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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
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 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
82static 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
92static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
93{
94 unsigned int count;
95
96 mutex_lock(&sdp->sd_freeze_lock);
97 count = sdp->sd_freeze_count;
98 mutex_unlock(&sdp->sd_freeze_lock);
99
100 return snprintf(buf, PAGE_SIZE, "%u\n", count);
101}
102
103static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
104{
105 ssize_t ret = len;
106 int error = 0;
107 int n = simple_strtol(buf, NULL, 0);
108
109 if (!capable(CAP_SYS_ADMIN))
110 return -EACCES;
111
112 switch (n) {
113 case 0:
114 gfs2_unfreeze_fs(sdp);
115 break;
116 case 1:
117 error = gfs2_freeze_fs(sdp);
118 break;
119 default:
120 ret = -EINVAL;
121 }
122
123 if (error)
124 fs_warn(sdp, "freeze %d error %d", n, error);
125
126 return ret;
127}
128
129static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
130{
131 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
132 return snprintf(buf, PAGE_SIZE, "%u\n", b);
133}
134
135static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
136{
137 if (!capable(CAP_SYS_ADMIN))
138 return -EACCES;
139
140 if (simple_strtol(buf, NULL, 0) != 1)
141 return -EINVAL;
142
143 gfs2_lm_withdraw(sdp,
144 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
145 sdp->sd_fsname);
146 return len;
147}
148
149static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
150 size_t len)
151{
152 if (!capable(CAP_SYS_ADMIN))
153 return -EACCES;
154
155 if (simple_strtol(buf, NULL, 0) != 1)
156 return -EINVAL;
157
158 gfs2_statfs_sync(sdp->sd_vfs, 0);
159 return len;
160}
161
162static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
163 size_t len)
164{
165 if (!capable(CAP_SYS_ADMIN))
166 return -EACCES;
167
168 if (simple_strtol(buf, NULL, 0) != 1)
169 return -EINVAL;
170
171 gfs2_quota_sync(sdp->sd_vfs, 0);
172 return len;
173}
174
175static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
176 size_t len)
177{
178 int error;
179 u32 id;
180
181 if (!capable(CAP_SYS_ADMIN))
182 return -EACCES;
183
184 id = simple_strtoul(buf, NULL, 0);
185
186 error = gfs2_quota_refresh(sdp, 1, id);
187 return error ? error : len;
188}
189
190static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
191 size_t len)
192{
193 int error;
194 u32 id;
195
196 if (!capable(CAP_SYS_ADMIN))
197 return -EACCES;
198
199 id = simple_strtoul(buf, NULL, 0);
200
201 error = gfs2_quota_refresh(sdp, 0, id);
202 return error ? error : len;
203}
204
205static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
206{
207 struct gfs2_glock *gl;
208 const struct gfs2_glock_operations *glops;
209 unsigned int glmode;
210 unsigned int gltype;
211 unsigned long long glnum;
212 char mode[16];
213 int rv;
214
215 if (!capable(CAP_SYS_ADMIN))
216 return -EACCES;
217
218 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
219 mode);
220 if (rv != 3)
221 return -EINVAL;
222
223 if (strcmp(mode, "EX") == 0)
224 glmode = LM_ST_UNLOCKED;
225 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
226 glmode = LM_ST_DEFERRED;
227 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
228 glmode = LM_ST_SHARED;
229 else
230 return -EINVAL;
231
232 if (gltype > LM_TYPE_JOURNAL)
233 return -EINVAL;
234 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
235 glops = &gfs2_trans_glops;
236 else
237 glops = gfs2_glops_list[gltype];
238 if (glops == NULL)
239 return -EINVAL;
240 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
241 fs_info(sdp, "demote interface used\n");
242 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
243 if (rv)
244 return rv;
245 gfs2_glock_cb(gl, glmode);
246 gfs2_glock_put(gl);
247 return len;
248}
249
250
251#define GFS2_ATTR(name, mode, show, store) \
252static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
253
254GFS2_ATTR(id, 0444, id_show, NULL);
255GFS2_ATTR(fsname, 0444, fsname_show, NULL);
256GFS2_ATTR(uuid, 0444, uuid_show, NULL);
257GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
258GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
259GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
260GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
261GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
262GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
263GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
264
265static struct attribute *gfs2_attrs[] = {
266 &gfs2_attr_id.attr,
267 &gfs2_attr_fsname.attr,
268 &gfs2_attr_uuid.attr,
269 &gfs2_attr_freeze.attr,
270 &gfs2_attr_withdraw.attr,
271 &gfs2_attr_statfs_sync.attr,
272 &gfs2_attr_quota_sync.attr,
273 &gfs2_attr_quota_refresh_user.attr,
274 &gfs2_attr_quota_refresh_group.attr,
275 &gfs2_attr_demote_rq.attr,
276 NULL,
277};
278
279static void gfs2_sbd_release(struct kobject *kobj)
280{
281 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
282
283 kfree(sdp);
284}
285
286static struct kobj_type gfs2_ktype = {
287 .release = gfs2_sbd_release,
288 .default_attrs = gfs2_attrs,
289 .sysfs_ops = &gfs2_attr_ops,
290};
291
292
293
294
295
296
297static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
298{
299 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
300 return sprintf(buf, "%s\n", ops->lm_proto_name);
301}
302
303static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
304{
305 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
306 ssize_t ret;
307 int val = 0;
308
309 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
310 val = 1;
311 ret = sprintf(buf, "%d\n", val);
312 return ret;
313}
314
315static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
316{
317 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
318 ssize_t ret = len;
319 int val;
320
321 val = simple_strtol(buf, NULL, 0);
322
323 if (val == 1)
324 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
325 else if (val == 0) {
326 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
327 smp_mb__after_clear_bit();
328 gfs2_glock_thaw(sdp);
329 } else {
330 ret = -EINVAL;
331 }
332 return ret;
333}
334
335static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
336{
337 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
338 return sprintf(buf, "%d\n", ls->ls_first);
339}
340
341static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
342{
343 unsigned first;
344 int rv;
345
346 rv = sscanf(buf, "%u", &first);
347 if (rv != 1 || first > 1)
348 return -EINVAL;
349 rv = wait_for_completion_killable(&sdp->sd_locking_init);
350 if (rv)
351 return rv;
352 spin_lock(&sdp->sd_jindex_spin);
353 rv = -EBUSY;
354 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
355 goto out;
356 rv = -EINVAL;
357 if (sdp->sd_args.ar_spectator)
358 goto out;
359 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
360 goto out;
361 sdp->sd_lockstruct.ls_first = first;
362 rv = 0;
363out:
364 spin_unlock(&sdp->sd_jindex_spin);
365 return rv ? rv : len;
366}
367
368static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
369{
370 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
371 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
372}
373
374int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
375{
376 struct gfs2_jdesc *jd;
377 int rv;
378
379 spin_lock(&sdp->sd_jindex_spin);
380 rv = -EBUSY;
381 if (sdp->sd_jdesc->jd_jid == jid)
382 goto out;
383 rv = -ENOENT;
384 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
385 if (jd->jd_jid != jid)
386 continue;
387 rv = gfs2_recover_journal(jd, false);
388 break;
389 }
390out:
391 spin_unlock(&sdp->sd_jindex_spin);
392 return rv;
393}
394
395static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
396{
397 unsigned jid;
398 int rv;
399
400 rv = sscanf(buf, "%u", &jid);
401 if (rv != 1)
402 return -EINVAL;
403
404 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
405 rv = -ESHUTDOWN;
406 goto out;
407 }
408
409 rv = gfs2_recover_set(sdp, jid);
410out:
411 return rv ? rv : len;
412}
413
414static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
415{
416 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
417 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
418}
419
420static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
421{
422 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
423 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
424}
425
426static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
427{
428 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
429}
430
431static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
432{
433 int jid;
434 int rv;
435
436 rv = sscanf(buf, "%d", &jid);
437 if (rv != 1)
438 return -EINVAL;
439 rv = wait_for_completion_killable(&sdp->sd_locking_init);
440 if (rv)
441 return rv;
442 spin_lock(&sdp->sd_jindex_spin);
443 rv = -EINVAL;
444 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
445 goto out;
446 rv = -EBUSY;
447 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
448 goto out;
449 rv = 0;
450 if (sdp->sd_args.ar_spectator && jid > 0)
451 rv = jid = -EINVAL;
452 sdp->sd_lockstruct.ls_jid = jid;
453 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
454 smp_mb__after_clear_bit();
455 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
456out:
457 spin_unlock(&sdp->sd_jindex_spin);
458 return rv ? rv : len;
459}
460
461#define GDLM_ATTR(_name,_mode,_show,_store) \
462static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
463
464GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
465GDLM_ATTR(block, 0644, block_show, block_store);
466GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
467GDLM_ATTR(jid, 0644, jid_show, jid_store);
468GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
469GDLM_ATTR(first_done, 0444, first_done_show, NULL);
470GDLM_ATTR(recover, 0600, NULL, recover_store);
471GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
472GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
473
474static struct attribute *lock_module_attrs[] = {
475 &gdlm_attr_proto_name.attr,
476 &gdlm_attr_block.attr,
477 &gdlm_attr_withdraw.attr,
478 &gdlm_attr_jid.attr,
479 &gdlm_attr_first.attr,
480 &gdlm_attr_first_done.attr,
481 &gdlm_attr_recover.attr,
482 &gdlm_attr_recover_done.attr,
483 &gdlm_attr_recover_status.attr,
484 NULL,
485};
486
487
488
489
490
491static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
492{
493 return snprintf(buf, PAGE_SIZE, "%u %u\n",
494 sdp->sd_tune.gt_quota_scale_num,
495 sdp->sd_tune.gt_quota_scale_den);
496}
497
498static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
499 size_t len)
500{
501 struct gfs2_tune *gt = &sdp->sd_tune;
502 unsigned int x, y;
503
504 if (!capable(CAP_SYS_ADMIN))
505 return -EACCES;
506
507 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
508 return -EINVAL;
509
510 spin_lock(>->gt_spin);
511 gt->gt_quota_scale_num = x;
512 gt->gt_quota_scale_den = y;
513 spin_unlock(>->gt_spin);
514 return len;
515}
516
517static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
518 int check_zero, const char *buf, size_t len)
519{
520 struct gfs2_tune *gt = &sdp->sd_tune;
521 unsigned int x;
522
523 if (!capable(CAP_SYS_ADMIN))
524 return -EACCES;
525
526 x = simple_strtoul(buf, NULL, 0);
527
528 if (check_zero && !x)
529 return -EINVAL;
530
531 spin_lock(>->gt_spin);
532 *field = x;
533 spin_unlock(>->gt_spin);
534 return len;
535}
536
537#define TUNE_ATTR_3(name, show, store) \
538static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
539
540#define TUNE_ATTR_2(name, store) \
541static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
542{ \
543 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
544} \
545TUNE_ATTR_3(name, name##_show, store)
546
547#define TUNE_ATTR(name, check_zero) \
548static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
549{ \
550 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
551} \
552TUNE_ATTR_2(name, name##_store)
553
554TUNE_ATTR(quota_warn_period, 0);
555TUNE_ATTR(quota_quantum, 0);
556TUNE_ATTR(max_readahead, 0);
557TUNE_ATTR(complain_secs, 0);
558TUNE_ATTR(statfs_slow, 0);
559TUNE_ATTR(new_files_jdata, 0);
560TUNE_ATTR(quota_simul_sync, 1);
561TUNE_ATTR(statfs_quantum, 1);
562TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
563
564static struct attribute *tune_attrs[] = {
565 &tune_attr_quota_warn_period.attr,
566 &tune_attr_quota_quantum.attr,
567 &tune_attr_max_readahead.attr,
568 &tune_attr_complain_secs.attr,
569 &tune_attr_statfs_slow.attr,
570 &tune_attr_quota_simul_sync.attr,
571 &tune_attr_statfs_quantum.attr,
572 &tune_attr_quota_scale.attr,
573 &tune_attr_new_files_jdata.attr,
574 NULL,
575};
576
577static struct attribute_group tune_group = {
578 .name = "tune",
579 .attrs = tune_attrs,
580};
581
582static struct attribute_group lock_module_group = {
583 .name = "lock_module",
584 .attrs = lock_module_attrs,
585};
586
587int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
588{
589 struct super_block *sb = sdp->sd_vfs;
590 int error;
591 char ro[20];
592 char spectator[20];
593 char *envp[] = { ro, spectator, NULL };
594 int sysfs_frees_sdp = 0;
595
596 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
597 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
598
599 sdp->sd_kobj.kset = gfs2_kset;
600 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
601 "%s", sdp->sd_table_name);
602 if (error)
603 goto fail_reg;
604
605 sysfs_frees_sdp = 1;
606
607 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
608 if (error)
609 goto fail_reg;
610
611 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
612 if (error)
613 goto fail_tune;
614
615 error = sysfs_create_link(&sdp->sd_kobj,
616 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
617 "device");
618 if (error)
619 goto fail_lock_module;
620
621 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
622 return 0;
623
624fail_lock_module:
625 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
626fail_tune:
627 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
628fail_reg:
629 free_percpu(sdp->sd_lkstats);
630 fs_err(sdp, "error %d adding sysfs files", error);
631 if (sysfs_frees_sdp)
632 kobject_put(&sdp->sd_kobj);
633 else
634 kfree(sdp);
635 sb->s_fs_info = NULL;
636 return error;
637}
638
639void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
640{
641 sysfs_remove_link(&sdp->sd_kobj, "device");
642 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
643 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
644 kobject_put(&sdp->sd_kobj);
645}
646
647static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
648 struct kobj_uevent_env *env)
649{
650 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
651 struct super_block *s = sdp->sd_vfs;
652 const u8 *uuid = s->s_uuid;
653
654 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
655 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
656 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
657 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
658 if (gfs2_uuid_valid(uuid))
659 add_uevent_var(env, "UUID=%pUB", uuid);
660 return 0;
661}
662
663static const struct kset_uevent_ops gfs2_uevent_ops = {
664 .uevent = gfs2_uevent,
665};
666
667int gfs2_sys_init(void)
668{
669 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
670 if (!gfs2_kset)
671 return -ENOMEM;
672 return 0;
673}
674
675void gfs2_sys_uninit(void)
676{
677 kset_unregister(gfs2_kset);
678}
679
680
