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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
48enum {
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_error,
82};
83
84static const match_table_t tokens = {
85 {Opt_lockproto, "lockproto=%s"},
86 {Opt_locktable, "locktable=%s"},
87 {Opt_hostdata, "hostdata=%s"},
88 {Opt_spectator, "spectator"},
89 {Opt_spectator, "norecovery"},
90 {Opt_ignore_local_fs, "ignore_local_fs"},
91 {Opt_localflocks, "localflocks"},
92 {Opt_localcaching, "localcaching"},
93 {Opt_debug, "debug"},
94 {Opt_nodebug, "nodebug"},
95 {Opt_upgrade, "upgrade"},
96 {Opt_acl, "acl"},
97 {Opt_noacl, "noacl"},
98 {Opt_quota_off, "quota=off"},
99 {Opt_quota_account, "quota=account"},
100 {Opt_quota_on, "quota=on"},
101 {Opt_quota, "quota"},
102 {Opt_noquota, "noquota"},
103 {Opt_suiddir, "suiddir"},
104 {Opt_nosuiddir, "nosuiddir"},
105 {Opt_data_writeback, "data=writeback"},
106 {Opt_data_ordered, "data=ordered"},
107 {Opt_meta, "meta"},
108 {Opt_discard, "discard"},
109 {Opt_nodiscard, "nodiscard"},
110 {Opt_commit, "commit=%d"},
111 {Opt_err_withdraw, "errors=withdraw"},
112 {Opt_err_panic, "errors=panic"},
113 {Opt_statfs_quantum, "statfs_quantum=%d"},
114 {Opt_statfs_percent, "statfs_percent=%d"},
115 {Opt_quota_quantum, "quota_quantum=%d"},
116 {Opt_barrier, "barrier"},
117 {Opt_nobarrier, "nobarrier"},
118 {Opt_error, NULL}
119};
120
121/**
122 * gfs2_mount_args - Parse mount options
123 * @args: The structure into which the parsed options will be written
124 * @options: The options to parse
125 *
126 * Return: errno
127 */
128
129int gfs2_mount_args(struct gfs2_args *args, char *options)
130{
131 char *o;
132 int token;
133 substring_t tmp[MAX_OPT_ARGS];
134 int rv;
135
136 /* Split the options into tokens with the "," character and
137 process them */
138
139 while (1) {
140 o = strsep(&options, ",");
141 if (o == NULL)
142 break;
143 if (*o == '\0')
144 continue;
145
146 token = match_token(o, tokens, tmp);
147 switch (token) {
148 case Opt_lockproto:
149 match_strlcpy(args->ar_lockproto, &tmp[0],
150 GFS2_LOCKNAME_LEN);
151 break;
152 case Opt_locktable:
153 match_strlcpy(args->ar_locktable, &tmp[0],
154 GFS2_LOCKNAME_LEN);
155 break;
156 case Opt_hostdata:
157 match_strlcpy(args->ar_hostdata, &tmp[0],
158 GFS2_LOCKNAME_LEN);
159 break;
160 case Opt_spectator:
161 args->ar_spectator = 1;
162 break;
163 case Opt_ignore_local_fs:
164 /* Retained for backwards compat only */
165 break;
166 case Opt_localflocks:
167 args->ar_localflocks = 1;
168 break;
169 case Opt_localcaching:
170 /* Retained for backwards compat only */
171 break;
172 case Opt_debug:
173 if (args->ar_errors == GFS2_ERRORS_PANIC) {
174 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
175 "are mutually exclusive.\n");
176 return -EINVAL;
177 }
178 args->ar_debug = 1;
179 break;
180 case Opt_nodebug:
181 args->ar_debug = 0;
182 break;
183 case Opt_upgrade:
184 /* Retained for backwards compat only */
185 break;
186 case Opt_acl:
187 args->ar_posix_acl = 1;
188 break;
189 case Opt_noacl:
190 args->ar_posix_acl = 0;
191 break;
192 case Opt_quota_off:
193 case Opt_noquota:
194 args->ar_quota = GFS2_QUOTA_OFF;
195 break;
196 case Opt_quota_account:
197 args->ar_quota = GFS2_QUOTA_ACCOUNT;
198 break;
199 case Opt_quota_on:
200 case Opt_quota:
201 args->ar_quota = GFS2_QUOTA_ON;
202 break;
203 case Opt_suiddir:
204 args->ar_suiddir = 1;
205 break;
206 case Opt_nosuiddir:
207 args->ar_suiddir = 0;
208 break;
209 case Opt_data_writeback:
210 args->ar_data = GFS2_DATA_WRITEBACK;
211 break;
212 case Opt_data_ordered:
213 args->ar_data = GFS2_DATA_ORDERED;
214 break;
215 case Opt_meta:
216 args->ar_meta = 1;
217 break;
218 case Opt_discard:
219 args->ar_discard = 1;
220 break;
221 case Opt_nodiscard:
222 args->ar_discard = 0;
223 break;
224 case Opt_commit:
225 rv = match_int(&tmp[0], &args->ar_commit);
226 if (rv || args->ar_commit <= 0) {
227 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
228 return rv ? rv : -EINVAL;
229 }
230 break;
231 case Opt_statfs_quantum:
232 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
233 if (rv || args->ar_statfs_quantum < 0) {
234 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
235 return rv ? rv : -EINVAL;
236 }
237 break;
238 case Opt_quota_quantum:
239 rv = match_int(&tmp[0], &args->ar_quota_quantum);
240 if (rv || args->ar_quota_quantum <= 0) {
241 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
242 return rv ? rv : -EINVAL;
243 }
244 break;
245 case Opt_statfs_percent:
246 rv = match_int(&tmp[0], &args->ar_statfs_percent);
247 if (rv || args->ar_statfs_percent < 0 ||
248 args->ar_statfs_percent > 100) {
249 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
250 return rv ? rv : -EINVAL;
251 }
252 break;
253 case Opt_err_withdraw:
254 args->ar_errors = GFS2_ERRORS_WITHDRAW;
255 break;
256 case Opt_err_panic:
257 if (args->ar_debug) {
258 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
259 "are mutually exclusive.\n");
260 return -EINVAL;
261 }
262 args->ar_errors = GFS2_ERRORS_PANIC;
263 break;
264 case Opt_barrier:
265 args->ar_nobarrier = 0;
266 break;
267 case Opt_nobarrier:
268 args->ar_nobarrier = 1;
269 break;
270 case Opt_error:
271 default:
272 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
273 return -EINVAL;
274 }
275 }
276
277 return 0;
278}
279
280/**
281 * gfs2_jindex_free - Clear all the journal index information
282 * @sdp: The GFS2 superblock
283 *
284 */
285
286void gfs2_jindex_free(struct gfs2_sbd *sdp)
287{
288 struct list_head list, *head;
289 struct gfs2_jdesc *jd;
290 struct gfs2_journal_extent *jext;
291
292 spin_lock(&sdp->sd_jindex_spin);
293 list_add(&list, &sdp->sd_jindex_list);
294 list_del_init(&sdp->sd_jindex_list);
295 sdp->sd_journals = 0;
296 spin_unlock(&sdp->sd_jindex_spin);
297
298 while (!list_empty(&list)) {
299 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
300 head = &jd->extent_list;
301 while (!list_empty(head)) {
302 jext = list_entry(head->next,
303 struct gfs2_journal_extent,
304 extent_list);
305 list_del(&jext->extent_list);
306 kfree(jext);
307 }
308 list_del(&jd->jd_list);
309 iput(jd->jd_inode);
310 kfree(jd);
311 }
312}
313
314static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
315{
316 struct gfs2_jdesc *jd;
317 int found = 0;
318
319 list_for_each_entry(jd, head, jd_list) {
