tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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
29struct gfs2_attr {
30 struct attribute attr;
31 ssize_t (*show)(struct gfs2_sbd *, char *);
32 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
33};
34
35static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
36 char *buf)
37{
38 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
39 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
40 return a->show ? a->show(sdp, buf) : 0;
41}
42
43static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
44 const char *buf, size_t len)
45{
46 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
47 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
48 return a->store ? a->store(sdp, buf, len) : len;
49}
50
51static const struct sysfs_ops gfs2_attr_ops = {
52 .show = gfs2_attr_show,
53 .store = gfs2_attr_store,
54};
55
56
57static struct kset *gfs2_kset;
58
59static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
60{
61 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
62 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
63}
64
65static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
66{
67 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
68}
69
70static int gfs2_uuid_valid(const u8 *uuid)
71{
72 int i;
73
74 for (i = 0; i < 16; i++) {
75 if (uuid[i])
76 return 1;
77 }
78 return 0;
79}
80
81static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
82{
83 const u8 *uuid = sdp->sd_sb.sb_uuid;
84 buf[0] = '\0';
85 if (!gfs2_uuid_valid(uuid))
86 return 0;
87 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
88}
89
90static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
91{
92 unsigned int count;
93
94 mutex_lock(&sdp->sd_freeze_lock);
95 count = sdp->sd_freeze_count;
96 mutex_unlock(&sdp->sd_freeze_lock);
97
98 return snprintf(buf, PAGE_SIZE, "%u\n", count);
99}
100
101static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
102{
103 ssize_t ret = len;
104 int error = 0;
105 int n = simple_strtol(buf, NULL, 0);
106
107 if (!capable(CAP_SYS_ADMIN))
108 return -EACCES;
109
110 switch (n) {
111 case 0:
112 gfs2_unfreeze_fs(sdp);
113 break;
114 case 1:
115 error = gfs2_freeze_fs(sdp);
116 break;
117 default:
118 ret = -EINVAL;
119 }
120
121 if (error)
122 fs_warn(sdp, "freeze %d error %d", n, error);
123
124 return ret;
125}
126
127static 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
133static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
134{
135 if (!capable(CAP_SYS_ADMIN))
136 return -EACCES;
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
147static 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 -EACCES;
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
160static 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 -EACCES;
165
166 if (simple_strtol(buf, NULL, 0) != 1)
167 return -EINVAL;
168
169 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
170 return len;
171}
172
173static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
174 size_t len)
175{
176 int error;
177 u32 id;
178
179 if (!capable(CAP_SYS_ADMIN))
180 return -EACCES;
181
182 id = simple_strtoul(buf, NULL, 0);
183
184 error = gfs2_quota_refresh(sdp, 1, id);
185 return error ? error : len;
186}
187
188static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
189 size_t len)
190{
191 int error;
192 u32 id;
193
194 if (!capable(CAP_SYS_ADMIN))
195 return -EACCES;
196
197 id = simple_strtoul(buf, NULL, 0);
198
199 error = gfs2_quota_refresh(sdp, 0, id);
200 return error ? error : len;
201}
202
203static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
204{
205 struct gfs2_glock *gl;
206 const struct gfs2_glock_operations *glops;
207 unsigned int glmode;
208 unsigned int gltype;
209 unsigned long long glnum;
210 char mode[16];
211 int rv;
212
213 if (!capable(CAP_SYS_ADMIN))
214 return -EACCES;
215
216 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
217 mode);
218 if (rv != 3)
219 return -EINVAL;
220
221 if (strcmp(mode, "EX") == 0)
222 glmode = LM_ST_UNLOCKED;
223 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
224 glmode = LM_ST_DEFERRED;
225 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
226 glmode = LM_ST_SHARED;
227 else
228 return -EINVAL;
229
230 if (gltype > LM_TYPE_JOURNAL)
231 return -EINVAL;
232 glops = gfs2_glops_list[gltype];
233 if (glops == NULL)
234 return -EINVAL;
235 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
236 fs_info(sdp, "demote interface used\n");
237 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
238 if (rv)
239 return rv;
240 gfs2_glock_cb(gl, glmode);
241 gfs2_glock_put(gl);
242 return len;
243}
244
245
246#define GFS2_ATTR(name, mode, show, store) \
247static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
