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Linux 2.6.33
[pohmelfs.git] / fs / gfs2 / super.c
blobb9dd3da22c0a3fc5452a018cb25dfab89fa6ecf0
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
26 #include "gfs2.h"
27 #include "incore.h"
28 #include "bmap.h"
29 #include "dir.h"
30 #include "glock.h"
31 #include "glops.h"
32 #include "inode.h"
33 #include "log.h"
34 #include "meta_io.h"
35 #include "quota.h"
36 #include "recovery.h"
37 #include "rgrp.h"
38 #include "super.h"
39 #include "trans.h"
40 #include "util.h"
41 #include "sys.h"
42 #include "xattr.h"
43
44 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
45
46 enum {
47 Opt_lockproto,
48 Opt_locktable,
49 Opt_hostdata,
50 Opt_spectator,
51 Opt_ignore_local_fs,
52 Opt_localflocks,
53 Opt_localcaching,
54 Opt_debug,
55 Opt_nodebug,
56 Opt_upgrade,
57 Opt_acl,
58 Opt_noacl,
59 Opt_quota_off,
60 Opt_quota_account,
61 Opt_quota_on,
62 Opt_quota,
63 Opt_noquota,
64 Opt_suiddir,
65 Opt_nosuiddir,
66 Opt_data_writeback,
67 Opt_data_ordered,
68 Opt_meta,
69 Opt_discard,
70 Opt_nodiscard,
71 Opt_commit,
72 Opt_err_withdraw,
73 Opt_err_panic,
74 Opt_statfs_quantum,
75 Opt_statfs_percent,
76 Opt_quota_quantum,
77 Opt_barrier,
78 Opt_nobarrier,
79 Opt_error,
80 };
81
82 static const match_table_t tokens = {
83 {Opt_lockproto, "lockproto=%s"},
84 {Opt_locktable, "locktable=%s"},
85 {Opt_hostdata, "hostdata=%s"},
86 {Opt_spectator, "spectator"},
87 {Opt_ignore_local_fs, "ignore_local_fs"},
88 {Opt_localflocks, "localflocks"},
89 {Opt_localcaching, "localcaching"},
90 {Opt_debug, "debug"},
91 {Opt_nodebug, "nodebug"},
92 {Opt_upgrade, "upgrade"},
93 {Opt_acl, "acl"},
94 {Opt_noacl, "noacl"},
95 {Opt_quota_off, "quota=off"},
96 {Opt_quota_account, "quota=account"},
97 {Opt_quota_on, "quota=on"},
98 {Opt_quota, "quota"},
99 {Opt_noquota, "noquota"},
100 {Opt_suiddir, "suiddir"},
101 {Opt_nosuiddir, "nosuiddir"},
102 {Opt_data_writeback, "data=writeback"},
103 {Opt_data_ordered, "data=ordered"},
104 {Opt_meta, "meta"},
105 {Opt_discard, "discard"},
106 {Opt_nodiscard, "nodiscard"},
107 {Opt_commit, "commit=%d"},
108 {Opt_err_withdraw, "errors=withdraw"},
109 {Opt_err_panic, "errors=panic"},
110 {Opt_statfs_quantum, "statfs_quantum=%d"},
111 {Opt_statfs_percent, "statfs_percent=%d"},
112 {Opt_quota_quantum, "quota_quantum=%d"},
113 {Opt_barrier, "barrier"},
114 {Opt_nobarrier, "nobarrier"},
115 {Opt_error, NULL}
116 };
117
118 /**
119 * gfs2_mount_args - Parse mount options
120 * @args: The structure into which the parsed options will be written
121 * @options: The options to parse
122 *
123 * Return: errno
124 */
125
126 int gfs2_mount_args(struct gfs2_args *args, char *options)
127 {
128 char *o;
129 int token;
130 substring_t tmp[MAX_OPT_ARGS];
131 int rv;
132
133 /* Split the options into tokens with the "," character and
134 process them */
135
136 while (1) {
137 o = strsep(&options, ",");
138 if (o == NULL)
139 break;
140 if (*o == '\0')
141 continue;
142
143 token = match_token(o, tokens, tmp);
144 switch (token) {
145 case Opt_lockproto:
146 match_strlcpy(args->ar_lockproto, &tmp[0],
147 GFS2_LOCKNAME_LEN);
148 break;
149 case Opt_locktable:
150 match_strlcpy(args->ar_locktable, &tmp[0],
151 GFS2_LOCKNAME_LEN);
152 break;
153 case Opt_hostdata:
154 match_strlcpy(args->ar_hostdata, &tmp[0],
155 GFS2_LOCKNAME_LEN);
156 break;
157 case Opt_spectator:
158 args->ar_spectator = 1;
159 break;
160 case Opt_ignore_local_fs:
161 args->ar_ignore_local_fs = 1;
162 break;
163 case Opt_localflocks:
164 args->ar_localflocks = 1;
165 break;
166 case Opt_localcaching:
167 args->ar_localcaching = 1;
168 break;
169 case Opt_debug:
170 if (args->ar_errors == GFS2_ERRORS_PANIC) {
171 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
172 "are mutually exclusive.\n");
173 return -EINVAL;
174 }
175 args->ar_debug = 1;
176 break;
177 case Opt_nodebug:
178 args->ar_debug = 0;
179 break;
180 case Opt_upgrade:
181 args->ar_upgrade = 1;
182 break;
183 case Opt_acl:
184 args->ar_posix_acl = 1;
185 break;
186 case Opt_noacl:
187 args->ar_posix_acl = 0;
188 break;
189 case Opt_quota_off:
190 case Opt_noquota:
191 args->ar_quota = GFS2_QUOTA_OFF;
192 break;
193 case Opt_quota_account:
194 args->ar_quota = GFS2_QUOTA_ACCOUNT;
195 break;
