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x86: Add reboot quirk for every 5 series MacBook/Pro
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / super.c
blobf522bb017973350932638ff55fd18d93af65014a
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 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/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "log.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "recovery.h"
36 #include "rgrp.h"
37 #include "super.h"
38 #include "trans.h"
39 #include "util.h"
40 #include "sys.h"
41 #include "eattr.h"
42
43 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
44
45 enum {
46 Opt_lockproto,
47 Opt_locktable,
48 Opt_hostdata,
49 Opt_spectator,
50 Opt_ignore_local_fs,
51 Opt_localflocks,
52 Opt_localcaching,
53 Opt_debug,
54 Opt_nodebug,
55 Opt_upgrade,
56 Opt_acl,
57 Opt_noacl,
58 Opt_quota_off,
59 Opt_quota_account,
60 Opt_quota_on,
61 Opt_quota,
62 Opt_noquota,
63 Opt_suiddir,
64 Opt_nosuiddir,
65 Opt_data_writeback,
66 Opt_data_ordered,
67 Opt_meta,
68 Opt_discard,
69 Opt_nodiscard,
70 Opt_commit,
71 Opt_error,
72 };
73
74 static const match_table_t tokens = {
75 {Opt_lockproto, "lockproto=%s"},
76 {Opt_locktable, "locktable=%s"},
77 {Opt_hostdata, "hostdata=%s"},
78 {Opt_spectator, "spectator"},
79 {Opt_ignore_local_fs, "ignore_local_fs"},
80 {Opt_localflocks, "localflocks"},
81 {Opt_localcaching, "localcaching"},
82 {Opt_debug, "debug"},
83 {Opt_nodebug, "nodebug"},
84 {Opt_upgrade, "upgrade"},
85 {Opt_acl, "acl"},
86 {Opt_noacl, "noacl"},
87 {Opt_quota_off, "quota=off"},
88 {Opt_quota_account, "quota=account"},
89 {Opt_quota_on, "quota=on"},
90 {Opt_quota, "quota"},
91 {Opt_noquota, "noquota"},
92 {Opt_suiddir, "suiddir"},
93 {Opt_nosuiddir, "nosuiddir"},
94 {Opt_data_writeback, "data=writeback"},
95 {Opt_data_ordered, "data=ordered"},
96 {Opt_meta, "meta"},
97 {Opt_discard, "discard"},
98 {Opt_nodiscard, "nodiscard"},
99 {Opt_commit, "commit=%d"},
100 {Opt_error, NULL}
101 };
102
103 /**
104 * gfs2_mount_args - Parse mount options
105 * @sdp:
106 * @data:
107 *
108 * Return: errno
109 */
110
111 int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
112 {
113 char *o;
114 int token;
115 substring_t tmp[MAX_OPT_ARGS];
116 int rv;
117
118 /* Split the options into tokens with the "," character and
119 process them */
120
121 while (1) {
122 o = strsep(&options, ",");
123 if (o == NULL)
124 break;
125 if (*o == '\0')
126 continue;
127
128 token = match_token(o, tokens, tmp);
129 switch (token) {
130 case Opt_lockproto:
131 match_strlcpy(args->ar_lockproto, &tmp[0],
132 GFS2_LOCKNAME_LEN);
133 break;
134 case Opt_locktable:
135 match_strlcpy(args->ar_locktable, &tmp[0],
136 GFS2_LOCKNAME_LEN);
137 break;
138 case Opt_hostdata:
139 match_strlcpy(args->ar_hostdata, &tmp[0],
140 GFS2_LOCKNAME_LEN);
141 break;
142 case Opt_spectator:
143 args->ar_spectator = 1;
144 break;
145 case Opt_ignore_local_fs:
146 args->ar_ignore_local_fs = 1;
147 break;
148 case Opt_localflocks:
149 args->ar_localflocks = 1;
150 break;
151 case Opt_localcaching:
152 args->ar_localcaching = 1;
153 break;
154 case Opt_debug:
155 args->ar_debug = 1;
156 break;
157 case Opt_nodebug:
158 args->ar_debug = 0;
159 break;
160 case Opt_upgrade:
161 args->ar_upgrade = 1;
162 break;
163 case Opt_acl:
164 args->ar_posix_acl = 1;
165 break;
166 case Opt_noacl:
167 args->ar_posix_acl = 0;
168 break;
169 case Opt_quota_off:
170 case Opt_noquota:
171 args->ar_quota = GFS2_QUOTA_OFF;
172 break;
173 case Opt_quota_account:
174 args->ar_quota = GFS2_QUOTA_ACCOUNT;
175 break;
176 case Opt_quota_on:
177 case Opt_quota:
178 args->ar_quota = GFS2_QUOTA_ON;
179 break;
180 case Opt_suiddir:
181 args->ar_suiddir = 1;
182 break;
183 case Opt_nosuiddir:
184 args->ar_suiddir = 0;
185 break;
186 case Opt_data_writeback:
187 args->ar_data = GFS2_DATA_WRITEBACK;
188 break;
189 case Opt_data_ordered:
190 args->ar_data = GFS2_DATA_ORDERED;
191 break;
192 case Opt_meta:
193 args->ar_meta = 1;
194 break;
195 case Opt_discard:
196 args->ar_discard = 1;
197 break;
198 case Opt_nodiscard:
199 args->ar_discard = 0;
200 break;
201 case Opt_commit:
202 rv = match_int(&tmp[0], &args->ar_commit);
203 if (rv || args->ar_commit <= 0) {
204 fs_info(sdp, "commit mount option requires a positive numeric argument\n");
205 return rv ? rv : -EINVAL;
206 }
207 break;
208 case Opt_error:
209 default:
210 fs_info(sdp, "invalid mount option: %s\n", o);
211 return -EINVAL;
212 }
213 }
214
215 return 0;
216 }
217
218 /**
219 * gfs2_jindex_free - Clear all the journal index information
220 * @sdp: The GFS2 superblock
221 *
222 */
223
224 void gfs2_jindex_free(struct gfs2_sbd *sdp)
225 {
226 struct list_head list, *head;
