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ARM: clps711x: Remove the special name for the syscon driver
[linux-2.6.git] / fs / gfs2 / super.c
blobe5639dec66c49dc7361ff0ed79828301031b675d
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 #include <linux/backing-dev.h>
27
28 #include "gfs2.h"
29 #include "incore.h"
30 #include "bmap.h"
31 #include "dir.h"
32 #include "glock.h"
33 #include "glops.h"
34 #include "inode.h"
35 #include "log.h"
36 #include "meta_io.h"
37 #include "quota.h"
38 #include "recovery.h"
39 #include "rgrp.h"
40 #include "super.h"
41 #include "trans.h"
42 #include "util.h"
43 #include "sys.h"
44 #include "xattr.h"
45
46 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
47
48 enum {
49 Opt_lockproto,
50 Opt_locktable,
51 Opt_hostdata,
52 Opt_spectator,
53 Opt_ignore_local_fs,
54 Opt_localflocks,
55 Opt_localcaching,
56 Opt_debug,
57 Opt_nodebug,
58 Opt_upgrade,
59 Opt_acl,
60 Opt_noacl,
61 Opt_quota_off,
62 Opt_quota_account,
63 Opt_quota_on,
64 Opt_quota,
65 Opt_noquota,
66 Opt_suiddir,
67 Opt_nosuiddir,
68 Opt_data_writeback,
69 Opt_data_ordered,
70 Opt_meta,
71 Opt_discard,
72 Opt_nodiscard,
73 Opt_commit,
74 Opt_err_withdraw,
75 Opt_err_panic,
76 Opt_statfs_quantum,
77 Opt_statfs_percent,
78 Opt_quota_quantum,
79 Opt_barrier,
80 Opt_nobarrier,
81 Opt_rgrplvb,
82 Opt_norgrplvb,
83 Opt_error,
84 };
85
86 static const match_table_t tokens = {
87 {Opt_lockproto, "lockproto=%s"},
88 {Opt_locktable, "locktable=%s"},
89 {Opt_hostdata, "hostdata=%s"},
90 {Opt_spectator, "spectator"},
91 {Opt_spectator, "norecovery"},
92 {Opt_ignore_local_fs, "ignore_local_fs"},
93 {Opt_localflocks, "localflocks"},
94 {Opt_localcaching, "localcaching"},
95 {Opt_debug, "debug"},
96 {Opt_nodebug, "nodebug"},
97 {Opt_upgrade, "upgrade"},
98 {Opt_acl, "acl"},
99 {Opt_noacl, "noacl"},
100 {Opt_quota_off, "quota=off"},
101 {Opt_quota_account, "quota=account"},
102 {Opt_quota_on, "quota=on"},
103 {Opt_quota, "quota"},
104 {Opt_noquota, "noquota"},
105 {Opt_suiddir, "suiddir"},
106 {Opt_nosuiddir, "nosuiddir"},
107 {Opt_data_writeback, "data=writeback"},
108 {Opt_data_ordered, "data=ordered"},
109 {Opt_meta, "meta"},
110 {Opt_discard, "discard"},
111 {Opt_nodiscard, "nodiscard"},
112 {Opt_commit, "commit=%d"},
113 {Opt_err_withdraw, "errors=withdraw"},
114 {Opt_err_panic, "errors=panic"},
115 {Opt_statfs_quantum, "statfs_quantum=%d"},
116 {Opt_statfs_percent, "statfs_percent=%d"},
117 {Opt_quota_quantum, "quota_quantum=%d"},
118 {Opt_barrier, "barrier"},
119 {Opt_nobarrier, "nobarrier"},
120 {Opt_rgrplvb, "rgrplvb"},
121 {Opt_norgrplvb, "norgrplvb"},
122 {Opt_error, NULL}
123 };
124
125 /**
126 * gfs2_mount_args - Parse mount options
127 * @args: The structure into which the parsed options will be written
128 * @options: The options to parse
129 *
130 * Return: errno
131 */
132
133 int gfs2_mount_args(struct gfs2_args *args, char *options)
134 {
135 char *o;
136 int token;
137 substring_t tmp[MAX_OPT_ARGS];
138 int rv;
139
140 /* Split the options into tokens with the "," character and
141 process them */
142
143 while (1) {
144 o = strsep(&options, ",");
145 if (o == NULL)
146 break;
147 if (*o == '\0')
148 continue;
149
150 token = match_token(o, tokens, tmp);
151 switch (token) {
152 case Opt_lockproto:
153 match_strlcpy(args->ar_lockproto, &tmp[0],
154 GFS2_LOCKNAME_LEN);
155 break;
156 case Opt_locktable:
157 match_strlcpy(args->ar_locktable, &tmp[0],
158 GFS2_LOCKNAME_LEN);
159 break;
160 case Opt_hostdata:
161 match_strlcpy(args->ar_hostdata, &tmp[0],
162 GFS2_LOCKNAME_LEN);
163 break;
164 case Opt_spectator:
165 args->ar_spectator = 1;
166 break;
167 case Opt_ignore_local_fs:
168 /* Retained for backwards compat only */
169 break;
170 case Opt_localflocks:
171 args->ar_localflocks = 1;
172 break;
173 case Opt_localcaching:
174 /* Retained for backwards compat only */
175 break;
176 case Opt_debug:
177 if (args->ar_errors == GFS2_ERRORS_PANIC) {
178 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
179 "are mutually exclusive.\n");
180 return -EINVAL;
181 }
182 args->ar_debug = 1;
183 break;
184 case Opt_nodebug:
185 args->ar_debug = 0;
186 break;
187 case Opt_upgrade:
188 /* Retained for backwards compat only */
189 break;
190 case Opt_acl:
191 args->ar_posix_acl = 1;
192 break;
193 case Opt_noacl:
194 args->ar_posix_acl = 0;
195 break;
196 case Opt_quota_off:
197 case Opt_noquota:
198 args->ar_quota = GFS2_QUOTA_OFF;
199 break;
200 case Opt_quota_account:
201 args->ar_quota = GFS2_QUOTA_ACCOUNT;
202 break;
203 case Opt_quota_on:
204 case Opt_quota:
205 args->ar_quota = GFS2_QUOTA_ON;
206 break;
207 case Opt_suiddir:
208 args->ar_suiddir = 1;
209 break;
210 case Opt_nosuiddir:
211 args->ar_suiddir = 0;
212 break;
213 case Opt_data_writeback:
214 args->ar_data = GFS2_DATA_WRITEBACK;
215 break;
216 case Opt_data_ordered:
217 args->ar_data = GFS2_DATA_ORDERED;
218 break;
219 case Opt_meta:
220 args->ar_meta = 1;
221 break;
222 case Opt_discard:
223 args->ar_discard = 1;
224 break;
225 case Opt_nodiscard:
226 args->ar_discard = 0;
227 break;
228 case Opt_commit:
229 rv = match_int(&tmp[0], &args->ar_commit);
230 if (rv || args->ar_commit <= 0) {
231 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
232 return rv ? rv : -EINVAL;
233 }
234 break;
235 case Opt_statfs_quantum:
236 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
237 if (rv || args->ar_statfs_quantum < 0) {
238 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
239 return rv ? rv : -EINVAL;
240 }
241 break;
242 case Opt_quota_quantum:
243 rv = match_int(&tmp[0], &args->ar_quota_quantum);
244 if (rv || args->ar_quota_quantum <= 0) {
245 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
246 return rv ? rv : -EINVAL;
247 }
248 break;
249 case Opt_statfs_percent:
250 rv = match_int(&tmp[0], &args->ar_statfs_percent);
251 if (rv || args->ar_statfs_percent < 0 ||
252 args->ar_statfs_percent > 100) {
253 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
254 return rv ? rv : -EINVAL;
255 }
256 break;
257 case Opt_err_withdraw:
258 args->ar_errors = GFS2_ERRORS_WITHDRAW;
259 break;
260 case Opt_err_panic:
261 if (args->ar_debug) {
262 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
263 "are mutually exclusive.\n");
264 return -EINVAL;
265 }
266 args->ar_errors = GFS2_ERRORS_PANIC;
267 break;
268 case Opt_barrier:
269 args->ar_nobarrier = 0;
270 break;
271 case Opt_nobarrier:
272 args->ar_nobarrier = 1;
273 break;
274 case Opt_rgrplvb:
275 args->ar_rgrplvb = 1;
276 break;
277 case Opt_norgrplvb:
278 args->ar_rgrplvb = 0;
279 break;
280 case Opt_error:
281 default:
282 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
283 return -EINVAL;
284 }
285 }
286
287 return 0;
288 }
289
290 /**
291 * gfs2_jindex_free - Clear all the journal index information
292 * @sdp: The GFS2 superblock
293 *
294 */
295
296 void gfs2_jindex_free(struct gfs2_sbd *sdp)
297 {
298 struct list_head list, *head;
299 struct gfs2_jdesc *jd;
300 struct gfs2_journal_extent *jext;
301
302 spin_lock(&sdp->sd_jindex_spin);
303 list_add(&list, &sdp->sd_jindex_list);
304 list_del_init(&sdp->sd_jindex_list);
305 sdp->sd_journals = 0;
306 spin_unlock(&sdp->sd_jindex_spin);
307
308 while (!list_empty(&list)) {
309 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
310 head = &jd->extent_list;
311 while (!list_empty(head)) {
312 jext = list_entry(head->next,
313 struct gfs2_journal_extent,
314 extent_list);
315 list_del(&jext->extent_list);
316 kfree(jext);
317 }
318 list_del(&jd->jd_list);
319 iput(jd->jd_inode);
320 kfree(jd);
321 }
322 }
323
324 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
325 {
326 struct gfs2_jdesc *jd;
327 int found = 0;
328
329 list_for_each_entry(jd, head, jd_list) {
330 if (jd->jd_jid == jid) {
331 found = 1;
332 break;
333 }
334 }
335
336 if (!found)
337 jd = NULL;
338
339 return jd;
340 }
341
342 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
343 {
344 struct gfs2_jdesc *jd;
345
346 spin_lock(&sdp->sd_jindex_spin);
347 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
348 spin_unlock(&sdp->sd_jindex_spin);
349
350 return jd;
351 }
352
353 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
354 {
355 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
356 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
357 u64 size = i_size_read(jd->jd_inode);
358
359 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
360 return -EIO;
361
362 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
363
364 if (gfs2_write_alloc_required(ip, 0, size)) {
365 gfs2_consist_inode(ip);
366 return -EIO;
367 }
368
369 return 0;
370 }
371
372 /**
373 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
374 * @sdp: the filesystem
375 *
376 * Returns: errno
377 */
378
379 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
380 {
381 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
382 struct gfs2_glock *j_gl = ip->i_gl;
383 struct gfs2_holder t_gh;
384 struct gfs2_log_header_host head;
385 int error;
386
387 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
388 if (error)
389 return error;
390
391 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
392
393 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
394 if (error)
395 goto fail;
396
397 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
398 gfs2_consist(sdp);
399 error = -EIO;
400 goto fail;
401 }
402
403 /* Initialize some head of the log stuff */
404 sdp->sd_log_sequence = head.lh_sequence + 1;
405 gfs2_log_pointers_init(sdp, head.lh_blkno);
406
407 error = gfs2_quota_init(sdp);
408 if (error)
409 goto fail;
410
411 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
412
413 gfs2_glock_dq_uninit(&t_gh);
414
415 return 0;
416
417 fail:
418 t_gh.gh_flags |= GL_NOCACHE;
419 gfs2_glock_dq_uninit(&t_gh);
420
421 return error;
422 }
423
424 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
425 {
426 const struct gfs2_statfs_change *str = buf;
427
428 sc->sc_total = be64_to_cpu(str->sc_total);
429 sc->sc_free = be64_to_cpu(str->sc_free);
430 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
431 }
432
433 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
434 {
435 struct gfs2_statfs_change *str = buf;
436
437 str->sc_total = cpu_to_be64(sc->sc_total);
438 str->sc_free = cpu_to_be64(sc->sc_free);
439 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
440 }
441
442 int gfs2_statfs_init(struct gfs2_sbd *sdp)
443 {
444 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
445 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
446 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
447 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
448 struct buffer_head *m_bh, *l_bh;
449 struct gfs2_holder gh;
450 int error;
451
452 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
453 &gh);
454 if (error)
455 return error;
456
457 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
458 if (error)
459 goto out;
460
461 if (sdp->sd_args.ar_spectator) {
462 spin_lock(&sdp->sd_statfs_spin);
463 gfs2_statfs_change_in(m_sc, m_bh->b_data +
464 sizeof(struct gfs2_dinode));
465 spin_unlock(&sdp->sd_statfs_spin);
466 } else {
467 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
468 if (error)
469 goto out_m_bh;
470
471 spin_lock(&sdp->sd_statfs_spin);
472 gfs2_statfs_change_in(m_sc, m_bh->b_data +
473 sizeof(struct gfs2_dinode));
474 gfs2_statfs_change_in(l_sc, l_bh->b_data +
475 sizeof(struct gfs2_dinode));
476 spin_unlock(&sdp->sd_statfs_spin);
477
478 brelse(l_bh);
479 }
480
481 out_m_bh:
482 brelse(m_bh);
483 out:
484 gfs2_glock_dq_uninit(&gh);
485 return 0;
486 }
487
488 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
489 s64 dinodes)
490 {
491 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
492 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
493 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
494 struct buffer_head *l_bh;
495 s64 x, y;
496 int need_sync = 0;
497 int error;
498
499 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
500 if (error)
501 return;
502
503 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
504
505 spin_lock(&sdp->sd_statfs_spin);
506 l_sc->sc_total += total;
507 l_sc->sc_free += free;
508 l_sc->sc_dinodes += dinodes;
509 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
510 if (sdp->sd_args.ar_statfs_percent) {
511 x = 100 * l_sc->sc_free;
512 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
513 if (x >= y || x <= -y)
514 need_sync = 1;
515 }
516 spin_unlock(&sdp->sd_statfs_spin);
517
518 brelse(l_bh);
519 if (need_sync)
520 gfs2_wake_up_statfs(sdp);
521 }
522
523 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
524 struct buffer_head *l_bh)
525 {
526 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
527 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
528 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
530
531 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
532
533 spin_lock(&sdp->sd_statfs_spin);
534 m_sc->sc_total += l_sc->sc_total;
535 m_sc->sc_free += l_sc->sc_free;
536 m_sc->sc_dinodes += l_sc->sc_dinodes;
537 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
538 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
539 0, sizeof(struct gfs2_statfs_change));
540 spin_unlock(&sdp->sd_statfs_spin);
541
542 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
543 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
544 }
545
546 int gfs2_statfs_sync(struct super_block *sb, int type)
547 {
548 struct gfs2_sbd *sdp = sb->s_fs_info;
549 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
550 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
551 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
552 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
553 struct gfs2_holder gh;
554 struct buffer_head *m_bh, *l_bh;
555 int error;
556
557 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
558 &gh);
559 if (error)
560 return error;
561
562 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
563 if (error)
564 goto out;
565
566 spin_lock(&sdp->sd_statfs_spin);
567 gfs2_statfs_change_in(m_sc, m_bh->b_data +
568 sizeof(struct gfs2_dinode));
569 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
570 spin_unlock(&sdp->sd_statfs_spin);
571 goto out_bh;
572 }
573 spin_unlock(&sdp->sd_statfs_spin);
574
575 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
576 if (error)
577 goto out_bh;
578
579 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
580 if (error)
581 goto out_bh2;
582
583 update_statfs(sdp, m_bh, l_bh);
584 sdp->sd_statfs_force_sync = 0;
585
586 gfs2_trans_end(sdp);
587
588 out_bh2:
589 brelse(l_bh);
590 out_bh:
591 brelse(m_bh);
592 out:
593 gfs2_glock_dq_uninit(&gh);
594 return error;
595 }
596
597 struct lfcc {
598 struct list_head list;
599 struct gfs2_holder gh;
600 };
601
602 /**
603 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
604 * journals are clean
605 * @sdp: the file system
606 * @state: the state to put the transaction lock into
607 * @t_gh: the hold on the transaction lock
608 *
609 * Returns: errno
610 */
611
612 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
613 struct gfs2_holder *t_gh)
614 {
615 struct gfs2_inode *ip;
616 struct gfs2_jdesc *jd;
617 struct lfcc *lfcc;
618 LIST_HEAD(list);
619 struct gfs2_log_header_host lh;
620 int error;
621
622 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
623 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
624 if (!lfcc) {
625 error = -ENOMEM;
626 goto out;
627 }
628 ip = GFS2_I(jd->jd_inode);
629 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
630 if (error) {
631 kfree(lfcc);
632 goto out;
633 }
634 list_add(&lfcc->list, &list);
635 }
636
637 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
638 GL_NOCACHE, t_gh);
639
640 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
641 error = gfs2_jdesc_check(jd);
642 if (error)
643 break;
644 error = gfs2_find_jhead(jd, &lh);
645 if (error)
646 break;
647 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
648 error = -EBUSY;
649 break;
650 }
651 }
652
653 if (error)
654 gfs2_glock_dq_uninit(t_gh);
655
656 out:
657 while (!list_empty(&list)) {
658 lfcc = list_entry(list.next, struct lfcc, list);
659 list_del(&lfcc->list);
660 gfs2_glock_dq_uninit(&lfcc->gh);
661 kfree(lfcc);
662 }
663 return error;
664 }
665
666 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
667 {
668 struct gfs2_dinode *str = buf;
669
670 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
671 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
672 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
673 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
674 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
675 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
676 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
677 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
678 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
679 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
680 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
681 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
682 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
683 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
684
685 str->di_goal_meta = cpu_to_be64(ip->i_goal);
686 str->di_goal_data = cpu_to_be64(ip->i_goal);
687 str->di_generation = cpu_to_be64(ip->i_generation);
688
689 str->di_flags = cpu_to_be32(ip->i_diskflags);
690 str->di_height = cpu_to_be16(ip->i_height);
691 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
692 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
693 GFS2_FORMAT_DE : 0);
694 str->di_depth = cpu_to_be16(ip->i_depth);
695 str->di_entries = cpu_to_be32(ip->i_entries);
696
697 str->di_eattr = cpu_to_be64(ip->i_eattr);
698 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
699 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
700 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
701 }
702
703 /**
704 * gfs2_write_inode - Make sure the inode is stable on the disk
705 * @inode: The inode
706 * @wbc: The writeback control structure
707 *
708 * Returns: errno
709 */
710
711 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
712 {
713 struct gfs2_inode *ip = GFS2_I(inode);
714 struct gfs2_sbd *sdp = GFS2_SB(inode);
715 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
716 struct backing_dev_info *bdi = metamapping->backing_dev_info;
717 int ret = 0;
718
719 if (wbc->sync_mode == WB_SYNC_ALL)
720 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
721 if (bdi->dirty_exceeded)
722 gfs2_ail1_flush(sdp, wbc);
723 else
724 filemap_fdatawrite(metamapping);
725 if (wbc->sync_mode == WB_SYNC_ALL)
726 ret = filemap_fdatawait(metamapping);
727 if (ret)
728 mark_inode_dirty_sync(inode);
729 return ret;
730 }
731
732 /**
733 * gfs2_dirty_inode - check for atime updates
734 * @inode: The inode in question
735 * @flags: The type of dirty
736 *
737 * Unfortunately it can be called under any combination of inode
738 * glock and transaction lock, so we have to check carefully.
739 *
740 * At the moment this deals only with atime - it should be possible
741 * to expand that role in future, once a review of the locking has
742 * been carried out.
743 */
744
745 static void gfs2_dirty_inode(struct inode *inode, int flags)
746 {
747 struct gfs2_inode *ip = GFS2_I(inode);
748 struct gfs2_sbd *sdp = GFS2_SB(inode);
749 struct buffer_head *bh;
750 struct gfs2_holder gh;
751 int need_unlock = 0;
752 int need_endtrans = 0;
753 int ret;
754
755 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
756 return;
757
758 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
759 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
760 if (ret) {
761 fs_err(sdp, "dirty_inode: glock %d\n", ret);
762 return;
763 }
764 need_unlock = 1;
765 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
766 return;
767
768 if (current->journal_info == NULL) {
769 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
770 if (ret) {
771 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
772 goto out;
773 }
774 need_endtrans = 1;
775 }
776
777 ret = gfs2_meta_inode_buffer(ip, &bh);
778 if (ret == 0) {
779 gfs2_trans_add_meta(ip->i_gl, bh);
780 gfs2_dinode_out(ip, bh->b_data);
781 brelse(bh);
782 }
783
784 if (need_endtrans)
785 gfs2_trans_end(sdp);
786 out:
787 if (need_unlock)
788 gfs2_glock_dq_uninit(&gh);
789 }
790
791 /**
792 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
793 * @sdp: the filesystem
794 *
795 * Returns: errno
796 */
797
798 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
799 {
800 struct gfs2_holder t_gh;
801 int error;
802
803 flush_workqueue(gfs2_delete_workqueue);
804 gfs2_quota_sync(sdp->sd_vfs, 0);
805 gfs2_statfs_sync(sdp->sd_vfs, 0);
806
807 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
808 &t_gh);
809 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
810 return error;
811
812 gfs2_meta_syncfs(sdp);
813 gfs2_log_shutdown(sdp);
814
815 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
816
817 if (t_gh.gh_gl)
818 gfs2_glock_dq_uninit(&t_gh);
819
820 gfs2_quota_cleanup(sdp);
821
822 return error;
823 }
824
825 static int gfs2_umount_recovery_wait(void *word)
826 {
827 schedule();
828 return 0;
829 }
830
831 /**
832 * gfs2_put_super - Unmount the filesystem
833 * @sb: The VFS superblock
834 *
835 */
836
837 static void gfs2_put_super(struct super_block *sb)
838 {
839 struct gfs2_sbd *sdp = sb->s_fs_info;
840 int error;
841 struct gfs2_jdesc *jd;
842
843 /* No more recovery requests */
844 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
845 smp_mb();
846
847 /* Wait on outstanding recovery */
848 restart:
849 spin_lock(&sdp->sd_jindex_spin);
850 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
851 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
852 continue;
853 spin_unlock(&sdp->sd_jindex_spin);
854 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
855 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
856 goto restart;
857 }
858 spin_unlock(&sdp->sd_jindex_spin);
859
860 kthread_stop(sdp->sd_quotad_process);
861 kthread_stop(sdp->sd_logd_process);
862
863 if (!(sb->s_flags & MS_RDONLY)) {
864 error = gfs2_make_fs_ro(sdp);
865 if (error)
866 gfs2_io_error(sdp);
867 }
868 /* At this point, we're through modifying the disk */
869
870 /* Release stuff */
871
872 iput(sdp->sd_jindex);
873 iput(sdp->sd_statfs_inode);
874 iput(sdp->sd_rindex);
875 iput(sdp->sd_quota_inode);
876
877 gfs2_glock_put(sdp->sd_rename_gl);
878 gfs2_glock_put(sdp->sd_trans_gl);
879
880 if (!sdp->sd_args.ar_spectator) {
881 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
882 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
883 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
884 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
885 iput(sdp->sd_sc_inode);
886 iput(sdp->sd_qc_inode);
887 }
888
889 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
890 gfs2_clear_rgrpd(sdp);
891 gfs2_jindex_free(sdp);
892 /* Take apart glock structures and buffer lists */
893 gfs2_gl_hash_clear(sdp);
894 /* Unmount the locking protocol */
895 gfs2_lm_unmount(sdp);
896
897 /* At this point, we're through participating in the lockspace */
898 gfs2_sys_fs_del(sdp);
899 }
900
901 /**
902 * gfs2_sync_fs - sync the filesystem
903 * @sb: the superblock
904 *
905 * Flushes the log to disk.
906 */
907
908 static int gfs2_sync_fs(struct super_block *sb, int wait)
909 {
910 struct gfs2_sbd *sdp = sb->s_fs_info;
911
912 gfs2_quota_sync(sb, -1);
913 if (wait && sdp)
914 gfs2_log_flush(sdp, NULL);
915 return 0;
916 }
917
918 /**
919 * gfs2_freeze - prevent further writes to the filesystem
920 * @sb: the VFS structure for the filesystem
921 *
922 */
923
924 static int gfs2_freeze(struct super_block *sb)
925 {
926 struct gfs2_sbd *sdp = sb->s_fs_info;
927 int error;
928
929 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
930 return -EINVAL;
931
932 for (;;) {
933 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
934 if (!error)
935 break;
936
937 switch (error) {
938 case -EBUSY:
939 fs_err(sdp, "waiting for recovery before freeze\n");
940 break;
941
942 default:
943 fs_err(sdp, "error freezing FS: %d\n", error);
944 break;
945 }
946
947 fs_err(sdp, "retrying...\n");
948 msleep(1000);
949 }
950 return 0;
951 }
952
953 /**
954 * gfs2_unfreeze - reallow writes to the filesystem
955 * @sb: the VFS structure for the filesystem
956 *
957 */
958
959 static int gfs2_unfreeze(struct super_block *sb)
960 {
961 struct gfs2_sbd *sdp = sb->s_fs_info;
962
963 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
964 return 0;
965 }
966
967 /**
968 * statfs_fill - fill in the sg for a given RG
969 * @rgd: the RG
970 * @sc: the sc structure
971 *
972 * Returns: 0 on success, -ESTALE if the LVB is invalid
973 */
974
975 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
976 struct gfs2_statfs_change_host *sc)
977 {
978 gfs2_rgrp_verify(rgd);
979 sc->sc_total += rgd->rd_data;
980 sc->sc_free += rgd->rd_free;
981 sc->sc_dinodes += rgd->rd_dinodes;
982 return 0;
983 }
984
985 /**
986 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
987 * @sdp: the filesystem
988 * @sc: the sc info that will be returned
989 *
990 * Any error (other than a signal) will cause this routine to fall back
991 * to the synchronous version.
992 *
993 * FIXME: This really shouldn't busy wait like this.
994 *
995 * Returns: errno
996 */
997
998 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
999 {
1000 struct gfs2_rgrpd *rgd_next;
1001 struct gfs2_holder *gha, *gh;
1002 unsigned int slots = 64;
1003 unsigned int x;
1004 int done;
1005 int error = 0, err;
1006
1007 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1008 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1009 if (!gha)
1010 return -ENOMEM;
1011
1012 rgd_next = gfs2_rgrpd_get_first(sdp);
1013
1014 for (;;) {
1015 done = 1;
1016
1017 for (x = 0; x < slots; x++) {
1018 gh = gha + x;
1019
1020 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1021 err = gfs2_glock_wait(gh);
1022 if (err) {
1023 gfs2_holder_uninit(gh);
1024 error = err;
1025 } else {
1026 if (!error)
1027 error = statfs_slow_fill(
1028 gh->gh_gl->gl_object, sc);
1029 gfs2_glock_dq_uninit(gh);
1030 }
1031 }
1032
1033 if (gh->gh_gl)
1034 done = 0;
1035 else if (rgd_next && !error) {
1036 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1037 LM_ST_SHARED,
1038 GL_ASYNC,
1039 gh);
1040 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1041 done = 0;
1042 }
1043
1044 if (signal_pending(current))
1045 error = -ERESTARTSYS;
1046 }
1047
1048 if (done)
1049 break;
1050
1051 yield();
1052 }
1053
1054 kfree(gha);
1055 return error;
1056 }
1057
1058 /**
1059 * gfs2_statfs_i - Do a statfs
1060 * @sdp: the filesystem
1061 * @sg: the sg structure
1062 *
1063 * Returns: errno
1064 */
1065
1066 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1067 {
1068 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1069 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1070
1071 spin_lock(&sdp->sd_statfs_spin);
1072
1073 *sc = *m_sc;
1074 sc->sc_total += l_sc->sc_total;
1075 sc->sc_free += l_sc->sc_free;
1076 sc->sc_dinodes += l_sc->sc_dinodes;
1077
1078 spin_unlock(&sdp->sd_statfs_spin);
1079
1080 if (sc->sc_free < 0)
1081 sc->sc_free = 0;
1082 if (sc->sc_free > sc->sc_total)
1083 sc->sc_free = sc->sc_total;
1084 if (sc->sc_dinodes < 0)
1085 sc->sc_dinodes = 0;
1086
1087 return 0;
1088 }
1089
1090 /**
1091 * gfs2_statfs - Gather and return stats about the filesystem
1092 * @sb: The superblock
1093 * @statfsbuf: The buffer
1094 *
1095 * Returns: 0 on success or error code
1096 */
1097
1098 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1099 {
1100 struct super_block *sb = dentry->d_inode->i_sb;
1101 struct gfs2_sbd *sdp = sb->s_fs_info;
1102 struct gfs2_statfs_change_host sc;
1103 int error;
1104
1105 error = gfs2_rindex_update(sdp);
1106 if (error)
1107 return error;
1108
1109 if (gfs2_tune_get(sdp, gt_statfs_slow))
1110 error = gfs2_statfs_slow(sdp, &sc);
1111 else
1112 error = gfs2_statfs_i(sdp, &sc);
1113
1114 if (error)
1115 return error;
1116
1117 buf->f_type = GFS2_MAGIC;
1118 buf->f_bsize = sdp->sd_sb.sb_bsize;
1119 buf->f_blocks = sc.sc_total;
1120 buf->f_bfree = sc.sc_free;
1121 buf->f_bavail = sc.sc_free;
1122 buf->f_files = sc.sc_dinodes + sc.sc_free;
1123 buf->f_ffree = sc.sc_free;
1124 buf->f_namelen = GFS2_FNAMESIZE;
1125
1126 return 0;
1127 }
1128
1129 /**
1130 * gfs2_remount_fs - called when the FS is remounted
1131 * @sb: the filesystem
1132 * @flags: the remount flags
1133 * @data: extra data passed in (not used right now)
1134 *
1135 * Returns: errno
1136 */
1137
1138 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1139 {
1140 struct gfs2_sbd *sdp = sb->s_fs_info;
1141 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1142 struct gfs2_tune *gt = &sdp->sd_tune;
1143 int error;
1144
1145 spin_lock(&gt->gt_spin);
1146 args.ar_commit = gt->gt_logd_secs;
1147 args.ar_quota_quantum = gt->gt_quota_quantum;
1148 if (gt->gt_statfs_slow)
1149 args.ar_statfs_quantum = 0;
1150 else
1151 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1152 spin_unlock(&gt->gt_spin);
1153 error = gfs2_mount_args(&args, data);
1154 if (error)
1155 return error;
1156
1157 /* Not allowed to change locking details */
1158 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1159 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1160 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1161 return -EINVAL;
1162
1163 /* Some flags must not be changed */
1164 if (args_neq(&args, &sdp->sd_args, spectator) ||
1165 args_neq(&args, &sdp->sd_args, localflocks) ||
1166 args_neq(&args, &sdp->sd_args, meta))
1167 return -EINVAL;
1168
1169 if (sdp->sd_args.ar_spectator)
1170 *flags |= MS_RDONLY;
1171
1172 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1173 if (*flags & MS_RDONLY)
1174 error = gfs2_make_fs_ro(sdp);
1175 else
1176 error = gfs2_make_fs_rw(sdp);
1177 if (error)
1178 return error;
1179 }
1180
1181 sdp->sd_args = args;
1182 if (sdp->sd_args.ar_posix_acl)
1183 sb->s_flags |= MS_POSIXACL;
1184 else
1185 sb->s_flags &= ~MS_POSIXACL;
1186 if (sdp->sd_args.ar_nobarrier)
1187 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1188 else
1189 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1190 spin_lock(&gt->gt_spin);
1191 gt->gt_logd_secs = args.ar_commit;
1192 gt->gt_quota_quantum = args.ar_quota_quantum;
1193 if (args.ar_statfs_quantum) {
1194 gt->gt_statfs_slow = 0;
1195 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1196 }
1197 else {
1198 gt->gt_statfs_slow = 1;
1199 gt->gt_statfs_quantum = 30;
1200 }
1201 spin_unlock(&gt->gt_spin);
1202
1203 gfs2_online_uevent(sdp);
1204 return 0;
1205 }
1206
1207 /**
1208 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1209 * @inode: The inode to drop
1210 *
1211 * If we've received a callback on an iopen lock then its because a
1212 * remote node tried to deallocate the inode but failed due to this node
1213 * still having the inode open. Here we mark the link count zero
1214 * since we know that it must have reached zero if the GLF_DEMOTE flag
1215 * is set on the iopen glock. If we didn't do a disk read since the
1216 * remote node removed the final link then we might otherwise miss
1217 * this event. This check ensures that this node will deallocate the
1218 * inode's blocks, or alternatively pass the baton on to another
1219 * node for later deallocation.
1220 */
1221
1222 static int gfs2_drop_inode(struct inode *inode)
1223 {
1224 struct gfs2_inode *ip = GFS2_I(inode);
1225
1226 if (inode->i_nlink) {
1227 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1228 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1229 clear_nlink(inode);
1230 }
1231 return generic_drop_inode(inode);
1232 }
1233
1234 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1235 {
1236 do {
1237 if (d1 == d2)
1238 return 1;
1239 d1 = d1->d_parent;
1240 } while (!IS_ROOT(d1));
1241 return 0;
1242 }
1243
1244 /**
1245 * gfs2_show_options - Show mount options for /proc/mounts
1246 * @s: seq_file structure
1247 * @root: root of this (sub)tree
1248 *
1249 * Returns: 0 on success or error code
1250 */
1251
1252 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1253 {
1254 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1255 struct gfs2_args *args = &sdp->sd_args;
1256 int val;
1257
1258 if (is_ancestor(root, sdp->sd_master_dir))
1259 seq_printf(s, ",meta");
1260 if (args->ar_lockproto[0])
1261 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1262 if (args->ar_locktable[0])
1263 seq_printf(s, ",locktable=%s", args->ar_locktable);
1264 if (args->ar_hostdata[0])
1265 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1266 if (args->ar_spectator)
1267 seq_printf(s, ",spectator");
1268 if (args->ar_localflocks)
1269 seq_printf(s, ",localflocks");
1270 if (args->ar_debug)
1271 seq_printf(s, ",debug");
1272 if (args->ar_posix_acl)
1273 seq_printf(s, ",acl");
1274 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1275 char *state;
1276 switch (args->ar_quota) {
1277 case GFS2_QUOTA_OFF:
1278 state = "off";
1279 break;
1280 case GFS2_QUOTA_ACCOUNT:
1281 state = "account";
1282 break;
1283 case GFS2_QUOTA_ON:
1284 state = "on";
1285 break;
1286 default:
1287 state = "unknown";
1288 break;
1289 }
1290 seq_printf(s, ",quota=%s", state);
1291 }
1292 if (args->ar_suiddir)
1293 seq_printf(s, ",suiddir");
1294 if (args->ar_data != GFS2_DATA_DEFAULT) {
1295 char *state;
1296 switch (args->ar_data) {
1297 case GFS2_DATA_WRITEBACK:
1298 state = "writeback";
1299 break;
1300 case GFS2_DATA_ORDERED:
1301 state = "ordered";
1302 break;
1303 default:
1304 state = "unknown";
1305 break;
1306 }
1307 seq_printf(s, ",data=%s", state);
1308 }
1309 if (args->ar_discard)
1310 seq_printf(s, ",discard");
1311 val = sdp->sd_tune.gt_logd_secs;
1312 if (val != 30)
1313 seq_printf(s, ",commit=%d", val);
1314 val = sdp->sd_tune.gt_statfs_quantum;
1315 if (val != 30)
1316 seq_printf(s, ",statfs_quantum=%d", val);
1317 else if (sdp->sd_tune.gt_statfs_slow)
1318 seq_puts(s, ",statfs_quantum=0");
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 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1343 seq_printf(s, ",demote_interface_used");
1344 if (args->ar_rgrplvb)
1345 seq_printf(s, ",rgrplvb");
1346 return 0;
1347 }
1348
1349 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1350 {
1351 struct inode *inode = &ip->i_inode;
1352 struct gfs2_glock *gl = ip->i_gl;
1353
1354 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1355 truncate_inode_pages(&inode->i_data, 0);
1356
1357 if (atomic_read(&gl->gl_revokes) == 0) {
1358 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1359 clear_bit(GLF_DIRTY, &gl->gl_flags);
1360 }
1361 }
1362
1363 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1364 {
1365 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1366 struct gfs2_rgrpd *rgd;
1367 struct gfs2_holder gh;
1368 int error;
1369
1370 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1371 gfs2_consist_inode(ip);
1372 return -EIO;
1373 }
1374
1375 error = gfs2_rindex_update(sdp);
1376 if (error)
1377 return error;
1378
1379 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1380 if (error)
1381 return error;
1382
1383 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1384 if (!rgd) {
1385 gfs2_consist_inode(ip);
1386 error = -EIO;
1387 goto out_qs;
1388 }
1389
1390 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1391 if (error)
1392 goto out_qs;
1393
1394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1395 sdp->sd_jdesc->jd_blocks);
1396 if (error)
1397 goto out_rg_gunlock;
1398
1399 gfs2_free_di(rgd, ip);
1400
1401 gfs2_final_release_pages(ip);
1402
1403 gfs2_trans_end(sdp);
1404
1405 out_rg_gunlock:
1406 gfs2_glock_dq_uninit(&gh);
1407 out_qs:
1408 gfs2_quota_unhold(ip);
1409 return error;
1410 }
1411
1412 /**
1413 * gfs2_evict_inode - Remove an inode from cache
1414 * @inode: The inode to evict
1415 *
1416 * There are three cases to consider:
1417 * 1. i_nlink == 0, we are final opener (and must deallocate)
1418 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1419 * 3. i_nlink > 0
1420 *
1421 * If the fs is read only, then we have to treat all cases as per #3
1422 * since we are unable to do any deallocation. The inode will be
1423 * deallocated by the next read/write node to attempt an allocation
1424 * in the same resource group
1425 *
1426 * We have to (at the moment) hold the inodes main lock to cover
1427 * the gap between unlocking the shared lock on the iopen lock and
1428 * taking the exclusive lock. I'd rather do a shared -> exclusive
1429 * conversion on the iopen lock, but we can change that later. This
1430 * is safe, just less efficient.
1431 */
1432
1433 static void gfs2_evict_inode(struct inode *inode)
1434 {
1435 struct super_block *sb = inode->i_sb;
1436 struct gfs2_sbd *sdp = sb->s_fs_info;
1437 struct gfs2_inode *ip = GFS2_I(inode);
1438 struct gfs2_holder gh;
1439 int error;
1440
1441 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1442 goto out;
1443
1444 /* Must not read inode block until block type has been verified */
1445 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1446 if (unlikely(error)) {
1447 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1448 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1449 goto out;
1450 }
1451
1452 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1453 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1454 if (error)
1455 goto out_truncate;
1456 }
1457
1458 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1459 error = gfs2_inode_refresh(ip);
1460 if (error)
1461 goto out_truncate;
1462 }
1463
1464 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1465 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1466 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1467 error = gfs2_glock_nq(&ip->i_iopen_gh);
1468 if (error)
1469 goto out_truncate;
1470
1471 /* Case 1 starts here */
1472
1473 if (S_ISDIR(inode->i_mode) &&
1474 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1475 error = gfs2_dir_exhash_dealloc(ip);
1476 if (error)
1477 goto out_unlock;
1478 }
1479
1480 if (ip->i_eattr) {
1481 error = gfs2_ea_dealloc(ip);
1482 if (error)
1483 goto out_unlock;
1484 }
1485
1486 if (!gfs2_is_stuffed(ip)) {
1487 error = gfs2_file_dealloc(ip);
1488 if (error)
1489 goto out_unlock;
1490 }
1491
1492 error = gfs2_dinode_dealloc(ip);
1493 goto out_unlock;
1494
1495 out_truncate:
1496 gfs2_log_flush(sdp, ip->i_gl);
1497 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1498 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1499 filemap_fdatawrite(metamapping);
1500 filemap_fdatawait(metamapping);
1501 }
1502 write_inode_now(inode, 1);
1503 gfs2_ail_flush(ip->i_gl, 0);
1504
1505 /* Case 2 starts here */
1506 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1507 if (error)
1508 goto out_unlock;
1509 /* Needs to be done before glock release & also in a transaction */
1510 truncate_inode_pages(&inode->i_data, 0);
1511 gfs2_trans_end(sdp);
1512
1513 out_unlock:
1514 /* Error path for case 1 */
1515 if (gfs2_rs_active(ip->i_res))
1516 gfs2_rs_deltree(ip->i_res);
1517
1518 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1519 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1520 gfs2_glock_dq(&ip->i_iopen_gh);
1521 }
1522 gfs2_holder_uninit(&ip->i_iopen_gh);
1523 gfs2_glock_dq_uninit(&gh);
1524 if (error && error != GLR_TRYFAILED && error != -EROFS)
1525 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1526 out:
1527 /* Case 3 starts here */
1528 truncate_inode_pages(&inode->i_data, 0);
1529 gfs2_rs_delete(ip);
1530 gfs2_ordered_del_inode(ip);
1531 clear_inode(inode);
1532 gfs2_dir_hash_inval(ip);
1533 ip->i_gl->gl_object = NULL;
1534 flush_delayed_work(&ip->i_gl->gl_work);
1535 gfs2_glock_add_to_lru(ip->i_gl);
1536 gfs2_glock_put(ip->i_gl);
1537 ip->i_gl = NULL;
1538 if (ip->i_iopen_gh.gh_gl) {
1539 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1540 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1541 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1542 }
1543 }
1544
1545 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1546 {
1547 struct gfs2_inode *ip;
1548
1549 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1550 if (ip) {
1551 ip->i_flags = 0;
1552 ip->i_gl = NULL;
1553 ip->i_rgd = NULL;
1554 ip->i_res = NULL;
1555 }
1556 return &ip->i_inode;
1557 }
1558
1559 static void gfs2_i_callback(struct rcu_head *head)
1560 {
1561 struct inode *inode = container_of(head, struct inode, i_rcu);
1562 kmem_cache_free(gfs2_inode_cachep, inode);
1563 }
1564
1565 static void gfs2_destroy_inode(struct inode *inode)
1566 {
1567 call_rcu(&inode->i_rcu, gfs2_i_callback);
1568 }
1569
1570 const struct super_operations gfs2_super_ops = {
1571 .alloc_inode = gfs2_alloc_inode,
1572 .destroy_inode = gfs2_destroy_inode,
1573 .write_inode = gfs2_write_inode,
1574 .dirty_inode = gfs2_dirty_inode,
1575 .evict_inode = gfs2_evict_inode,
1576 .put_super = gfs2_put_super,
1577 .sync_fs = gfs2_sync_fs,
1578 .freeze_fs = gfs2_freeze,
1579 .unfreeze_fs = gfs2_unfreeze,
1580 .statfs = gfs2_statfs,
1581 .remount_fs = gfs2_remount_fs,
1582 .drop_inode = gfs2_drop_inode,
1583 .show_options = gfs2_show_options,
1584 };
1585
Linus' kernel tree