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 const u8 *uuid = sdp->sd_sb.sb_uuid;
85 buf[0] = '\0';
86 if (!gfs2_uuid_valid(uuid))
87 return 0;
88 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
89}
90
91static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
92{
93 unsigned int count;
94
95 mutex_lock(&sdp->sd_freeze_lock);
96 count = sdp->sd_freeze_count;
97 mutex_unlock(&sdp->sd_freeze_lock);
98
99 return snprintf(buf, PAGE_SIZE, "%u\n", count);
100}
101
102static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
103{
104 ssize_t ret = len;
105 int error = 0;
106 int n = simple_strtol(buf, NULL, 0);
107
108 if (!capable(CAP_SYS_ADMIN))
109 return -EACCES;
110
111 switch (n) {
112 case 0:
113 gfs2_unfreeze_fs(sdp);
114 break;
115 case 1:
116 error = gfs2_freeze_fs(sdp);
117 break;
118 default:
119 ret = -EINVAL;
120 }
121
122 if (error)
123 fs_warn(sdp, "freeze %d error %d", n, error);
124
125 return ret;
126}
127
128static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
129{
130 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
131 return snprintf(buf, PAGE_SIZE, "%u\n", b);
132}
133
134static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
135{
136 if (!capable(CAP_SYS_ADMIN))
137 return -EACCES;
138
139 if (simple_strtol(buf, NULL, 0) != 1)
140 return -EINVAL;
141
142 gfs2_lm_withdraw(sdp,
143 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
144 sdp->sd_fsname);
145 return len;
146}
147
148static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
149 size_t len)
150{
151 if (!capable(CAP_SYS_ADMIN))
152 return -EACCES;
153
154 if (simple_strtol(buf, NULL, 0) != 1)
155 return -EINVAL;
156
157 gfs2_statfs_sync(sdp->sd_vfs, 0);
158 return len;
159}
160
161static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
162 size_t len)
163{
164 if (!capable(CAP_SYS_ADMIN))
165 return -EACCES;
166
167 if (simple_strtol(buf, NULL, 0) != 1)
168 return -EINVAL;
169
170 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
171 return len;
172}
173
174static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
175 size_t len)
176{
177 int error;
178 u32 id;
179
180 if (!capable(CAP_SYS_ADMIN))
181 return -EACCES;
182
183 id = simple_strtoul(buf, NULL, 0);
184
185 error = gfs2_quota_refresh(sdp, 1, id);
186 return error ? error : len;
187}
188
189static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
190 size_t len)
191{
192 int error;
193 u32 id;
194
195 if (!capable(CAP_SYS_ADMIN))
196 return -EACCES;
197
198 id = simple_strtoul(buf, NULL, 0);
199
200 error = gfs2_quota_refresh(sdp, 0, id);
201 return error ? error : len;
202}
203
204static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
205{
206 struct gfs2_glock *gl;
207 const struct gfs2_glock_operations *glops;
208 unsigned int glmode;
209 unsigned int gltype;
210 unsigned long long glnum;
211 char mode[16];
212 int rv;
213
214 if (!capable(CAP_SYS_ADMIN))
215 return -EACCES;
216
217 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
218 mode);
219 if (rv != 3)
220 return -EINVAL;
221
222 if (strcmp(mode, "EX") == 0)
223 glmode = LM_ST_UNLOCKED;
224 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
225 glmode = LM_ST_DEFERRED;
226 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
227 glmode = LM_ST_SHARED;
228 else
229 return -EINVAL;
230
231 if (gltype > LM_TYPE_JOURNAL)
232 return -EINVAL;
233 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
234 glops = &gfs2_trans_glops;
235 else
236 glops = gfs2_glops_list[gltype];
237 if (glops == NULL)
238 return -EINVAL;
239 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
240 fs_info(sdp, "demote interface used\n");
241 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
242 if (rv)
243 return rv;
244 gfs2_glock_cb(gl, glmode);
245 gfs2_glock_put(gl);
246 return len;
247}
248
249
250#define GFS2_ATTR(name, mode, show, store) \
251static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
252
253GFS2_ATTR(id, 0444, id_show, NULL);
254GFS2_ATTR(fsname, 0444, fsname_show, NULL);
255GFS2_ATTR(uuid, 0444, uuid_show, NULL);
256GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
257GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
258GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
259GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
260GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
261GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
262GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
263
264static struct attribute *gfs2_attrs[] = {
265 &gfs2_attr_id.attr,
266 &gfs2_attr_fsname.attr,
267 &gfs2_attr_uuid.attr,
268 &gfs2_attr_freeze.attr,
269 &gfs2_attr_withdraw.attr,
270 &gfs2_attr_statfs_sync.attr,
271 &gfs2_attr_quota_sync.attr,
272 &gfs2_attr_quota_refresh_user.attr,
273 &gfs2_attr_quota_refresh_group.attr,
274 &gfs2_attr_demote_rq.attr,
275 NULL,
276};
277
278static struct kobj_type gfs2_ktype = {
279 .default_attrs = gfs2_attrs,
280 .sysfs_ops = &gfs2_attr_ops,
281};
282
283
284/*
285 * lock_module. Originally from lock_dlm
286 */
287
288static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
289{
290 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
291 return sprintf(buf, "%s\n", ops->lm_proto_name);
292}
293
294static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
295{
296 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
297 ssize_t ret;
298 int val = 0;
299
300 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
301 val = 1;
302 ret = sprintf(buf, "%d\n", val);
303 return ret;
304}
305
306static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
307{
308 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
309 ssize_t ret = len;
310 int val;
311
312 val = simple_strtol(buf, NULL, 0);
313
314 if (val == 1)
315 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
316 else if (val == 0) {
317 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
318 smp_mb__after_clear_bit();
319 gfs2_glock_thaw(sdp);
320 } else {
321 ret = -EINVAL;
322 }
323 return ret;
324}
325
326static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
327{
328 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
329 return sprintf(buf, "%d\n", ls->ls_first);
330}
331
332static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
333{
334 unsigned first;
335 int rv;
336
337 rv = sscanf(buf, "%u", &first);
338 if (rv != 1 || first > 1)
339 return -EINVAL;
340 spin_lock(&sdp->sd_jindex_spin);
341 rv = -EBUSY;
342 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
343 goto out;
344 rv = -EINVAL;
345 if (sdp->sd_args.ar_spectator)
346 goto out;
347 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
348 goto out;
349 sdp->sd_lockstruct.ls_first = first;
350 rv = 0;
351out:
352 spin_unlock(&sdp->sd_jindex_spin);
353 return rv ? rv : len;
354}
355
356static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
357{
358 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
359 return sprintf(buf, "%d\n", ls->ls_first_done);
360}
361
362static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
363{
364 unsigned jid;
365 struct gfs2_jdesc *jd;
366 int rv;
367
368 rv = sscanf(buf, "%u", &jid);
369 if (rv != 1)
370 return -EINVAL;
371
372 rv = -ESHUTDOWN;
373 spin_lock(&sdp->sd_jindex_spin);
374 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
375 goto out;
376 rv = -EBUSY;
377 if (sdp->sd_jdesc->jd_jid == jid)
378 goto out;
379 rv = -ENOENT;
380 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
381 if (jd->jd_jid != jid)
382 continue;
383 rv = gfs2_recover_journal(jd, false);
384 break;
385 }
386out:
387 spin_unlock(&sdp->sd_jindex_spin);
388 return rv ? rv : len;
389}
390
391static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
392{
393 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
394 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
395}
396
397static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
398{
399 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
400 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
401}
402
403static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
404{
405 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
406}
407
408static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
409{
410 int jid;
411 int rv;
412
413 rv = sscanf(buf, "%d", &jid);
414 if (rv != 1)
415 return -EINVAL;
416
417 spin_lock(&sdp->sd_jindex_spin);
418 rv = -EINVAL;
419 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
420 goto out;
421 rv = -EBUSY;
422 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
423 goto out;
424 rv = 0;
425 if (sdp->sd_args.ar_spectator && jid > 0)
426 rv = jid = -EINVAL;
427 sdp->sd_lockstruct.ls_jid = jid;
428 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
429 smp_mb__after_clear_bit();
430 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
431out:
432 spin_unlock(&sdp->sd_jindex_spin);
433 return rv ? rv : len;
434}
435
436#define GDLM_ATTR(_name,_mode,_show,_store) \
437static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
438
439GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
440GDLM_ATTR(block, 0644, block_show, block_store);
441GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
442GDLM_ATTR(jid, 0644, jid_show, jid_store);
443GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store);
444GDLM_ATTR(first_done, 0444, first_done_show, NULL);
445GDLM_ATTR(recover, 0600, NULL, recover_store);
446GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
447GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
448
449static struct attribute *lock_module_attrs[] = {
450 &gdlm_attr_proto_name.attr,
451 &gdlm_attr_block.attr,
452 &gdlm_attr_withdraw.attr,
453 &gdlm_attr_jid.attr,
454 &gdlm_attr_first.attr,
455 &gdlm_attr_first_done.attr,
456 &gdlm_attr_recover.attr,
457 &gdlm_attr_recover_done.attr,
458 &gdlm_attr_recover_status.attr,
459 NULL,
460};
461
462/*
