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->gt_spin);
572	gt->gt_quota_scale_num = x;
573	gt->gt_quota_scale_den = y;
574	spin_unlock(&gt->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->gt_spin);
596	*field = x;
597	spin_unlock(&gt->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