320 if (jd->jd_jid == jid) {
321 found = 1;
322 break;
323 }
324 }
325
326 if (!found)
327 jd = NULL;
328
329 return jd;
330}
331
332struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
333{
334 struct gfs2_jdesc *jd;
335
336 spin_lock(&sdp->sd_jindex_spin);
337 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
338 spin_unlock(&sdp->sd_jindex_spin);
339
340 return jd;
341}
342
343int gfs2_jdesc_check(struct gfs2_jdesc *jd)
344{
345 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
346 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
347 u64 size = i_size_read(jd->jd_inode);
348
349 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
350 return -EIO;
351
352 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
353
354 if (gfs2_write_alloc_required(ip, 0, size)) {
355 gfs2_consist_inode(ip);
356 return -EIO;
357 }
358
359 return 0;
360}
361
362/**
363 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
364 * @sdp: the filesystem
365 *
366 * Returns: errno
367 */
368
369int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
370{
371 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
372 struct gfs2_glock *j_gl = ip->i_gl;
373 struct gfs2_holder t_gh;
374 struct gfs2_log_header_host head;
375 int error;
376
377 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
378 if (error)
379 return error;
380
381 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
382
383 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
384 if (error)
385 goto fail;
386
387 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
388 gfs2_consist(sdp);
389 error = -EIO;
390 goto fail;
391 }
392
393 /* Initialize some head of the log stuff */
394 sdp->sd_log_sequence = head.lh_sequence + 1;
395 gfs2_log_pointers_init(sdp, head.lh_blkno);
396
397 error = gfs2_quota_init(sdp);
398 if (error)
399 goto fail;
400
401 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
402
403 gfs2_glock_dq_uninit(&t_gh);
404
405 return 0;
406
407fail:
408 t_gh.gh_flags |= GL_NOCACHE;
409 gfs2_glock_dq_uninit(&t_gh);
410
411 return error;
412}
413
414void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
415{
416 const struct gfs2_statfs_change *str = buf;
417
418 sc->sc_total = be64_to_cpu(str->sc_total);
419 sc->sc_free = be64_to_cpu(str->sc_free);
420 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
421}
422
423static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
424{
425 struct gfs2_statfs_change *str = buf;
426
427 str->sc_total = cpu_to_be64(sc->sc_total);
428 str->sc_free = cpu_to_be64(sc->sc_free);
429 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
430}
431
432int gfs2_statfs_init(struct gfs2_sbd *sdp)
433{
434 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
435 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
436 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
437 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
438 struct buffer_head *m_bh, *l_bh;
439 struct gfs2_holder gh;
440 int error;
441
442 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
443 &gh);
444 if (error)
445 return error;
446
447 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
448 if (error)
449 goto out;
450
451 if (sdp->sd_args.ar_spectator) {
452 spin_lock(&sdp->sd_statfs_spin);
453 gfs2_statfs_change_in(m_sc, m_bh->b_data +
454 sizeof(struct gfs2_dinode));
455 spin_unlock(&sdp->sd_statfs_spin);
456 } else {
457 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
458 if (error)
459 goto out_m_bh;
460
461 spin_lock(&sdp->sd_statfs_spin);
462 gfs2_statfs_change_in(m_sc, m_bh->b_data +
463 sizeof(struct gfs2_dinode));
464 gfs2_statfs_change_in(l_sc, l_bh->b_data +
465 sizeof(struct gfs2_dinode));
466 spin_unlock(&sdp->sd_statfs_spin);
467
468 brelse(l_bh);
469 }
470
471out_m_bh:
472 brelse(m_bh);
473out:
474 gfs2_glock_dq_uninit(&gh);
475 return 0;
476}
477
478void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
479 s64 dinodes)
480{
481 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
482 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
483 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
484 struct buffer_head *l_bh;
485 s64 x, y;
486 int need_sync = 0;
487 int error;
488
489 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
490 if (error)
491 return;
492
493 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
494
495 spin_lock(&sdp->sd_statfs_spin);
496 l_sc->sc_total += total;
497 l_sc->sc_free += free;
498 l_sc->sc_dinodes += dinodes;
499 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
500 if (sdp->sd_args.ar_statfs_percent) {
501 x = 100 * l_sc->sc_free;
502 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
503 if (x >= y || x <= -y)
504 need_sync = 1;
505 }
506 spin_unlock(&sdp->sd_statfs_spin);
507
508 brelse(l_bh);
509 if (need_sync)
510 gfs2_wake_up_statfs(sdp);
511}
512
513void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
514 struct buffer_head *l_bh)
515{
516 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
517 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
518 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
519 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
520
521 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
522
523 spin_lock(&sdp->sd_statfs_spin);
524 m_sc->sc_total += l_sc->sc_total;
525 m_sc->sc_free += l_sc->sc_free;
526 m_sc->sc_dinodes += l_sc->sc_dinodes;
527 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
528 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
529 0, sizeof(struct gfs2_statfs_change));
530 spin_unlock(&sdp->sd_statfs_spin);
531
532 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
533 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
534}
535
536int gfs2_statfs_sync(struct super_block *sb, int type)
537{
538 struct gfs2_sbd *sdp = sb->s_fs_info;
539 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
540 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
541 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
542 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
543 struct gfs2_holder gh;
544 struct buffer_head *m_bh, *l_bh;
545 int error;
546
547 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
548 &gh);
549 if (error)
550 return error;
551
552 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
553 if (error)
554 goto out;
555
556 spin_lock(&sdp->sd_statfs_spin);