227 struct gfs2_jdesc *jd;
228 struct gfs2_journal_extent *jext;
229
230 spin_lock(&sdp->sd_jindex_spin);
231 list_add(&list, &sdp->sd_jindex_list);
232 list_del_init(&sdp->sd_jindex_list);
233 sdp->sd_journals = 0;
234 spin_unlock(&sdp->sd_jindex_spin);
235
236 while (!list_empty(&list)) {
237 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
238 head = &jd->extent_list;
239 while (!list_empty(head)) {
240 jext = list_entry(head->next,
241 struct gfs2_journal_extent,
242 extent_list);
243 list_del(&jext->extent_list);
244 kfree(jext);
245 }
246 list_del(&jd->jd_list);
247 iput(jd->jd_inode);
248 kfree(jd);
249 }
250 }
251
252 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
253 {
254 struct gfs2_jdesc *jd;
255 int found = 0;
256
257 list_for_each_entry(jd, head, jd_list) {
258 if (jd->jd_jid == jid) {
259 found = 1;
260 break;
261 }
262 }
263
264 if (!found)
265 jd = NULL;
266
267 return jd;
268 }
269
270 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
271 {
272 struct gfs2_jdesc *jd;
273
274 spin_lock(&sdp->sd_jindex_spin);
275 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
276 spin_unlock(&sdp->sd_jindex_spin);
277
278 return jd;
279 }
280
281 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
282 {
283 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
284 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
285 int ar;
286 int error;
287
288 if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
289 (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
290 gfs2_consist_inode(ip);
291 return -EIO;
292 }
293 jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
294
295 error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
296 if (!error && ar) {
297 gfs2_consist_inode(ip);
298 error = -EIO;
299 }
300
301 return error;
302 }
303
304 /**
305 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
306 * @sdp: the filesystem
307 *
308 * Returns: errno
309 */
310
311 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
312 {
313 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
314 struct gfs2_glock *j_gl = ip->i_gl;
315 struct gfs2_holder t_gh;
316 struct gfs2_log_header_host head;
317 int error;
318
319 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
320 if (error)
321 return error;
322
323 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
324
325 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
326 if (error)
327 goto fail;
328
329 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
330 gfs2_consist(sdp);
331 error = -EIO;
332 goto fail;
333 }
334
335 /* Initialize some head of the log stuff */
336 sdp->sd_log_sequence = head.lh_sequence + 1;
337 gfs2_log_pointers_init(sdp, head.lh_blkno);
338
339 error = gfs2_quota_init(sdp);
340 if (error)
341 goto fail;
342
343 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
344
345 gfs2_glock_dq_uninit(&t_gh);
346
347 return 0;
348
349 fail:
350 t_gh.gh_flags |= GL_NOCACHE;
351 gfs2_glock_dq_uninit(&t_gh);
352
353 return error;
354 }
355
356 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
357 {
358 const struct gfs2_statfs_change *str = buf;
359
360 sc->sc_total = be64_to_cpu(str->sc_total);
361 sc->sc_free = be64_to_cpu(str->sc_free);
362 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
363 }
364
365 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
366 {
367 struct gfs2_statfs_change *str = buf;
368
369 str->sc_total = cpu_to_be64(sc->sc_total);
370 str->sc_free = cpu_to_be64(sc->sc_free);
371 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
372 }
373
374 int gfs2_statfs_init(struct gfs2_sbd *sdp)
375 {
376 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
377 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
378 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
379 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
380 struct buffer_head *m_bh, *l_bh;
381 struct gfs2_holder gh;
382 int error;
383
384 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
385 &gh);
386 if (error)
387 return error;
388
389 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
390 if (error)
391 goto out;
392
393 if (sdp->sd_args.ar_spectator) {
394 spin_lock(&sdp->sd_statfs_spin);
395 gfs2_statfs_change_in(m_sc, m_bh->b_data +
396 sizeof(struct gfs2_dinode));
397 spin_unlock(&sdp->sd_statfs_spin);
398 } else {
399 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
400 if (error)
401 goto out_m_bh;
402
403 spin_lock(&sdp->sd_statfs_spin);
404 gfs2_statfs_change_in(m_sc, m_bh->b_data +
405 sizeof(struct gfs2_dinode));
406 gfs2_statfs_change_in(l_sc, l_bh->b_data +
407 sizeof(struct gfs2_dinode));
408 spin_unlock(&sdp->sd_statfs_spin);
409
410 brelse(l_bh);
411 }
412
413 out_m_bh:
414 brelse(m_bh);
415 out:
416 gfs2_glock_dq_uninit(&gh);
417 return 0;
418 }
419
420 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
421 s64 dinodes)
422 {
423 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
424 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
425 struct buffer_head *l_bh;
426 int error;
427
428 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
429 if (error)
430 return;
431
432 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
433
434 spin_lock(&sdp->sd_statfs_spin);
435 l_sc->sc_total += total;
436 l_sc->sc_free += free;
437 l_sc->sc_dinodes += dinodes;
438 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
439 spin_unlock(&sdp->sd_statfs_spin);
440
441 brelse(l_bh);
442 }
443
444 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
445 struct buffer_head *l_bh)
446 {
447 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
448 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
449 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
450 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
451
452 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
453
454 spin_lock(&sdp->sd_statfs_spin);
455 m_sc->sc_total += l_sc->sc_total;
456 m_sc->sc_free += l_sc->sc_free;
457 m_sc->sc_dinodes += l_sc->sc_dinodes;
458 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
459 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
460 0, sizeof(struct gfs2_statfs_change));
461 spin_unlock(&sdp->sd_statfs_spin);
462
463 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
464 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
465 }
466
467 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
468 {
469 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
470 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
471 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
472 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
473 struct gfs2_holder gh;
474 struct buffer_head *m_bh, *l_bh;
475 int error;
476
477 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
478 &gh);
479 if (error)
480 return error;
481
482 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
483 if (error)
484 goto out;
485
486 spin_lock(&sdp->sd_statfs_spin);
487 gfs2_statfs_change_in(m_sc, m_bh->b_data +
488 sizeof(struct gfs2_dinode));
489 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
490 spin_unlock(&sdp->sd_statfs_spin);
491 goto out_bh;
492 }
493 spin_unlock(&sdp->sd_statfs_spin);
494
495 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
496 if (error)
497 goto out_bh;
498
499 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
500 if (error)
501 goto out_bh2;
502
503 update_statfs(sdp, m_bh, l_bh);
504
505 gfs2_trans_end(sdp);
506
507 out_bh2:
508 brelse(l_bh);
509 out_bh:
510 brelse(m_bh);
511 out:
512 gfs2_glock_dq_uninit(&gh);
513 return error;
514 }
515
516 struct lfcc {
517 struct list_head list;
518 struct gfs2_holder gh;
519 };
520
521 /**
522 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
523 * journals are clean
524 * @sdp: the file system
525 * @state: the state to put the transaction lock into
526 * @t_gh: the hold on the transaction lock
527 *
528 * Returns: errno
529 */
530
531 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
532 struct gfs2_holder *t_gh)
533 {
534 struct gfs2_inode *ip;
535 struct gfs2_jdesc *jd;
536 struct lfcc *lfcc;
537 LIST_HEAD(list);
538 struct gfs2_log_header_host lh;
539 int error;
540
541 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
542 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
543 if (!lfcc) {
544 error = -ENOMEM;
545 goto out;
546 }
547 ip = GFS2_I(jd->jd_inode);
548 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
549 if (error) {
550 kfree(lfcc);
551 goto out;
552 }
553 list_add(&lfcc->list, &list);
554 }
555
556 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
557 GL_NOCACHE, t_gh);
558
559 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
560 error = gfs2_jdesc_check(jd);
561 if (error)
562 break;
563 error = gfs2_find_jhead(jd, &lh);
564 if (error)
565 break;
566 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
567 error = -EBUSY;
568 break;
569 }
570 }
571
572 if (error)
573 gfs2_glock_dq_uninit(t_gh);
574
575 out:
576 while (!list_empty(&list)) {
577 lfcc = list_entry(list.next, struct lfcc, list);
578 list_del(&lfcc->list);
579 gfs2_glock_dq_uninit(&lfcc->gh);
580 kfree(lfcc);
581 }
582 return error;
583 }
584
585 /**
586 * gfs2_freeze_fs - freezes the file system
587 * @sdp: the file system
588 *
589 * This function flushes data and meta data for all machines by
590 * aquiring the transaction log exclusively. All journals are
591 * ensured to be in a clean state as well.
