[PATCH] ext2: fsid for statvfs
[linux-2.6.git] / fs / gfs2 / sys.c
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
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 snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
36 }
37
38 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
39 {
40         return snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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         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
152 static 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
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 snprintf(buf, PAGE_SIZE, 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 snprintf(buf, PAGE_SIZE, 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 snprintf(buf, PAGE_SIZE, "%d\n",
294                         !!test_bit(SDF_NOATIME, &sdp->sd_flags));
295 }
296 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
297
298 static 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
321 struct counters_attr {
322         struct attribute attr;
323         ssize_t (*show)(struct gfs2_sbd *, char *);
324 };
325
326 #define COUNTERS_ATTR(name, fmt)                                            \
327 static 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 }                                                                           \
332 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
333
334 COUNTERS_ATTR(glock_count,      "%u\n");
335 COUNTERS_ATTR(glock_held_count, "%u\n");
336 COUNTERS_ATTR(inode_count,      "%u\n");
337 COUNTERS_ATTR(reclaimed,        "%u\n");
338
339 static 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
351 static 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
358 static 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
377 static 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
397 struct 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)                                        \
404 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
405
406 #define TUNE_ATTR_2(name, store)                                              \
407 static 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 }                                                                             \
411 TUNE_ATTR_3(name, name##_show, store)
412
413 #define TUNE_ATTR(name, check_zero)                                           \
414 static 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 }                                                                             \
418 TUNE_ATTR_2(name, name##_store)
419
420 #define TUNE_ATTR_DAEMON(name, process)                                       \
421 static 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 }                                                                             \
427 TUNE_ATTR_2(name, name##_store)
428
429 TUNE_ATTR(ilimit, 0);
430 TUNE_ATTR(ilimit_tries, 0);
431 TUNE_ATTR(ilimit_min, 0);
432 TUNE_ATTR(demote_secs, 0);
433 TUNE_ATTR(incore_log_blocks, 0);
434 TUNE_ATTR(log_flush_secs, 0);
435 TUNE_ATTR(jindex_refresh_secs, 0);
436 TUNE_ATTR(quota_warn_period, 0);
437 TUNE_ATTR(quota_quantum, 0);
438 TUNE_ATTR(atime_quantum, 0);
439 TUNE_ATTR(max_readahead, 0);
440 TUNE_ATTR(complain_secs, 0);
441 TUNE_ATTR(reclaim_limit, 0);
442 TUNE_ATTR(prefetch_secs, 0);
443 TUNE_ATTR(statfs_slow, 0);
444 TUNE_ATTR(new_files_jdata, 0);
445 TUNE_ATTR(new_files_directio, 0);
446 TUNE_ATTR(quota_simul_sync, 1);
447 TUNE_ATTR(quota_cache_secs, 1);
448 TUNE_ATTR(max_atomic_write, 1);
449 TUNE_ATTR(stall_secs, 1);
450 TUNE_ATTR(entries_per_readdir, 1);
451 TUNE_ATTR(greedy_default, 1);
452 TUNE_ATTR(greedy_quantum, 1);
453 TUNE_ATTR(greedy_max, 1);
454 TUNE_ATTR(statfs_quantum, 1);
455 TUNE_ATTR_DAEMON(scand_secs, scand_process);
456 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
457 TUNE_ATTR_DAEMON(logd_secs, logd_process);
458 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
459 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
460
461 static 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
496 static struct attribute_group lockstruct_group = {
497         .name = "lockstruct",
498         .attrs = lockstruct_attrs,
499 };
500
501 static struct attribute_group counters_group = {
502         .name = "counters",
503         .attrs = counters_attrs,
504 };
505
506 static struct attribute_group args_group = {
507         .name = "args",
508         .attrs = args_attrs,
509 };
510
511 static struct attribute_group tune_group = {
512         .name = "tune",
513         .attrs = tune_attrs,
514 };
515
516 int 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
549 fail_args:
550         sysfs_remove_group(&sdp->sd_kobj, &args_group);
551 fail_counters:
552         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
553 fail_lockstruct:
554         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
555 fail_reg:
556         kobject_unregister(&sdp->sd_kobj);
557 fail:
558         fs_err(sdp, "error %d adding sysfs files", error);
559         return error;
560 }
561
562 void 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
571 int 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
578 void gfs2_sys_uninit(void)
579 {
580         kfree(gfs2_sys_margs);
581         kset_unregister(&gfs2_kset);
582 }
583