557 gfs2_statfs_change_in(m_sc, m_bh->b_data +
558 sizeof(struct gfs2_dinode));
559 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
560 spin_unlock(&sdp->sd_statfs_spin);
561 goto out_bh;
562 }
563 spin_unlock(&sdp->sd_statfs_spin);
564
565 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
566 if (error)
567 goto out_bh;
568
569 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
570 if (error)
571 goto out_bh2;
572
573 update_statfs(sdp, m_bh, l_bh);
574 sdp->sd_statfs_force_sync = 0;
575
576 gfs2_trans_end(sdp);
577
578out_bh2:
579 brelse(l_bh);
580out_bh:
581 brelse(m_bh);
582out:
583 gfs2_glock_dq_uninit(&gh);
584 return error;
585}
586
587struct lfcc {
588 struct list_head list;
589 struct gfs2_holder gh;
590};
591
592/**
593 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
594 * journals are clean
595 * @sdp: the file system
596 * @state: the state to put the transaction lock into
597 * @t_gh: the hold on the transaction lock
598 *
599 * Returns: errno
600 */
601
602static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
603 struct gfs2_holder *t_gh)
604{
605 struct gfs2_inode *ip;
606 struct gfs2_jdesc *jd;
607 struct lfcc *lfcc;
608 LIST_HEAD(list);
609 struct gfs2_log_header_host lh;
610 int error;
611
612 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
613 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
614 if (!lfcc) {
615 error = -ENOMEM;
616 goto out;
617 }
618 ip = GFS2_I(jd->jd_inode);
619 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
620 if (error) {
621 kfree(lfcc);
622 goto out;
623 }
624 list_add(&lfcc->list, &list);
625 }
626
627 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
628 GL_NOCACHE, t_gh);
629
630 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
631 error = gfs2_jdesc_check(jd);
632 if (error)
633 break;
634 error = gfs2_find_jhead(jd, &lh);
635 if (error)
636 break;
637 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
638 error = -EBUSY;
639 break;
640 }
641 }
642
643 if (error)
644 gfs2_glock_dq_uninit(t_gh);
645
646out:
647 while (!list_empty(&list)) {
648 lfcc = list_entry(list.next, struct lfcc, list);
649 list_del(&lfcc->list);
650 gfs2_glock_dq_uninit(&lfcc->gh);
651 kfree(lfcc);
652 }
653 return error;
654}
655
656/**
657 * gfs2_freeze_fs - freezes the file system
658 * @sdp: the file system
659 *
660 * This function flushes data and meta data for all machines by
661 * acquiring the transaction log exclusively. All journals are
662 * ensured to be in a clean state as well.
663 *
664 * Returns: errno
665 */
666
667int gfs2_freeze_fs(struct gfs2_sbd *sdp)
668{
669 int error = 0;
670
671 mutex_lock(&sdp->sd_freeze_lock);
672
673 if (!sdp->sd_freeze_count++) {
674 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
675 if (error)
676 sdp->sd_freeze_count--;
677 }
678
679 mutex_unlock(&sdp->sd_freeze_lock);
680
681 return error;
682}
683
684/**
685 * gfs2_unfreeze_fs - unfreezes the file system
686 * @sdp: the file system
687 *
688 * This function allows the file system to proceed by unlocking
689 * the exclusively held transaction lock. Other GFS2 nodes are
690 * now free to acquire the lock shared and go on with their lives.
691 *
692 */
693
694void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
695{
696 mutex_lock(&sdp->sd_freeze_lock);
697
698 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
699 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
700
701 mutex_unlock(&sdp->sd_freeze_lock);
702}
703
704void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
705{
706 struct gfs2_dinode *str = buf;
707
708 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
709 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
710 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
711 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
712 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
713 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
714 str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
715 str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
716 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
717 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
718 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
719 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
720 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
721 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
722
723 str->di_goal_meta = cpu_to_be64(ip->i_goal);
724 str->di_goal_data = cpu_to_be64(ip->i_goal);
725 str->di_generation = cpu_to_be64(ip->i_generation);
726
727 str->di_flags = cpu_to_be32(ip->i_diskflags);
728 str->di_height = cpu_to_be16(ip->i_height);
729 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
730 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
731 GFS2_FORMAT_DE : 0);
732 str->di_depth = cpu_to_be16(ip->i_depth);
733 str->di_entries = cpu_to_be32(ip->i_entries);
734
735 str->di_eattr = cpu_to_be64(ip->i_eattr);
736 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
737 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
738 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
739}
740
741/**
742 * gfs2_write_inode - Make sure the inode is stable on the disk
743 * @inode: The inode
744 * @wbc: The writeback control structure
745 *
746 * Returns: errno
747 */
748
749static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
750{
751 struct gfs2_inode *ip = GFS2_I(inode);
752 struct gfs2_sbd *sdp = GFS2_SB(inode);
753 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
754 struct backing_dev_info *bdi = metamapping->backing_dev_info;
755 struct gfs2_holder gh;
756 struct buffer_head *bh;
757 struct timespec atime;
758 struct gfs2_dinode *di;
759 int ret = -EAGAIN;
760 int unlock_required = 0;
761
762 /* Skip timestamp update, if this is from a memalloc */
763 if (current->flags & PF_MEMALLOC)
764 goto do_flush;
765 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
766 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
767 if (ret)
768 goto do_flush;
769 unlock_required = 1;
770 }
771 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
772 if (ret)
773 goto do_unlock;
774 ret = gfs2_meta_inode_buffer(ip, &bh);
775 if (ret == 0) {
776 di = (struct gfs2_dinode *)bh->b_data;
777 atime.tv_sec = be64_to_cpu(di->di_atime);
778 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
