/linux-2.6.29/fs/gfs2/sys.c
C | 487 lines | 386 code | 84 blank | 17 comment | 26 complexity | 5618d018a69a6c38e2beb89c42084d07 MD5 | raw file
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 "sys.h"
24#include "super.h"
25#include "glock.h"
26#include "quota.h"
27#include "util.h"
28
29static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
30{
31 return snprintf(buf, PAGE_SIZE, "%u:%u\n",
32 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
33}
34
35static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
36{
37 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
38}
39
40static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
41{
42 unsigned int count;
43
44 mutex_lock(&sdp->sd_freeze_lock);
45 count = sdp->sd_freeze_count;
46 mutex_unlock(&sdp->sd_freeze_lock);
47
48 return snprintf(buf, PAGE_SIZE, "%u\n", count);
49}
50
51static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
52{
53 ssize_t ret = len;
54 int error = 0;
55 int n = simple_strtol(buf, NULL, 0);
56
57 if (!capable(CAP_SYS_ADMIN))
58 return -EACCES;
59
60 switch (n) {
61 case 0:
62 gfs2_unfreeze_fs(sdp);
63 break;
64 case 1:
65 error = gfs2_freeze_fs(sdp);
66 break;
67 default:
68 ret = -EINVAL;
69 }
70
71 if (error)
72 fs_warn(sdp, "freeze %d error %d", n, error);
73
74 return ret;
75}
76
77static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
78{
79 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
80 return snprintf(buf, PAGE_SIZE, "%u\n", b);
81}
82
83static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
84{
85 if (!capable(CAP_SYS_ADMIN))
86 return -EACCES;
87
88 if (simple_strtol(buf, NULL, 0) != 1)
89 return -EINVAL;
90
91 gfs2_lm_withdraw(sdp,
92 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
93 sdp->sd_fsname);
94 return len;
95}
96
97static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
98 size_t len)
99{
100 if (!capable(CAP_SYS_ADMIN))
101 return -EACCES;
102
103 if (simple_strtol(buf, NULL, 0) != 1)
104 return -EINVAL;
105
106 gfs2_statfs_sync(sdp);
107 return len;
108}
109
110static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
111 size_t len)
112{
113 if (!capable(CAP_SYS_ADMIN))
114 return -EACCES;
115
116 if (simple_strtol(buf, NULL, 0) != 1)
117 return -EINVAL;
118
119 gfs2_quota_sync(sdp);
120 return len;
121}
122
123static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
124 size_t len)
125{
126 u32 id;
127
128 if (!capable(CAP_SYS_ADMIN))
129 return -EACCES;
130
131 id = simple_strtoul(buf, NULL, 0);
132
133 gfs2_quota_refresh(sdp, 1, id);
134 return len;
135}
136
137static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
138 size_t len)
139{
140 u32 id;
141
142 if (!capable(CAP_SYS_ADMIN))
143 return -EACCES;
144
145 id = simple_strtoul(buf, NULL, 0);
146
147 gfs2_quota_refresh(sdp, 0, id);
148 return len;
149}
150
151struct gfs2_attr {
152 struct attribute attr;
153 ssize_t (*show)(struct gfs2_sbd *, char *);
154 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
155};
156
157#define GFS2_ATTR(name, mode, show, store) \
158static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
159
160GFS2_ATTR(id, 0444, id_show, NULL);
161GFS2_ATTR(fsname, 0444, fsname_show, NULL);
162GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
163GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
164GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
165GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
166GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
167GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
168
169static struct attribute *gfs2_attrs[] = {
170 &gfs2_attr_id.attr,
171 &gfs2_attr_fsname.attr,
172 &gfs2_attr_freeze.attr,
173 &gfs2_attr_withdraw.attr,
174 &gfs2_attr_statfs_sync.attr,
175 &gfs2_attr_quota_sync.attr,
176 &gfs2_attr_quota_refresh_user.attr,
177 &gfs2_attr_quota_refresh_group.attr,
178 NULL,
179};
180
181static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
182 char *buf)
183{
184 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
185 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
186 return a->show ? a->show(sdp, buf) : 0;
187}
188
189static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
190 const char *buf, size_t len)
191{
192 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
193 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
194 return a->store ? a->store(sdp, buf, len) : len;
195}
196
197static struct sysfs_ops gfs2_attr_ops = {
198 .show = gfs2_attr_show,
199 .store = gfs2_attr_store,
200};
201
202static struct kobj_type gfs2_ktype = {
203 .default_attrs = gfs2_attrs,
204 .sysfs_ops = &gfs2_attr_ops,
205};
206
207static struct kset *gfs2_kset;
208
209/*
210 * display struct lm_lockstruct fields
211 */
212
213struct lockstruct_attr {
214 struct attribute attr;
215 ssize_t (*show)(struct gfs2_sbd *, char *);
216};
217
218#define LOCKSTRUCT_ATTR(name, fmt) \
219static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
220{ \
221 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
222} \
223static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
224
225LOCKSTRUCT_ATTR(jid, "%u\n");
226LOCKSTRUCT_ATTR(first, "%u\n");
227LOCKSTRUCT_ATTR(lvb_size, "%u\n");
228LOCKSTRUCT_ATTR(flags, "%d\n");
229
230static struct attribute *lockstruct_attrs[] = {
231 &lockstruct_attr_jid.attr,
232 &lockstruct_attr_first.attr,
233 &lockstruct_attr_lvb_size.attr,
234 &lockstruct_attr_flags.attr,
235 NULL,
236};
237
238/*
239 * display struct gfs2_args fields
240 */
241
242struct args_attr {
243 struct attribute attr;
244 ssize_t (*show)(struct gfs2_sbd *, char *);
245};
246
247#define ARGS_ATTR(name, fmt) \
248static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
249{ \
250 return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \
251} \
252static struct args_attr args_attr_##name = __ATTR_RO(name)
253
254ARGS_ATTR(lockproto, "%s\n");
255ARGS_ATTR(locktable, "%s\n");
256ARGS_ATTR(hostdata, "%s\n");
257ARGS_ATTR(spectator, "%d\n");
258ARGS_ATTR(ignore_local_fs, "%d\n");
259ARGS_ATTR(localcaching, "%d\n");
260ARGS_ATTR(localflocks, "%d\n");
261ARGS_ATTR(debug, "%d\n");
262ARGS_ATTR(upgrade, "%d\n");
263ARGS_ATTR(posix_acl, "%d\n");
264ARGS_ATTR(quota, "%u\n");
265ARGS_ATTR(suiddir, "%d\n");
266ARGS_ATTR(data, "%d\n");
267
268static struct attribute *args_attrs[] = {
269 &args_attr_lockproto.attr,
270 &args_attr_locktable.attr,
271 &args_attr_hostdata.attr,
272 &args_attr_spectator.attr,
273 &args_attr_ignore_local_fs.attr,
274 &args_attr_localcaching.attr,
275 &args_attr_localflocks.attr,
276 &args_attr_debug.attr,
277 &args_attr_upgrade.attr,
278 &args_attr_posix_acl.attr,
279 &args_attr_quota.attr,
280 &args_attr_suiddir.attr,
281 &args_attr_data.attr,
282 NULL,
283};
284
285/*
286 * get and set struct gfs2_tune fields
287 */
288
289static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
290{
291 return snprintf(buf, PAGE_SIZE, "%u %u\n",
292 sdp->sd_tune.gt_quota_scale_num,
293 sdp->sd_tune.gt_quota_scale_den);
294}
295
296static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
297 size_t len)
298{
299 struct gfs2_tune *gt = &sdp->sd_tune;
300 unsigned int x, y;
301
302 if (!capable(CAP_SYS_ADMIN))
303 return -EACCES;
304
305 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
306 return -EINVAL;
307
308 spin_lock(>->gt_spin);
309 gt->gt_quota_scale_num = x;
310 gt->gt_quota_scale_den = y;
311 spin_unlock(>->gt_spin);
312 return len;
313}
314
315static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
316 int check_zero, const char *buf, size_t len)
317{
318 struct gfs2_tune *gt = &sdp->sd_tune;
319 unsigned int x;
320
321 if (!capable(CAP_SYS_ADMIN))
322 return -EACCES;
323
324 x = simple_strtoul(buf, NULL, 0);
325
326 if (check_zero && !x)
327 return -EINVAL;
328
329 spin_lock(>->gt_spin);
330 *field = x;
331 spin_unlock(>->gt_spin);
332 return len;
333}
334
335struct tune_attr {
336 struct attribute attr;
337 ssize_t (*show)(struct gfs2_sbd *, char *);
338 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
339};
340
341#define TUNE_ATTR_3(name, show, store) \
342static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
343
344#define TUNE_ATTR_2(name, store) \
345static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
346{ \
347 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
348} \
349TUNE_ATTR_3(name, name##_show, store)
350
351#define TUNE_ATTR(name, check_zero) \
352static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
353{ \
354 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
355} \
356TUNE_ATTR_2(name, name##_store)
357
358#define TUNE_ATTR_DAEMON(name, process) \
359static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
360{ \
361 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \
362 wake_up_process(sdp->sd_##process); \
363 return r; \
364} \
365TUNE_ATTR_2(name, name##_store)
366
367TUNE_ATTR(incore_log_blocks, 0);
368TUNE_ATTR(log_flush_secs, 0);
369TUNE_ATTR(quota_warn_period, 0);
370TUNE_ATTR(quota_quantum, 0);
371TUNE_ATTR(max_readahead, 0);
372TUNE_ATTR(complain_secs, 0);
373TUNE_ATTR(statfs_slow, 0);
374TUNE_ATTR(new_files_jdata, 0);
375TUNE_ATTR(quota_simul_sync, 1);
376TUNE_ATTR(quota_cache_secs, 1);
377TUNE_ATTR(stall_secs, 1);
378TUNE_ATTR(statfs_quantum, 1);
379TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
380TUNE_ATTR_DAEMON(logd_secs, logd_process);
381TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
382
383static struct attribute *tune_attrs[] = {
384 &tune_attr_incore_log_blocks.attr,
385 &tune_attr_log_flush_secs.attr,
386 &tune_attr_quota_warn_period.attr,
387 &tune_attr_quota_quantum.attr,
388 &tune_attr_max_readahead.attr,
389 &tune_attr_complain_secs.attr,
390 &tune_attr_statfs_slow.attr,
391 &tune_attr_quota_simul_sync.attr,
392 &tune_attr_quota_cache_secs.attr,
393 &tune_attr_stall_secs.attr,
394 &tune_attr_statfs_quantum.attr,
395 &tune_attr_recoverd_secs.attr,
396 &tune_attr_logd_secs.attr,
397 &tune_attr_quota_scale.attr,
398 &tune_attr_new_files_jdata.attr,
399 NULL,
400};
401
402static struct attribute_group lockstruct_group = {
403 .name = "lockstruct",
404 .attrs = lockstruct_attrs,
405};
406
407static struct attribute_group args_group = {
408 .name = "args",
409 .attrs = args_attrs,
410};
411
412static struct attribute_group tune_group = {
413 .name = "tune",
414 .attrs = tune_attrs,
415};
416
417int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
418{
419 int error;
420
421 sdp->sd_kobj.kset = gfs2_kset;
422 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
423 "%s", sdp->sd_table_name);
424 if (error)
425 goto fail;
426
427 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
428 if (error)
429 goto fail_reg;
430
431 error = sysfs_create_group(&sdp->sd_kobj, &args_group);
432 if (error)
433 goto fail_lockstruct;
434
435 error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
436 if (error)
437 goto fail_args;
438
439 kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
440 return 0;
441
442fail_args:
443 sysfs_remove_group(&sdp->sd_kobj, &args_group);
444fail_lockstruct:
445 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
446fail_reg:
447 kobject_put(&sdp->sd_kobj);
448fail:
449 fs_err(sdp, "error %d adding sysfs files", error);
450 return error;
451}
452
453void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
454{
455 sysfs_remove_group(&sdp->sd_kobj, &tune_group);
456 sysfs_remove_group(&sdp->sd_kobj, &args_group);
457 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
458 kobject_put(&sdp->sd_kobj);
459}
460
461static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
462 struct kobj_uevent_env *env)
463{
464 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
465 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
466 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
467 return 0;
468}
469
470static struct kset_uevent_ops gfs2_uevent_ops = {
471 .uevent = gfs2_uevent,
472};
473
474
475int gfs2_sys_init(void)
476{
477 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
478 if (!gfs2_kset)
479 return -ENOMEM;
480 return 0;
481}
482
483void gfs2_sys_uninit(void)
484{
485 kset_unregister(gfs2_kset);
486}
487