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