779 if (timespec_compare(&inode->i_atime, &atime) > 0) {
780 gfs2_trans_add_bh(ip->i_gl, bh, 1);
781 gfs2_dinode_out(ip, bh->b_data);
782 }
783 brelse(bh);
784 }
785 gfs2_trans_end(sdp);
786do_unlock:
787 if (unlock_required)
788 gfs2_glock_dq_uninit(&gh);
789do_flush:
790 if (wbc->sync_mode == WB_SYNC_ALL)
791 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
792 filemap_fdatawrite(metamapping);
793 if (bdi->dirty_exceeded)
794 gfs2_ail1_flush(sdp, wbc);
795 if (!ret && (wbc->sync_mode == WB_SYNC_ALL))
796 ret = filemap_fdatawait(metamapping);
797 if (ret)
798 mark_inode_dirty_sync(inode);
799 return ret;
800}
801
802/**
803 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
804 * @sdp: the filesystem
805 *
806 * Returns: errno
807 */
808
809static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
810{
811 struct gfs2_holder t_gh;
812 int error;
813
814 flush_workqueue(gfs2_delete_workqueue);
815 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
816 gfs2_statfs_sync(sdp->sd_vfs, 0);
817
818 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
819 &t_gh);
820 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
821 return error;
822
823 gfs2_meta_syncfs(sdp);
824 gfs2_log_shutdown(sdp);
825
826 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
827
828 if (t_gh.gh_gl)
829 gfs2_glock_dq_uninit(&t_gh);
830
831 gfs2_quota_cleanup(sdp);
832
833 return error;
834}
835
836static int gfs2_umount_recovery_wait(void *word)
837{
838 schedule();
839 return 0;
840}
841
842/**
843 * gfs2_put_super - Unmount the filesystem
844 * @sb: The VFS superblock
845 *
846 */
847
848static void gfs2_put_super(struct super_block *sb)
849{
850 struct gfs2_sbd *sdp = sb->s_fs_info;
851 int error;
852 struct gfs2_jdesc *jd;
853
854 /* Unfreeze the filesystem, if we need to */
855
856 mutex_lock(&sdp->sd_freeze_lock);
857 if (sdp->sd_freeze_count)
858 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
859 mutex_unlock(&sdp->sd_freeze_lock);
860
861 /* No more recovery requests */
862 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
863 smp_mb();
864
865 /* Wait on outstanding recovery */
866restart:
867 spin_lock(&sdp->sd_jindex_spin);
868 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
869 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
870 continue;
871 spin_unlock(&sdp->sd_jindex_spin);
872 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
873 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
874 goto restart;
875 }
876 spin_unlock(&sdp->sd_jindex_spin);
877
878 kthread_stop(sdp->sd_quotad_process);
879 kthread_stop(sdp->sd_logd_process);
880
881 if (!(sb->s_flags & MS_RDONLY)) {
882 error = gfs2_make_fs_ro(sdp);
883 if (error)
884 gfs2_io_error(sdp);
885 }
886 /* At this point, we're through modifying the disk */
887
888 /* Release stuff */
889
890 iput(sdp->sd_jindex);
891 iput(sdp->sd_statfs_inode);
892 iput(sdp->sd_rindex);
893 iput(sdp->sd_quota_inode);
894
895 gfs2_glock_put(sdp->sd_rename_gl);
896 gfs2_glock_put(sdp->sd_trans_gl);
897
898 if (!sdp->sd_args.ar_spectator) {
899 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
900 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
901 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
902 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
903 iput(sdp->sd_sc_inode);
904 iput(sdp->sd_qc_inode);
905 }
906
907 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
908 gfs2_clear_rgrpd(sdp);
909 gfs2_jindex_free(sdp);
910 /* Take apart glock structures and buffer lists */
911 gfs2_gl_hash_clear(sdp);
912 /* Unmount the locking protocol */
913 gfs2_lm_unmount(sdp);
914
915 /* At this point, we're through participating in the lockspace */
916 gfs2_sys_fs_del(sdp);
917}
918
919/**
920 * gfs2_sync_fs - sync the filesystem
921 * @sb: the superblock
922 *
923 * Flushes the log to disk.
924 */
925
926static int gfs2_sync_fs(struct super_block *sb, int wait)
927{
928 struct gfs2_sbd *sdp = sb->s_fs_info;
929 if (wait && sdp)
930 gfs2_log_flush(sdp, NULL);
931 return 0;
932}
933
934/**
935 * gfs2_freeze - prevent further writes to the filesystem
936 * @sb: the VFS structure for the filesystem
937 *
938 */
939
940static int gfs2_freeze(struct super_block *sb)
941{
942 struct gfs2_sbd *sdp = sb->s_fs_info;
943 int error;
944
945 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
946 return -EINVAL;
947
948 for (;;) {
949 error = gfs2_freeze_fs(sdp);
950 if (!error)
951 break;
952
953 switch (error) {
954 case -EBUSY:
955 fs_err(sdp, "waiting for recovery before freeze\n");
956 break;
957
958 default:
959 fs_err(sdp, "error freezing FS: %d\n", error);
960 break;
961 }
962
963 fs_err(sdp, "retrying...\n");
964 msleep(1000);
965 }
966 return 0;
967}
968
969/**
970 * gfs2_unfreeze - reallow writes to the filesystem
971 * @sb: the VFS structure for the filesystem
972 *
973 */
974
975static int gfs2_unfreeze(struct super_block *sb)
976{
977 gfs2_unfreeze_fs(sb->s_fs_info);
978 return 0;
979}
980
981/**
982 * statfs_fill - fill in the sg for a given RG
983 * @rgd: the RG
984 * @sc: the sc structure
985 *
986 * Returns: 0 on success, -ESTALE if the LVB is invalid
987 */
988
989static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
990 struct gfs2_statfs_change_host *sc)
991{
992 gfs2_rgrp_verify(rgd);
993 sc->sc_total += rgd->rd_data;
994 sc->sc_free += rgd->rd_free;
995 sc->sc_dinodes += rgd->rd_dinodes;
996 return 0;
997}
998
999/**
1000 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1001 * @sdp: the filesystem
1002 * @sc: the sc info that will be returned
1003 *
1004 * Any error (other than a signal) will cause this routine to fall back
1005 * to the synchronous version.
1006 *
1007 * FIXME: This really shouldn't busy wait like this.
1008 *
1009 * Returns: errno
1010 */
1011
1012static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1013{
1014 struct gfs2_holder ri_gh;
1015 struct gfs2_rgrpd *rgd_next;
1016 struct gfs2_holder *gha, *gh;
1017 unsigned int slots = 64;
1018 unsigned int x;
1019 int done;
1020 int error = 0, err;
1021
1022 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1023 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1024 if (!gha)
1025 return -ENOMEM;
1026
1027 error = gfs2_rindex_hold(sdp, &ri_gh);
1028 if (error)
1029 goto out;
1030
1031 rgd_next = gfs2_rgrpd_get_first(sdp);
1032
1033 for (;;) {
1034 done = 1;
1035
1036 for (x = 0; x < slots; x++) {