248
249GFS2_ATTR(id, 0444, id_show, NULL);
250GFS2_ATTR(fsname, 0444, fsname_show, NULL);
251GFS2_ATTR(uuid, 0444, uuid_show, NULL);
252GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
253GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
254GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
255GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
256GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
257GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
258GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
259
260static struct attribute *gfs2_attrs[] = {
261 &gfs2_attr_id.attr,
262 &gfs2_attr_fsname.attr,
263 &gfs2_attr_uuid.attr,
264 &gfs2_attr_freeze.attr,
265 &gfs2_attr_withdraw.attr,
266 &gfs2_attr_statfs_sync.attr,
267 &gfs2_attr_quota_sync.attr,
268 &gfs2_attr_quota_refresh_user.attr,
269 &gfs2_attr_quota_refresh_group.attr,
270 &gfs2_attr_demote_rq.attr,
271 NULL,
272};
273
274static struct kobj_type gfs2_ktype = {
275 .default_attrs = gfs2_attrs,
276 .sysfs_ops = &gfs2_attr_ops,
277};
278
279
280/*
281 * lock_module. Originally from lock_dlm
282 */
283
284static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
285{
286 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
287 return sprintf(buf, "%s\n", ops->lm_proto_name);
288}
289
290static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
291{
292 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
293 ssize_t ret;
294 int val = 0;
295
296 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
297 val = 1;
298 ret = sprintf(buf, "%d\n", val);
299 return ret;
300}
301
302static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
303{
304 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
305 ssize_t ret = len;
306 int val;
307
308 val = simple_strtol(buf, NULL, 0);
309
310 if (val == 1)
311 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
312 else if (val == 0) {
313 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
314 smp_mb__after_clear_bit();
315 gfs2_glock_thaw(sdp);
316 } else {
317 ret = -EINVAL;
318 }
319 return ret;
320}
321
322static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
323{
324 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
325 return sprintf(buf, "%d\n", ls->ls_first);
326}
327
328static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
329{
330 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
331 return sprintf(buf, "%d\n", ls->ls_first_done);
332}
333
334static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
335{
336 unsigned jid;
337 struct gfs2_jdesc *jd;
338 int rv;
339
340 rv = sscanf(buf, "%u", &jid);
341 if (rv != 1)
342 return -EINVAL;
343
344 rv = -ESHUTDOWN;
345 spin_lock(&sdp->sd_jindex_spin);
346 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
347 goto out;
348 rv = -EBUSY;
349 if (sdp->sd_jdesc->jd_jid == jid)
350 goto out;
351 rv = -ENOENT;
352 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
353 if (jd->jd_jid != jid)
354 continue;
355 rv = slow_work_enqueue(&jd->jd_work);
356 break;
357 }
358out:
359 spin_unlock(&sdp->sd_jindex_spin);
360 return rv ? rv : len;
361}
362
363static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
364{
365 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
366 return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
367}
368
369static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
370{
371 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
372 return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
373}
374
375static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
376{
377 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
378}
379
380#define GDLM_ATTR(_name,_mode,_show,_store) \
381static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
382
383GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
384GDLM_ATTR(block, 0644, block_show, block_store);
385GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
386GDLM_ATTR(jid, 0444, jid_show, NULL);
387GDLM_ATTR(first, 0444, lkfirst_show, NULL);
388GDLM_ATTR(first_done, 0444, first_done_show, NULL);
389GDLM_ATTR(recover, 0600, NULL, recover_store);
390GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
391GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
392
393static struct attribute *lock_module_attrs[] = {
394 &gdlm_attr_proto_name.attr,
395 &gdlm_attr_block.attr,
396 &gdlm_attr_withdraw.attr,
397 &gdlm_attr_jid.attr,
398 &gdlm_attr_first.attr,
399 &gdlm_attr_first_done.attr,
400 &gdlm_attr_recover.attr,
401 &gdlm_attr_recover_done.attr,
402 &gdlm_attr_recover_status.attr,
403 NULL,
404};
405
406/*
407 * get and set struct gfs2_tune fields
408 */
409
410static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
411{
412 return snprintf(buf, PAGE_SIZE, "%u %u\n",