463 * get and set struct gfs2_tune fields
464 */
465
466static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
467{
468 return snprintf(buf, PAGE_SIZE, "%u %u\n",
469 sdp->sd_tune.gt_quota_scale_num,
470 sdp->sd_tune.gt_quota_scale_den);
471}
472
473static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
474 size_t len)
475{
476 struct gfs2_tune *gt = &sdp->sd_tune;
477 unsigned int x, y;
478
479 if (!capable(CAP_SYS_ADMIN))
480 return -EACCES;
481
482 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
483 return -EINVAL;
484
485 spin_lock(>->gt_spin);
486 gt->gt_quota_scale_num = x;
487 gt->gt_quota_scale_den = y;
488 spin_unlock(>->gt_spin);
489 return len;
490}
491
492static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
493 int check_zero, const char *buf, size_t len)
494{
495 struct gfs2_tune *gt = &sdp->sd_tune;
496 unsigned int x;
497
498 if (!capable(CAP_SYS_ADMIN))
499 return -EACCES;
500
501 x = simple_strtoul(buf, NULL, 0);
502
503 if (check_zero && !x)
504 return -EINVAL;
505
506 spin_lock(>->gt_spin);
507 *field = x;
508 spin_unlock(>->gt_spin);
509 return len;
510}
511
512#define TUNE_ATTR_3(name, show, store) \
513static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
514
515#define TUNE_ATTR_2(name, store) \
516static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
517{ \
518 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
519} \
520TUNE_ATTR_3(name, name##_show, store)
521
522#define TUNE_ATTR(name, check_zero) \
523static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
524{ \
525 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
526} \
527TUNE_ATTR_2(name, name##_store)
528
529TUNE_ATTR(quota_warn_period, 0);
530TUNE_ATTR(quota_quantum, 0);
531TUNE_ATTR(max_readahead, 0);
532TUNE_ATTR(complain_secs, 0);
533TUNE_ATTR(statfs_slow, 0);
534TUNE_ATTR(new_files_jdata, 0);
535TUNE_ATTR(quota_simul_sync, 1);
536TUNE_ATTR(statfs_quantum, 1);
537TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
538
539static struct attribute *tune_attrs[] = {
540 &tune_attr_quota_warn_period.attr,
541 &tune_attr_quota_quantum.attr,
542 &tune_attr_max_readahead.attr,
543 &tune_attr_complain_secs.attr,
544 &tune_attr_statfs_slow.attr,
545 &tune_attr_quota_simul_sync.attr,
546 &tune_attr_statfs_quantum.attr,
547 &tune_attr_quota_scale.attr,
548 &tune_attr_new_files_jdata.attr,
549 NULL,
550};
551
552static struct attribute_group tune_group = {
553 .name = "tune",
554 .attrs = tune_attrs,
555};
556
557static struct attribute_group lock_module_group = {
558 .name = "lock_module",
559 .attrs = lock_module_attrs,
560};
561
562int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
563{
564 struct super_block *sb = sdp->sd_vfs;
565 int error;
566 char ro[20];
567 char spectator[20];
568 char *envp[] = { ro, spectator, NULL };
569
570 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
571 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
572
573 sdp->sd_kobj.kset = gfs2_kset;
574 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
575 "%s", sdp->sd_table_name);
576 if (error)
577 goto fail;
578
579 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
580 if (error)
581 goto fail_reg;
582
583 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
584 if (error)
585 goto fail_tune;
586
587 error = sysfs_create_link(&sdp->sd_kobj,
588 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
589 "device");
590 if (error)
591 goto fail_lock_module;
592
593 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
594 return 0;
595
596fail_lock_module:
597 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
598fail_tune:
599 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
600fail_reg:
601 kobject_put(&sdp->sd_kobj);
602fail:
603 fs_err(sdp, "error %d adding sysfs files", error);
604 return error;
605}
606
607void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
608{
609 sysfs_remove_link(&sdp->sd_kobj, "device");
610 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
611 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
612 kobject_put(&sdp->sd_kobj);
613}
614
615static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
616 struct kobj_uevent_env *env)
617{
618 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
619 const u8 *uuid = sdp->sd_sb.sb_uuid;
620
621 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
622 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
623 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
624 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
625 if (gfs2_uuid_valid(uuid))
626 add_uevent_var(env, "UUID=%pUB", uuid);
627 return 0;
628}
629
630static const struct kset_uevent_ops gfs2_uevent_ops = {
631 .uevent = gfs2_uevent,
632};
633
634int gfs2_sys_init(void)
635{
636 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
637 if (!gfs2_kset)
638 return -ENOMEM;
639 return 0;
640}
641
642void gfs2_sys_uninit(void)
643{
644 kset_unregister(gfs2_kset);
645}
646