1037 gh = gha + x;
1038
1039 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1040 err = gfs2_glock_wait(gh);
1041 if (err) {
1042 gfs2_holder_uninit(gh);
1043 error = err;
1044 } else {
1045 if (!error)
1046 error = statfs_slow_fill(
1047 gh->gh_gl->gl_object, sc);
1048 gfs2_glock_dq_uninit(gh);
1049 }
1050 }
1051
1052 if (gh->gh_gl)
1053 done = 0;
1054 else if (rgd_next && !error) {
1055 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1056 LM_ST_SHARED,
1057 GL_ASYNC,
1058 gh);
1059 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1060 done = 0;
1061 }
1062
1063 if (signal_pending(current))
1064 error = -ERESTARTSYS;
1065 }
1066
1067 if (done)
1068 break;
1069
1070 yield();
1071 }
1072
1073 gfs2_glock_dq_uninit(&ri_gh);
1074
1075out:
1076 kfree(gha);
1077 return error;
1078}
1079
1080/**
1081 * gfs2_statfs_i - Do a statfs
1082 * @sdp: the filesystem
1083 * @sg: the sg structure
1084 *
1085 * Returns: errno
1086 */
1087
1088static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1089{
1090 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1091 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1092
1093 spin_lock(&sdp->sd_statfs_spin);
1094
1095 *sc = *m_sc;
1096 sc->sc_total += l_sc->sc_total;
1097 sc->sc_free += l_sc->sc_free;
1098 sc->sc_dinodes += l_sc->sc_dinodes;
1099
1100 spin_unlock(&sdp->sd_statfs_spin);
1101
1102 if (sc->sc_free < 0)
1103 sc->sc_free = 0;
1104 if (sc->sc_free > sc->sc_total)
1105 sc->sc_free = sc->sc_total;
1106 if (sc->sc_dinodes < 0)
1107 sc->sc_dinodes = 0;
1108
1109 return 0;
1110}
1111
1112/**
1113 * gfs2_statfs - Gather and return stats about the filesystem
1114 * @sb: The superblock
1115 * @statfsbuf: The buffer
1116 *
1117 * Returns: 0 on success or error code
1118 */
1119
1120static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1121{
1122 struct super_block *sb = dentry->d_inode->i_sb;
1123 struct gfs2_sbd *sdp = sb->s_fs_info;
1124 struct gfs2_statfs_change_host sc;
1125 int error;
1126
1127 if (gfs2_tune_get(sdp, gt_statfs_slow))
1128 error = gfs2_statfs_slow(sdp, &sc);
1129 else
1130 error = gfs2_statfs_i(sdp, &sc);
1131
1132 if (error)
1133 return error;
1134
1135 buf->f_type = GFS2_MAGIC;
1136 buf->f_bsize = sdp->sd_sb.sb_bsize;
1137 buf->f_blocks = sc.sc_total;
1138 buf->f_bfree = sc.sc_free;
1139 buf->f_bavail = sc.sc_free;
1140 buf->f_files = sc.sc_dinodes + sc.sc_free;
1141 buf->f_ffree = sc.sc_free;
1142 buf->f_namelen = GFS2_FNAMESIZE;
1143
1144 return 0;
1145}
1146
1147/**
1148 * gfs2_remount_fs - called when the FS is remounted
1149 * @sb: the filesystem
1150 * @flags: the remount flags
1151 * @data: extra data passed in (not used right now)
1152 *
1153 * Returns: errno
1154 */
1155
1156static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1157{
1158 struct gfs2_sbd *sdp = sb->s_fs_info;
1159 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1160 struct gfs2_tune *gt = &sdp->sd_tune;
1161 int error;
1162
1163 spin_lock(>->gt_spin);
1164 args.ar_commit = gt->gt_logd_secs;
1165 args.ar_quota_quantum = gt->gt_quota_quantum;
1166 if (gt->gt_statfs_slow)
1167 args.ar_statfs_quantum = 0;
1168 else
1169 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1170 spin_unlock(>->gt_spin);
1171 error = gfs2_mount_args(&args, data);
1172 if (error)
1173 return error;
1174
1175 /* Not allowed to change locking details */
1176 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1177 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1178 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1179 return -EINVAL;
1180
1181 /* Some flags must not be changed */
1182 if (args_neq(&args, &sdp->sd_args, spectator) ||
1183 args_neq(&args, &sdp->sd_args, localflocks) ||
1184 args_neq(&args, &sdp->sd_args, meta))
1185 return -EINVAL;
1186
1187 if (sdp->sd_args.ar_spectator)
1188 *flags |= MS_RDONLY;
1189
1190 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1191 if (*flags & MS_RDONLY)
1192 error = gfs2_make_fs_ro(sdp);
1193 else
1194 error = gfs2_make_fs_rw(sdp);
1195 if (error)
1196 return error;
1197 }
1198
1199 sdp->sd_args = args;
1200 if (sdp->sd_args.ar_posix_acl)
1201 sb->s_flags |= MS_POSIXACL;
1202 else
1203 sb->s_flags &= ~MS_POSIXACL;
1204 if (sdp->sd_args.ar_nobarrier)
1205 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1206 else
1207 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1208 spin_lock(>->gt_spin);
1209 gt->gt_logd_secs = args.ar_commit;
1210 gt->gt_quota_quantum = args.ar_quota_quantum;
1211 if (args.ar_statfs_quantum) {
1212 gt->gt_statfs_slow = 0;
1213 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1214 }
1215 else {
1216 gt->gt_statfs_slow = 1;
1217 gt->gt_statfs_quantum = 30;
1218 }
1219 spin_unlock(>->gt_spin);
1220
1221 gfs2_online_uevent(sdp);
1222 return 0;
1223}
1224
1225/**
1226 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1227 * @inode: The inode to drop
1228 *
1229 * If we've received a callback on an iopen lock then its because a
1230 * remote node tried to deallocate the inode but failed due to this node
1231 * still having the inode open. Here we mark the link count zero
1232 * since we know that it must have reached zero if the GLF_DEMOTE flag
1233 * is set on the iopen glock. If we didn't do a disk read since the
1234 * remote node removed the final link then we might otherwise miss
1235 * this event. This check ensures that this node will deallocate the
1236 * inode's blocks, or alternatively pass the baton on to another
1237 * node for later deallocation.
1238 */
1239
1240static int gfs2_drop_inode(struct inode *inode)
1241{
1242 struct gfs2_inode *ip = GFS2_I(inode);
1243
1244 if (inode->i_nlink) {
1245 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1246 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1247 clear_nlink(inode);
1248 }
1249 return generic_drop_inode(inode);
1250}
1251
1252static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1253{
1254 do {
1255 if (d1 == d2)
1256 return 1;
1257 d1 = d1->d_parent;
1258 } while (!IS_ROOT(d1));
1259 return 0;
1260}
1261
1262/**
1263 * gfs2_show_options - Show mount options for /proc/mounts
1264 * @s: seq_file structure
1265 * @mnt: vfsmount
1266 *
1267 * Returns: 0 on success or error code
1268 */
1269
1270static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1271{
1272 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1273 struct gfs2_args *args = &sdp->sd_args;
