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V4L/DVB: IR: add empty lirc pseudo-keymap
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / super.c
blob4d1aad38f1b136535ad6b568f3494d8ef3dec4ed
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 #include <linux/wait.h>
25 #include <linux/writeback.h>
26
27 #include "gfs2.h"
28 #include "incore.h"
29 #include "bmap.h"
30 #include "dir.h"
31 #include "glock.h"
32 #include "glops.h"
33 #include "inode.h"
34 #include "log.h"
35 #include "meta_io.h"
36 #include "quota.h"
37 #include "recovery.h"
38 #include "rgrp.h"
39 #include "super.h"
40 #include "trans.h"
41 #include "util.h"
42 #include "sys.h"
43 #include "xattr.h"
44
45 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
46
47 enum {
48 Opt_lockproto,
49 Opt_locktable,
50 Opt_hostdata,
51 Opt_spectator,
52 Opt_ignore_local_fs,
53 Opt_localflocks,
54 Opt_localcaching,
55 Opt_debug,
56 Opt_nodebug,
57 Opt_upgrade,
58 Opt_acl,
59 Opt_noacl,
60 Opt_quota_off,
61 Opt_quota_account,
62 Opt_quota_on,
63 Opt_quota,
64 Opt_noquota,
65 Opt_suiddir,
66 Opt_nosuiddir,
67 Opt_data_writeback,
68 Opt_data_ordered,
69 Opt_meta,
70 Opt_discard,
71 Opt_nodiscard,
72 Opt_commit,
73 Opt_err_withdraw,
74 Opt_err_panic,
75 Opt_statfs_quantum,
76 Opt_statfs_percent,
77 Opt_quota_quantum,
78 Opt_barrier,
79 Opt_nobarrier,
80 Opt_error,
81 };
82
83 static const match_table_t tokens = {
84 {Opt_lockproto, "lockproto=%s"},
85 {Opt_locktable, "locktable=%s"},
86 {Opt_hostdata, "hostdata=%s"},
87 {Opt_spectator, "spectator"},
88 {Opt_ignore_local_fs, "ignore_local_fs"},
89 {Opt_localflocks, "localflocks"},
90 {Opt_localcaching, "localcaching"},
91 {Opt_debug, "debug"},
92 {Opt_nodebug, "nodebug"},
93 {Opt_upgrade, "upgrade"},
94 {Opt_acl, "acl"},
95 {Opt_noacl, "noacl"},
96 {Opt_quota_off, "quota=off"},
97 {Opt_quota_account, "quota=account"},
98 {Opt_quota_on, "quota=on"},
99 {Opt_quota, "quota"},
100 {Opt_noquota, "noquota"},
101 {Opt_suiddir, "suiddir"},
102 {Opt_nosuiddir, "nosuiddir"},
103 {Opt_data_writeback, "data=writeback"},
104 {Opt_data_ordered, "data=ordered"},
105 {Opt_meta, "meta"},
106 {Opt_discard, "discard"},
107 {Opt_nodiscard, "nodiscard"},
108 {Opt_commit, "commit=%d"},
109 {Opt_err_withdraw, "errors=withdraw"},
110 {Opt_err_panic, "errors=panic"},
111 {Opt_statfs_quantum, "statfs_quantum=%d"},
112 {Opt_statfs_percent, "statfs_percent=%d"},
113 {Opt_quota_quantum, "quota_quantum=%d"},
114 {Opt_barrier, "barrier"},
115 {Opt_nobarrier, "nobarrier"},
116 {Opt_error, NULL}
117 };
118
119 /**
120 * gfs2_mount_args - Parse mount options
121 * @args: The structure into which the parsed options will be written
122 * @options: The options to parse
123 *
124 * Return: errno
125 */
126
127 int gfs2_mount_args(struct gfs2_args *args, char *options)
128 {
129 char *o;
130 int token;
131 substring_t tmp[MAX_OPT_ARGS];
132 int rv;
133
134 /* Split the options into tokens with the "," character and
135 process them */
136
137 while (1) {
138 o = strsep(&options, ",");
139 if (o == NULL)
140 break;
141 if (*o == '\0')
142 continue;
143
144 token = match_token(o, tokens, tmp);
145 switch (token) {
146 case Opt_lockproto:
147 match_strlcpy(args->ar_lockproto, &tmp[0],
148 GFS2_LOCKNAME_LEN);
149 break;
150 case Opt_locktable:
151 match_strlcpy(args->ar_locktable, &tmp[0],
152 GFS2_LOCKNAME_LEN);
153 break;
154 case Opt_hostdata:
155 match_strlcpy(args->ar_hostdata, &tmp[0],
156 GFS2_LOCKNAME_LEN);
157 break;
158 case Opt_spectator:
159 args->ar_spectator = 1;
160 break;
161 case Opt_ignore_local_fs:
162 args->ar_ignore_local_fs = 1;
163 break;
164 case Opt_localflocks:
165 args->ar_localflocks = 1;
166 break;
167 case Opt_localcaching:
168 args->ar_localcaching = 1;
169 break;
170 case Opt_debug:
171 if (args->ar_errors == GFS2_ERRORS_PANIC) {
172 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
173 "are mutually exclusive.\n");
174 return -EINVAL;
175 }
176 args->ar_debug = 1;
177 break;
178 case Opt_nodebug:
179 args->ar_debug = 0;
180 break;
181 case Opt_upgrade:
182 args->ar_upgrade = 1;
183 break;
184 case Opt_acl:
185 args->ar_posix_acl = 1;
186 break;
187 case Opt_noacl:
188 args->ar_posix_acl = 0;
189 break;
190 case Opt_quota_off:
191 case Opt_noquota:
192 args->ar_quota = GFS2_QUOTA_OFF;
193 break;
194 case Opt_quota_account:
195 args->ar_quota = GFS2_QUOTA_ACCOUNT;
196 break;
197 case Opt_quota_on:
198 case Opt_quota:
199 args->ar_quota = GFS2_QUOTA_ON;
200 break;
201 case Opt_suiddir:
202 args->ar_suiddir = 1;
203 break;
204 case Opt_nosuiddir:
205 args->ar_suiddir = 0;
206 break;
207 case Opt_data_writeback:
208 args->ar_data = GFS2_DATA_WRITEBACK;
209 break;
210 case Opt_data_ordered:
211 args->ar_data = GFS2_DATA_ORDERED;
212 break;
213 case Opt_meta:
214 args->ar_meta = 1;
215 break;
216 case Opt_discard:
217 args->ar_discard = 1;
218 break;
219 case Opt_nodiscard:
220 args->ar_discard = 0;
221 break;
222 case Opt_commit:
223 rv = match_int(&tmp[0], &args->ar_commit);
224 if (rv || args->ar_commit <= 0) {
225 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
226 return rv ? rv : -EINVAL;
227 }
228 break;
229 case Opt_statfs_quantum:
230 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
231 if (rv || args->ar_statfs_quantum < 0) {
232 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
233 return rv ? rv : -EINVAL;
234 }
235 break;
236 case Opt_quota_quantum:
237 rv = match_int(&tmp[0], &args->ar_quota_quantum);
238 if (rv || args->ar_quota_quantum <= 0) {
239 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
240 return rv ? rv : -EINVAL;
241 }
242 break;
243 case Opt_statfs_percent:
244 rv = match_int(&tmp[0], &args->ar_statfs_percent);
245 if (rv || args->ar_statfs_percent < 0 ||
246 args->ar_statfs_percent > 100) {
247 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
248 return rv ? rv : -EINVAL;
249 }
250 break;
251 case Opt_err_withdraw:
252 args->ar_errors = GFS2_ERRORS_WITHDRAW;
253 break;
254 case Opt_err_panic:
255 if (args->ar_debug) {
256 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
257 "are mutually exclusive.\n");
258 return -EINVAL;
259 }
260 args->ar_errors = GFS2_ERRORS_PANIC;
261 break;
262 case Opt_barrier:
263 args->ar_nobarrier = 0;
264 break;
265 case Opt_nobarrier:
266 args->ar_nobarrier = 1;
267 break;
268 case Opt_error:
269 default:
270 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
271 return -EINVAL;
272 }
273 }
274
275 return 0;
276 }
277
278 /**
279 * gfs2_jindex_free - Clear all the journal index information
280 * @sdp: The GFS2 superblock
281 *
282 */
283
284 void gfs2_jindex_free(struct gfs2_sbd *sdp)
285 {
286 struct list_head list, *head;
287 struct gfs2_jdesc *jd;
288 struct gfs2_journal_extent *jext;
289
290 spin_lock(&sdp->sd_jindex_spin);
291 list_add(&list, &sdp->sd_jindex_list);
292 list_del_init(&sdp->sd_jindex_list);
293 sdp->sd_journals = 0;
294 spin_unlock(&sdp->sd_jindex_spin);
295
296 while (!list_empty(&list)) {
297 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
298 head = &jd->extent_list;
299 while (!list_empty(head)) {
300 jext = list_entry(head->next,
301 struct gfs2_journal_extent,
302 extent_list);
303 list_del(&jext->extent_list);
304 kfree(jext);
305 }
306 list_del(&jd->jd_list);
307 iput(jd->jd_inode);
308 kfree(jd);
309 }
310 }
311
312 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
313 {
314 struct gfs2_jdesc *jd;
315 int found = 0;
316
317 list_for_each_entry(jd, head, jd_list) {
318 if (jd->jd_jid == jid) {
319 found = 1;
320 break;
321 }
322 }
323
324 if (!found)
325 jd = NULL;
326
327 return jd;
328 }
329
330 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
331 {
332 struct gfs2_jdesc *jd;
333
334 spin_lock(&sdp->sd_jindex_spin);
335 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
336 spin_unlock(&sdp->sd_jindex_spin);
337
338 return jd;
339 }
340
341 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
342 {
343 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
344 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
345 int ar;
346 int error;
347
348 if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
349 (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
350 gfs2_consist_inode(ip);
351 return -EIO;
352 }
353 jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
354
355 error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
356 if (!error && ar) {
357 gfs2_consist_inode(ip);
358 error = -EIO;
359 }
360
361 return error;
362 }
363
364 /**
365 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
366 * @sdp: the filesystem
367 *
368 * Returns: errno
369 */
370
371 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
372 {
373 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
374 struct gfs2_glock *j_gl = ip->i_gl;
375 struct gfs2_holder t_gh;
376 struct gfs2_log_header_host head;
377 int error;
378
379 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
380 if (error)
381 return error;
382
383 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
384
385 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
386 if (error)
387 goto fail;
388
389 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
390 gfs2_consist(sdp);
391 error = -EIO;
392 goto fail;
393 }
394
395 /* Initialize some head of the log stuff */
396 sdp->sd_log_sequence = head.lh_sequence + 1;
397 gfs2_log_pointers_init(sdp, head.lh_blkno);
398
399 error = gfs2_quota_init(sdp);
400 if (error)
401 goto fail;
402
403 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
404
405 gfs2_glock_dq_uninit(&t_gh);
406
407 return 0;
408
409 fail:
410 t_gh.gh_flags |= GL_NOCACHE;
411 gfs2_glock_dq_uninit(&t_gh);
412
413 return error;
414 }
415
416 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
417 {
418 const struct gfs2_statfs_change *str = buf;
419
420 sc->sc_total = be64_to_cpu(str->sc_total);
421 sc->sc_free = be64_to_cpu(str->sc_free);
422 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
423 }
424
425 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
426 {
427 struct gfs2_statfs_change *str = buf;
428
429 str->sc_total = cpu_to_be64(sc->sc_total);
430 str->sc_free = cpu_to_be64(sc->sc_free);
431 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
432 }
433
434 int gfs2_statfs_init(struct gfs2_sbd *sdp)
435 {
436 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
437 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
438 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
439 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
440 struct buffer_head *m_bh, *l_bh;
441 struct gfs2_holder gh;
442 int error;
443
444 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
445 &gh);
446 if (error)
447 return error;
448
449 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
450 if (error)
451 goto out;
452
453 if (sdp->sd_args.ar_spectator) {
454 spin_lock(&sdp->sd_statfs_spin);
455 gfs2_statfs_change_in(m_sc, m_bh->b_data +
456 sizeof(struct gfs2_dinode));
457 spin_unlock(&sdp->sd_statfs_spin);
458 } else {
459 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
460 if (error)
461 goto out_m_bh;
462
463 spin_lock(&sdp->sd_statfs_spin);
464 gfs2_statfs_change_in(m_sc, m_bh->b_data +
465 sizeof(struct gfs2_dinode));
466 gfs2_statfs_change_in(l_sc, l_bh->b_data +
467 sizeof(struct gfs2_dinode));
468 spin_unlock(&sdp->sd_statfs_spin);
469
470 brelse(l_bh);
471 }
472
473 out_m_bh:
474 brelse(m_bh);
475 out:
476 gfs2_glock_dq_uninit(&gh);
477 return 0;
478 }
479
480 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
481 s64 dinodes)
482 {
483 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
484 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
485 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
486 struct buffer_head *l_bh;
487 s64 x, y;
488 int need_sync = 0;
489 int error;
490
491 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
492 if (error)
493 return;
494
495 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
496
497 spin_lock(&sdp->sd_statfs_spin);
498 l_sc->sc_total += total;
499 l_sc->sc_free += free;
500 l_sc->sc_dinodes += dinodes;
501 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
502 if (sdp->sd_args.ar_statfs_percent) {
503 x = 100 * l_sc->sc_free;
504 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
505 if (x >= y || x <= -y)
506 need_sync = 1;
507 }
508 spin_unlock(&sdp->sd_statfs_spin);
509
510 brelse(l_bh);
511 if (need_sync)
512 gfs2_wake_up_statfs(sdp);
513 }
514
515 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
516 struct buffer_head *l_bh)
517 {
518 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
519 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
520 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
521 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
522
523 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
524
525 spin_lock(&sdp->sd_statfs_spin);
526 m_sc->sc_total += l_sc->sc_total;
527 m_sc->sc_free += l_sc->sc_free;
528 m_sc->sc_dinodes += l_sc->sc_dinodes;
529 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
530 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
531 0, sizeof(struct gfs2_statfs_change));
532 spin_unlock(&sdp->sd_statfs_spin);
533
534 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
535 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
536 }
537
538 int gfs2_statfs_sync(struct super_block *sb, int type)
539 {
540 struct gfs2_sbd *sdp = sb->s_fs_info;
541 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
542 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
543 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
544 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
545 struct gfs2_holder gh;
546 struct buffer_head *m_bh, *l_bh;
547 int error;
548
549 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
550 &gh);
551 if (error)
552 return error;
553
554 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
555 if (error)
556 goto out;
557
558 spin_lock(&sdp->sd_statfs_spin);
559 gfs2_statfs_change_in(m_sc, m_bh->b_data +
560 sizeof(struct gfs2_dinode));
561 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
562 spin_unlock(&sdp->sd_statfs_spin);
563 goto out_bh;
564 }
565 spin_unlock(&sdp->sd_statfs_spin);
566
567 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
568 if (error)
569 goto out_bh;
570
571 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
572 if (error)
573 goto out_bh2;
574
575 update_statfs(sdp, m_bh, l_bh);
576 sdp->sd_statfs_force_sync = 0;
577
578 gfs2_trans_end(sdp);
579
580 out_bh2:
581 brelse(l_bh);
582 out_bh:
583 brelse(m_bh);
584 out:
585 gfs2_glock_dq_uninit(&gh);
586 return error;
587 }
588
589 struct lfcc {
590 struct list_head list;
591 struct gfs2_holder gh;
592 };
593
594 /**
595 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
596 * journals are clean
597 * @sdp: the file system
598 * @state: the state to put the transaction lock into
599 * @t_gh: the hold on the transaction lock
600 *
601 * Returns: errno
602 */
603
604 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
605 struct gfs2_holder *t_gh)
606 {
607 struct gfs2_inode *ip;
608 struct gfs2_jdesc *jd;
609 struct lfcc *lfcc;
610 LIST_HEAD(list);
611 struct gfs2_log_header_host lh;
612 int error;
613
614 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
615 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
616 if (!lfcc) {
617 error = -ENOMEM;
618 goto out;
619 }
620 ip = GFS2_I(jd->jd_inode);
621 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
622 if (error) {
623 kfree(lfcc);
624 goto out;
625 }
626 list_add(&lfcc->list, &list);
627 }
628
629 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
630 GL_NOCACHE, t_gh);
631
632 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
633 error = gfs2_jdesc_check(jd);
634 if (error)
635 break;
636 error = gfs2_find_jhead(jd, &lh);
637 if (error)
638 break;
639 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
640 error = -EBUSY;
641 break;
642 }
643 }
644
645 if (error)
646 gfs2_glock_dq_uninit(t_gh);
647
648 out:
649 while (!list_empty(&list)) {
650 lfcc = list_entry(list.next, struct lfcc, list);
651 list_del(&lfcc->list);
652 gfs2_glock_dq_uninit(&lfcc->gh);
653 kfree(lfcc);
654 }
655 return error;
656 }
657
658 /**
659 * gfs2_freeze_fs - freezes the file system
660 * @sdp: the file system
661 *
662 * This function flushes data and meta data for all machines by
663 * aquiring the transaction log exclusively. All journals are
664 * ensured to be in a clean state as well.
665 *
666 * Returns: errno
667 */
668
669 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
670 {
671 int error = 0;
672
673 mutex_lock(&sdp->sd_freeze_lock);
674
675 if (!sdp->sd_freeze_count++) {
676 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
677 if (error)
678 sdp->sd_freeze_count--;
679 }
680
681 mutex_unlock(&sdp->sd_freeze_lock);
682
683 return error;
684 }
685
686 /**
687 * gfs2_unfreeze_fs - unfreezes the file system
688 * @sdp: the file system
689 *
690 * This function allows the file system to proceed by unlocking
691 * the exclusively held transaction lock. Other GFS2 nodes are
692 * now free to acquire the lock shared and go on with their lives.
693 *
694 */
695
696 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
697 {
698 mutex_lock(&sdp->sd_freeze_lock);
699
700 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
701 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
702
703 mutex_unlock(&sdp->sd_freeze_lock);
704 }
705
706
707 /**
708 * gfs2_write_inode - Make sure the inode is stable on the disk
709 * @inode: The inode
710 * @sync: synchronous write flag
711 *
712 * Returns: errno
713 */
714
715 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
716 {
717 struct gfs2_inode *ip = GFS2_I(inode);
718 struct gfs2_sbd *sdp = GFS2_SB(inode);
719 struct gfs2_holder gh;
720 struct buffer_head *bh;
721 struct timespec atime;
722 struct gfs2_dinode *di;
723 int ret = 0;
724
725 /* Check this is a "normal" inode, etc */
726 if (current->flags & PF_MEMALLOC)
727 return 0;
728 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
729 if (ret)
730 goto do_flush;
731 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
732 if (ret)
733 goto do_unlock;
734 ret = gfs2_meta_inode_buffer(ip, &bh);
735 if (ret == 0) {
736 di = (struct gfs2_dinode *)bh->b_data;
737 atime.tv_sec = be64_to_cpu(di->di_atime);
738 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
739 if (timespec_compare(&inode->i_atime, &atime) > 0) {
740 gfs2_trans_add_bh(ip->i_gl, bh, 1);
741 gfs2_dinode_out(ip, bh->b_data);
742 }
743 brelse(bh);
744 }
745 gfs2_trans_end(sdp);
746 do_unlock:
747 gfs2_glock_dq_uninit(&gh);
748 do_flush:
749 if (wbc->sync_mode == WB_SYNC_ALL)
750 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
751 return ret;
752 }
753
754 /**
755 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
756 * @sdp: the filesystem
757 *
758 * Returns: errno
759 */
760
761 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
762 {
763 struct gfs2_holder t_gh;
764 int error;
765
766 flush_workqueue(gfs2_delete_workqueue);
767 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
768 gfs2_statfs_sync(sdp->sd_vfs, 0);
769
770 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
771 &t_gh);
772 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
773 return error;
774
775 gfs2_meta_syncfs(sdp);
776 gfs2_log_shutdown(sdp);
777
778 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
779
780 if (t_gh.gh_gl)
781 gfs2_glock_dq_uninit(&t_gh);
782
783 gfs2_quota_cleanup(sdp);
784
785 return error;
786 }
787
788 static int gfs2_umount_recovery_wait(void *word)
789 {
790 schedule();
791 return 0;
792 }
793
794 /**
795 * gfs2_put_super - Unmount the filesystem
796 * @sb: The VFS superblock
797 *
798 */
799
800 static void gfs2_put_super(struct super_block *sb)
801 {
802 struct gfs2_sbd *sdp = sb->s_fs_info;
803 int error;
804 struct gfs2_jdesc *jd;
805
806 /* Unfreeze the filesystem, if we need to */
807
808 mutex_lock(&sdp->sd_freeze_lock);
809 if (sdp->sd_freeze_count)
810 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
811 mutex_unlock(&sdp->sd_freeze_lock);
812
813 /* No more recovery requests */
814 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
815 smp_mb();
816
817 /* Wait on outstanding recovery */
818 restart:
819 spin_lock(&sdp->sd_jindex_spin);
820 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
821 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
822 continue;
823 spin_unlock(&sdp->sd_jindex_spin);
824 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
825 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
826 goto restart;
827 }
828 spin_unlock(&sdp->sd_jindex_spin);
829
830 kthread_stop(sdp->sd_quotad_process);
831 kthread_stop(sdp->sd_logd_process);
832
833 if (!(sb->s_flags & MS_RDONLY)) {
834 error = gfs2_make_fs_ro(sdp);
835 if (error)
836 gfs2_io_error(sdp);
837 }
838 /* At this point, we're through modifying the disk */
839
840 /* Release stuff */
841
842 iput(sdp->sd_jindex);
843 iput(sdp->sd_statfs_inode);
844 iput(sdp->sd_rindex);
845 iput(sdp->sd_quota_inode);
846
847 gfs2_glock_put(sdp->sd_rename_gl);
848 gfs2_glock_put(sdp->sd_trans_gl);
849
850 if (!sdp->sd_args.ar_spectator) {
851 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
852 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
853 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
854 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
855 iput(sdp->sd_sc_inode);
856 iput(sdp->sd_qc_inode);
857 }
858
859 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
860 gfs2_clear_rgrpd(sdp);
861 gfs2_jindex_free(sdp);
862 /* Take apart glock structures and buffer lists */
863 invalidate_inodes(sdp->sd_vfs);
864 gfs2_gl_hash_clear(sdp);
865 /* Unmount the locking protocol */
866 gfs2_lm_unmount(sdp);
867
868 /* At this point, we're through participating in the lockspace */
869 gfs2_sys_fs_del(sdp);
870 }
871
872 /**
873 * gfs2_sync_fs - sync the filesystem
874 * @sb: the superblock
875 *
876 * Flushes the log to disk.
877 */
878
879 static int gfs2_sync_fs(struct super_block *sb, int wait)
880 {
881 if (wait && sb->s_fs_info)
882 gfs2_log_flush(sb->s_fs_info, NULL);
883 return 0;
884 }
885
886 /**
887 * gfs2_freeze - prevent further writes to the filesystem
888 * @sb: the VFS structure for the filesystem
889 *
890 */
891
892 static int gfs2_freeze(struct super_block *sb)
893 {
894 struct gfs2_sbd *sdp = sb->s_fs_info;
895 int error;
896
897 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
898 return -EINVAL;
899
900 for (;;) {
901 error = gfs2_freeze_fs(sdp);
902 if (!error)
903 break;
904
905 switch (error) {
906 case -EBUSY:
907 fs_err(sdp, "waiting for recovery before freeze\n");
908 break;
909
910 default:
911 fs_err(sdp, "error freezing FS: %d\n", error);
912 break;
913 }
914
915 fs_err(sdp, "retrying...\n");
916 msleep(1000);
917 }
918 return 0;
919 }
920
921 /**
922 * gfs2_unfreeze - reallow writes to the filesystem
923 * @sb: the VFS structure for the filesystem
924 *
925 */
926
927 static int gfs2_unfreeze(struct super_block *sb)
928 {
929 gfs2_unfreeze_fs(sb->s_fs_info);
930 return 0;
931 }
932
933 /**
934 * statfs_fill - fill in the sg for a given RG
935 * @rgd: the RG
936 * @sc: the sc structure
937 *
938 * Returns: 0 on success, -ESTALE if the LVB is invalid
939 */
940
941 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
942 struct gfs2_statfs_change_host *sc)
943 {
944 gfs2_rgrp_verify(rgd);
945 sc->sc_total += rgd->rd_data;
946 sc->sc_free += rgd->rd_free;
947 sc->sc_dinodes += rgd->rd_dinodes;
948 return 0;
949 }
950
951 /**
952 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
953 * @sdp: the filesystem
954 * @sc: the sc info that will be returned
955 *
956 * Any error (other than a signal) will cause this routine to fall back
957 * to the synchronous version.
958 *
959 * FIXME: This really shouldn't busy wait like this.
960 *
961 * Returns: errno
962 */
963
964 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
965 {
966 struct gfs2_holder ri_gh;
967 struct gfs2_rgrpd *rgd_next;
968 struct gfs2_holder *gha, *gh;
969 unsigned int slots = 64;
970 unsigned int x;
971 int done;
972 int error = 0, err;
973
974 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
975 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
976 if (!gha)
977 return -ENOMEM;
978
979 error = gfs2_rindex_hold(sdp, &ri_gh);
980 if (error)
981 goto out;
982
983 rgd_next = gfs2_rgrpd_get_first(sdp);
984
985 for (;;) {
986 done = 1;
987
988 for (x = 0; x < slots; x++) {
989 gh = gha + x;
990
991 if (gh->gh_gl && gfs2_glock_poll(gh)) {
992 err = gfs2_glock_wait(gh);
993 if (err) {
994 gfs2_holder_uninit(gh);
995 error = err;
996 } else {
997 if (!error)
998 error = statfs_slow_fill(
999 gh->gh_gl->gl_object, sc);
1000 gfs2_glock_dq_uninit(gh);
1001 }
1002 }
1003
1004 if (gh->gh_gl)
1005 done = 0;
1006 else if (rgd_next && !error) {
1007 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1008 LM_ST_SHARED,
1009 GL_ASYNC,
1010 gh);
1011 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1012 done = 0;
1013 }
1014
1015 if (signal_pending(current))
1016 error = -ERESTARTSYS;
1017 }
1018
1019 if (done)
1020 break;
1021
1022 yield();
1023 }
1024
1025 gfs2_glock_dq_uninit(&ri_gh);
1026
1027 out:
1028 kfree(gha);
1029 return error;
1030 }
1031
1032 /**
1033 * gfs2_statfs_i - Do a statfs
1034 * @sdp: the filesystem
1035 * @sg: the sg structure
1036 *
1037 * Returns: errno
1038 */
1039
1040 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1041 {
1042 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1043 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1044
1045 spin_lock(&sdp->sd_statfs_spin);
1046
1047 *sc = *m_sc;
1048 sc->sc_total += l_sc->sc_total;
1049 sc->sc_free += l_sc->sc_free;
1050 sc->sc_dinodes += l_sc->sc_dinodes;
1051
1052 spin_unlock(&sdp->sd_statfs_spin);
1053
1054 if (sc->sc_free < 0)
1055 sc->sc_free = 0;
1056 if (sc->sc_free > sc->sc_total)
1057 sc->sc_free = sc->sc_total;
1058 if (sc->sc_dinodes < 0)
1059 sc->sc_dinodes = 0;
1060
1061 return 0;
1062 }
1063
1064 /**
1065 * gfs2_statfs - Gather and return stats about the filesystem
1066 * @sb: The superblock
1067 * @statfsbuf: The buffer
1068 *
1069 * Returns: 0 on success or error code
1070 */
1071
1072 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1073 {
1074 struct super_block *sb = dentry->d_inode->i_sb;
1075 struct gfs2_sbd *sdp = sb->s_fs_info;
1076 struct gfs2_statfs_change_host sc;
1077 int error;
1078
1079 if (gfs2_tune_get(sdp, gt_statfs_slow))
1080 error = gfs2_statfs_slow(sdp, &sc);
1081 else
1082 error = gfs2_statfs_i(sdp, &sc);
1083
1084 if (error)
1085 return error;
1086
1087 buf->f_type = GFS2_MAGIC;
1088 buf->f_bsize = sdp->sd_sb.sb_bsize;
1089 buf->f_blocks = sc.sc_total;
1090 buf->f_bfree = sc.sc_free;
1091 buf->f_bavail = sc.sc_free;
1092 buf->f_files = sc.sc_dinodes + sc.sc_free;
1093 buf->f_ffree = sc.sc_free;
1094 buf->f_namelen = GFS2_FNAMESIZE;
1095
1096 return 0;
1097 }
1098
1099 /**
1100 * gfs2_remount_fs - called when the FS is remounted
1101 * @sb: the filesystem
1102 * @flags: the remount flags
1103 * @data: extra data passed in (not used right now)
1104 *
1105 * Returns: errno
1106 */
1107
1108 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1109 {
1110 struct gfs2_sbd *sdp = sb->s_fs_info;
1111 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1112 struct gfs2_tune *gt = &sdp->sd_tune;
1113 int error;
1114
1115 spin_lock(&gt->gt_spin);
1116 args.ar_commit = gt->gt_logd_secs;
1117 args.ar_quota_quantum = gt->gt_quota_quantum;
1118 if (gt->gt_statfs_slow)
1119 args.ar_statfs_quantum = 0;
1120 else
1121 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1122 spin_unlock(&gt->gt_spin);
1123 error = gfs2_mount_args(&args, data);
1124 if (error)
1125 return error;
1126
1127 /* Not allowed to change locking details */
1128 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1129 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1130 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1131 return -EINVAL;
1132
1133 /* Some flags must not be changed */
1134 if (args_neq(&args, &sdp->sd_args, spectator) ||
1135 args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1136 args_neq(&args, &sdp->sd_args, localflocks) ||
1137 args_neq(&args, &sdp->sd_args, localcaching) ||
1138 args_neq(&args, &sdp->sd_args, meta))
1139 return -EINVAL;
1140
1141 if (sdp->sd_args.ar_spectator)
1142 *flags |= MS_RDONLY;
1143
1144 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1145 if (*flags & MS_RDONLY)
1146 error = gfs2_make_fs_ro(sdp);
1147 else
1148 error = gfs2_make_fs_rw(sdp);
1149 if (error)
1150 return error;
1151 }
1152
1153 sdp->sd_args = args;
1154 if (sdp->sd_args.ar_posix_acl)
1155 sb->s_flags |= MS_POSIXACL;
1156 else
1157 sb->s_flags &= ~MS_POSIXACL;
1158 if (sdp->sd_args.ar_nobarrier)
1159 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1160 else
1161 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1162 spin_lock(&gt->gt_spin);
1163 gt->gt_logd_secs = args.ar_commit;
1164 gt->gt_quota_quantum = args.ar_quota_quantum;
1165 if (args.ar_statfs_quantum) {
1166 gt->gt_statfs_slow = 0;
1167 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1168 }
1169 else {
1170 gt->gt_statfs_slow = 1;
1171 gt->gt_statfs_quantum = 30;
1172 }
1173 spin_unlock(&gt->gt_spin);
1174
1175 gfs2_online_uevent(sdp);
1176 return 0;
1177 }
1178
1179 /**
1180 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1181 * @inode: The inode to drop
1182 *
1183 * If we've received a callback on an iopen lock then its because a
1184 * remote node tried to deallocate the inode but failed due to this node
1185 * still having the inode open. Here we mark the link count zero
1186 * since we know that it must have reached zero if the GLF_DEMOTE flag
1187 * is set on the iopen glock. If we didn't do a disk read since the
1188 * remote node removed the final link then we might otherwise miss
1189 * this event. This check ensures that this node will deallocate the
1190 * inode's blocks, or alternatively pass the baton on to another
1191 * node for later deallocation.
1192 */
1193
1194 static void gfs2_drop_inode(struct inode *inode)
1195 {
1196 struct gfs2_inode *ip = GFS2_I(inode);
1197
1198 if (inode->i_nlink) {
1199 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1200 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1201 clear_nlink(inode);
1202 }
1203 generic_drop_inode(inode);
1204 }
1205
1206 /**
1207 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1208 * @inode: The VFS inode
1209 *
1210 */
1211
1212 static void gfs2_clear_inode(struct inode *inode)
1213 {
1214 struct gfs2_inode *ip = GFS2_I(inode);
1215
1216 ip->i_gl->gl_object = NULL;
1217 gfs2_glock_put(ip->i_gl);
1218 ip->i_gl = NULL;
1219 if (ip->i_iopen_gh.gh_gl) {
1220 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1221 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1222 }
1223 }
1224
1225 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1226 {
1227 do {
1228 if (d1 == d2)
1229 return 1;
1230 d1 = d1->d_parent;
1231 } while (!IS_ROOT(d1));
1232 return 0;
1233 }
1234
1235 /**
1236 * gfs2_show_options - Show mount options for /proc/mounts
1237 * @s: seq_file structure
1238 * @mnt: vfsmount
1239 *
1240 * Returns: 0 on success or error code
1241 */
1242
1243 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1244 {
1245 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1246 struct gfs2_args *args = &sdp->sd_args;
1247 int val;
1248
1249 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1250 seq_printf(s, ",meta");
1251 if (args->ar_lockproto[0])
1252 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1253 if (args->ar_locktable[0])
1254 seq_printf(s, ",locktable=%s", args->ar_locktable);
1255 if (args->ar_hostdata[0])
1256 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1257 if (args->ar_spectator)
1258 seq_printf(s, ",spectator");
1259 if (args->ar_ignore_local_fs)
1260 seq_printf(s, ",ignore_local_fs");
1261 if (args->ar_localflocks)
1262 seq_printf(s, ",localflocks");
1263 if (args->ar_localcaching)
1264 seq_printf(s, ",localcaching");
1265 if (args->ar_debug)
1266 seq_printf(s, ",debug");
1267 if (args->ar_upgrade)
1268 seq_printf(s, ",upgrade");
1269 if (args->ar_posix_acl)
1270 seq_printf(s, ",acl");
1271 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1272 char *state;
1273 switch (args->ar_quota) {
1274 case GFS2_QUOTA_OFF:
1275 state = "off";
1276 break;
1277 case GFS2_QUOTA_ACCOUNT:
1278 state = "account";
1279 break;
1280 case GFS2_QUOTA_ON:
1281 state = "on";
1282 break;
1283 default:
1284 state = "unknown";
1285 break;
1286 }
1287 seq_printf(s, ",quota=%s", state);
1288 }
1289 if (args->ar_suiddir)
1290 seq_printf(s, ",suiddir");
1291 if (args->ar_data != GFS2_DATA_DEFAULT) {
1292 char *state;
1293 switch (args->ar_data) {
1294 case GFS2_DATA_WRITEBACK:
1295 state = "writeback";
1296 break;
1297 case GFS2_DATA_ORDERED:
1298 state = "ordered";
1299 break;
1300 default:
1301 state = "unknown";
1302 break;
1303 }
1304 seq_printf(s, ",data=%s", state);
1305 }
1306 if (args->ar_discard)
1307 seq_printf(s, ",discard");
1308 val = sdp->sd_tune.gt_logd_secs;
1309 if (val != 30)
1310 seq_printf(s, ",commit=%d", val);
1311 val = sdp->sd_tune.gt_statfs_quantum;
1312 if (val != 30)
1313 seq_printf(s, ",statfs_quantum=%d", val);
1314 val = sdp->sd_tune.gt_quota_quantum;
1315 if (val != 60)
1316 seq_printf(s, ",quota_quantum=%d", val);
1317 if (args->ar_statfs_percent)
1318 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1319 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1320 const char *state;
1321
1322 switch (args->ar_errors) {
1323 case GFS2_ERRORS_WITHDRAW:
1324 state = "withdraw";
1325 break;
1326 case GFS2_ERRORS_PANIC:
1327 state = "panic";
1328 break;
1329 default:
1330 state = "unknown";
1331 break;
1332 }
1333 seq_printf(s, ",errors=%s", state);
1334 }
1335 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1336 seq_printf(s, ",nobarrier");
1337 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1338 seq_printf(s, ",demote_interface_used");
1339 return 0;
1340 }
1341
1342 /*
1343 * We have to (at the moment) hold the inodes main lock to cover
1344 * the gap between unlocking the shared lock on the iopen lock and
1345 * taking the exclusive lock. I'd rather do a shared -> exclusive
1346 * conversion on the iopen lock, but we can change that later. This
1347 * is safe, just less efficient.
1348 */
1349
1350 static void gfs2_delete_inode(struct inode *inode)
1351 {
1352 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1353 struct gfs2_inode *ip = GFS2_I(inode);
1354 struct gfs2_holder gh;
1355 int error;
1356
1357 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1358 if (unlikely(error)) {
1359 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1360 goto out;
1361 }
1362
1363 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1364 if (error)
1365 goto out_truncate;
1366
1367 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1368 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1369 error = gfs2_glock_nq(&ip->i_iopen_gh);
1370 if (error)
1371 goto out_truncate;
1372
1373 if (S_ISDIR(inode->i_mode) &&
1374 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1375 error = gfs2_dir_exhash_dealloc(ip);
1376 if (error)
1377 goto out_unlock;
1378 }
1379
1380 if (ip->i_eattr) {
1381 error = gfs2_ea_dealloc(ip);
1382 if (error)
1383 goto out_unlock;
1384 }
1385
1386 if (!gfs2_is_stuffed(ip)) {
1387 error = gfs2_file_dealloc(ip);
1388 if (error)
1389 goto out_unlock;
1390 }
1391
1392 error = gfs2_dinode_dealloc(ip);
1393 if (error)
1394 goto out_unlock;
1395
1396 out_truncate:
1397 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1398 if (error)
1399 goto out_unlock;
1400 /* Needs to be done before glock release & also in a transaction */
1401 truncate_inode_pages(&inode->i_data, 0);
1402 gfs2_trans_end(sdp);
1403
1404 out_unlock:
1405 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1406 gfs2_glock_dq(&ip->i_iopen_gh);
1407 gfs2_holder_uninit(&ip->i_iopen_gh);
1408 gfs2_glock_dq_uninit(&gh);
1409 if (error && error != GLR_TRYFAILED && error != -EROFS)
1410 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1411 out:
1412 truncate_inode_pages(&inode->i_data, 0);
1413 clear_inode(inode);
1414 }
1415
1416 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1417 {
1418 struct gfs2_inode *ip;
1419
1420 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1421 if (ip) {
1422 ip->i_flags = 0;
1423 ip->i_gl = NULL;
1424 }
1425 return &ip->i_inode;
1426 }
1427
1428 static void gfs2_destroy_inode(struct inode *inode)
1429 {
1430 kmem_cache_free(gfs2_inode_cachep, inode);
1431 }
1432
1433 const struct super_operations gfs2_super_ops = {
1434 .alloc_inode = gfs2_alloc_inode,
1435 .destroy_inode = gfs2_destroy_inode,
1436 .write_inode = gfs2_write_inode,
1437 .delete_inode = gfs2_delete_inode,
1438 .put_super = gfs2_put_super,
1439 .sync_fs = gfs2_sync_fs,
1440 .freeze_fs = gfs2_freeze,
1441 .unfreeze_fs = gfs2_unfreeze,
1442 .statfs = gfs2_statfs,
1443 .remount_fs = gfs2_remount_fs,
1444 .clear_inode = gfs2_clear_inode,
1445 .drop_inode = gfs2_drop_inode,
1446 .show_options = gfs2_show_options,
1447 };
1448
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree