xref: /openbmc/linux/fs/gfs2/sys.c (revision b9dd2add) 
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 
30 struct 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 
36 static 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 
44 static 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 
52 static const struct sysfs_ops gfs2_attr_ops = {
53 	.show  = gfs2_attr_show,
54 	.store = gfs2_attr_store,
55 };
56 
57 
58 static struct kset *gfs2_kset;
59 
60 static 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 
66 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
67 {
68 	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
69 }
70 
71 static 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 
81 static 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 
89 static 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 
119 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
120 {
121 	unsigned int b = gfs2_withdrawn(sdp);
122 	return snprintf(buf, PAGE_SIZE, "%u\n", b);
123 }
124 
125 static 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(sdp, "withdrawing from cluster at user's request\n");
140 	gfs2_withdraw(sdp);
141 
142 	return len;
143 }
144 
145 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
146 				 size_t len)
147 {
148 	int error, val;
149 
150 	if (!capable(CAP_SYS_ADMIN))
151 		return -EPERM;
152 
153 	error = kstrtoint(buf, 0, &val);
154 	if (error)
155 		return error;
156 
157 	if (val != 1)
158 		return -EINVAL;
159 
160 	gfs2_statfs_sync(sdp->sd_vfs, 0);
161 	return len;
162 }
163 
164 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
165 				size_t len)
166 {
167 	int error, val;
168 
169 	if (!capable(CAP_SYS_ADMIN))
170 		return -EPERM;
171 
172 	error = kstrtoint(buf, 0, &val);
173 	if (error)
174 		return error;
175 
176 	if (val != 1)
177 		return -EINVAL;
178 
179 	gfs2_quota_sync(sdp->sd_vfs, 0);
180 	return len;
181 }
182 
183 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
184 					size_t len)
185 {
186 	struct kqid qid;
187 	int error;
188 	u32 id;
189 
190 	if (!capable(CAP_SYS_ADMIN))
191 		return -EPERM;
192 
193 	error = kstrtou32(buf, 0, &id);
194 	if (error)
195 		return error;
196 
197 	qid = make_kqid(current_user_ns(), USRQUOTA, id);
198 	if (!qid_valid(qid))
199 		return -EINVAL;
200 
201 	error = gfs2_quota_refresh(sdp, qid);
202 	return error ? error : len;
203 }
204 
205 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
206 					 size_t len)
207 {
208 	struct kqid qid;
209 	int error;
210 	u32 id;
211 
212 	if (!capable(CAP_SYS_ADMIN))
213 		return -EPERM;
214 
215 	error = kstrtou32(buf, 0, &id);
216 	if (error)
217 		return error;
218 
219 	qid = make_kqid(current_user_ns(), GRPQUOTA, id);
220 	if (!qid_valid(qid))
221 		return -EINVAL;
222 
223 	error = gfs2_quota_refresh(sdp, qid);
224 	return error ? error : len;
225 }
226 
227 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
228 {
229 	struct gfs2_glock *gl;
230 	const struct gfs2_glock_operations *glops;
231 	unsigned int glmode;
232 	unsigned int gltype;
233 	unsigned long long glnum;
234 	char mode[16];
235 	int rv;
236 
237 	if (!capable(CAP_SYS_ADMIN))
238 		return -EPERM;
239 
240 	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
241 		    mode);
242 	if (rv != 3)
243 		return -EINVAL;
244 
245 	if (strcmp(mode, "EX") == 0)
246 		glmode = LM_ST_UNLOCKED;
247 	else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
248 		glmode = LM_ST_DEFERRED;
249 	else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
250 		glmode = LM_ST_SHARED;
251 	else
252 		return -EINVAL;
253 
254 	if (gltype > LM_TYPE_JOURNAL)
255 		return -EINVAL;
256 	if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
257 		glops = &gfs2_freeze_glops;
258 	else
259 		glops = gfs2_glops_list[gltype];
260 	if (glops == NULL)
261 		return -EINVAL;
262 	if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
263 		fs_info(sdp, "demote interface used\n");
264 	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
265 	if (rv)
266 		return rv;
267 	gfs2_glock_cb(gl, glmode);
268 	gfs2_glock_put(gl);
269 	return len;
270 }
271 
272 
273 #define GFS2_ATTR(name, mode, show, store) \
274 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
275 
276 GFS2_ATTR(id,                  0444, id_show,       NULL);
277 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
278 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
279 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
280 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
281 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
282 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
283 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
284 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
285 GFS2_ATTR(demote_rq,           0200, NULL,	    demote_rq_store);
286 
287 static struct attribute *gfs2_attrs[] = {
288 	&gfs2_attr_id.attr,
289 	&gfs2_attr_fsname.attr,
290 	&gfs2_attr_uuid.attr,
291 	&gfs2_attr_freeze.attr,
292 	&gfs2_attr_withdraw.attr,
293 	&gfs2_attr_statfs_sync.attr,
294 	&gfs2_attr_quota_sync.attr,
295 	&gfs2_attr_quota_refresh_user.attr,
296 	&gfs2_attr_quota_refresh_group.attr,
297 	&gfs2_attr_demote_rq.attr,
298 	NULL,
299 };
300 ATTRIBUTE_GROUPS(gfs2);
301 
302 static void gfs2_sbd_release(struct kobject *kobj)
303 {
304 	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
305 
306 	complete(&sdp->sd_kobj_unregister);
307 }
308 
309 static struct kobj_type gfs2_ktype = {
310 	.release = gfs2_sbd_release,
311 	.default_groups = gfs2_groups,
312 	.sysfs_ops     = &gfs2_attr_ops,
313 };
314 
315 
316 /*
317  * lock_module. Originally from lock_dlm
318  */
319 
320 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
321 {
322 	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
323 	return sprintf(buf, "%s\n", ops->lm_proto_name);
324 }
325 
326 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
327 {
328 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
329 	ssize_t ret;
330 	int val = 0;
331 
332 	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
333 		val = 1;
334 	ret = sprintf(buf, "%d\n", val);
335 	return ret;
336 }
337 
338 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
339 {
340 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
341 	int ret, val;
342 
343 	ret = kstrtoint(buf, 0, &val);
344 	if (ret)
345 		return ret;
346 
347 	if (val == 1)
348 		set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
349 	else if (val == 0) {
350 		clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
351 		smp_mb__after_atomic();
352 		gfs2_glock_thaw(sdp);
353 	} else {
354 		return -EINVAL;
355 	}
356 	return len;
357 }
358 
359 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
360 {
361 	int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
362 
363 	return sprintf(buf, "%d\n", val);
364 }
365 
366 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
367 {
368 	int ret, val;
369 
370 	ret = kstrtoint(buf, 0, &val);
371 	if (ret)
372 		return ret;
373 
374 	if ((val == 1) &&
375 	    !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
376 		complete(&sdp->sd_wdack);
377 	else
378 		return -EINVAL;
379 	return len;
380 }
381 
382 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
383 {
384 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
385 	return sprintf(buf, "%d\n", ls->ls_first);
386 }
387 
388 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
389 {
390 	unsigned first;
391 	int rv;
392 
393 	rv = sscanf(buf, "%u", &first);
394 	if (rv != 1 || first > 1)
395 		return -EINVAL;
396 	rv = wait_for_completion_killable(&sdp->sd_locking_init);
397 	if (rv)
398 		return rv;
399 	spin_lock(&sdp->sd_jindex_spin);
400 	rv = -EBUSY;
401 	if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
402 		goto out;
403 	rv = -EINVAL;
404 	if (sdp->sd_args.ar_spectator)
405 		goto out;
406 	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
407 		goto out;
408 	sdp->sd_lockstruct.ls_first = first;
409 	rv = 0;
410 out:
411         spin_unlock(&sdp->sd_jindex_spin);
412         return rv ? rv : len;
413 }
414 
415 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
416 {
417 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
418 	return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
419 }
420 
421 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
422 {
423 	struct gfs2_jdesc *jd;
424 	int rv;
425 
426 	/* Wait for our primary journal to be initialized */
427 	wait_for_completion(&sdp->sd_journal_ready);
428 
429 	spin_lock(&sdp->sd_jindex_spin);
430 	rv = -EBUSY;
431 	/**
432 	 * If we're a spectator, we use journal0, but it's not really ours.
433 	 * So we need to wait for its recovery too. If we skip it we'd never
434 	 * queue work to the recovery workqueue, and so its completion would
435 	 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
436 	 * permanently stop working.