1274 int val;
1275
1276 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1277 seq_printf(s, ",meta");
1278 if (args->ar_lockproto[0])
1279 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1280 if (args->ar_locktable[0])
1281 seq_printf(s, ",locktable=%s", args->ar_locktable);
1282 if (args->ar_hostdata[0])
1283 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1284 if (args->ar_spectator)
1285 seq_printf(s, ",spectator");
1286 if (args->ar_localflocks)
1287 seq_printf(s, ",localflocks");
1288 if (args->ar_debug)
1289 seq_printf(s, ",debug");
1290 if (args->ar_posix_acl)
1291 seq_printf(s, ",acl");
1292 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1293 char *state;
1294 switch (args->ar_quota) {
1295 case GFS2_QUOTA_OFF:
1296 state = "off";
1297 break;
1298 case GFS2_QUOTA_ACCOUNT:
1299 state = "account";
1300 break;
1301 case GFS2_QUOTA_ON:
1302 state = "on";
1303 break;
1304 default:
1305 state = "unknown";
1306 break;
1307 }
1308 seq_printf(s, ",quota=%s", state);
1309 }
1310 if (args->ar_suiddir)
1311 seq_printf(s, ",suiddir");
1312 if (args->ar_data != GFS2_DATA_DEFAULT) {
1313 char *state;
1314 switch (args->ar_data) {
1315 case GFS2_DATA_WRITEBACK:
1316 state = "writeback";
1317 break;
1318 case GFS2_DATA_ORDERED:
1319 state = "ordered";
1320 break;
1321 default:
1322 state = "unknown";
1323 break;
1324 }
1325 seq_printf(s, ",data=%s", state);
1326 }
1327 if (args->ar_discard)
1328 seq_printf(s, ",discard");
1329 val = sdp->sd_tune.gt_logd_secs;
1330 if (val != 30)
1331 seq_printf(s, ",commit=%d", val);
1332 val = sdp->sd_tune.gt_statfs_quantum;
1333 if (val != 30)
1334 seq_printf(s, ",statfs_quantum=%d", val);
1335 val = sdp->sd_tune.gt_quota_quantum;
1336 if (val != 60)
1337 seq_printf(s, ",quota_quantum=%d", val);
1338 if (args->ar_statfs_percent)
1339 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1340 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1341 const char *state;
1342
1343 switch (args->ar_errors) {
1344 case GFS2_ERRORS_WITHDRAW:
1345 state = "withdraw";
1346 break;
1347 case GFS2_ERRORS_PANIC:
1348 state = "panic";
1349 break;
1350 default:
1351 state = "unknown";
1352 break;
1353 }
1354 seq_printf(s, ",errors=%s", state);
1355 }
1356 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1357 seq_printf(s, ",nobarrier");
1358 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1359 seq_printf(s, ",demote_interface_used");
1360 return 0;
1361}
1362
1363static void gfs2_final_release_pages(struct gfs2_inode *ip)
1364{
1365 struct inode *inode = &ip->i_inode;
1366 struct gfs2_glock *gl = ip->i_gl;
1367
1368 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1369 truncate_inode_pages(&inode->i_data, 0);
1370
1371 if (atomic_read(&gl->gl_revokes) == 0) {
1372 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1373 clear_bit(GLF_DIRTY, &gl->gl_flags);
1374 }
1375}
1376
1377static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1378{
1379 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1380 struct gfs2_alloc *al;
1381 struct gfs2_rgrpd *rgd;
1382 int error;
1383
1384 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1385 gfs2_consist_inode(ip);
1386 return -EIO;
1387 }
1388
1389 al = gfs2_alloc_get(ip);
1390 if (!al)
1391 return -ENOMEM;
1392
1393 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1394 if (error)
1395 goto out;
1396
1397 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
1398 if (error)
1399 goto out_qs;
1400
1401 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1402 if (!rgd) {
1403 gfs2_consist_inode(ip);
1404 error = -EIO;
1405 goto out_rindex_relse;
1406 }
1407
1408 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1409 &al->al_rgd_gh);
1410 if (error)
1411 goto out_rindex_relse;
1412
1413 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1414 sdp->sd_jdesc->jd_blocks);
1415 if (error)
1416 goto out_rg_gunlock;
1417
1418 gfs2_free_di(rgd, ip);
1419
1420 gfs2_final_release_pages(ip);
1421
1422 gfs2_trans_end(sdp);
1423
1424out_rg_gunlock:
1425 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1426out_rindex_relse:
1427 gfs2_glock_dq_uninit(&al->al_ri_gh);
1428out_qs:
1429 gfs2_quota_unhold(ip);
1430out:
1431 gfs2_alloc_put(ip);
1432 return error;
1433}
1434
1435/**
1436 * gfs2_evict_inode - Remove an inode from cache
1437 * @inode: The inode to evict
1438 *
1439 * There are three cases to consider:
1440 * 1. i_nlink == 0, we are final opener (and must deallocate)
1441 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1442 * 3. i_nlink > 0
1443 *
1444 * If the fs is read only, then we have to treat all cases as per #3
1445 * since we are unable to do any deallocation. The inode will be
1446 * deallocated by the next read/write node to attempt an allocation
1447 * in the same resource group
1448 *
1449 * We have to (at the moment) hold the inodes main lock to cover
1450 * the gap between unlocking the shared lock on the iopen lock and
1451 * taking the exclusive lock. I'd rather do a shared -> exclusive
1452 * conversion on the iopen lock, but we can change that later. This
1453 * is safe, just less efficient.
1454 */
1455
1456static void gfs2_evict_inode(struct inode *inode)
1457{
1458 struct super_block *sb = inode->i_sb;
1459 struct gfs2_sbd *sdp = sb->s_fs_info;
1460 struct gfs2_inode *ip = GFS2_I(inode);
1461 struct gfs2_holder gh;
1462 int error;
1463
1464 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1465 goto out;
1466
1467 /* Must not read inode block until block type has been verified */
1468 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1469 if (unlikely(error)) {
1470 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1471 goto out;
1472 }
1473
1474 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1475 if (error)
1476 goto out_truncate;
1477
1478 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1479 error = gfs2_inode_refresh(ip);
1480 if (error)
1481 goto out_truncate;
1482 }
1483
1484 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1485 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1486 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1487 error = gfs2_glock_nq(&ip->i_iopen_gh);
1488 if (error)
1489 goto out_truncate;
1490
1491 /* Case 1 starts here */
1492
1493 if (S_ISDIR(inode->i_mode) &&
1494 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1495 error = gfs2_dir_exhash_dealloc(ip);
1496 if (error)
1497 goto out_unlock;
1498 }
1499
1500 if (ip->i_eattr) {
1501 error = gfs2_ea_dealloc(ip);
1502 if (error)
1503 goto out_unlock;
1504 }
1505
1506 if (!gfs2_is_stuffed(ip)) {
1507 error = gfs2_file_dealloc(ip);
1508 if (error)
1509 goto out_unlock;
1510 }
1511
1512 error = gfs2_dinode_dealloc(ip);
1513 goto out_unlock;
1514
1515out_truncate:
1516 /* Case 2 starts here */
1517 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1518 if (error)
1519 goto out_unlock;
1520 /* Needs to be done before glock release & also in a transaction */
1521 truncate_inode_pages(&inode->i_data, 0);
1522 gfs2_trans_end(sdp);
1523
1524out_unlock:
1525 /* Error path for case 1 */
1526 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1527 gfs2_glock_dq(&ip->i_iopen_gh);
1528 gfs2_holder_uninit(&ip->i_iopen_gh);
1529 gfs2_glock_dq_uninit(&gh);
1530 if (error && error != GLR_TRYFAILED && error != -EROFS)
1531 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1532out:
1533 /* Case 3 starts here */
1534 truncate_inode_pages(&inode->i_data, 0);
1535 end_writeback(inode);
1536 gfs2_dir_hash_inval(ip);
1537 ip->i_gl->gl_object = NULL;
1538 gfs2_glock_add_to_lru(ip->i_gl);
1539 gfs2_glock_put(ip->i_gl);
1540 ip->i_gl = NULL;
1541 if (ip->i_iopen_gh.gh_gl) {
1542 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1543 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1544 }
1545}
1546
1547static struct inode *gfs2_alloc_inode(struct super_block *sb)
1548{
1549 struct gfs2_inode *ip;
1550
1551 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1552 if (ip) {
1553 ip->i_flags = 0;
1554 ip->i_gl = NULL;
1555 }
1556 return &ip->i_inode;
1557}
1558
1559static void gfs2_i_callback(struct rcu_head *head)
1560{
1561 struct inode *inode = container_of(head, struct inode, i_rcu);
1562 INIT_LIST_HEAD(&inode->i_dentry);
1563 kmem_cache_free(gfs2_inode_cachep, inode);
1564}
1565
1566static void gfs2_destroy_inode(struct inode *inode)
1567{
1568 call_rcu(&inode->i_rcu, gfs2_i_callback);
1569}
1570
1571const struct super_operations gfs2_super_ops = {
1572 .alloc_inode = gfs2_alloc_inode,
1573 .destroy_inode = gfs2_destroy_inode,
1574 .write_inode = gfs2_write_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
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/bio.h>
13#include <linux/sched.h>
14#include <linux/slab.h>
15#include <linux/spinlock.h>
16#include <linux/completion.h>
17#include <linux/buffer_head.h>
18#include <linux/statfs.h>
19#include <linux/seq_file.h>
20#include <linux/mount.h>
21#include <linux/kthread.h>
22#include <linux/delay.h>
23#include <linux/gfs2_ondisk.h>
24#include <linux/crc32.h>
25#include <linux/time.h>
26#include <linux/wait.h>
27#include <linux/writeback.h>
28#include <linux/backing-dev.h>
29#include <linux/kernel.h>
30
31#include "gfs2.h"
32#include "incore.h"
33#include "bmap.h"
34#include "dir.h"
35#include "glock.h"
36#include "glops.h"
37#include "inode.h"
38#include "log.h"
39#include "meta_io.h"
40#include "quota.h"
41#include "recovery.h"
42#include "rgrp.h"
43#include "super.h"
44#include "trans.h"
45#include "util.h"
46#include "sys.h"
47#include "xattr.h"
48
49#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
50
51enum {
52 Opt_lockproto,
53 Opt_locktable,
54 Opt_hostdata,
55 Opt_spectator,
56 Opt_ignore_local_fs,
57 Opt_localflocks,
58 Opt_localcaching,
59 Opt_debug,
60 Opt_nodebug,
61 Opt_upgrade,
62 Opt_acl,
63 Opt_noacl,
64 Opt_quota_off,
65 Opt_quota_account,
66 Opt_quota_on,
67 Opt_quota,
68 Opt_noquota,
69 Opt_suiddir,
70 Opt_nosuiddir,
71 Opt_data_writeback,
72 Opt_data_ordered,
73 Opt_meta,
74 Opt_discard,
75 Opt_nodiscard,
76 Opt_commit,
77 Opt_err_withdraw,
78 Opt_err_panic,
79 Opt_statfs_quantum,
80 Opt_statfs_percent,
81 Opt_quota_quantum,
82 Opt_barrier,
83 Opt_nobarrier,
84 Opt_rgrplvb,
85 Opt_norgrplvb,
86 Opt_loccookie,
87 Opt_noloccookie,
88 Opt_error,
89};
90
91static const match_table_t tokens = {
92 {Opt_lockproto, "lockproto=%s"},
93 {Opt_locktable, "locktable=%s"},
94 {Opt_hostdata, "hostdata=%s"},
95 {Opt_spectator, "spectator"},
96 {Opt_spectator, "norecovery"},
97 {Opt_ignore_local_fs, "ignore_local_fs"},
98 {Opt_localflocks, "localflocks"},
99 {Opt_localcaching, "localcaching"},
100 {Opt_debug, "debug"},
101 {Opt_nodebug, "nodebug"},
102 {Opt_upgrade, "upgrade"},
103 {Opt_acl, "acl"},
104 {Opt_noacl, "noacl"},
105 {Opt_quota_off, "quota=off"},
106 {Opt_quota_account, "quota=account"},
107 {Opt_quota_on, "quota=on"},
108 {Opt_quota, "quota"},
109 {Opt_noquota, "noquota"},
110 {Opt_suiddir, "suiddir"},
111 {Opt_nosuiddir, "nosuiddir"},
112 {Opt_data_writeback, "data=writeback"},
113 {Opt_data_ordered, "data=ordered"},
114 {Opt_meta, "meta"},
115 {Opt_discard, "discard"},
116 {Opt_nodiscard, "nodiscard"},
117 {Opt_commit, "commit=%d"},
118 {Opt_err_withdraw, "errors=withdraw"},
119 {Opt_err_panic, "errors=panic"},
120 {Opt_statfs_quantum, "statfs_quantum=%d"},
121 {Opt_statfs_percent, "statfs_percent=%d"},
122 {Opt_quota_quantum, "quota_quantum=%d"},
123 {Opt_barrier, "barrier"},
124 {Opt_nobarrier, "nobarrier"},
125 {Opt_rgrplvb, "rgrplvb"},
126 {Opt_norgrplvb, "norgrplvb"},
127 {Opt_loccookie, "loccookie"},
128 {Opt_noloccookie, "noloccookie"},
129 {Opt_error, NULL}
130};
131
132/**
133 * gfs2_mount_args - Parse mount options
134 * @args: The structure into which the parsed options will be written
135 * @options: The options to parse
136 *
137 * Return: errno
138 */
139
140int gfs2_mount_args(struct gfs2_args *args, char *options)
141{
142 char *o;
143 int token;
144 substring_t tmp[MAX_OPT_ARGS];
145 int rv;
146
147 /* Split the options into tokens with the "," character and
148 process them */
149
150 while (1) {
151 o = strsep(&options, ",");
152 if (o == NULL)
153 break;
154 if (*o == '\0')
155 continue;
156
157 token = match_token(o, tokens, tmp);
158 switch (token) {
159 case Opt_lockproto:
160 match_strlcpy(args->ar_lockproto, &tmp[0],
161 GFS2_LOCKNAME_LEN);
162 break;
163 case Opt_locktable:
164 match_strlcpy(args->ar_locktable, &tmp[0],
165 GFS2_LOCKNAME_LEN);
166 break;
167 case Opt_hostdata:
168 match_strlcpy(args->ar_hostdata, &tmp[0],
169 GFS2_LOCKNAME_LEN);
170 break;
171 case Opt_spectator:
172 args->ar_spectator = 1;
173 break;
174 case Opt_ignore_local_fs:
175 /* Retained for backwards compat only */