592 *
593 * Returns: errno
594 */
595
596 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
597 {
598 int error = 0;
599
600 mutex_lock(&sdp->sd_freeze_lock);
601
602 if (!sdp->sd_freeze_count++) {
603 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
604 if (error)
605 sdp->sd_freeze_count--;
606 }
607
608 mutex_unlock(&sdp->sd_freeze_lock);
609
610 return error;
611 }
612
613 /**
614 * gfs2_unfreeze_fs - unfreezes the file system
615 * @sdp: the file system
616 *
617 * This function allows the file system to proceed by unlocking
618 * the exclusively held transaction lock. Other GFS2 nodes are
619 * now free to acquire the lock shared and go on with their lives.
620 *
621 */
622
623 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
624 {
625 mutex_lock(&sdp->sd_freeze_lock);
626
627 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
628 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
629
630 mutex_unlock(&sdp->sd_freeze_lock);
631 }
632
633
634 /**
635 * gfs2_write_inode - Make sure the inode is stable on the disk
636 * @inode: The inode
637 * @sync: synchronous write flag
638 *
639 * Returns: errno
640 */
641
642 static int gfs2_write_inode(struct inode *inode, int sync)
643 {
644 struct gfs2_inode *ip = GFS2_I(inode);
645 struct gfs2_sbd *sdp = GFS2_SB(inode);
646 struct gfs2_holder gh;
647 struct buffer_head *bh;
648 struct timespec atime;
649 struct gfs2_dinode *di;
650 int ret = 0;
651
652 /* Check this is a "normal" inode, etc */
653 if (!test_bit(GIF_USER, &ip->i_flags) ||
654 (current->flags & PF_MEMALLOC))
655 return 0;
656 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
657 if (ret)
658 goto do_flush;
659 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
660 if (ret)
661 goto do_unlock;
662 ret = gfs2_meta_inode_buffer(ip, &bh);
663 if (ret == 0) {
664 di = (struct gfs2_dinode *)bh->b_data;
665 atime.tv_sec = be64_to_cpu(di->di_atime);
666 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
667 if (timespec_compare(&inode->i_atime, &atime) > 0) {
668 gfs2_trans_add_bh(ip->i_gl, bh, 1);
669 gfs2_dinode_out(ip, bh->b_data);
670 }
671 brelse(bh);
672 }
673 gfs2_trans_end(sdp);
674 do_unlock:
675 gfs2_glock_dq_uninit(&gh);
676 do_flush:
677 if (sync != 0)
678 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
679 return ret;
680 }
681
682 /**
683 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
684 * @sdp: the filesystem
685 *
686 * Returns: errno
687 */
688
689 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
690 {
691 struct gfs2_holder t_gh;
692 int error;
693
694 flush_workqueue(gfs2_delete_workqueue);
695 gfs2_quota_sync(sdp);
696 gfs2_statfs_sync(sdp);
697
698 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
699 &t_gh);
700 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
701 return error;
702
703 gfs2_meta_syncfs(sdp);
704 gfs2_log_shutdown(sdp);
705
706 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
707
708 if (t_gh.gh_gl)
709 gfs2_glock_dq_uninit(&t_gh);
710
711 gfs2_quota_cleanup(sdp);
712
713 return error;
714 }
715
716 static int gfs2_umount_recovery_wait(void *word)
717 {
718 schedule();
719 return 0;
720 }
721
722 /**
723 * gfs2_put_super - Unmount the filesystem
724 * @sb: The VFS superblock
725 *
726 */
727
728 static void gfs2_put_super(struct super_block *sb)
729 {
730 struct gfs2_sbd *sdp = sb->s_fs_info;
731 int error;
732 struct gfs2_jdesc *jd;
733
734 /* Unfreeze the filesystem, if we need to */
735
736 mutex_lock(&sdp->sd_freeze_lock);
737 if (sdp->sd_freeze_count)
738 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
739 mutex_unlock(&sdp->sd_freeze_lock);
740
741 /* No more recovery requests */
742 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
743 smp_mb();
744
