Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
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, 1);
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 struct kobj_type gfs2_ktype = {
280 .default_attrs = gfs2_attrs,
281 .sysfs_ops = &gfs2_attr_ops,
282};
283
284
285/*
286 * lock_module. Originally from lock_dlm
287 */
288
289static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
290{
291 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
292 return sprintf(buf, "%s\n", ops->lm_proto_name);
293}
294
295static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
296{
297 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
298 ssize_t ret;
299 int val = 0;
300
301 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
302 val = 1;
303 ret = sprintf(buf, "%d\n", val);
304 return ret;
305}
306
307static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
308{
309 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
310 ssize_t ret = len;
311 int val;
312
313 val = simple_strtol(buf, NULL, 0);
314
315 if (val == 1)
316 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
317 else if (val == 0) {
318 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
319 smp_mb__after_clear_bit();
320 gfs2_glock_thaw(sdp);
321 } else {
322 ret = -EINVAL;
323 }
324 return ret;
325}
326
327static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
328{
329 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
330 return sprintf(buf, "%d\n", ls->ls_first);
331}
332
333static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
334{
335 unsigned first;
336 int rv;
337
338 rv = sscanf(buf, "%u", &first);
339 if (rv != 1 || first > 1)
340 return -EINVAL;
341 rv = wait_for_completion_killable(&sdp->sd_locking_init);
342 if (rv)
343 return rv;
344 spin_lock(&sdp->sd_jindex_spin);
345 rv = -EBUSY;
346 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
347 goto out;
348 rv = -EINVAL;
349 if (sdp->sd_args.ar_spectator)
350 goto out;
351 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
352 goto out;
353 sdp->sd_lockstruct.ls_first = first;
354 rv = 0;
355out:
356 spin_unlock(&sdp->sd_jindex_spin);
357 return rv ? rv : len;
358}
359
360static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
361{
362 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
363 return sprintf(buf, "%d\n", ls->ls_first_done);
364}
365
366static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
367{
368 unsigned jid;
369 struct gfs2_jdesc *jd;
370 int rv;
371
372 rv = sscanf(buf, "%u", &jid);
373 if (rv != 1)
374 return -EINVAL;
375
376 rv = -ESHUTDOWN;
377 spin_lock(&sdp->sd_jindex_spin);
378 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
379 goto out;
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 ? rv : len;
393}
394
395static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
396{
397 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
398 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
399}
400
401static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
402{
403 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
404 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
405}
406
407static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
408{
409 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
410}
411
412static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
413{
414 int jid;
415 int rv;
416
417 rv = sscanf(buf, "%d", &jid);
418 if (rv != 1)
419 return -EINVAL;
420 rv = wait_for_completion_killable(&sdp->sd_locking_init);
421 if (rv)
422 return rv;
423 spin_lock(&sdp->sd_jindex_spin);
424 rv = -EINVAL;
425 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
426 goto out;
427 rv = -EBUSY;
428 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
429 goto out;
430 rv = 0;
431 if (sdp->sd_args.ar_spectator && jid > 0)
432 rv = jid = -EINVAL;
433 sdp->sd_lockstruct.ls_jid = jid;
434 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
435 smp_mb__after_clear_bit();
436 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
437out:
438 spin_unlock(&sdp->sd_jindex_spin);
439 return rv ? rv : len;
440}
441
442#define GDLM_ATTR(_name,_mode,_show,_store) \
443static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
444
445GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
446GDLM_ATTR(block, 0644, block_show, block_store);
447GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
448GDLM_ATTR(jid, 0644, jid_show, jid_store);
449GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
450GDLM_ATTR(first_done, 0444, first_done_show, NULL);
451GDLM_ATTR(recover, 0600, NULL, recover_store);
452GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
453GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
454
455static struct attribute *lock_module_attrs[] = {
456 &gdlm_attr_proto_name.attr,
457 &gdlm_attr_block.attr,
458 &gdlm_attr_withdraw.attr,
459 &gdlm_attr_jid.attr,
460 &gdlm_attr_first.attr,
461 &gdlm_attr_first_done.attr,
462 &gdlm_attr_recover.attr,
463 &gdlm_attr_recover_done.attr,
464 &gdlm_attr_recover_status.attr,
465 NULL,
466};
467
468/*
469 * get and set struct gfs2_tune fields
470 */
471
472static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
473{
474 return snprintf(buf, PAGE_SIZE, "%u %u\n",
475 sdp->sd_tune.gt_quota_scale_num,
476 sdp->sd_tune.gt_quota_scale_den);
477}
478
479static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
480 size_t len)
481{
482 struct gfs2_tune *gt = &sdp->sd_tune;
483 unsigned int x, y;
484
485 if (!capable(CAP_SYS_ADMIN))
486 return -EACCES;
487
488 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
489 return -EINVAL;
490
491 spin_lock(>->gt_spin);
492 gt->gt_quota_scale_num = x;
493 gt->gt_quota_scale_den = y;
494 spin_unlock(>->gt_spin);
495 return len;
496}
497
498static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
499 int check_zero, const char *buf, size_t len)
500{
501 struct gfs2_tune *gt = &sdp->sd_tune;
502 unsigned int x;
503
504 if (!capable(CAP_SYS_ADMIN))
505 return -EACCES;
506
507 x = simple_strtoul(buf, NULL, 0);
508
509 if (check_zero && !x)
510 return -EINVAL;
511
512 spin_lock(>->gt_spin);
513 *field = x;
514 spin_unlock(>->gt_spin);
515 return len;
516}
517
518#define TUNE_ATTR_3(name, show, store) \
519static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
520
521#define TUNE_ATTR_2(name, store) \
522static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
523{ \
524 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
525} \
526TUNE_ATTR_3(name, name##_show, store)
527
528#define TUNE_ATTR(name, check_zero) \
529static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
530{ \
531 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
532} \
533TUNE_ATTR_2(name, name##_store)
534
535TUNE_ATTR(quota_warn_period, 0);
536TUNE_ATTR(quota_quantum, 0);
537TUNE_ATTR(max_readahead, 0);
538TUNE_ATTR(complain_secs, 0);
539TUNE_ATTR(statfs_slow, 0);
540TUNE_ATTR(new_files_jdata, 0);
541TUNE_ATTR(quota_simul_sync, 1);
542TUNE_ATTR(statfs_quantum, 1);
543TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
544
545static struct attribute *tune_attrs[] = {
546 &tune_attr_quota_warn_period.attr,
547 &tune_attr_quota_quantum.attr,
548 &tune_attr_max_readahead.attr,
549 &tune_attr_complain_secs.attr,
550 &tune_attr_statfs_slow.attr,
551 &tune_attr_quota_simul_sync.attr,
552 &tune_attr_statfs_quantum.attr,
553 &tune_attr_quota_scale.attr,
554 &tune_attr_new_files_jdata.attr,
555 NULL,
556};
557
558static struct attribute_group tune_group = {
559 .name = "tune",
560 .attrs = tune_attrs,
561};
562
563static struct attribute_group lock_module_group = {
564 .name = "lock_module",
565 .attrs = lock_module_attrs,
566};
567
568int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
569{
570 struct super_block *sb = sdp->sd_vfs;
571 int error;
572 char ro[20];
573 char spectator[20];
574 char *envp[] = { ro, spectator, NULL };
575
576 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
577 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
578
579 sdp->sd_kobj.kset = gfs2_kset;
580 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
581 "%s", sdp->sd_table_name);
582 if (error)
583 goto fail;
584
585 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
586 if (error)
587 goto fail_reg;
588
589 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
590 if (error)
591 goto fail_tune;
592
593 error = sysfs_create_link(&sdp->sd_kobj,
594 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
595 "device");
596 if (error)
597 goto fail_lock_module;
598
599 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
600 return 0;
601
602fail_lock_module:
603 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
604fail_tune:
605 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
606fail_reg:
607 kobject_put(&sdp->sd_kobj);
608fail:
609 fs_err(sdp, "error %d adding sysfs files", error);
610 return error;
611}
612
613void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
614{
615 sysfs_remove_link(&sdp->sd_kobj, "device");
616 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
617 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
618 kobject_put(&sdp->sd_kobj);
619}
620
621static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
622 struct kobj_uevent_env *env)
623{
624 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
625 struct super_block *s = sdp->sd_vfs;
626 const u8 *uuid = s->s_uuid;
627
628 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
629 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
630 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
631 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
632 if (gfs2_uuid_valid(uuid))
633 add_uevent_var(env, "UUID=%pUB", uuid);
634 return 0;
635}
636
637static const struct kset_uevent_ops gfs2_uevent_ops = {
638 .uevent = gfs2_uevent,
639};
640
641int gfs2_sys_init(void)
642{
643 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
644 if (!gfs2_kset)
645 return -ENOMEM;
646 return 0;
647}
648
649void gfs2_sys_uninit(void)
650{
651 kset_unregister(gfs2_kset);
652}
653