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	.kobj   = {.name = "gfs2"},
226	.ktype  = &gfs2_ktype,
227};
228
229/*
230 * display struct lm_lockstruct fields
231 */
232
233struct lockstruct_attr {
234	struct attribute attr;
235	ssize_t (*show)(struct gfs2_sbd *, char *);
236};
237
238#define LOCKSTRUCT_ATTR(name, fmt)                                          \
239static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
240{                                                                           \
241	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
242}                                                                           \
243static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
244
245LOCKSTRUCT_ATTR(jid,      "%u\n");
246LOCKSTRUCT_ATTR(first,    "%u\n");
247LOCKSTRUCT_ATTR(lvb_size, "%u\n");
248LOCKSTRUCT_ATTR(flags,    "%d\n");
249
250static struct attribute *lockstruct_attrs[] = {
251	&lockstruct_attr_jid.attr,
252	&lockstruct_attr_first.attr,
253	&lockstruct_attr_lvb_size.attr,
254	&lockstruct_attr_flags.attr,
255	NULL,
256};
257
258/*
259 * display struct gfs2_args fields
260 */
261
262struct args_attr {
263	struct attribute attr;
264	ssize_t (*show)(struct gfs2_sbd *, char *);
265};
266
267#define ARGS_ATTR(name, fmt)                                                \
268static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
269{                                                                           \
270	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
271}                                                                           \
272static struct args_attr args_attr_##name = __ATTR_RO(name)
273
274ARGS_ATTR(lockproto,       "%s\n");
275ARGS_ATTR(locktable,       "%s\n");
276ARGS_ATTR(hostdata,        "%s\n");
277ARGS_ATTR(spectator,       "%d\n");
278ARGS_ATTR(ignore_local_fs, "%d\n");
279ARGS_ATTR(localcaching,    "%d\n");
280ARGS_ATTR(localflocks,     "%d\n");
281ARGS_ATTR(debug,           "%d\n");
282ARGS_ATTR(upgrade,         "%d\n");
283ARGS_ATTR(num_glockd,      "%u\n");
284ARGS_ATTR(posix_acl,       "%d\n");
285ARGS_ATTR(quota,           "%u\n");
286ARGS_ATTR(suiddir,         "%d\n");
287ARGS_ATTR(data,            "%d\n");
288
289/* one oddball doesn't fit the macro mold */
290static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
291{
292	return snprintf(buf, PAGE_SIZE, "%d\n",
293			!!test_bit(SDF_NOATIME, &sdp->sd_flags));
294}
295static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
296
297static struct attribute *args_attrs[] = {
298	&args_attr_lockproto.attr,
299	&args_attr_locktable.attr,
300	&args_attr_hostdata.attr,
301	&args_attr_spectator.attr,
302	&args_attr_ignore_local_fs.attr,
303	&args_attr_localcaching.attr,
304	&args_attr_localflocks.attr,
305	&args_attr_debug.attr,
306	&args_attr_upgrade.attr,
307	&args_attr_num_glockd.attr,
308	&args_attr_posix_acl.attr,
309	&args_attr_quota.attr,
310	&args_attr_suiddir.attr,
311	&args_attr_data.attr,
312	&args_attr_noatime.attr,
313	NULL,
314};
315
316/*
317 * display counters from superblock
318 */
319
320struct counters_attr {
321	struct attribute attr;
322	ssize_t (*show)(struct gfs2_sbd *, char *);
323};
324
325#define COUNTERS_ATTR(name, fmt)                                            \
326static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
327{                                                                           \
328	return snprintf(buf, PAGE_SIZE, fmt,                                \
329			(unsigned int)atomic_read(&sdp->sd_##name));        \
330}                                                                           \
331static struct counters_attr counters_attr_##name = __ATTR_RO(name)
332
333COUNTERS_ATTR(glock_count,      "%u\n");
334COUNTERS_ATTR(glock_held_count, "%u\n");
335COUNTERS_ATTR(inode_count,      "%u\n");
336COUNTERS_ATTR(reclaimed,        "%u\n");
337
338static struct attribute *counters_attrs[] = {
339	&counters_attr_glock_count.attr,
340	&counters_attr_glock_held_count.attr,
341	&counters_attr_inode_count.attr,
342	&counters_attr_reclaimed.attr,
343	NULL,
344};
345
346/*
347 * get and set struct gfs2_tune fields
348 */
349
350static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
351{
352	return snprintf(buf, PAGE_SIZE, "%u %u\n",
353			sdp->sd_tune.gt_quota_scale_num,
354			sdp->sd_tune.gt_quota_scale_den);
355}
356
357static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
358				 size_t len)
359{
360	struct gfs2_tune *gt = &sdp->sd_tune;
361	unsigned int x, y;
362
363	if (!capable(CAP_SYS_ADMIN))
364		return -EACCES;
365
366	if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
367		return -EINVAL;
368
369	spin_lock(&gt->gt_spin);
370	gt->gt_quota_scale_num = x;
371	gt->gt_quota_scale_den = y;
372	spin_unlock(&gt->gt_spin);
373	return len;
374}
375
376static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
377			int check_zero, const char *buf, size_t len)
378{
379	struct gfs2_tune *gt = &sdp->sd_tune;
380	unsigned int x;
381
382	if (!capable(CAP_SYS_ADMIN))
383		return -EACCES;
384
385	x = simple_strtoul(buf, NULL, 0);
386
387	if (check_zero && !x)
388		return -EINVAL;
389
390	spin_lock(&gt->gt_spin);
391	*field = x;
392	spin_unlock(&gt->gt_spin);
393	return len;
394}
395
396struct tune_attr {
397	struct attribute attr;
398	ssize_t (*show)(struct gfs2_sbd *, char *);
399	ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
400};
401
402#define TUNE_ATTR_3(name, show, store)                                        \
403static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
404
405#define TUNE_ATTR_2(name, store)                                              \
406static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
407{                                                                             \
408	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
409}                                                                             \
410TUNE_ATTR_3(name, name##_show, store)
411
412#define TUNE_ATTR(name, check_zero)                                           \
413static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
414{                                                                             \
415	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
416}                                                                             \
417TUNE_ATTR_2(name, name##_store)
418
419#define TUNE_ATTR_DAEMON(name, process)                                       \
420static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
421{                                                                             \
422	ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
423	wake_up_process(sdp->sd_##process);                                   \
424	return r;                                                             \
425}                                                                             \
426TUNE_ATTR_2(name, name##_store)
427
428TUNE_ATTR(demote_secs, 0);
429TUNE_ATTR(incore_log_blocks, 0);
430TUNE_ATTR(log_flush_secs, 0);
431TUNE_ATTR(jindex_refresh_secs, 0);
432TUNE_ATTR(quota_warn_period, 0);
433TUNE_ATTR(quota_quantum, 0);
434TUNE_ATTR(atime_quantum, 0);
435TUNE_ATTR(max_readahead, 0);
436TUNE_ATTR(complain_secs, 0);
437TUNE_ATTR(reclaim_limit, 0);
438TUNE_ATTR(statfs_slow, 0);
439TUNE_ATTR(new_files_jdata, 0);
440TUNE_ATTR(new_files_directio, 0);
441TUNE_ATTR(quota_simul_sync, 1);
442TUNE_ATTR(quota_cache_secs, 1);
443TUNE_ATTR(stall_secs, 1);
444TUNE_ATTR(statfs_quantum, 1);
445TUNE_ATTR_DAEMON(scand_secs, scand_process);
446TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
447TUNE_ATTR_DAEMON(logd_secs, logd_process);
448TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
449TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
450
451static struct attribute *tune_attrs[] = {
452	&tune_attr_demote_secs.attr,
453	&tune_attr_incore_log_blocks.attr,
454	&tune_attr_log_flush_secs.attr,
455	&tune_attr_jindex_refresh_secs.attr,
456	&tune_attr_quota_warn_period.attr,
457	&tune_attr_quota_quantum.attr,
458	&tune_attr_atime_quantum.attr,
459	&tune_attr_max_readahead.attr,
460	&tune_attr_complain_secs.attr,
461	&tune_attr_reclaim_limit.attr,
462	&tune_attr_statfs_slow.attr,
463	&tune_attr_quota_simul_sync.attr,
464	&tune_attr_quota_cache_secs.attr,
465	&tune_attr_stall_secs.attr,
466	&tune_attr_statfs_quantum.attr,
467	&tune_attr_scand_secs.attr,
468	&tune_attr_recoverd_secs.attr,
469	&tune_attr_logd_secs.attr,
470	&tune_attr_quotad_secs.attr,
471	&tune_attr_quota_scale.attr,
472	&tune_attr_new_files_jdata.attr,
473	&tune_attr_new_files_directio.attr,
474	NULL,
475};
476
477static struct attribute_group lockstruct_group = {
478	.name = "lockstruct",
479	.attrs = lockstruct_attrs,
480};
481
482static struct attribute_group counters_group = {
483	.name = "counters",
484	.attrs = counters_attrs,
485};
486
487static struct attribute_group args_group = {
488	.name = "args",
489	.attrs = args_attrs,
490};
491
492static struct attribute_group tune_group = {
493	.name = "tune",
494	.attrs = tune_attrs,
495};
496
497int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
498{
499	int error;
500
501	sdp->sd_kobj.kset = &gfs2_kset;
502	sdp->sd_kobj.ktype = &gfs2_ktype;
503
504	error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
505	if (error)
506		goto fail;
507
508	error = kobject_register(&sdp->sd_kobj);
509	if (error)
510		goto fail;
511
512	error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
513	if (error)
514		goto fail_reg;
515
516	error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
517	if (error)
518		goto fail_lockstruct;
519
520	error = sysfs_create_group(&sdp->sd_kobj, &args_group);
521	if (error)
522		goto fail_counters;
523
524	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
525	if (error)
526		goto fail_args;
527
528	return 0;
529
530fail_args:
531	sysfs_remove_group(&sdp->sd_kobj, &args_group);
532fail_counters:
533	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
534fail_lockstruct:
535	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
536fail_reg:
537	kobject_unregister(&sdp->sd_kobj);
538fail:
539	fs_err(sdp, "error %d adding sysfs files", error);
540	return error;
541}
542
543void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
544{
545	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
546	sysfs_remove_group(&sdp->sd_kobj, &args_group);
547	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
548	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
549	kobject_unregister(&sdp->sd_kobj);
550}
551
552int gfs2_sys_init(void)
553{
554	gfs2_sys_margs = NULL;
555	spin_lock_init(&gfs2_sys_margs_lock);
556	kobj_set_kset_s(&gfs2_kset, fs_subsys);
557	return kset_register(&gfs2_kset);
558}
559
560void gfs2_sys_uninit(void)
561{
562	kfree(gfs2_sys_margs);
563	kset_unregister(&gfs2_kset);
564}
565