745 /* Wait on outstanding recovery */
746 restart:
747 spin_lock(&sdp->sd_jindex_spin);
748 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
749 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
750 continue;
751 spin_unlock(&sdp->sd_jindex_spin);
752 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
753 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
754 goto restart;
755 }
756 spin_unlock(&sdp->sd_jindex_spin);
757
758 kthread_stop(sdp->sd_quotad_process);
759 kthread_stop(sdp->sd_logd_process);
760
761 if (!(sb->s_flags & MS_RDONLY)) {
762 error = gfs2_make_fs_ro(sdp);
763 if (error)
764 gfs2_io_error(sdp);
765 }
766 /* At this point, we're through modifying the disk */
767
768 /* Release stuff */
769
770 iput(sdp->sd_jindex);
771 iput(sdp->sd_inum_inode);
772 iput(sdp->sd_statfs_inode);
773 iput(sdp->sd_rindex);
774 iput(sdp->sd_quota_inode);
775
776 gfs2_glock_put(sdp->sd_rename_gl);
777 gfs2_glock_put(sdp->sd_trans_gl);
778
779 if (!sdp->sd_args.ar_spectator) {
780 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
781 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
782 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
783 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
784 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
785 iput(sdp->sd_ir_inode);
786 iput(sdp->sd_sc_inode);
787 iput(sdp->sd_qc_inode);
788 }
789
790 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
791 gfs2_clear_rgrpd(sdp);
792 gfs2_jindex_free(sdp);
793 /* Take apart glock structures and buffer lists */
794 gfs2_gl_hash_clear(sdp);
795 /* Unmount the locking protocol */
796 gfs2_lm_unmount(sdp);
797
798 /* At this point, we're through participating in the lockspace */
799 gfs2_sys_fs_del(sdp);
800 }
801
802 /**
803 * gfs2_sync_fs - sync the filesystem
804 * @sb: the superblock
805 *
806 * Flushes the log to disk.
807 */
808
809 static int gfs2_sync_fs(struct super_block *sb, int wait)
810 {
811 if (wait && sb->s_fs_info)
812 gfs2_log_flush(sb->s_fs_info, NULL);
813 return 0;
814 }
815
816 /**
817 * gfs2_freeze - prevent further writes to the filesystem
818 * @sb: the VFS structure for the filesystem
819 *
820 */
821
822 static int gfs2_freeze(struct super_block *sb)
823 {
824 struct gfs2_sbd *sdp = sb->s_fs_info;
825 int error;
826
827 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
828 return -EINVAL;
829
830 for (;;) {
831 error = gfs2_freeze_fs(sdp);
832 if (!error)
833 break;
834
835 switch (error) {
836 case -EBUSY:
837 fs_err(sdp, "waiting for recovery before freeze\n");
838 break;
839
840 default:
841 fs_err(sdp, "error freezing FS: %d\n", error);
842 break;
843 }
844
845 fs_err(sdp, "retrying...\n");
846 msleep(1000);
847 }
848 return 0;
849 }
850
851 /**
852 * gfs2_unfreeze - reallow writes to the filesystem
853 * @sb: the VFS structure for the filesystem
854 *
855 */
856
857 static int gfs2_unfreeze(struct super_block *sb)
858 {
859 gfs2_unfreeze_fs(sb->s_fs_info);
860 return 0;
861 }
862
863 /**
864 * statfs_fill - fill in the sg for a given RG
865 * @rgd: the RG
866 * @sc: the sc structure
867 *
868 * Returns: 0 on success, -ESTALE if the LVB is invalid
869 */
870
871 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
872 struct gfs2_statfs_change_host *sc)
873 {
874 gfs2_rgrp_verify(rgd);
875 sc->sc_total += rgd->rd_data;
876 sc->sc_free += rgd->rd_free;
877 sc->sc_dinodes += rgd->rd_dinodes;
878 return 0;
879 }
880
881 /**
882 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
883 * @sdp: the filesystem
884 * @sc: the sc info that will be returned
885 *
886 * Any error (other than a signal) will cause this routine to fall back
887 * to the synchronous version.
888 *
889 * FIXME: This really shouldn't busy wait like this.
