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-rw-r--r--fs/gfs2/sys.c583
1 files changed, 583 insertions, 0 deletions
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
new file mode 100644
index 000000000000..0e0ec988f731
--- /dev/null
+++ b/fs/gfs2/sys.c
@@ -0,0 +1,583 @@
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/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/module.h>
16#include <linux/kobject.h>
17#include <linux/gfs2_ondisk.h>
18#include <linux/lm_interface.h>
19#include <asm/uaccess.h>
20
21#include "gfs2.h"
22#include "incore.h"
23#include "lm.h"
24#include "sys.h"
25#include "super.h"
26#include "glock.h"
27#include "quota.h"
28#include "util.h"
29
30char *gfs2_sys_margs;
31spinlock_t gfs2_sys_margs_lock;
32
33static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
34{
35 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
36}
37
38static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
39{
40 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
41}
42
43static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
44{
45 unsigned int count;
46
47 mutex_lock(&sdp->sd_freeze_lock);
48 count = sdp->sd_freeze_count;
49 mutex_unlock(&sdp->sd_freeze_lock);
50
51 return snprintf(buf, PAGE_SIZE, "%u\n", count);
52}
53
54static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
55{
56 ssize_t ret = len;
57 int error = 0;
58 int n = simple_strtol(buf, NULL, 0);
59
60 if (!capable(CAP_SYS_ADMIN))
61 return -EACCES;
62
63 switch (n) {
64 case 0:
65 gfs2_unfreeze_fs(sdp);
66 break;
67 case 1:
68 error = gfs2_freeze_fs(sdp);
69 break;
70 default:
71 ret = -EINVAL;
72 }
73
74 if (error)
75 fs_warn(sdp, "freeze %d error %d", n, error);
76
77 return ret;
78}
79
80static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
81{
82 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
83 return snprintf(buf, PAGE_SIZE, "%u\n", b);
84}
85
86static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
87{
88 if (!capable(CAP_SYS_ADMIN))
89 return -EACCES;
90
91 if (simple_strtol(buf, NULL, 0) != 1)
92 return -EINVAL;
93
94 gfs2_lm_withdraw(sdp,
95 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
96 sdp->sd_fsname);
97 return len;
98}
99
100static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
101 size_t len)
102{
103 if (!capable(CAP_SYS_ADMIN))
104 return -EACCES;
105
106 if (simple_strtol(buf, NULL, 0) != 1)
107 return -EINVAL;
108
109 gfs2_statfs_sync(sdp);
110 return len;
111}
112
113static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
114{
115 if (!capable(CAP_SYS_ADMIN))
116 return -EACCES;
117
118 if (simple_strtol(buf, NULL, 0) != 1)
119 return -EINVAL;
120
121 gfs2_gl_hash_clear(sdp, NO_WAIT);
122 return len;
123}
124
125static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
126 size_t len)
127{
128 if (!capable(CAP_SYS_ADMIN))
129 return -EACCES;
130
131 if (simple_strtol(buf, NULL, 0) != 1)
132 return -EINVAL;
133
134 gfs2_quota_sync(sdp);
135 return len;
136}
137
138static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
139 size_t len)
140{
141 u32 id;
142
143 if (!capable(CAP_SYS_ADMIN))
144 return -EACCES;
145
146 id = simple_strtoul(buf, NULL, 0);
147
148 gfs2_quota_refresh(sdp, 1, id);
149 return len;
150}
151
152static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
153 size_t len)
154{
155 u32 id;
156
157 if (!capable(CAP_SYS_ADMIN))
158 return -EACCES;
159
160 id = simple_strtoul(buf, NULL, 0);
161
162 gfs2_quota_refresh(sdp, 0, id);
163 return len;
164}
165
166struct gfs2_attr {
167 struct attribute attr;
168 ssize_t (*show)(struct gfs2_sbd *, char *);
169 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
170};
171
172#define GFS2_ATTR(name, mode, show, store) \
173static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
174
175GFS2_ATTR(id, 0444, id_show, NULL);