437 	 */
438 	if (!sdp->sd_jdesc)
439 		goto out;
440 	if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
441 		goto out;
442 	rv = -ENOENT;
443 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
444 		if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
445 			continue;
446 		rv = gfs2_recover_journal(jd, false);
447 		break;
448 	}
449 out:
450 	spin_unlock(&sdp->sd_jindex_spin);
451 	return rv;
452 }
453 
454 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
455 {
456 	unsigned jid;
457 	int rv;
458 
459 	rv = sscanf(buf, "%u", &jid);
460 	if (rv != 1)
461 		return -EINVAL;
462 
463 	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
464 		rv = -ESHUTDOWN;
465 		goto out;
466 	}
467 
468 	rv = gfs2_recover_set(sdp, jid);
469 out:
470 	return rv ? rv : len;
471 }
472 
473 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
474 {
475 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
476 	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
477 }
478 
479 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
480 {
481 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
482 	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
483 }
484 
485 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
486 {
487 	return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
488 }
489 
490 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
491 {
492         int jid;
493 	int rv;
494 
495 	rv = sscanf(buf, "%d", &jid);
496 	if (rv != 1)
497 		return -EINVAL;
498 	rv = wait_for_completion_killable(&sdp->sd_locking_init);
499 	if (rv)
500 		return rv;
501 	spin_lock(&sdp->sd_jindex_spin);
502 	rv = -EINVAL;
503 	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
504 		goto out;
505 	rv = -EBUSY;
506 	if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
507 		goto out;
508 	rv = 0;
509 	if (sdp->sd_args.ar_spectator && jid > 0)
510 		rv = jid = -EINVAL;
511 	sdp->sd_lockstruct.ls_jid = jid;
512 	clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
513 	smp_mb__after_atomic();
514 	wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
515 out:
516 	spin_unlock(&sdp->sd_jindex_spin);
517 	return rv ? rv : len;
518 }
519 
520 #define GDLM_ATTR(_name,_mode,_show,_store) \
521 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
522 
523 GDLM_ATTR(proto_name,		0444, proto_name_show,		NULL);
524 GDLM_ATTR(block,		0644, block_show,		block_store);
525 GDLM_ATTR(withdraw,		0644, wdack_show,		wdack_store);
526 GDLM_ATTR(jid,			0644, jid_show,			jid_store);
527 GDLM_ATTR(first,		0644, lkfirst_show,		lkfirst_store);
528 GDLM_ATTR(first_done,		0444, first_done_show,		NULL);
529 GDLM_ATTR(recover,		0600, NULL,			recover_store);
530 GDLM_ATTR(recover_done,		0444, recover_done_show,	NULL);
531 GDLM_ATTR(recover_status,	0444, recover_status_show,	NULL);
532 
533 static struct attribute *lock_module_attrs[] = {
534 	&gdlm_attr_proto_name.attr,
535 	&gdlm_attr_block.attr,
536 	&gdlm_attr_withdraw.attr,
537 	&gdlm_attr_jid.attr,
538 	&gdlm_attr_first.attr,
539 	&gdlm_attr_first_done.attr,
540 	&gdlm_attr_recover.attr,
541 	&gdlm_attr_recover_done.attr,
542 	&gdlm_attr_recover_status.attr,
543 	NULL,
544 };
545 
546 /*
547  * get and set struct gfs2_tune fields
548  */
549 
550 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
551 {
552 	return snprintf(buf, PAGE_SIZE, "%u %u\n",
553 			sdp->sd_tune.gt_quota_scale_num,
554 			sdp->sd_tune.gt_quota_scale_den);
555 }
556 
557 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
558 				 size_t len)
559 {
560 	struct gfs2_tune *gt = &sdp->sd_tune;
561 	unsigned int x, y;
562 
563 	if (!capable(CAP_SYS_ADMIN))
564 		return -EPERM;
565 
566 	if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
567 		return -EINVAL;
568 
569 	spin_lock(&gt->gt_spin);
570 	gt->gt_quota_scale_num = x;
571 	gt->gt_quota_scale_den = y;
572 	spin_unlock(&gt->gt_spin);
573 	return len;
574 }
575 
576 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
577 			int check_zero, const char *buf, size_t len)
578 {
579 	struct gfs2_tune *gt = &sdp->sd_tune;
580 	unsigned int x;
581 	int error;
582 
583 	if (!capable(CAP_SYS_ADMIN))
584 		return -EPERM;
585 
586 	error = kstrtouint(buf, 0, &x);
587 	if (error)
588 		return error;
589 
590 	if (check_zero && !x)
591 		return -EINVAL;
592 
593 	spin_lock(&gt->gt_spin);
594 	*field = x;
595 	spin_unlock(&gt->gt_spin);
596 	return len;
597 }
598 
599 #define TUNE_ATTR_3(name, show, store)                                        \