890 *
891 * Returns: errno
892 */
893
894 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
895 {
896 struct gfs2_holder ri_gh;
897 struct gfs2_rgrpd *rgd_next;
898 struct gfs2_holder *gha, *gh;
899 unsigned int slots = 64;
900 unsigned int x;
901 int done;
902 int error = 0, err;
903
904 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
905 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
906 if (!gha)
907 return -ENOMEM;
908
909 error = gfs2_rindex_hold(sdp, &ri_gh);
910 if (error)
911 goto out;
912
913 rgd_next = gfs2_rgrpd_get_first(sdp);
914
915 for (;;) {
916 done = 1;
917
918 for (x = 0; x < slots; x++) {
919 gh = gha + x;
920
921 if (gh->gh_gl && gfs2_glock_poll(gh)) {
922 err = gfs2_glock_wait(gh);
923 if (err) {
924 gfs2_holder_uninit(gh);
925 error = err;
926 } else {
927 if (!error)
928 error = statfs_slow_fill(
929 gh->gh_gl->gl_object, sc);
930 gfs2_glock_dq_uninit(gh);
931 }
932 }
933
934 if (gh->gh_gl)
935 done = 0;
936 else if (rgd_next && !error) {
937 error = gfs2_glock_nq_init(rgd_next->rd_gl,
938 LM_ST_SHARED,
939 GL_ASYNC,
940 gh);
941 rgd_next = gfs2_rgrpd_get_next(rgd_next);
942 done = 0;
943 }
944
945 if (signal_pending(current))
946 error = -ERESTARTSYS;
947 }
948
949 if (done)
950 break;
951
952 yield();
953 }
954
955 gfs2_glock_dq_uninit(&ri_gh);
956
957 out:
958 kfree(gha);
959 return error;
960 }
961
962 /**
963 * gfs2_statfs_i - Do a statfs
964 * @sdp: the filesystem
965 * @sg: the sg structure
966 *
967 * Returns: errno
968 */
969
970 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
971 {
972 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
973 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
974
975 spin_lock(&sdp->sd_statfs_spin);
976
977 *sc = *m_sc;
978 sc->sc_total += l_sc->sc_total;
979 sc->sc_free += l_sc->sc_free;
980 sc->sc_dinodes += l_sc->sc_dinodes;
981
982 spin_unlock(&sdp->sd_statfs_spin);
983
984 if (sc->sc_free < 0)
985 sc->sc_free = 0;
986 if (sc->sc_free > sc->sc_total)
987 sc->sc_free = sc->sc_total;
988 if (sc->sc_dinodes < 0)
989 sc->sc_dinodes = 0;
990
991 return 0;
992 }
993
994 /**
995 * gfs2_statfs - Gather and return stats about the filesystem
996 * @sb: The superblock
997 * @statfsbuf: The buffer
998 *
999 * Returns: 0 on success or error code
1000 */
1001
1002 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1003 {
1004 struct super_block *sb = dentry->d_inode->i_sb;
1005 struct gfs2_sbd *sdp = sb->s_fs_info;
1006 struct gfs2_statfs_change_host sc;
1007 int error;
1008
1009 if (gfs2_tune_get(sdp, gt_statfs_slow))
1010 error = gfs2_statfs_slow(sdp, &sc);
1011 else
1012 error = gfs2_statfs_i(sdp, &sc);
1013
1014 if (error)
1015 return error;
1016
1017 buf->f_type = GFS2_MAGIC;
1018 buf->f_bsize = sdp->sd_sb.sb_bsize;
1019 buf->f_blocks = sc.sc_total;
1020 buf->f_bfree = sc.sc_free;
1021 buf->f_bavail = sc.sc_free;
1022 buf->f_files = sc.sc_dinodes + sc.sc_free;
1023 buf->f_ffree = sc.sc_free;
1024 buf->f_namelen = GFS2_FNAMESIZE;
1025
1026 return 0;
1027 }
1028
1029 /**
1030 * gfs2_remount_fs - called when the FS is remounted
1031 * @sb: the filesystem
1032 * @flags: the remount flags
1033 * @data: extra data passed in (not used right now)
1034 *
1035 * Returns: errno
1036 */
1037
1038 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1039 {
1040 struct gfs2_sbd *sdp = sb->s_fs_info;
1041 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1042 struct gfs2_tune *gt = &sdp->sd_tune;
1043 int error;
1044
1045 spin_lock(&gt->gt_spin);
1046 args.ar_commit = gt->gt_log_flush_secs;
1047 spin_unlock(&gt->gt_spin);
1048 error = gfs2_mount_args(sdp, &args, data);
1049 if (error)
1050 return error;
1051
1052 /* Not allowed to change locking details */
1053 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1054 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1055 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1056 return -EINVAL;
1057
1058 /* Some flags must not be changed */
1059 if (args_neq(&args, &sdp->sd_args, spectator) ||
1060 args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1061 args_neq(&args, &sdp->sd_args, localflocks) ||
1062 args_neq(&args, &sdp->sd_args, localcaching) ||
1063 args_neq(&args, &sdp->sd_args, meta))
1064 return -EINVAL;
1065
1066 if (sdp->sd_args.ar_spectator)
1067 *flags |= MS_RDONLY;
1068
1069 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1070 if (*flags & MS_RDONLY)
1071 error = gfs2_make_fs_ro(sdp);
1072 else
1073 error = gfs2_make_fs_rw(sdp);
1074 if (error)
1075 return error;
1076 }
1077
1078 sdp->sd_args = args;
1079 if (sdp->sd_args.ar_posix_acl)
1080 sb->s_flags |= MS_POSIXACL;
1081 else
1082 sb->s_flags &= ~MS_POSIXACL;
1083 spin_lock(&gt->gt_spin);
1084 gt->gt_log_flush_secs = args.ar_commit;
1085 spin_unlock(&gt->gt_spin);
1086
1087 return 0;
1088 }
1089
1090 /**
1091 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1092 * @inode: The inode to drop
1093 *
1094 * If we've received a callback on an iopen lock then its because a
1095 * remote node tried to deallocate the inode but failed due to this node
1096 * still having the inode open. Here we mark the link count zero
1097 * since we know that it must have reached zero if the GLF_DEMOTE flag
1098 * is set on the iopen glock. If we didn't do a disk read since the
1099 * remote node removed the final link then we might otherwise miss
1100 * this event. This check ensures that this node will deallocate the
1101 * inode's blocks, or alternatively pass the baton on to another
1102 * node for later deallocation.
1103 */
1104
1105 static void gfs2_drop_inode(struct inode *inode)
1106 {
1107 struct gfs2_inode *ip = GFS2_I(inode);
1108
1109 if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1110 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1111 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1112 clear_nlink(inode);
1113 }
1114 generic_drop_inode(inode);
1115 }
1116
1117 /**
1118 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1119 * @inode: The VFS inode
1120 *
1121 */
1122
1123 static void gfs2_clear_inode(struct inode *inode)
1124 {
1125 struct gfs2_inode *ip = GFS2_I(inode);
1126
1127 /* This tells us its a "real" inode and not one which only
1128 * serves to contain an address space (see rgrp.c, meta_io.c)
1129 * which therefore doesn't have its own glocks.
1130 */
1131 if (test_bit(GIF_USER, &ip->i_flags)) {
1132 ip->i_gl->gl_object = NULL;
1133 gfs2_glock_put(ip->i_gl);
1134 ip->i_gl = NULL;
1135 if (ip->i_iopen_gh.gh_gl) {
1136 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1137 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1138 }
1139 }
1140 }
1141
1142 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1143 {
1144 do {
1145 if (d1 == d2)
1146 return 1;
1147 d1 = d1->d_parent;
1148 } while (!IS_ROOT(d1));
1149 return 0;
1150 }
1151
1152 /**
1153 * gfs2_show_options - Show mount options for /proc/mounts
1154 * @s: seq_file structure
1155 * @mnt: vfsmount
1156 *
1157 * Returns: 0 on success or error code
1158 */
1159
1160 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1161 {
1162 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1163 struct gfs2_args *args = &sdp->sd_args;
1164 int lfsecs;
1165
1166 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1167 seq_printf(s, ",meta");
1168 if (args->ar_lockproto[0])
1169 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1170 if (args->ar_locktable[0])
1171 seq_printf(s, ",locktable=%s", args->ar_locktable);
1172 if (args->ar_hostdata[0])
1173 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1174 if (args->ar_spectator)
1175 seq_printf(s, ",spectator");
1176 if (args->ar_ignore_local_fs)
1177 seq_printf(s, ",ignore_local_fs");
1178 if (args->ar_localflocks)
1179 seq_printf(s, ",localflocks");
1180 if (args->ar_localcaching)
1181 seq_printf(s, ",localcaching");
1182 if (args->ar_debug)
1183 seq_printf(s, ",debug");
1184 if (args->ar_upgrade)
1185 seq_printf(s, ",upgrade");
1186 if (args->ar_posix_acl)
1187 seq_printf(s, ",acl");
1188 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1189 char *state;
1190 switch (args->ar_quota) {
1191 case GFS2_QUOTA_OFF:
1192 state = "off";
1193 break;
1194 case GFS2_QUOTA_ACCOUNT:
1195 state = "account";
1196 break;
1197 case GFS2_QUOTA_ON:
1198 state = "on";
1199 break;
1200 default:
1201 state = "unknown";
1202 break;
1203 }
1204 seq_printf(s, ",quota=%s", state);
1205 }
1206 if (args->ar_suiddir)
1207 seq_printf(s, ",suiddir");
1208 if (args->ar_data != GFS2_DATA_DEFAULT) {
1209 char *state;
1210 switch (args->ar_data) {
1211 case GFS2_DATA_WRITEBACK:
1212 state = "writeback";
1213 break;
1214 case GFS2_DATA_ORDERED:
1215 state = "ordered";
1216 break;
1217 default:
1218 state = "unknown";
1219 break;
1220 }
1221 seq_printf(s, ",data=%s", state);
1222 }
1223 if (args->ar_discard)
1224 seq_printf(s, ",discard");
1225 lfsecs = sdp->sd_tune.gt_log_flush_secs;
1226 if (lfsecs != 60)
1227 seq_printf(s, ",commit=%d", lfsecs);
1228 return 0;
1229 }
1230
1231 /*
1232 * We have to (at the moment) hold the inodes main lock to cover
1233 * the gap between unlocking the shared lock on the iopen lock and
1234 * taking the exclusive lock. I'd rather do a shared -> exclusive
1235 * conversion on the iopen lock, but we can change that later. This
1236 * is safe, just less efficient.
1237 */
1238
1239 static void gfs2_delete_inode(struct inode *inode)
1240 {
1241 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1242 struct gfs2_inode *ip = GFS2_I(inode);
1243 struct gfs2_holder gh;
1244 int error;
1245
1246 if (!test_bit(GIF_USER, &ip->i_flags))
1247 goto out;
1248
1249 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1250 if (unlikely(error)) {
1251 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1252 goto out;
1253 }
1254
1255 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1256 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1257 error = gfs2_glock_nq(&ip->i_iopen_gh);
1258 if (error)
1259 goto out_truncate;
1260
1261 if (S_ISDIR(inode->i_mode) &&
1262 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1263 error = gfs2_dir_exhash_dealloc(ip);
1264 if (error)
1265 goto out_unlock;
1266 }
1267
1268 if (ip->i_eattr) {
1269 error = gfs2_ea_dealloc(ip);
1270 if (error)
1271 goto out_unlock;
1272 }
1273
1274 if (!gfs2_is_stuffed(ip)) {
1275 error = gfs2_file_dealloc(ip);
1276 if (error)
1277 goto out_unlock;
1278 }
1279
1280 error = gfs2_dinode_dealloc(ip);
1281 if (error)
1282 goto out_unlock;
1283
1284 out_truncate:
1285 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1286 if (error)
1287 goto out_unlock;
1288 /* Needs to be done before glock release & also in a transaction */
1289 truncate_inode_pages(&inode->i_data, 0);
1290 gfs2_trans_end(sdp);
1291
1292 out_unlock:
1293 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1294 gfs2_glock_dq(&ip->i_iopen_gh);
1295 gfs2_holder_uninit(&ip->i_iopen_gh);
1296 gfs2_glock_dq_uninit(&gh);
1297 if (error && error != GLR_TRYFAILED && error != -EROFS)
1298 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1299 out:
1300 truncate_inode_pages(&inode->i_data, 0);
1301 clear_inode(inode);
1302 }
1303
1304 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1305 {
1306 struct gfs2_inode *ip;
1307
1308 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1309 if (ip) {
1310 ip->i_flags = 0;
1311 ip->i_gl = NULL;
1312 }
1313 return &ip->i_inode;
1314 }
1315
1316 static void gfs2_destroy_inode(struct inode *inode)
1317 {
1318 kmem_cache_free(gfs2_inode_cachep, inode);
1319 }
1320
1321 const struct super_operations gfs2_super_ops = {
1322 .alloc_inode = gfs2_alloc_inode,
1323 .destroy_inode = gfs2_destroy_inode,
1324 .write_inode = gfs2_write_inode,
1325 .delete_inode = gfs2_delete_inode,
1326 .put_super = gfs2_put_super,
1327 .sync_fs = gfs2_sync_fs,
1328 .freeze_fs = gfs2_freeze,
1329 .unfreeze_fs = gfs2_unfreeze,
1330 .statfs = gfs2_statfs,
1331 .remount_fs = gfs2_remount_fs,
1332 .clear_inode = gfs2_clear_inode,
1333 .drop_inode = gfs2_drop_inode,
1334 .show_options = gfs2_show_options,
1335 };
1336
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree