bbfa9e16abc33a73767f87405bb1793fc07bf572
[linux-2.6.git] / fs / gfs2 / sys.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2005 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 v.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 <asm/uaccess.h>
19
20 #include "gfs2.h"
21 #include "lm_interface.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
30 char *gfs2_sys_margs;
31 spinlock_t gfs2_sys_margs_lock;
32
33 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
34 {
35         return sprintf(buf, "%s\n", sdp->sd_vfs->s_id);
36 }
37
38 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
39 {
40         return sprintf(buf, "%s\n", sdp->sd_fsname);
41 }
42
43 static 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 sprintf(buf, "%u\n", count);
52 }
53
54 static 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
80 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
81 {
82         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
83         return sprintf(buf, "%u\n", b);
84 }
85
86 static 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
100 static 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
113 static 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
125 static 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
138 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
139                                         size_t len)
140 {
141         uint32_t 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
152 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
153                                          size_t len)
154 {
155         uint32_t 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
166 struct 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) \
173 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
174
175 GFS2_ATTR(id,                  0444, id_show,       NULL);
176 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
177 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
178 GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
179 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
180 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
181 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
182 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
183 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
184
185 static 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
198 static 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
206 static 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
214 static struct sysfs_ops gfs2_attr_ops = {
215         .show  = gfs2_attr_show,
216         .store = gfs2_attr_store,
217 };
218
219 static struct kobj_type gfs2_ktype = {
220         .default_attrs = gfs2_attrs,
221         .sysfs_ops     = &gfs2_attr_ops,
222 };
223
224 static 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
234 struct lockstruct_attr {
235         struct attribute attr;
236         ssize_t (*show)(struct gfs2_sbd *, char *);
237 };
238
239 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
240 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
241 {                                                                           \
242         return sprintf(buf, fmt, sdp->sd_lockstruct.ls_##name);             \
243 }                                                                           \
244 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
245
246 LOCKSTRUCT_ATTR(jid,      "%u\n");
247 LOCKSTRUCT_ATTR(first,    "%u\n");
248 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
249 LOCKSTRUCT_ATTR(flags,    "%d\n");
250
251 static 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
263 struct args_attr {
264         struct attribute attr;
265         ssize_t (*show)(struct gfs2_sbd *, char *);
266 };
267
268 #define ARGS_ATTR(name, fmt)                                                \
269 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
270 {                                                                           \
271         return sprintf(buf, fmt, sdp->sd_args.ar_##name);                   \
272 }                                                                           \
273 static struct args_attr args_attr_##name = __ATTR_RO(name)
274
275 ARGS_ATTR(lockproto,       "%s\n");
276 ARGS_ATTR(locktable,       "%s\n");
277 ARGS_ATTR(hostdata,        "%s\n");
278 ARGS_ATTR(spectator,       "%d\n");
279 ARGS_ATTR(ignore_local_fs, "%d\n");
280 ARGS_ATTR(localcaching,    "%d\n");
281 ARGS_ATTR(localflocks,     "%d\n");
282 ARGS_ATTR(debug,           "%d\n");
283 ARGS_ATTR(upgrade,         "%d\n");
284 ARGS_ATTR(num_glockd,      "%u\n");
285 ARGS_ATTR(posix_acl,       "%d\n");
286 ARGS_ATTR(quota,           "%u\n");
287 ARGS_ATTR(suiddir,         "%d\n");
288 ARGS_ATTR(data,            "%d\n");
289
290 /* one oddball doesn't fit the macro mold */
291 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
292 {
293         return sprintf(buf, "%d\n", !!test_bit(SDF_NOATIME, &sdp->sd_flags));
294 }
295 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
296
297 static 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
320 struct counters_attr {
321         struct attribute attr;
322         ssize_t (*show)(struct gfs2_sbd *, char *);
323 };
324
325 #define COUNTERS_ATTR(name, fmt)                                            \
326 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
327 {                                                                           \
328         return sprintf(buf, fmt, (unsigned int)atomic_read(&sdp->sd_##name)); \
329 }                                                                           \
330 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
331
332 COUNTERS_ATTR(glock_count,      "%u\n");
333 COUNTERS_ATTR(glock_held_count, "%u\n");
334 COUNTERS_ATTR(inode_count,      "%u\n");
335 COUNTERS_ATTR(reclaimed,        "%u\n");
336
337 static struct attribute *counters_attrs[] = {
338         &counters_attr_glock_count.attr,
339         &counters_attr_glock_held_count.attr,
340         &counters_attr_inode_count.attr,
341         &counters_attr_reclaimed.attr,
342         NULL
343 };
344
345 /*
346  * get and set struct gfs2_tune fields
347  */
348
349 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
350 {
351         return sprintf(buf, "%u %u\n", sdp->sd_tune.gt_quota_scale_num,
352                                        sdp->sd_tune.gt_quota_scale_den);
353 }
354
355 static 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->gt_spin);
368         gt->gt_quota_scale_num = x;
369         gt->gt_quota_scale_den = y;
370         spin_unlock(&gt->gt_spin);
371         return len;
372 }
373
374 static 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->gt_spin);
389         *field = x;
390         spin_unlock(&gt->gt_spin);
391         return len;
392 }
393
394 struct 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)                                        \
401 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
402
403 #define TUNE_ATTR_2(name, store)                                              \
404 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
405 {                                                                             \
406         return sprintf(buf, "%u\n", sdp->sd_tune.gt_##name);                  \
407 }                                                                             \
408 TUNE_ATTR_3(name, name##_show, store)
409
410 #define TUNE_ATTR(name, check_zero)                                           \
411 static 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 }                                                                             \
415 TUNE_ATTR_2(name, name##_store)
416
417 #define TUNE_ATTR_DAEMON(name, process)                                       \
418 static 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 }                                                                             \
424 TUNE_ATTR_2(name, name##_store)
425
426 TUNE_ATTR(ilimit, 0);
427 TUNE_ATTR(ilimit_tries, 0);
428 TUNE_ATTR(ilimit_min, 0);
429 TUNE_ATTR(demote_secs, 0);
430 TUNE_ATTR(incore_log_blocks, 0);
431 TUNE_ATTR(log_flush_secs, 0);
432 TUNE_ATTR(jindex_refresh_secs, 0);
433 TUNE_ATTR(quota_warn_period, 0);
434 TUNE_ATTR(quota_quantum, 0);
435 TUNE_ATTR(atime_quantum, 0);
436 TUNE_ATTR(max_readahead, 0);
437 TUNE_ATTR(complain_secs, 0);
438 TUNE_ATTR(reclaim_limit, 0);
439 TUNE_ATTR(prefetch_secs, 0);
440 TUNE_ATTR(statfs_slow, 0);
441 TUNE_ATTR(new_files_jdata, 0);
442 TUNE_ATTR(new_files_directio, 0);
443 TUNE_ATTR(quota_simul_sync, 1);
444 TUNE_ATTR(quota_cache_secs, 1);
445 TUNE_ATTR(max_atomic_write, 1);
446 TUNE_ATTR(stall_secs, 1);
447 TUNE_ATTR(entries_per_readdir, 1);
448 TUNE_ATTR(greedy_default, 1);
449 TUNE_ATTR(greedy_quantum, 1);
450 TUNE_ATTR(greedy_max, 1);
451 TUNE_ATTR(statfs_quantum, 1);
452 TUNE_ATTR_DAEMON(scand_secs, scand_process);
453 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
454 TUNE_ATTR_DAEMON(logd_secs, logd_process);
455 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
456 TUNE_ATTR_DAEMON(inoded_secs, inoded_process);
457 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
458
459 static struct attribute *tune_attrs[] = {
460         &tune_attr_ilimit.attr,
461         &tune_attr_ilimit_tries.attr,
462         &tune_attr_ilimit_min.attr,
463         &tune_attr_demote_secs.attr,
464         &tune_attr_incore_log_blocks.attr,
465         &tune_attr_log_flush_secs.attr,
466         &tune_attr_jindex_refresh_secs.attr,
467         &tune_attr_quota_warn_period.attr,
468         &tune_attr_quota_quantum.attr,
469         &tune_attr_atime_quantum.attr,
470         &tune_attr_max_readahead.attr,
471         &tune_attr_complain_secs.attr,
472         &tune_attr_reclaim_limit.attr,
473         &tune_attr_prefetch_secs.attr,
474         &tune_attr_statfs_slow.attr,
475         &tune_attr_quota_simul_sync.attr,
476         &tune_attr_quota_cache_secs.attr,
477         &tune_attr_max_atomic_write.attr,
478         &tune_attr_stall_secs.attr,
479         &tune_attr_entries_per_readdir.attr,
480         &tune_attr_greedy_default.attr,
481         &tune_attr_greedy_quantum.attr,
482         &tune_attr_greedy_max.attr,
483         &tune_attr_statfs_quantum.attr,
484         &tune_attr_scand_secs.attr,
485         &tune_attr_recoverd_secs.attr,
486         &tune_attr_logd_secs.attr,
487         &tune_attr_quotad_secs.attr,
488         &tune_attr_inoded_secs.attr,
489         &tune_attr_quota_scale.attr,
490         &tune_attr_new_files_jdata.attr,
491         &tune_attr_new_files_directio.attr,
492         NULL
493 };
494
495 static struct attribute_group lockstruct_group = {
496         .name = "lockstruct",
497         .attrs = lockstruct_attrs
498 };
499
500 static struct attribute_group counters_group = {
501         .name = "counters",
502         .attrs = counters_attrs
503 };
504
505 static struct attribute_group args_group = {
506         .name = "args",
507         .attrs = args_attrs
508 };
509
510 static struct attribute_group tune_group = {
511         .name = "tune",
512         .attrs = tune_attrs
513 };
514
515 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
516 {
517         int error;
518
519         sdp->sd_kobj.kset = &gfs2_kset;
520         sdp->sd_kobj.ktype = &gfs2_ktype;
521
522         error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
523         if (error)
524                 goto fail;
525
526         error = kobject_register(&sdp->sd_kobj);
527         if (error)
528                 goto fail;
529
530         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
531         if (error)
532                 goto fail_reg;
533
534         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
535         if (error)
536                 goto fail_lockstruct;
537
538         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
539         if (error)
540                 goto fail_counters;
541
542         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
543         if (error)
544                 goto fail_args;
545
546         return 0;
547
548  fail_args:
549         sysfs_remove_group(&sdp->sd_kobj, &args_group);
550  fail_counters:
551         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
552  fail_lockstruct:
553         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
554  fail_reg:
555         kobject_unregister(&sdp->sd_kobj);
556  fail:
557         return error;
558 }
559
560 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
561 {
562         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
563         sysfs_remove_group(&sdp->sd_kobj, &args_group);
564         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
565         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
566         kobject_unregister(&sdp->sd_kobj);
567 }
568
569 int gfs2_sys_init(void)
570 {
571         gfs2_sys_margs = NULL;
572         spin_lock_init(&gfs2_sys_margs_lock);
573         return kset_register(&gfs2_kset);
574 }
575
576 void gfs2_sys_uninit(void)
577 {
578         kfree(gfs2_sys_margs);
579         kset_unregister(&gfs2_kset);
580 }
581