176GFS2_ATTR(fsname, 0444, fsname_show, NULL);
177GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
178GFS2_ATTR(shrink, 0200, NULL, shrink_store);
179GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
180GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
181GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
182GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
183GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
184
185static struct attribute *gfs2_attrs[] = {
186 &gfs2_attr_id.attr,
187 &gfs2_attr_fsname.attr,
188 &gfs2_attr_freeze.attr,
189 &gfs2_attr_shrink.attr,
190 &gfs2_attr_withdraw.attr,
191 &gfs2_attr_statfs_sync.attr,
192 &gfs2_attr_quota_sync.attr,
193 &gfs2_attr_quota_refresh_user.attr,
194 &gfs2_attr_quota_refresh_group.attr,
195 NULL,
196};
197
198static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
199 char *buf)
200{
201 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
202 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
203 return a->show ? a->show(sdp, buf) : 0;
204}
205
206static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
207 const char *buf, size_t len)
208{
209 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
210 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
211 return a->store ? a->store(sdp, buf, len) : len;
212}
213
214static struct sysfs_ops gfs2_attr_ops = {
215 .show = gfs2_attr_show,
216 .store = gfs2_attr_store,
217};
218
219static struct kobj_type gfs2_ktype = {
220 .default_attrs = gfs2_attrs,
221 .sysfs_ops = &gfs2_attr_ops,
222};
223
224static struct kset gfs2_kset = {
225 .subsys = &fs_subsys,
226 .kobj = {.name = "gfs2"},
227 .ktype = &gfs2_ktype,
228};
229
230/*
231 * display struct lm_lockstruct fields
232 */
233
234struct lockstruct_attr {
235 struct attribute attr;
236 ssize_t (*show)(struct gfs2_sbd *, char *);
237};
238
239#define LOCKSTRUCT_ATTR(name, fmt) \
240static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
241{ \
242 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
243} \
244static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
245
246LOCKSTRUCT_ATTR(jid, "%u\n");
247LOCKSTRUCT_ATTR(first, "%u\n");
248LOCKSTRUCT_ATTR(lvb_size, "%u\n");
249LOCKSTRUCT_ATTR(flags, "%d\n");
250
251static struct attribute *lockstruct_attrs[] = {
252 &lockstruct_attr_jid.attr,
253 &lockstruct_attr_first.attr,
254 &lockstruct_attr_lvb_size.attr,
255 &lockstruct_attr_flags.attr,
256 NULL,
257};
258
259/*
260 * display struct gfs2_args fields
261 */
262
263struct args_attr {
264 struct attribute attr;
265 ssize_t (*show)(struct gfs2_sbd *, char *);
266};
267
268#define ARGS_ATTR(name, fmt) \
269static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
270{ \
271 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \
272} \
273static struct args_attr args_attr_##name = __ATTR_RO(name)
274
275ARGS_ATTR(lockproto, "%s\n");
276ARGS_ATTR(locktable, "%s\n");
277ARGS_ATTR(hostdata, "%s\n");
278ARGS_ATTR(spectator, "%d\n");
279ARGS_ATTR(ignore_local_fs, "%d\n");
280ARGS_ATTR(localcaching, "%d\n");
281ARGS_ATTR(localflocks, "%d\n");
282ARGS_ATTR(debug, "%d\n");
283ARGS_ATTR(upgrade, "%d\n");
284ARGS_ATTR(num_glockd, "%u\n");
285ARGS_ATTR(posix_acl, "%d\n");
286ARGS_ATTR(quota, "%u\n");
287ARGS_ATTR(suiddir, "%d\n");
288ARGS_ATTR(data, "%d\n");
289
290/* one oddball doesn't fit the macro mold */
291static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
292{
293 return snprintf(buf, PAGE_SIZE, "%d\n",
294 !!test_bit(SDF_NOATIME, &sdp->sd_flags));
295}
296static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
297
298static struct attribute *args_attrs[] = {
299 &args_attr_lockproto.attr,
300 &args_attr_locktable.attr,
301 &args_attr_hostdata.attr,
302 &args_attr_spectator.attr,
303 &args_attr_ignore_local_fs.attr,
304 &args_attr_localcaching.attr,
305 &args_attr_localflocks.attr,
306 &args_attr_debug.attr,
307 &args_attr_upgrade.attr,
308 &args_attr_num_glockd.attr,
309 &args_attr_posix_acl.attr,
310 &args_attr_quota.attr,
311 &args_attr_suiddir.attr,
312 &args_attr_data.attr,
313 &args_attr_noatime.attr,
314 NULL,
315};
316
317/*
318 * display counters from superblock
319 */
320
321struct counters_attr {
322 struct attribute attr;
323 ssize_t (*show)(struct gfs2_sbd *, char *);
324};
325
326#define COUNTERS_ATTR(name, fmt) \
327static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
328{ \
329 return snprintf(buf, PAGE_SIZE, fmt, \
330 (unsigned int)atomic_read(&sdp->sd_##name)); \
331} \
332static struct counters_attr counters_attr_##name = __ATTR_RO(name)
333
334COUNTERS_ATTR(glock_count, "%u\n");
335COUNTERS_ATTR(glock_held_count, "%u\n");
336COUNTERS_ATTR(inode_count, "%u\n");
337COUNTERS_ATTR(reclaimed, "%u\n");
338
339static struct attribute *counters_attrs[] = {
340 &counters_attr_glock_count.attr,
341 &counters_attr_glock_held_count.attr,
342 &counters_attr_inode_count.attr,
343 &counters_attr_reclaimed.attr,
344 NULL,
345};
346
347/*
348 * get and set struct gfs2_tune fields
349 */
350
351static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
352{
353 return snprintf(buf, PAGE_SIZE, "%u %u\n",
354 sdp->sd_tune.gt_quota_scale_num,
355 sdp->sd_tune.gt_quota_scale_den);
356}
357
358static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
359 size_t len)
360{
361 struct gfs2_tune *gt = &sdp->sd_tune;
362 unsigned int x, y;
363
364 if (!capable(CAP_SYS_ADMIN))
365 return -EACCES;
366
367 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
368 return -EINVAL;
369
370 spin_lock(&gt->gt_spin);
371 gt->gt_quota_scale_num = x;
372 gt->gt_quota_scale_den = y;
373 spin_unlock(&gt->gt_spin);
374 return len;
375}
376
377static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
378 int check_zero, const char *buf, size_t len)
379{
380 struct gfs2_tune *gt = &sdp->sd_tune;
381 unsigned int x;
382
383 if (!capable(CAP_SYS_ADMIN))
384 return -EACCES;
385
386 x = simple_strtoul(buf, NULL, 0);
387
388 if (check_zero && !x)
389 return -EINVAL;
390
391 spin_lock(&gt->gt_spin);
392 *field = x;
393 spin_unlock(&gt->gt_spin);
394 return len;
395}
396
397struct tune_attr {
398 struct attribute attr;
399 ssize_t (*show)(struct gfs2_sbd *, char *);
400 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
401};
402
403#define TUNE_ATTR_3(name, show, store) \
404static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
405
406#define TUNE_ATTR_2(name, store) \
407static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
408{ \
409 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
410} \
411TUNE_ATTR_3(name, name##_show, store)
412
413#define TUNE_ATTR(name, check_zero) \
414static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
415{ \
416 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
417} \
418TUNE_ATTR_2(name, name##_store)
419
420#define TUNE_ATTR_DAEMON(name, process) \
421static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
422{ \
423 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \
424 wake_up_process(sdp->sd_##process); \
425 return r; \
426} \
427TUNE_ATTR_2(name, name##_store)
428
429TUNE_ATTR(ilimit, 0);
430TUNE_ATTR(ilimit_tries, 0);
431TUNE_ATTR(ilimit_min, 0);
432TUNE_ATTR(demote_secs, 0);
433TUNE_ATTR(incore_log_blocks, 0);
434TUNE_ATTR(log_flush_secs, 0);
435TUNE_ATTR(jindex_refresh_secs, 0);
436TUNE_ATTR(quota_warn_period, 0);
437TUNE_ATTR(quota_quantum, 0);
438TUNE_ATTR(atime_quantum, 0);
439TUNE_ATTR(max_readahead, 0);
440TUNE_ATTR(complain_secs, 0);
441TUNE_ATTR(reclaim_limit, 0);
442TUNE_ATTR(prefetch_secs, 0);
443TUNE_ATTR(statfs_slow, 0);
444TUNE_ATTR(new_files_jdata, 0);
445TUNE_ATTR(new_files_directio, 0);
446TUNE_ATTR(quota_simul_sync, 1);
447TUNE_ATTR(quota_cache_secs, 1);
448TUNE_ATTR(max_atomic_write, 1);
449TUNE_ATTR(stall_secs, 1);
450TUNE_ATTR(entries_per_readdir, 1);
451TUNE_ATTR(greedy_default, 1);
452TUNE_ATTR(greedy_quantum, 1);
453TUNE_ATTR(greedy_max, 1);
454TUNE_ATTR(statfs_quantum, 1);
455TUNE_ATTR_DAEMON(scand_secs, scand_process);
456TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
457TUNE_ATTR_DAEMON(logd_secs, logd_process);
458TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
459TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
460
461static struct attribute *tune_attrs[] = {
462 &tune_attr_ilimit.attr,
463 &tune_attr_ilimit_tries.attr,
464 &tune_attr_ilimit_min.attr,
465 &tune_attr_demote_secs.attr,
466 &tune_attr_incore_log_blocks.attr,
467 &tune_attr_log_flush_secs.attr,
468 &tune_attr_jindex_refresh_secs.attr,
469 &tune_attr_quota_warn_period.attr,
470 &tune_attr_quota_quantum.attr,
471 &tune_attr_atime_quantum.attr,
472 &tune_attr_max_readahead.attr,
473 &tune_attr_complain_secs.attr,
474 &tune_attr_reclaim_limit.attr,
475 &tune_attr_prefetch_secs.attr,
476 &tune_attr_statfs_slow.attr,
477 &tune_attr_quota_simul_sync.attr,
478 &tune_attr_quota_cache_secs.attr,
479 &tune_attr_max_atomic_write.attr,
480 &tune_attr_stall_secs.attr,
481 &tune_attr_entries_per_readdir.attr,
482 &tune_attr_greedy_default.attr,
483 &tune_attr_greedy_quantum.attr,
484 &tune_attr_greedy_max.attr,
485 &tune_attr_statfs_quantum.attr,
486 &tune_attr_scand_secs.attr,
487 &tune_attr_recoverd_secs.attr,
488 &tune_attr_logd_secs.attr,
489 &tune_attr_quotad_secs.attr,
490 &tune_attr_quota_scale.attr,
491 &tune_attr_new_files_jdata.attr,
492 &tune_attr_new_files_directio.attr,
493 NULL,
494};
495
496static struct attribute_group lockstruct_group = {
497 .name = "lockstruct",
498 .attrs = lockstruct_attrs,
499};
500
501static struct attribute_group counters_group = {
502 .name = "counters",
503 .attrs = counters_attrs,
504};
505
506static struct attribute_group args_group = {
507 .name = "args",
508 .attrs = args_attrs,
509};
510
511static struct attribute_group tune_group = {
512 .name = "tune",
513 .attrs = tune_attrs,
514};
515
516int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
517{
518 int error;
519
520 sdp->sd_kobj.kset = &gfs2_kset;
521 sdp->sd_kobj.ktype = &gfs2_ktype;
522
523 error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
524 if (error)
525 goto fail;
526
527 error = kobject_register(&sdp->sd_kobj);
528 if (error)
529 goto fail;
530
531 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
532 if (error)
533 goto fail_reg;
534
535 error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
536 if (error)
537 goto fail_lockstruct;
538
539 error = sysfs_create_group(&sdp->sd_kobj, &args_group);
540 if (error)
541 goto fail_counters;
542
543 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
544 if (error)
545 goto fail_args;
546
547 return 0;
548
549fail_args:
550 sysfs_remove_group(&sdp->sd_kobj, &args_group);
551fail_counters:
552 sysfs_remove_group(&sdp->sd_kobj, &counters_group);
553fail_lockstruct:
554 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
555fail_reg:
556 kobject_unregister(&sdp->sd_kobj);
557fail:
558 fs_err(sdp, "error %d adding sysfs files", error);
559 return error;
560}
561
562void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
563{
564 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
565 sysfs_remove_group(&sdp->sd_kobj, &args_group);
566 sysfs_remove_group(&sdp->sd_kobj, &counters_group);
567 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
568 kobject_unregister(&sdp->sd_kobj);
569}
570
571int gfs2_sys_init(void)
572{
573 gfs2_sys_margs = NULL;
574 spin_lock_init(&gfs2_sys_margs_lock);
575 return kset_register(&gfs2_kset);
576}
577
578void gfs2_sys_uninit(void)
579{
580 kfree(gfs2_sys_margs);
581 kset_unregister(&gfs2_kset);
582}
583
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