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TOMOYO Linux Cross Reference
Linux/fs/gfs2/sys.c

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
  4  *
  5  * This copyrighted material is made available to anyone wishing to use,
  6  * modify, copy, or redistribute it subject to the terms and conditions
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 #include <linux/sched.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 <asm/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 int gfs2_uuid_valid(const u8 *uuid)
 72 {
 73         int i;
 74 
 75         for (i = 0; i < 16; i++) {
 76                 if (uuid[i])
 77                         return 1;
 78         }
 79         return 0;
 80 }
 81 
 82 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
 83 {
 84         struct super_block *s = sdp->sd_vfs;
 85         const u8 *uuid = s->s_uuid;
 86         buf[0] = '\0';
 87         if (!gfs2_uuid_valid(uuid))
 88                 return 0;
 89         return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
 90 }
 91 
 92 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
 93 {
 94         struct super_block *sb = sdp->sd_vfs;
 95         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
 96 
 97         return snprintf(buf, PAGE_SIZE, "%u\n", frozen);
 98 }
 99 
100 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
101 {
102         int error;
103         int n = simple_strtol(buf, NULL, 0);
104 
105         if (!capable(CAP_SYS_ADMIN))
106                 return -EPERM;
107 
108         switch (n) {
109         case 0:
110                 error = thaw_super(sdp->sd_vfs);
111                 break;
112         case 1:
113                 error = freeze_super(sdp->sd_vfs);
114                 break;
115         default:
116                 return -EINVAL;
117         }
118 
119         if (error) {
120                 fs_warn(sdp, "freeze %d error %d", n, error);
121                 return error;
122         }
123 
124         return len;
125 }
126 
127 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
128 {
129         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
130         return snprintf(buf, PAGE_SIZE, "%u\n", b);
131 }
132 
133 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
134 {
135         if (!capable(CAP_SYS_ADMIN))
136                 return -EPERM;
137 
138         if (simple_strtol(buf, NULL, 0) != 1)
139                 return -EINVAL;
140 
141         gfs2_lm_withdraw(sdp,
142                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
143                 sdp->sd_fsname);
144         return len;
145 }
146 
147 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
148                                  size_t len)
149 {
150         if (!capable(CAP_SYS_ADMIN))
151                 return -EPERM;
152 
153         if (simple_strtol(buf, NULL, 0) != 1)
154                 return -EINVAL;
155 
156         gfs2_statfs_sync(sdp->sd_vfs, 0);
157         return len;
158 }
159 
160 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
161                                 size_t len)
162 {
163         if (!capable(CAP_SYS_ADMIN))
164                 return -EPERM;
165 
166         if (simple_strtol(buf, NULL, 0) != 1)
167                 return -EINVAL;
168 
169         gfs2_quota_sync(sdp->sd_vfs, 0);
170         return len;
171 }
172 
173 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
174                                         size_t len)
175 {
176         struct kqid qid;
177         int error;
178         u32 id;
179 
180         if (!capable(CAP_SYS_ADMIN))
181                 return -EPERM;
182 
183         id = simple_strtoul(buf, NULL, 0);
184 
185         qid = make_kqid(current_user_ns(), USRQUOTA, id);
186         if (!qid_valid(qid))
187                 return -EINVAL;
188 
189         error = gfs2_quota_refresh(sdp, qid);
190         return error ? error : len;
191 }
192 
193 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
194                                          size_t len)
195 {
196         struct kqid qid;
197         int error;
198         u32 id;
199 
200         if (!capable(CAP_SYS_ADMIN))
201                 return -EPERM;
202 
203         id = simple_strtoul(buf, NULL, 0);
204 
205         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
206         if (!qid_valid(qid))
207                 return -EINVAL;
208 
209         error = gfs2_quota_refresh(sdp, qid);
210         return error ? error : len;
211 }
212 
213 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
214 {
215         struct gfs2_glock *gl;
216         const struct gfs2_glock_operations *glops;
217         unsigned int glmode;
218         unsigned int gltype;
219         unsigned long long glnum;
220         char mode[16];
221         int rv;
222 
223         if (!capable(CAP_SYS_ADMIN))
224                 return -EPERM;
225 
226         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
227                     mode);
228         if (rv != 3)
229                 return -EINVAL;
230 
231         if (strcmp(mode, "EX") == 0)
232                 glmode = LM_ST_UNLOCKED;
233         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
234                 glmode = LM_ST_DEFERRED;
235         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
236                 glmode = LM_ST_SHARED;
237         else
238                 return -EINVAL;
239 
240         if (gltype > LM_TYPE_JOURNAL)
241                 return -EINVAL;
242         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
243                 glops = &gfs2_trans_glops;
244         else
245                 glops = gfs2_glops_list[gltype];
246         if (glops == NULL)
247                 return -EINVAL;
248         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
249                 fs_info(sdp, "demote interface used\n");
250         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
251         if (rv)
252                 return rv;
253         gfs2_glock_cb(gl, glmode);
254         gfs2_glock_put(gl);
255         return len;
256 }
257 
258 
259 #define GFS2_ATTR(name, mode, show, store) \
260 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
261 
262 GFS2_ATTR(id,                  0444, id_show,       NULL);
263 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
264 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
265 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
266 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
267 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
268 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
269 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
270 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
271 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
272 
273 static struct attribute *gfs2_attrs[] = {
274         &gfs2_attr_id.attr,
275         &gfs2_attr_fsname.attr,
276         &gfs2_attr_uuid.attr,
277         &gfs2_attr_freeze.attr,
278         &gfs2_attr_withdraw.attr,
279         &gfs2_attr_statfs_sync.attr,
280         &gfs2_attr_quota_sync.attr,
281         &gfs2_attr_quota_refresh_user.attr,
282         &gfs2_attr_quota_refresh_group.attr,
283         &gfs2_attr_demote_rq.attr,
284         NULL,
285 };
286 
287 static void gfs2_sbd_release(struct kobject *kobj)
288 {
289         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
290 
291         kfree(sdp);
292 }
293 
294 static struct kobj_type gfs2_ktype = {
295         .release = gfs2_sbd_release,
296         .default_attrs = gfs2_attrs,
297         .sysfs_ops     = &gfs2_attr_ops,
298 };
299 
300 
301 /*
302  * lock_module. Originally from lock_dlm
303  */
304 
305 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
306 {
307         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
308         return sprintf(buf, "%s\n", ops->lm_proto_name);
309 }
310 
311 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
312 {
313         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
314         ssize_t ret;
315         int val = 0;
316 
317         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
318                 val = 1;
319         ret = sprintf(buf, "%d\n", val);
320         return ret;
321 }
322 
323 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
324 {
325         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
326         ssize_t ret = len;
327         int val;
328 
329         val = simple_strtol(buf, NULL, 0);
330 
331         if (val == 1)
332                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
333         else if (val == 0) {
334                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
335                 smp_mb__after_clear_bit();
336                 gfs2_glock_thaw(sdp);
337         } else {
338                 ret = -EINVAL;
339         }
340         return ret;
341 }
342 
343 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
344 {
345         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
346 
347         return sprintf(buf, "%d\n", val);
348 }
349 
350 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
351 {
352         ssize_t ret = len;
353         int val;
354 
355         val = simple_strtol(buf, NULL, 0);
356 
357         if ((val == 1) &&
358             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
359                 complete(&sdp->sd_wdack);
360         else
361                 ret = -EINVAL;
362         return ret;
363 }
364 
365 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
366 {
367         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
368         return sprintf(buf, "%d\n", ls->ls_first);
369 }
370 
371 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
372 {
373         unsigned first;
374         int rv;
375 
376         rv = sscanf(buf, "%u", &first);
377         if (rv != 1 || first > 1)
378                 return -EINVAL;
379         rv = wait_for_completion_killable(&sdp->sd_locking_init);
380         if (rv)
381                 return rv;
382         spin_lock(&sdp->sd_jindex_spin);
383         rv = -EBUSY;
384         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
385                 goto out;
386         rv = -EINVAL;
387         if (sdp->sd_args.ar_spectator)
388                 goto out;
389         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
390                 goto out;
391         sdp->sd_lockstruct.ls_first = first;
392         rv = 0;
393 out:
394         spin_unlock(&sdp->sd_jindex_spin);
395         return rv ? rv : len;
396 }
397 
398 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
399 {
400         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
401         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
402 }
403 
404 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
405 {
406         struct gfs2_jdesc *jd;
407         int rv;
408 
409         spin_lock(&sdp->sd_jindex_spin);
410         rv = -EBUSY;
411         if (sdp->sd_jdesc->jd_jid == jid)
412                 goto out;
413         rv = -ENOENT;
414         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
415                 if (jd->jd_jid != jid)
416                         continue;
417                 rv = gfs2_recover_journal(jd, false);
418                 break;
419         }
420 out:
421         spin_unlock(&sdp->sd_jindex_spin);
422         return rv;
423 }
424 
425 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
426 {
427         unsigned jid;
428         int rv;
429 
430         rv = sscanf(buf, "%u", &jid);
431         if (rv != 1)
432                 return -EINVAL;
433 
434         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
435                 rv = -ESHUTDOWN;
436                 goto out;
437         }
438 
439         rv = gfs2_recover_set(sdp, jid);
440 out:
441         return rv ? rv : len;
442 }
443 
444 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
445 {
446         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
447         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
448 }
449 
450 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
451 {
452         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
453         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
454 }
455 
456 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
457 {
458         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
459 }
460 
461 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
462 {
463         int jid;
464         int rv;
465 
466         rv = sscanf(buf, "%d", &jid);
467         if (rv != 1)
468                 return -EINVAL;
469         rv = wait_for_completion_killable(&sdp->sd_locking_init);
470         if (rv)
471                 return rv;
472         spin_lock(&sdp->sd_jindex_spin);
473         rv = -EINVAL;
474         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
475                 goto out;
476         rv = -EBUSY;
477         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
478                 goto out;
479         rv = 0;
480         if (sdp->sd_args.ar_spectator && jid > 0)
481                 rv = jid = -EINVAL;
482         sdp->sd_lockstruct.ls_jid = jid;
483         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
484         smp_mb__after_clear_bit();
485         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
486 out:
487         spin_unlock(&sdp->sd_jindex_spin);
488         return rv ? rv : len;
489 }
490 
491 #define GDLM_ATTR(_name,_mode,_show,_store) \
492 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
493 
494 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
495 GDLM_ATTR(block,                0644, block_show,               block_store);
496 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
497 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
498 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
499 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
500 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
501 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
502 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
503 
504 static struct attribute *lock_module_attrs[] = {
505         &gdlm_attr_proto_name.attr,
506         &gdlm_attr_block.attr,
507         &gdlm_attr_withdraw.attr,
508         &gdlm_attr_jid.attr,
509         &gdlm_attr_first.attr,
510         &gdlm_attr_first_done.attr,
511         &gdlm_attr_recover.attr,
512         &gdlm_attr_recover_done.attr,
513         &gdlm_attr_recover_status.attr,
514         NULL,
515 };
516 
517 /*
518  * get and set struct gfs2_tune fields
519  */
520 
521 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
522 {
523         return snprintf(buf, PAGE_SIZE, "%u %u\n",
524                         sdp->sd_tune.gt_quota_scale_num,
525                         sdp->sd_tune.gt_quota_scale_den);
526 }
527 
528 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
529                                  size_t len)
530 {
531         struct gfs2_tune *gt = &sdp->sd_tune;
532         unsigned int x, y;
533 
534         if (!capable(CAP_SYS_ADMIN))
535                 return -EPERM;
536 
537         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
538                 return -EINVAL;
539 
540         spin_lock(&gt->gt_spin);
541         gt->gt_quota_scale_num = x;
542         gt->gt_quota_scale_den = y;
543         spin_unlock(&gt->gt_spin);
544         return len;
545 }
546 
547 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
548                         int check_zero, const char *buf, size_t len)
549 {
550         struct gfs2_tune *gt = &sdp->sd_tune;
551         unsigned int x;
552 
553         if (!capable(CAP_SYS_ADMIN))
554                 return -EPERM;
555 
556         x = simple_strtoul(buf, NULL, 0);
557 
558         if (check_zero && !x)
559                 return -EINVAL;
560 
561         spin_lock(&gt->gt_spin);
562         *field = x;
563         spin_unlock(&gt->gt_spin);
564         return len;
565 }
566 
567 #define TUNE_ATTR_3(name, show, store)                                        \
568 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
569 
570 #define TUNE_ATTR_2(name, store)                                              \
571 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
572 {                                                                             \
573         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
574 }                                                                             \
575 TUNE_ATTR_3(name, name##_show, store)
576 
577 #define TUNE_ATTR(name, check_zero)                                           \
578 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
579 {                                                                             \
580         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
581 }                                                                             \
582 TUNE_ATTR_2(name, name##_store)
583 
584 TUNE_ATTR(quota_warn_period, 0);
585 TUNE_ATTR(quota_quantum, 0);
586 TUNE_ATTR(max_readahead, 0);
587 TUNE_ATTR(complain_secs, 0);
588 TUNE_ATTR(statfs_slow, 0);
589 TUNE_ATTR(new_files_jdata, 0);
590 TUNE_ATTR(quota_simul_sync, 1);
591 TUNE_ATTR(statfs_quantum, 1);
592 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
593 
594 static struct attribute *tune_attrs[] = {
595         &tune_attr_quota_warn_period.attr,
596         &tune_attr_quota_quantum.attr,
597         &tune_attr_max_readahead.attr,
598         &tune_attr_complain_secs.attr,
599         &tune_attr_statfs_slow.attr,
600         &tune_attr_quota_simul_sync.attr,
601         &tune_attr_statfs_quantum.attr,
602         &tune_attr_quota_scale.attr,
603         &tune_attr_new_files_jdata.attr,
604         NULL,
605 };
606 
607 static struct attribute_group tune_group = {
608         .name = "tune",
609         .attrs = tune_attrs,
610 };
611 
612 static struct attribute_group lock_module_group = {
613         .name = "lock_module",
614         .attrs = lock_module_attrs,
615 };
616 
617 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
618 {
619         struct super_block *sb = sdp->sd_vfs;
620         int error;
621         char ro[20];
622         char spectator[20];
623         char *envp[] = { ro, spectator, NULL };
624         int sysfs_frees_sdp = 0;
625 
626         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
627         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
628 
629         sdp->sd_kobj.kset = gfs2_kset;
630         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
631                                      "%s", sdp->sd_table_name);
632         if (error)
633                 goto fail_reg;
634 
635         sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
636                                 function gfs2_sbd_release. */
637         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
638         if (error)
639                 goto fail_reg;
640 
641         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
642         if (error)
643                 goto fail_tune;
644 
645         error = sysfs_create_link(&sdp->sd_kobj,
646                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
647                                   "device");
648         if (error)
649                 goto fail_lock_module;
650 
651         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
652         return 0;
653 
654 fail_lock_module:
655         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
656 fail_tune:
657         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
658 fail_reg:
659         free_percpu(sdp->sd_lkstats);
660         fs_err(sdp, "error %d adding sysfs files", error);
661         if (sysfs_frees_sdp)
662                 kobject_put(&sdp->sd_kobj);
663         else
664                 kfree(sdp);
665         sb->s_fs_info = NULL;
666         return error;
667 }
668 
669 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
670 {
671         sysfs_remove_link(&sdp->sd_kobj, "device");
672         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
673         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
674         kobject_put(&sdp->sd_kobj);
675 }
676 
677 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
678                        struct kobj_uevent_env *env)
679 {
680         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
681         struct super_block *s = sdp->sd_vfs;
682         const u8 *uuid = s->s_uuid;
683 
684         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
685         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
686         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
687                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
688         if (gfs2_uuid_valid(uuid))
689                 add_uevent_var(env, "UUID=%pUB", uuid);
690         return 0;
691 }
692 
693 static const struct kset_uevent_ops gfs2_uevent_ops = {
694         .uevent = gfs2_uevent,
695 };
696 
697 int gfs2_sys_init(void)
698 {
699         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
700         if (!gfs2_kset)
701                 return -ENOMEM;
702         return 0;
703 }
704 
705 void gfs2_sys_uninit(void)
706 {
707         kset_unregister(gfs2_kset);
708 }
709 
710 

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