196 case Opt_quota_on:
197 case Opt_quota:
198 args->ar_quota = GFS2_QUOTA_ON;
199 break;
200 case Opt_suiddir:
201 args->ar_suiddir = 1;
202 break;
203 case Opt_nosuiddir:
204 args->ar_suiddir = 0;
205 break;
206 case Opt_data_writeback:
207 args->ar_data = GFS2_DATA_WRITEBACK;
208 break;
209 case Opt_data_ordered:
210 args->ar_data = GFS2_DATA_ORDERED;
211 break;
212 case Opt_meta:
213 args->ar_meta = 1;
214 break;
215 case Opt_discard:
216 args->ar_discard = 1;
217 break;
218 case Opt_nodiscard:
219 args->ar_discard = 0;
220 break;
221 case Opt_commit:
222 rv = match_int(&tmp[0], &args->ar_commit);
223 if (rv || args->ar_commit <= 0) {
224 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
225 return rv ? rv : -EINVAL;
226 }
227 break;
228 case Opt_statfs_quantum:
229 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
230 if (rv || args->ar_statfs_quantum < 0) {
231 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
232 return rv ? rv : -EINVAL;
233 }
234 break;
235 case Opt_quota_quantum:
236 rv = match_int(&tmp[0], &args->ar_quota_quantum);
237 if (rv || args->ar_quota_quantum <= 0) {
238 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
239 return rv ? rv : -EINVAL;
240 }
241 break;
242 case Opt_statfs_percent:
243 rv = match_int(&tmp[0], &args->ar_statfs_percent);
244 if (rv || args->ar_statfs_percent < 0 ||
245 args->ar_statfs_percent > 100) {
246 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
247 return rv ? rv : -EINVAL;
248 }
249 break;
250 case Opt_err_withdraw:
251 args->ar_errors = GFS2_ERRORS_WITHDRAW;
252 break;
253 case Opt_err_panic:
254 if (args->ar_debug) {
255 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
256 "are mutually exclusive.\n");
257 return -EINVAL;
258 }
259 args->ar_errors = GFS2_ERRORS_PANIC;
260 break;
261 case Opt_barrier:
262 args->ar_nobarrier = 0;
263 break;
264 case Opt_nobarrier:
265 args->ar_nobarrier = 1;
266 break;
267 case Opt_error:
268 default:
269 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
270 return -EINVAL;
271 }
272 }
273
274 return 0;
275 }
276
277 /**
278 * gfs2_jindex_free - Clear all the journal index information
279 * @sdp: The GFS2 superblock
280 *
281 */
282
283 void gfs2_jindex_free(struct gfs2_sbd *sdp)
284 {
285 struct list_head list, *head;
286 struct gfs2_jdesc *jd;
287 struct gfs2_journal_extent *jext;
288
289 spin_lock(&sdp->sd_jindex_spin);
290 list_add(&list, &sdp->sd_jindex_list);
291 list_del_init(&sdp->sd_jindex_list);
292 sdp->sd_journals = 0;
293 spin_unlock(&sdp->sd_jindex_spin);
294
295 while (!list_empty(&list)) {
296 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
297 head = &jd->extent_list;
298 while (!list_empty(head)) {
299 jext = list_entry(head->next,
300 struct gfs2_journal_extent,
301 extent_list);
302 list_del(&jext->extent_list);
303 kfree(jext);
304 }
305 list_del(&jd->jd_list);
306 iput(jd->jd_inode);
307 kfree(jd);
308 }
309 }
310
311 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
312 {
313 struct gfs2_jdesc *jd;
314 int found = 0;
315
316 list_for_each_entry(jd, head, jd_list) {
317 if (jd->jd_jid == jid) {
318 found = 1;
319 break;
320 }
321 }
322
323 if (!found)
324 jd = NULL;
325
326 return jd;
327 }
328
329 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
330 {
331 struct gfs2_jdesc *jd;
332
333 spin_lock(&sdp->sd_jindex_spin);
334 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
335 spin_unlock(&sdp->sd_jindex_spin);
336
337 return jd;
338 }
339
340 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
341 {
342 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
343 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
344 int ar;
345 int error;
346
347 if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
348 (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
349 gfs2_consist_inode(ip);
350 return -EIO;
351 }
352 jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
353
354 error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
355 if (!error && ar) {
356 gfs2_consist_inode(ip);
357 error = -EIO;
358 }
359
360 return error;
361 }
362
363 /**
364 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
365 * @sdp: the filesystem
366 *
367 * Returns: errno
368 */
369
370 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
371 {
372 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
373 struct gfs2_glock *j_gl = ip->i_gl;
374 struct gfs2_holder t_gh;
375 struct gfs2_log_header_host head;
376 int error;
377
378 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
379 if (error)
380 return error;
381
382 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
383
384 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
385 if (error)
386 goto fail;
387
388 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
389 gfs2_consist(sdp);
390 error = -EIO;
391 goto fail;
392 }
393
394 /* Initialize some head of the log stuff */
395 sdp->sd_log_sequence = head.lh_sequence + 1;
396 gfs2_log_pointers_init(sdp, head.lh_blkno);
397
398 error = gfs2_quota_init(sdp);
399 if (error)
400 goto fail;
401
402 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
403
404 gfs2_glock_dq_uninit(&t_gh);
405
406 return 0;
407
408 fail:
409 t_gh.gh_flags |= GL_NOCACHE;
410 gfs2_glock_dq_uninit(&t_gh);
411
412 return error;
413 }
414
415 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
416 {
417 const struct gfs2_statfs_change *str = buf;
418
419 sc->sc_total = be64_to_cpu(str->sc_total);
420 sc->sc_free = be64_to_cpu(str->sc_free);
421 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
422 }
423
424 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
425 {
426 struct gfs2_statfs_change *str = buf;
427
428 str->sc_total = cpu_to_be64(sc->sc_total);
429 str->sc_free = cpu_to_be64(sc->sc_free);
430 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
431 }
432
433 int gfs2_statfs_init(struct gfs2_sbd *sdp)
434 {
435 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
436 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
437 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
438 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
439 struct buffer_head *m_bh, *l_bh;
440 struct gfs2_holder gh;
441 int error;
442
443 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
444 &gh);
445 if (error)
446 return error;
447
448 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
449 if (error)
450 goto out;
451
452 if (sdp->sd_args.ar_spectator) {
453 spin_lock(&sdp->sd_statfs_spin);
454 gfs2_statfs_change_in(m_sc, m_bh->b_data +
455 sizeof(struct gfs2_dinode));
456 spin_unlock(&sdp->sd_statfs_spin);
457 } else {
458 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
459 if (error)
460 goto out_m_bh;
461
462 spin_lock(&sdp->sd_statfs_spin);
463 gfs2_statfs_change_in(m_sc, m_bh->b_data +
464 sizeof(struct gfs2_dinode));
465 gfs2_statfs_change_in(l_sc, l_bh->b_data +
466 sizeof(struct gfs2_dinode));
467 spin_unlock(&sdp->sd_statfs_spin);
468
469 brelse(l_bh);
470 }
471
472 out_m_bh:
473 brelse(m_bh);
474 out:
475 gfs2_glock_dq_uninit(&gh);
476 return 0;
477 }
478
479 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
480 s64 dinodes)
481 {
482 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
483 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
484 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
485 struct buffer_head *l_bh;
486 s64 x, y;
487 int need_sync = 0;
488 int error;
489
490 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
491 if (error)
492 return;
493
494 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
495
496 spin_lock(&sdp->sd_statfs_spin);
497 l_sc->sc_total += total;
498 l_sc->sc_free += free;
499 l_sc->sc_dinodes += dinodes;
500 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
501 if (sdp->sd_args.ar_statfs_percent) {
502 x = 100 * l_sc->sc_free;
503 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
504 if (x >= y || x <= -y)
505 need_sync = 1;
506 }
507 spin_unlock(&sdp->sd_statfs_spin);
508
509 brelse(l_bh);
510 if (need_sync)
511 gfs2_wake_up_statfs(sdp);
512 }
513
514 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
515 struct buffer_head *l_bh)
516 {
517 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
518 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
519 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
520 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
521
522 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
523
524 spin_lock(&sdp->sd_statfs_spin);
525 m_sc->sc_total += l_sc->sc_total;
526 m_sc->sc_free += l_sc->sc_free;
527 m_sc->sc_dinodes += l_sc->sc_dinodes;
528 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
529 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
530 0, sizeof(struct gfs2_statfs_change));
531 spin_unlock(&sdp->sd_statfs_spin);
532
533 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
534 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
535 }
536
537 int gfs2_statfs_sync(struct super_block *sb, int type)
538 {
539 struct gfs2_sbd *sdp = sb->s_fs_info;
540 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
541 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
542 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
543 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
544 struct gfs2_holder gh;
545 struct buffer_head *m_bh, *l_bh;
546 int error;
547
548 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
549 &gh);
550 if (error)
551 return error;
552
553 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
554 if (error)
555 goto out;
556
557 spin_lock(&sdp->sd_statfs_spin);
558 gfs2_statfs_change_in(m_sc, m_bh->b_data +
559 sizeof(struct gfs2_dinode));
560 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
561 spin_unlock(&sdp->sd_statfs_spin);
562 goto out_bh;
563 }
564 spin_unlock(&sdp->sd_statfs_spin);
565
566 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
567 if (error)
568 goto out_bh;
569
570 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
571 if (error)
572 goto out_bh2;
573
574 update_statfs(sdp, m_bh, l_bh);
575 sdp->sd_statfs_force_sync = 0;
576
577 gfs2_trans_end(sdp);
578
579 out_bh2:
580 brelse(l_bh);
581 out_bh:
582 brelse(m_bh);
583 out:
584 gfs2_glock_dq_uninit(&gh);
585 return error;
586 }
587
588 struct lfcc {
589 struct list_head list;
590 struct gfs2_holder gh;
591 };
592
593 /**
594 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
595 * journals are clean
596 * @sdp: the file system
597 * @state: the state to put the transaction lock into
598 * @t_gh: the hold on the transaction lock
599 *
600 * Returns: errno
601 */
602
603 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
604 struct gfs2_holder *t_gh)
605 {
606 struct gfs2_inode *ip;
607 struct gfs2_jdesc *jd;
608 struct lfcc *lfcc;
609 LIST_HEAD(list);
610 struct gfs2_log_header_host lh;
611 int error;
612
613 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
614 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
615 if (!lfcc) {
616 error = -ENOMEM;
617 goto out;
618 }
619 ip = GFS2_I(jd->jd_inode);
620 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
621 if (error) {
622 kfree(lfcc);
623 goto out;
624 }
625 list_add(&lfcc->list, &list);
626 }
627
628 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
629 GL_NOCACHE, t_gh);
630
631 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
632 error = gfs2_jdesc_check(jd);
633 if (error)
634 break;
635 error = gfs2_find_jhead(jd, &lh);
636 if (error)
637 break;
638 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
639 error = -EBUSY;
640 break;
641 }
642 }
643
644 if (error)
645 gfs2_glock_dq_uninit(t_gh);
646
647 out:
648 while (!list_empty(&list)) {
649 lfcc = list_entry(list.next, struct lfcc, list);
650 list_del(&lfcc->list);
651 gfs2_glock_dq_uninit(&lfcc->gh);
652 kfree(lfcc);
653 }
654 return error;
655 }
656
657 /**
658 * gfs2_freeze_fs - freezes the file system
659 * @sdp: the file system
660 *
661 * This function flushes data and meta data for all machines by
662 * aquiring the transaction log exclusively. All journals are
663 * ensured to be in a clean state as well.
664 *
665 * Returns: errno
666 */
667
668 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
669 {
670 int error = 0;
671
672 mutex_lock(&sdp->sd_freeze_lock);
673
674 if (!sdp->sd_freeze_count++) {
675 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
676 if (error)
677 sdp->sd_freeze_count--;
678 }
679
680 mutex_unlock(&sdp->sd_freeze_lock);
681
682 return error;
683 }
684
685 /**
686 * gfs2_unfreeze_fs - unfreezes the file system
687 * @sdp: the file system
688 *
689 * This function allows the file system to proceed by unlocking
690 * the exclusively held transaction lock. Other GFS2 nodes are
691 * now free to acquire the lock shared and go on with their lives.
692 *
693 */
694
695 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
696 {
697 mutex_lock(&sdp->sd_freeze_lock);
698
699 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
700 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
701
702 mutex_unlock(&sdp->sd_freeze_lock);
703 }
704
705
706 /**
707 * gfs2_write_inode - Make sure the inode is stable on the disk
708 * @inode: The inode
709 * @sync: synchronous write flag
710 *
711 * Returns: errno
712 */
713
714 static int gfs2_write_inode(struct inode *inode, int sync)
715 {
716 struct gfs2_inode *ip = GFS2_I(inode);
717 struct gfs2_sbd *sdp = GFS2_SB(inode);
718 struct gfs2_holder gh;
719 struct buffer_head *bh;
720 struct timespec atime;
721 struct gfs2_dinode *di;
722 int ret = 0;
723
724 /* Check this is a "normal" inode, etc */
725 if (!test_bit(GIF_USER, &ip->i_flags) ||
726 (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 (sync != 0)
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);
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 gfs2_gl_hash_clear(sdp);
864 /* Unmount the locking protocol */
865 gfs2_lm_unmount(sdp);
866
867 /* At this point, we're through participating in the lockspace */
868 gfs2_sys_fs_del(sdp);
869 }
870
871 /**
872 * gfs2_sync_fs - sync the filesystem
873 * @sb: the superblock
874 *
875 * Flushes the log to disk.
876 */
877
878 static int gfs2_sync_fs(struct super_block *sb, int wait)
879 {
880 if (wait && sb->s_fs_info)
881 gfs2_log_flush(sb->s_fs_info, NULL);
882 return 0;
883 }
884
885 /**
886 * gfs2_freeze - prevent further writes to the filesystem
887 * @sb: the VFS structure for the filesystem
888 *
889 */
890
891 static int gfs2_freeze(struct super_block *sb)
892 {
893 struct gfs2_sbd *sdp = sb->s_fs_info;
894 int error;
895
896 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
897 return -EINVAL;
898
899 for (;;) {
900 error = gfs2_freeze_fs(sdp);
901 if (!error)
902 break;
903
904 switch (error) {
905 case -EBUSY:
906 fs_err(sdp, "waiting for recovery before freeze\n");
907 break;
908
909 default:
910 fs_err(sdp, "error freezing FS: %d\n", error);
911 break;
912 }
913
914 fs_err(sdp, "retrying...\n");
915 msleep(1000);
916 }
917 return 0;
918 }
919
920 /**
921 * gfs2_unfreeze - reallow writes to the filesystem
922 * @sb: the VFS structure for the filesystem
923 *
924 */
925
926 static int gfs2_unfreeze(struct super_block *sb)
927 {
928 gfs2_unfreeze_fs(sb->s_fs_info);
929 return 0;
930 }
931
932 /**
933 * statfs_fill - fill in the sg for a given RG
934 * @rgd: the RG
935 * @sc: the sc structure
936 *
937 * Returns: 0 on success, -ESTALE if the LVB is invalid
938 */
939
940 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
941 struct gfs2_statfs_change_host *sc)
942 {
943 gfs2_rgrp_verify(rgd);
944 sc->sc_total += rgd->rd_data;
945 sc->sc_free += rgd->rd_free;
946 sc->sc_dinodes += rgd->rd_dinodes;
947 return 0;
948 }
949
950 /**
951 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
952 * @sdp: the filesystem
953 * @sc: the sc info that will be returned
954 *
955 * Any error (other than a signal) will cause this routine to fall back
956 * to the synchronous version.
957 *
958 * FIXME: This really shouldn't busy wait like this.
959 *
960 * Returns: errno
961 */
962
963 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
964 {
965 struct gfs2_holder ri_gh;
966 struct gfs2_rgrpd *rgd_next;
967 struct gfs2_holder *gha, *gh;
968 unsigned int slots = 64;
969 unsigned int x;
970 int done;
971 int error = 0, err;
972
973 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
974 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
975 if (!gha)
976 return -ENOMEM;
977
978 error = gfs2_rindex_hold(sdp, &ri_gh);
979 if (error)
980 goto out;
981
982 rgd_next = gfs2_rgrpd_get_first(sdp);
983
984 for (;;) {
985 done = 1;
986
987 for (x = 0; x < slots; x++) {
988 gh = gha + x;
989
990 if (gh->gh_gl && gfs2_glock_poll(gh)) {
991 err = gfs2_glock_wait(gh);
992 if (err) {
993 gfs2_holder_uninit(gh);
994 error = err;
995 } else {
996 if (!error)
997 error = statfs_slow_fill(
998 gh->gh_gl->gl_object, sc);
999 gfs2_glock_dq_uninit(gh);
1000 }
1001 }
1002
1003 if (gh->gh_gl)
1004 done = 0;
1005 else if (rgd_next && !error) {
1006 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1007 LM_ST_SHARED,
1008 GL_ASYNC,
1009 gh);
1010 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1011 done = 0;
1012 }
1013
1014 if (signal_pending(current))
1015 error = -ERESTARTSYS;
1016 }
1017
1018 if (done)
1019 break;
1020
1021 yield();
1022 }
1023
1024 gfs2_glock_dq_uninit(&ri_gh);
1025
1026 out:
1027 kfree(gha);
1028 return error;
1029 }
1030
1031 /**
1032 * gfs2_statfs_i - Do a statfs
1033 * @sdp: the filesystem
1034 * @sg: the sg structure
1035 *
1036 * Returns: errno
1037 */
1038
1039 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1040 {
1041 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1042 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1043
1044 spin_lock(&sdp->sd_statfs_spin);
1045
1046 *sc = *m_sc;
1047 sc->sc_total += l_sc->sc_total;
1048 sc->sc_free += l_sc->sc_free;
1049 sc->sc_dinodes += l_sc->sc_dinodes;
1050
1051 spin_unlock(&sdp->sd_statfs_spin);
1052
1053 if (sc->sc_free < 0)
1054 sc->sc_free = 0;
1055 if (sc->sc_free > sc->sc_total)
1056 sc->sc_free = sc->sc_total;
1057 if (sc->sc_dinodes < 0)
1058 sc->sc_dinodes = 0;
1059
1060 return 0;
1061 }
1062
1063 /**
1064 * gfs2_statfs - Gather and return stats about the filesystem
1065 * @sb: The superblock
1066 * @statfsbuf: The buffer
1067 *
1068 * Returns: 0 on success or error code
1069 */
1070
1071 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1072 {
1073 struct super_block *sb = dentry->d_inode->i_sb;
1074 struct gfs2_sbd *sdp = sb->s_fs_info;
1075 struct gfs2_statfs_change_host sc;
1076 int error;
1077
1078 if (gfs2_tune_get(sdp, gt_statfs_slow))
1079 error = gfs2_statfs_slow(sdp, &sc);
1080 else
1081 error = gfs2_statfs_i(sdp, &sc);
1082
1083 if (error)
1084 return error;
1085
1086 buf->f_type = GFS2_MAGIC;
1087 buf->f_bsize = sdp->sd_sb.sb_bsize;
1088 buf->f_blocks = sc.sc_total;
1089 buf->f_bfree = sc.sc_free;
1090 buf->f_bavail = sc.sc_free;
1091 buf->f_files = sc.sc_dinodes + sc.sc_free;
1092 buf->f_ffree = sc.sc_free;
1093 buf->f_namelen = GFS2_FNAMESIZE;
1094
1095 return 0;
1096 }
1097
1098 /**
1099 * gfs2_remount_fs - called when the FS is remounted
1100 * @sb: the filesystem
1101 * @flags: the remount flags
1102 * @data: extra data passed in (not used right now)
1103 *
1104 * Returns: errno
1105 */
1106
1107 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1108 {
1109 struct gfs2_sbd *sdp = sb->s_fs_info;
1110 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1111 struct gfs2_tune *gt = &sdp->sd_tune;
1112 int error;
1113
1114 spin_lock(&gt->gt_spin);
1115 args.ar_commit = gt->gt_log_flush_secs;
1116 args.ar_quota_quantum = gt->gt_quota_quantum;
1117 if (gt->gt_statfs_slow)
1118 args.ar_statfs_quantum = 0;
1119 else
1120 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1121 spin_unlock(&gt->gt_spin);
1122 error = gfs2_mount_args(&args, data);
1123 if (error)
1124 return error;
1125
1126 /* Not allowed to change locking details */
1127 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1128 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1129 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1130 return -EINVAL;
1131
1132 /* Some flags must not be changed */
1133 if (args_neq(&args, &sdp->sd_args, spectator) ||
1134 args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1135 args_neq(&args, &sdp->sd_args, localflocks) ||
1136 args_neq(&args, &sdp->sd_args, localcaching) ||
1137 args_neq(&args, &sdp->sd_args, meta))
1138 return -EINVAL;
1139
1140 if (sdp->sd_args.ar_spectator)
1141 *flags |= MS_RDONLY;
1142
1143 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1144 if (*flags & MS_RDONLY)
1145 error = gfs2_make_fs_ro(sdp);
1146 else
1147 error = gfs2_make_fs_rw(sdp);
1148 if (error)
1149 return error;
1150 }
1151
1152 sdp->sd_args = args;
1153 if (sdp->sd_args.ar_posix_acl)
1154 sb->s_flags |= MS_POSIXACL;
1155 else
1156 sb->s_flags &= ~MS_POSIXACL;
1157 if (sdp->sd_args.ar_nobarrier)
1158 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1159 else
1160 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161 spin_lock(&gt->gt_spin);
1162 gt->gt_log_flush_secs = args.ar_commit;
1163 gt->gt_quota_quantum = args.ar_quota_quantum;
1164 if (args.ar_statfs_quantum) {
1165 gt->gt_statfs_slow = 0;
1166 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1167 }
1168 else {
1169 gt->gt_statfs_slow = 1;
1170 gt->gt_statfs_quantum = 30;
1171 }
1172 spin_unlock(&gt->gt_spin);
1173
1174 gfs2_online_uevent(sdp);
1175 return 0;
1176 }
1177
1178 /**
1179 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1180 * @inode: The inode to drop
1181 *
1182 * If we've received a callback on an iopen lock then its because a
1183 * remote node tried to deallocate the inode but failed due to this node
1184 * still having the inode open. Here we mark the link count zero
1185 * since we know that it must have reached zero if the GLF_DEMOTE flag
1186 * is set on the iopen glock. If we didn't do a disk read since the
1187 * remote node removed the final link then we might otherwise miss
1188 * this event. This check ensures that this node will deallocate the
1189 * inode's blocks, or alternatively pass the baton on to another
1190 * node for later deallocation.
1191 */
1192
1193 static void gfs2_drop_inode(struct inode *inode)
1194 {
1195 struct gfs2_inode *ip = GFS2_I(inode);
1196
1197 if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1198 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1199 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1200 clear_nlink(inode);
1201 }
1202 generic_drop_inode(inode);
1203 }
1204
1205 /**
1206 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1207 * @inode: The VFS inode
1208 *
1209 */
1210
1211 static void gfs2_clear_inode(struct inode *inode)
1212 {
1213 struct gfs2_inode *ip = GFS2_I(inode);
1214
1215 /* This tells us its a "real" inode and not one which only
1216 * serves to contain an address space (see rgrp.c, meta_io.c)
1217 * which therefore doesn't have its own glocks.
1218 */
1219 if (test_bit(GIF_USER, &ip->i_flags)) {
1220 ip->i_gl->gl_object = NULL;
1221 gfs2_glock_put(ip->i_gl);
1222 ip->i_gl = NULL;
1223 if (ip->i_iopen_gh.gh_gl) {
1224 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1225 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1226 }
1227 }
1228 }
1229
1230 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1231 {
1232 do {
1233 if (d1 == d2)
1234 return 1;
1235 d1 = d1->d_parent;
1236 } while (!IS_ROOT(d1));
1237 return 0;
1238 }
1239
1240 /**
1241 * gfs2_show_options - Show mount options for /proc/mounts
1242 * @s: seq_file structure
1243 * @mnt: vfsmount
1244 *
1245 * Returns: 0 on success or error code
1246 */
1247
1248 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1249 {
1250 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1251 struct gfs2_args *args = &sdp->sd_args;
1252 int val;
1253
1254 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1255 seq_printf(s, ",meta");
1256 if (args->ar_lockproto[0])
1257 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1258 if (args->ar_locktable[0])
1259 seq_printf(s, ",locktable=%s", args->ar_locktable);
1260 if (args->ar_hostdata[0])
1261 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1262 if (args->ar_spectator)
1263 seq_printf(s, ",spectator");
1264 if (args->ar_ignore_local_fs)
1265 seq_printf(s, ",ignore_local_fs");
1266 if (args->ar_localflocks)
1267 seq_printf(s, ",localflocks");
1268 if (args->ar_localcaching)
1269 seq_printf(s, ",localcaching");
1270 if (args->ar_debug)
1271 seq_printf(s, ",debug");
1272 if (args->ar_upgrade)
1273 seq_printf(s, ",upgrade");
1274 if (args->ar_posix_acl)
1275 seq_printf(s, ",acl");
1276 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1277 char *state;
1278 switch (args->ar_quota) {
1279 case GFS2_QUOTA_OFF:
1280 state = "off";
1281 break;
1282 case GFS2_QUOTA_ACCOUNT:
1283 state = "account";
1284 break;
1285 case GFS2_QUOTA_ON:
1286 state = "on";
1287 break;
1288 default:
1289 state = "unknown";
1290 break;
1291 }
1292 seq_printf(s, ",quota=%s", state);
1293 }
1294 if (args->ar_suiddir)
1295 seq_printf(s, ",suiddir");
1296 if (args->ar_data != GFS2_DATA_DEFAULT) {
1297 char *state;
1298 switch (args->ar_data) {
1299 case GFS2_DATA_WRITEBACK:
1300 state = "writeback";
1301 break;
1302 case GFS2_DATA_ORDERED:
1303 state = "ordered";
1304 break;
1305 default:
1306 state = "unknown";
1307 break;
1308 }
1309 seq_printf(s, ",data=%s", state);
1310 }
1311 if (args->ar_discard)
1312 seq_printf(s, ",discard");
1313 val = sdp->sd_tune.gt_log_flush_secs;
1314 if (val != 60)
1315 seq_printf(s, ",commit=%d", val);
1316 val = sdp->sd_tune.gt_statfs_quantum;
1317 if (val != 30)
1318 seq_printf(s, ",statfs_quantum=%d", val);
1319 val = sdp->sd_tune.gt_quota_quantum;
1320 if (val != 60)
1321 seq_printf(s, ",quota_quantum=%d", val);
1322 if (args->ar_statfs_percent)
1323 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1324 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1325 const char *state;
1326
1327 switch (args->ar_errors) {
1328 case GFS2_ERRORS_WITHDRAW:
1329 state = "withdraw";
1330 break;
1331 case GFS2_ERRORS_PANIC:
1332 state = "panic";
1333 break;
1334 default:
1335 state = "unknown";
1336 break;
1337 }
1338 seq_printf(s, ",errors=%s", state);
1339 }
1340 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1341 seq_printf(s, ",nobarrier");
1342
1343 return 0;
1344 }
1345
1346 /*
1347 * We have to (at the moment) hold the inodes main lock to cover
1348 * the gap between unlocking the shared lock on the iopen lock and
1349 * taking the exclusive lock. I'd rather do a shared -> exclusive
1350 * conversion on the iopen lock, but we can change that later. This
1351 * is safe, just less efficient.
1352 */
1353
1354 static void gfs2_delete_inode(struct inode *inode)
1355 {
1356 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1357 struct gfs2_inode *ip = GFS2_I(inode);
1358 struct gfs2_holder gh;
1359 int error;
1360
1361 if (!test_bit(GIF_USER, &ip->i_flags))
1362 goto out;
1363
1364 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1365 if (unlikely(error)) {
1366 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1367 goto out;
1368 }
1369
1370 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1371 if (error)
1372 goto out_truncate;
1373
1374 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1375 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1376 error = gfs2_glock_nq(&ip->i_iopen_gh);
1377 if (error)
1378 goto out_truncate;
1379
1380 if (S_ISDIR(inode->i_mode) &&
1381 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1382 error = gfs2_dir_exhash_dealloc(ip);
1383 if (error)
1384 goto out_unlock;
1385 }
1386
1387 if (ip->i_eattr) {
1388 error = gfs2_ea_dealloc(ip);
1389 if (error)
1390 goto out_unlock;
1391 }
1392
1393 if (!gfs2_is_stuffed(ip)) {
1394 error = gfs2_file_dealloc(ip);
1395 if (error)
1396 goto out_unlock;
1397 }
1398
1399 error = gfs2_dinode_dealloc(ip);
1400 if (error)
1401 goto out_unlock;
1402
1403 out_truncate:
1404 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1405 if (error)
1406 goto out_unlock;
1407 /* Needs to be done before glock release & also in a transaction */
1408 truncate_inode_pages(&inode->i_data, 0);
1409 gfs2_trans_end(sdp);
1410
1411 out_unlock:
1412 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1413 gfs2_glock_dq(&ip->i_iopen_gh);
1414 gfs2_holder_uninit(&ip->i_iopen_gh);
1415 gfs2_glock_dq_uninit(&gh);
1416 if (error && error != GLR_TRYFAILED && error != -EROFS)
1417 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1418 out:
1419 truncate_inode_pages(&inode->i_data, 0);
1420 clear_inode(inode);
1421 }
1422
1423 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1424 {
1425 struct gfs2_inode *ip;
1426
1427 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1428 if (ip) {
1429 ip->i_flags = 0;
1430 ip->i_gl = NULL;
1431 }
1432 return &ip->i_inode;
1433 }
1434
1435 static void gfs2_destroy_inode(struct inode *inode)
1436 {
1437 kmem_cache_free(gfs2_inode_cachep, inode);
1438 }
1439
1440 const struct super_operations gfs2_super_ops = {
1441 .alloc_inode = gfs2_alloc_inode,
1442 .destroy_inode = gfs2_destroy_inode,
1443 .write_inode = gfs2_write_inode,
1444 .delete_inode = gfs2_delete_inode,
1445 .put_super = gfs2_put_super,
1446 .sync_fs = gfs2_sync_fs,
1447 .freeze_fs = gfs2_freeze,
1448 .unfreeze_fs = gfs2_unfreeze,
1449 .statfs = gfs2_statfs,
1450 .remount_fs = gfs2_remount_fs,
1451 .clear_inode = gfs2_clear_inode,
1452 .drop_inode = gfs2_drop_inode,
1453 .show_options = gfs2_show_options,
1454 };
1455