[GFS2] Allow bmap to allocate extents
[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 "sys.h"
24 #include "super.h"
25 #include "glock.h"
26 #include "quota.h"
27 #include "util.h"
28
29 char *gfs2_sys_margs;
30 spinlock_t gfs2_sys_margs_lock;
31
32 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
33 {
34         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
35                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
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
226 /*
227  * display struct lm_lockstruct fields
228  */
229
230 struct lockstruct_attr {
231         struct attribute attr;
232         ssize_t (*show)(struct gfs2_sbd *, char *);
233 };
234
235 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
236 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
237 {                                                                           \
238         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
239 }                                                                           \
240 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
241
242 LOCKSTRUCT_ATTR(jid,      "%u\n");
243 LOCKSTRUCT_ATTR(first,    "%u\n");
244 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
245 LOCKSTRUCT_ATTR(flags,    "%d\n");
246
247 static struct attribute *lockstruct_attrs[] = {
248         &lockstruct_attr_jid.attr,
249         &lockstruct_attr_first.attr,
250         &lockstruct_attr_lvb_size.attr,
251         &lockstruct_attr_flags.attr,
252         NULL,
253 };
254
255 /*
256  * display struct gfs2_args fields
257  */
258
259 struct args_attr {
260         struct attribute attr;
261         ssize_t (*show)(struct gfs2_sbd *, char *);
262 };
263
264 #define ARGS_ATTR(name, fmt)                                                \
265 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
266 {                                                                           \
267         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
268 }                                                                           \
269 static struct args_attr args_attr_##name = __ATTR_RO(name)
270
271 ARGS_ATTR(lockproto,       "%s\n");
272 ARGS_ATTR(locktable,       "%s\n");
273 ARGS_ATTR(hostdata,        "%s\n");
274 ARGS_ATTR(spectator,       "%d\n");
275 ARGS_ATTR(ignore_local_fs, "%d\n");
276 ARGS_ATTR(localcaching,    "%d\n");
277 ARGS_ATTR(localflocks,     "%d\n");
278 ARGS_ATTR(debug,           "%d\n");
279 ARGS_ATTR(upgrade,         "%d\n");
280 ARGS_ATTR(num_glockd,      "%u\n");
281 ARGS_ATTR(posix_acl,       "%d\n");
282 ARGS_ATTR(quota,           "%u\n");
283 ARGS_ATTR(suiddir,         "%d\n");
284 ARGS_ATTR(data,            "%d\n");
285
286 /* one oddball doesn't fit the macro mold */
287 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
288 {
289         return snprintf(buf, PAGE_SIZE, "%d\n",
290                         !!test_bit(SDF_NOATIME, &sdp->sd_flags));
291 }
292 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
293
294 static struct attribute *args_attrs[] = {
295         &args_attr_lockproto.attr,
296         &args_attr_locktable.attr,
297         &args_attr_hostdata.attr,
298         &args_attr_spectator.attr,
299         &args_attr_ignore_local_fs.attr,
300         &args_attr_localcaching.attr,
301         &args_attr_localflocks.attr,
302         &args_attr_debug.attr,
303         &args_attr_upgrade.attr,
304         &args_attr_num_glockd.attr,
305         &args_attr_posix_acl.attr,
306         &args_attr_quota.attr,
307         &args_attr_suiddir.attr,
308         &args_attr_data.attr,
309         &args_attr_noatime.attr,
310         NULL,
311 };
312
313 /*
314  * display counters from superblock
315  */
316
317 struct counters_attr {
318         struct attribute attr;
319         ssize_t (*show)(struct gfs2_sbd *, char *);
320 };
321
322 #define COUNTERS_ATTR(name, fmt)                                            \
323 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
324 {                                                                           \
325         return snprintf(buf, PAGE_SIZE, fmt,                                \
326                         (unsigned int)atomic_read(&sdp->sd_##name));        \
327 }                                                                           \
328 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
329
330 COUNTERS_ATTR(reclaimed,        "%u\n");
331
332 static struct attribute *counters_attrs[] = {
333         &counters_attr_reclaimed.attr,
334         NULL,
335 };
336
337 /*
338  * get and set struct gfs2_tune fields
339  */
340
341 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
342 {
343         return snprintf(buf, PAGE_SIZE, "%u %u\n",
344                         sdp->sd_tune.gt_quota_scale_num,
345                         sdp->sd_tune.gt_quota_scale_den);
346 }
347
348 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
349                                  size_t len)
350 {
351         struct gfs2_tune *gt = &sdp->sd_tune;
352         unsigned int x, y;
353
354         if (!capable(CAP_SYS_ADMIN))
355                 return -EACCES;
356
357         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
358                 return -EINVAL;
359
360         spin_lock(&gt->gt_spin);
361         gt->gt_quota_scale_num = x;
362         gt->gt_quota_scale_den = y;
363         spin_unlock(&gt->gt_spin);
364         return len;
365 }
366
367 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
368                         int check_zero, const char *buf, size_t len)
369 {
370         struct gfs2_tune *gt = &sdp->sd_tune;
371         unsigned int x;
372
373         if (!capable(CAP_SYS_ADMIN))
374                 return -EACCES;
375
376         x = simple_strtoul(buf, NULL, 0);
377
378         if (check_zero && !x)
379                 return -EINVAL;
380
381         spin_lock(&gt->gt_spin);
382         *field = x;
383         spin_unlock(&gt->gt_spin);
384         return len;
385 }
386
387 struct tune_attr {