413 sdp->sd_tune.gt_quota_scale_num,
414 sdp->sd_tune.gt_quota_scale_den);
415}
416
417static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
418 size_t len)
419{
420 struct gfs2_tune *gt = &sdp->sd_tune;
421 unsigned int x, y;
422
423 if (!capable(CAP_SYS_ADMIN))
424 return -EACCES;
425
426 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
427 return -EINVAL;
428
429 spin_lock(>->gt_spin);
430 gt->gt_quota_scale_num = x;
431 gt->gt_quota_scale_den = y;
432 spin_unlock(>->gt_spin);
433 return len;
434}
435
436static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
437 int check_zero, const char *buf, size_t len)
438{
439 struct gfs2_tune *gt = &sdp->sd_tune;
440 unsigned int x;
441
442 if (!capable(CAP_SYS_ADMIN))
443 return -EACCES;
444
445 x = simple_strtoul(buf, NULL, 0);
446
447 if (check_zero && !x)
448 return -EINVAL;
449
450 spin_lock(>->gt_spin);
451 *field = x;
452 spin_unlock(>->gt_spin);
453 return len;
454}
455
456#define TUNE_ATTR_3(name, show, store) \
457static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
458
459#define TUNE_ATTR_2(name, store) \
460static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
461{ \
462 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
463} \
464TUNE_ATTR_3(name, name##_show, store)
465
466#define TUNE_ATTR(name, check_zero) \
467static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
468{ \
469 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
470} \
471TUNE_ATTR_2(name, name##_store)
472
473TUNE_ATTR(quota_warn_period, 0);
474TUNE_ATTR(quota_quantum, 0);
475TUNE_ATTR(max_readahead, 0);
476TUNE_ATTR(complain_secs, 0);
477TUNE_ATTR(statfs_slow, 0);
478TUNE_ATTR(new_files_jdata, 0);
479TUNE_ATTR(quota_simul_sync, 1);
480TUNE_ATTR(statfs_quantum, 1);
481TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
482
483static struct attribute *tune_attrs[] = {
484 &tune_attr_quota_warn_period.attr,
485 &tune_attr_quota_quantum.attr,
486 &tune_attr_max_readahead.attr,
487 &tune_attr_complain_secs.attr,
488 &tune_attr_statfs_slow.attr,
489 &tune_attr_quota_simul_sync.attr,
490 &tune_attr_statfs_quantum.attr,
491 &tune_attr_quota_scale.attr,
492 &tune_attr_new_files_jdata.attr,
493 NULL,
494};
495
496static struct attribute_group tune_group = {
497 .name = "tune",
498 .attrs = tune_attrs,
499};
500
501static struct attribute_group lock_module_group = {
502 .name = "lock_module",
503 .attrs = lock_module_attrs,
504};
505
506int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
507{
508 struct super_block *sb = sdp->sd_vfs;
509 int error;
510 char ro[20];
511 char spectator[20];
512 char *envp[] = { ro, spectator, NULL };
513
514 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
515 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
516
517 sdp->sd_kobj.kset = gfs2_kset;
518 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
519 "%s", sdp->sd_table_name);
520 if (error)
521 goto fail;
522
523 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
524 if (error)
525 goto fail_reg;
526
527 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
528 if (error)
529 goto fail_tune;
530
531 error = sysfs_create_link(&sdp->sd_kobj,
532 &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
533 "device");
534 if (error)
535 goto fail_lock_module;
536
537 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
538 return 0;
539
540fail_lock_module:
541 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
542fail_tune:
543 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
544fail_reg:
545 kobject_put(&sdp->sd_kobj);
546fail:
547 fs_err(sdp, "error %d adding sysfs files", error);
548 return error;
549}
550
551void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
552{
553 sysfs_remove_link(&sdp->sd_kobj, "device");
554 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
555 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
556 kobject_put(&sdp->sd_kobj);
557}
558
559static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
560 struct kobj_uevent_env *env)
561{
562 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
563 const u8 *uuid = sdp->sd_sb.sb_uuid;
564
565 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
566 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
567 if (!sdp->sd_args.ar_spectator)
568 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
569 if (gfs2_uuid_valid(uuid))
570 add_uevent_var(env, "UUID=%pUB", uuid);
571 return 0;
572}
573
574static const struct kset_uevent_ops gfs2_uevent_ops = {
575 .uevent = gfs2_uevent,
576};
577
578int gfs2_sys_init(void)
579{
580 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
581 if (!gfs2_kset)
582 return -ENOMEM;
583 return 0;
584}
585
586void gfs2_sys_uninit(void)
587{
588 kset_unregister(gfs2_kset);
589}
590