt_quota_scale_den);
553 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
556 struct gfs2_tune *gt = &sdp->sd_tune;
559 if (!capable(CAP_SYS_ADMIN))
562 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
565 spin_lock(>->gt_spin);
566 gt->gt_quota_scale_num = x;
567 gt->gt_quota_scale_den = y;
568 spin_unlock(>->gt_spin);
572 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
573 int check_zero, const char *buf, size_t len)
575 struct gfs2_tune *gt = &sdp->sd_tune;
579 if (!capable(CAP_SYS_ADMIN))
582 error = kstrtouint(buf, 0, &x);
586 if (check_zero && !x)
589 spin_lock(>->gt_spin);
591 spin_unlock(>->gt_spin);
595 #define TUNE_ATTR_3(name, show, store) \
596 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
598 #define TUNE_ATTR_2(name, store) \
599 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
601 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
603 TUNE_ATTR_3(name, name##_show, store)
605 #define TUNE_ATTR(name, check_zero) \
606 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
608 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
610 TUNE_ATTR_2(name, name##_store)
612 TUNE_ATTR(quota_warn_period, 0);
613 TUNE_ATTR(quota_quantum, 0);
614 TUNE_ATTR(max_readahead, 0);
615 TUNE_ATTR(complain_secs, 0);
616 TUNE_ATTR(statfs_slow, 0);
617 TUNE_ATTR(new_files_jdata, 0);
618 TUNE_ATTR(statfs_quantum, 1);
619 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
621 static struct attribute *tune_attrs[] = {
622 &tune_attr_quota_warn_period.attr,
623 &tune_attr_quota_quantum.attr,
624 &tune_attr_max_readahead.attr,
625 &tune_attr_complain_secs.attr,
626 &tune_attr_statfs_slow.attr,
627 &tune_attr_statfs_quantum.attr,
628 &tune_attr_quota_scale.attr,
629 &tune_attr_new_files_jdata.attr,
633 static const struct attribute_group tune_group = {
638 static const struct attribute_group lock_module_group = {
639 .name = "lock_module",
640 .attrs = lock_module_attrs,
643 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
645 struct super_block *sb = sdp->sd_vfs;
649 char *envp[] = { ro, spectator, NULL };
651 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
652 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
654 sdp->sd_kobj.kset = gfs2_kset;
655 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
656 "%s", sdp->sd_table_name);
660 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
664 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
668 error = sysfs_create_link(&sdp->sd_kobj,
669 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
672 goto fail_lock_module;
674 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
678 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
680 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
682 fs_err(sdp, "error %d adding sysfs files\n", error);
683 kobject_put(&sdp->sd_kobj);
684 sb->s_fs_info = NULL;
688 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
690 sysfs_remove_link(&sdp->sd_kobj, "device");
691 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
692 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
693 kobject_put(&sdp->sd_kobj);
696 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
697 struct kobj_uevent_env *env)
699 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
700 struct super_block *s = sdp->sd_vfs;
702 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
703 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
704 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
705 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
706 if (!uuid_is_null(&s->s_uuid))
707 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
711 static const struct kset_uevent_ops gfs2_uevent_ops = {
712 .uevent = gfs2_uevent,
715 int gfs2_sys_init(void)
717 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
723 void gfs2_sys_uninit(void)
725 kset_unregister(gfs2_kset);