388         struct attribute attr;
389         ssize_t (*show)(struct gfs2_sbd *, char *);
390         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
391 };
392
393 #define TUNE_ATTR_3(name, show, store)                                        \
394 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
395
396 #define TUNE_ATTR_2(name, store)                                              \
397 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
398 {                                                                             \
399         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
400 }                                                                             \
401 TUNE_ATTR_3(name, name##_show, store)
402
403 #define TUNE_ATTR(name, check_zero)                                           \
404 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
405 {                                                                             \
406         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
407 }                                                                             \
408 TUNE_ATTR_2(name, name##_store)
409
410 #define TUNE_ATTR_DAEMON(name, process)                                       \
411 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
412 {                                                                             \
413         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
414         wake_up_process(sdp->sd_##process);                                   \
415         return r;                                                             \
416 }                                                                             \
417 TUNE_ATTR_2(name, name##_store)
418
419 TUNE_ATTR(demote_secs, 0);
420 TUNE_ATTR(incore_log_blocks, 0);
421 TUNE_ATTR(log_flush_secs, 0);
422 TUNE_ATTR(quota_warn_period, 0);
423 TUNE_ATTR(quota_quantum, 0);
424 TUNE_ATTR(atime_quantum, 0);
425 TUNE_ATTR(max_readahead, 0);
426 TUNE_ATTR(complain_secs, 0);
427 TUNE_ATTR(statfs_slow, 0);
428 TUNE_ATTR(new_files_jdata, 0);
429 TUNE_ATTR(new_files_directio, 0);
430 TUNE_ATTR(quota_simul_sync, 1);
431 TUNE_ATTR(quota_cache_secs, 1);
432 TUNE_ATTR(stall_secs, 1);
433 TUNE_ATTR(statfs_quantum, 1);
434 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
435 TUNE_ATTR_DAEMON(logd_secs, logd_process);
436 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
437 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
438
439 static struct attribute *tune_attrs[] = {
440         &tune_attr_demote_secs.attr,
441         &tune_attr_incore_log_blocks.attr,
442         &tune_attr_log_flush_secs.attr,
443         &tune_attr_quota_warn_period.attr,
444         &tune_attr_quota_quantum.attr,
445         &tune_attr_atime_quantum.attr,
446         &tune_attr_max_readahead.attr,
447         &tune_attr_complain_secs.attr,
448         &tune_attr_statfs_slow.attr,
449         &tune_attr_quota_simul_sync.attr,
450         &tune_attr_quota_cache_secs.attr,
451         &tune_attr_stall_secs.attr,
452         &tune_attr_statfs_quantum.attr,
453         &tune_attr_recoverd_secs.attr,
454         &tune_attr_logd_secs.attr,
455         &tune_attr_quotad_secs.attr,
456         &tune_attr_quota_scale.attr,
457         &tune_attr_new_files_jdata.attr,
458         &tune_attr_new_files_directio.attr,
459         NULL,
460 };
461
462 static struct attribute_group lockstruct_group = {
463         .name = "lockstruct",
464         .attrs = lockstruct_attrs,
465 };
466
467 static struct attribute_group counters_group = {
468         .name = "counters",
469         .attrs = counters_attrs,
470 };
471
472 static struct attribute_group args_group = {
473         .name = "args",
474         .attrs = args_attrs,
475 };
476
477 static struct attribute_group tune_group = {
478         .name = "tune",
479         .attrs = tune_attrs,
480 };
481
482 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
483 {
484         int error;
485
486         sdp->sd_kobj.kset = gfs2_kset;
487         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
488                                      "%s", sdp->sd_table_name);
489         if (error)
490                 goto fail;
491
492         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
493         if (error)
494                 goto fail_reg;
495
496         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
497         if (error)
498                 goto fail_lockstruct;
499
500         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
501         if (error)
502                 goto fail_counters;
503
504         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
505         if (error)
506                 goto fail_args;
507
508         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
509         return 0;
510
511 fail_args:
512         sysfs_remove_group(&sdp->sd_kobj, &args_group);
513 fail_counters:
514         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
515 fail_lockstruct:
516         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
517 fail_reg:
518         kobject_put(&sdp->sd_kobj);
519 fail:
520         fs_err(sdp, "error %d adding sysfs files", error);
521         return error;
522 }
523
524 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
525 {
526         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
527         sysfs_remove_group(&sdp->sd_kobj, &args_group);
528         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
529         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
530         kobject_put(&sdp->sd_kobj);
531 }
532
533 int gfs2_sys_init(void)
534 {
535         gfs2_sys_margs = NULL;
536         spin_lock_init(&gfs2_sys_margs_lock);
537         gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
538         if (!gfs2_kset)
539                 return -ENOMEM;
540         return 0;
541 }
542
543 void gfs2_sys_uninit(void)
544 {
545         kfree(gfs2_sys_margs);
546         kset_unregister(gfs2_kset);
547 }
548