600 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
601 
602 #define TUNE_ATTR_2(name, store)                                              \
603 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
604 {                                                                             \
605 	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
606 }                                                                             \
607 TUNE_ATTR_3(name, name##_show, store)
608 
609 #define TUNE_ATTR(name, check_zero)                                           \
610 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
611 {                                                                             \
612 	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
613 }                                                                             \
614 TUNE_ATTR_2(name, name##_store)
615 
616 TUNE_ATTR(quota_warn_period, 0);
617 TUNE_ATTR(quota_quantum, 0);
618 TUNE_ATTR(max_readahead, 0);
619 TUNE_ATTR(complain_secs, 0);
620 TUNE_ATTR(statfs_slow, 0);
621 TUNE_ATTR(new_files_jdata, 0);
622 TUNE_ATTR(statfs_quantum, 1);
623 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
624 
625 static struct attribute *tune_attrs[] = {
626 	&tune_attr_quota_warn_period.attr,
627 	&tune_attr_quota_quantum.attr,
628 	&tune_attr_max_readahead.attr,
629 	&tune_attr_complain_secs.attr,
630 	&tune_attr_statfs_slow.attr,
631 	&tune_attr_statfs_quantum.attr,
632 	&tune_attr_quota_scale.attr,
633 	&tune_attr_new_files_jdata.attr,
634 	NULL,
635 };
636 
637 static const struct attribute_group tune_group = {
638 	.name = "tune",
639 	.attrs = tune_attrs,
640 };
641 
642 static const struct attribute_group lock_module_group = {
643 	.name = "lock_module",
644 	.attrs = lock_module_attrs,
645 };
646 
647 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
648 {
649 	struct super_block *sb = sdp->sd_vfs;
650 	int error;
651 	char ro[20];
652 	char spectator[20];
653 	char *envp[] = { ro, spectator, NULL };
654 
655 	sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
656 	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
657 
658 	init_completion(&sdp->sd_kobj_unregister);
659 	sdp->sd_kobj.kset = gfs2_kset;
660 	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
661 				     "%s", sdp->sd_table_name);
662 	if (error)
663 		goto fail_reg;
664 
665 	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
666 	if (error)
667 		goto fail_reg;
668 
669 	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
670 	if (error)
671 		goto fail_tune;
672 
673 	error = sysfs_create_link(&sdp->sd_kobj,
674 				  &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
675 				  "device");
676 	if (error)
677 		goto fail_lock_module;
678 
679 	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
680 	return 0;
681 
682 fail_lock_module:
683 	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
684 fail_tune:
685 	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
686 fail_reg:
687 	fs_err(sdp, "error %d adding sysfs files\n", error);
688 	kobject_put(&sdp->sd_kobj);
689 	wait_for_completion(&sdp->sd_kobj_unregister);
690 	sb->s_fs_info = NULL;
691 	return error;
692 }
693 
694 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
695 {
696 	sysfs_remove_link(&sdp->sd_kobj, "device");
697 	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
698 	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
699 	kobject_put(&sdp->sd_kobj);
700 	wait_for_completion(&sdp->sd_kobj_unregister);
701 }
702 
703 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
704 		       struct kobj_uevent_env *env)
705 {
706 	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
707 	struct super_block *s = sdp->sd_vfs;
708 
709 	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
710 	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
711 	if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
712 		add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
713 	if (!uuid_is_null(&s->s_uuid))
714 		add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
715 	return 0;
716 }
717 
718 static const struct kset_uevent_ops gfs2_uevent_ops = {
719 	.uevent = gfs2_uevent,
720 };
721 
722 int gfs2_sys_init(void)
723 {
724 	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
725 	if (!gfs2_kset)
726 		return -ENOMEM;
727 	return 0;
728 }
729 
730 void gfs2_sys_uninit(void)
731 {
732 	kset_unregister(gfs2_kset);
733 }
734 
735