176 break;
177 case Opt_localflocks:
178 args->ar_localflocks = 1;
179 break;
180 case Opt_localcaching:
181 /* Retained for backwards compat only */
182 break;
183 case Opt_debug:
184 if (args->ar_errors == GFS2_ERRORS_PANIC) {
185 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
186 return -EINVAL;
187 }
188 args->ar_debug = 1;
189 break;
190 case Opt_nodebug:
191 args->ar_debug = 0;
192 break;
193 case Opt_upgrade:
194 /* Retained for backwards compat only */
195 break;
196 case Opt_acl:
197 args->ar_posix_acl = 1;
198 break;
199 case Opt_noacl:
200 args->ar_posix_acl = 0;
201 break;
202 case Opt_quota_off:
203 case Opt_noquota:
204 args->ar_quota = GFS2_QUOTA_OFF;
205 break;
206 case Opt_quota_account:
207 args->ar_quota = GFS2_QUOTA_ACCOUNT;
208 break;
209 case Opt_quota_on:
210 case Opt_quota:
211 args->ar_quota = GFS2_QUOTA_ON;
212 break;
213 case Opt_suiddir:
214 args->ar_suiddir = 1;
215 break;
216 case Opt_nosuiddir:
217 args->ar_suiddir = 0;
218 break;
219 case Opt_data_writeback:
220 args->ar_data = GFS2_DATA_WRITEBACK;
221 break;
222 case Opt_data_ordered:
223 args->ar_data = GFS2_DATA_ORDERED;
224 break;
225 case Opt_meta:
226 args->ar_meta = 1;
227 break;
228 case Opt_discard:
229 args->ar_discard = 1;
230 break;
231 case Opt_nodiscard:
232 args->ar_discard = 0;
233 break;
234 case Opt_commit:
235 rv = match_int(&tmp[0], &args->ar_commit);
236 if (rv || args->ar_commit <= 0) {
237 pr_warn("commit mount option requires a positive numeric argument\n");
238 return rv ? rv : -EINVAL;
239 }
240 break;
241 case Opt_statfs_quantum:
242 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
243 if (rv || args->ar_statfs_quantum < 0) {
244 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
245 return rv ? rv : -EINVAL;
246 }
247 break;
248 case Opt_quota_quantum:
249 rv = match_int(&tmp[0], &args->ar_quota_quantum);
250 if (rv || args->ar_quota_quantum <= 0) {
251 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
252 return rv ? rv : -EINVAL;
253 }
254 break;
255 case Opt_statfs_percent:
256 rv = match_int(&tmp[0], &args->ar_statfs_percent);
257 if (rv || args->ar_statfs_percent < 0 ||
258 args->ar_statfs_percent > 100) {
259 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
260 return rv ? rv : -EINVAL;
261 }
262 break;
263 case Opt_err_withdraw:
264 args->ar_errors = GFS2_ERRORS_WITHDRAW;
265 break;
266 case Opt_err_panic:
267 if (args->ar_debug) {
268 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
269 return -EINVAL;
270 }
271 args->ar_errors = GFS2_ERRORS_PANIC;
272 break;
273 case Opt_barrier:
274 args->ar_nobarrier = 0;
275 break;
276 case Opt_nobarrier:
277 args->ar_nobarrier = 1;
278 break;
279 case Opt_rgrplvb:
280 args->ar_rgrplvb = 1;
281 break;
282 case Opt_norgrplvb:
283 args->ar_rgrplvb = 0;
284 break;
285 case Opt_loccookie:
286 args->ar_loccookie = 1;
287 break;
288 case Opt_noloccookie:
289 args->ar_loccookie = 0;
290 break;
291 case Opt_error:
292 default:
293 pr_warn("invalid mount option: %s\n", o);
294 return -EINVAL;
295 }
296 }
297
298 return 0;
299}
300
301/**
302 * gfs2_jindex_free - Clear all the journal index information
303 * @sdp: The GFS2 superblock
304 *
305 */
306
307void gfs2_jindex_free(struct gfs2_sbd *sdp)
308{
309 struct list_head list;
310 struct gfs2_jdesc *jd;
311
312 spin_lock(&sdp->sd_jindex_spin);
313 list_add(&list, &sdp->sd_jindex_list);
314 list_del_init(&sdp->sd_jindex_list);
315 sdp->sd_journals = 0;
316 spin_unlock(&sdp->sd_jindex_spin);
317
318 while (!list_empty(&list)) {
319 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
320 gfs2_free_journal_extents(jd);
321 list_del(&jd->jd_list);
322 iput(jd->jd_inode);
323 kfree(jd);
324 }
325}
326
327static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
328{
329 struct gfs2_jdesc *jd;
330 int found = 0;
331
332 list_for_each_entry(jd, head, jd_list) {
333 if (jd->jd_jid == jid) {
334 found = 1;
335 break;
336 }
337 }
338
339 if (!found)
340 jd = NULL;
341
342 return jd;
343}
344
345struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
346{
347 struct gfs2_jdesc *jd;
348
349 spin_lock(&sdp->sd_jindex_spin);
350 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
351 spin_unlock(&sdp->sd_jindex_spin);
352
353 return jd;
354}
355
356int gfs2_jdesc_check(struct gfs2_jdesc *jd)
357{
358 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
359 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
360 u64 size = i_size_read(jd->jd_inode);
361
362 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
363 return -EIO;
364
365 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
366
367 if (gfs2_write_alloc_required(ip, 0, size)) {
368 gfs2_consist_inode(ip);
369 return -EIO;
370 }
371
372 return 0;
373}
374
375static int init_threads(struct gfs2_sbd *sdp)
376{
377 struct task_struct *p;
378 int error = 0;
379
380 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
381 if (IS_ERR(p)) {
382 error = PTR_ERR(p);
383 fs_err(sdp, "can't start logd thread: %d\n", error);
384 return error;
385 }
386 sdp->sd_logd_process = p;
387
388 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
389 if (IS_ERR(p)) {
390 error = PTR_ERR(p);
391 fs_err(sdp, "can't start quotad thread: %d\n", error);
392 goto fail;
393 }
394 sdp->sd_quotad_process = p;
395 return 0;
396
397fail:
398 kthread_stop(sdp->sd_logd_process);
399 return error;
400}
401
402/**
403 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
404 * @sdp: the filesystem
405 *
406 * Returns: errno
407 */
408
409int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
410{
411 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
412 struct gfs2_glock *j_gl = ip->i_gl;
413 struct gfs2_holder freeze_gh;
414 struct gfs2_log_header_host head;
415 int error;
416
417 error = init_threads(sdp);
418 if (error)
419 return error;
420
421 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
422 &freeze_gh);
423 if (error)
424 goto fail_threads;
425
426 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
427
428 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
429 if (error)
430 goto fail;
431
432 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
433 gfs2_consist(sdp);
434 error = -EIO;
435 goto fail;
436 }
437
438 /* Initialize some head of the log stuff */
439 sdp->sd_log_sequence = head.lh_sequence + 1;
440 gfs2_log_pointers_init(sdp, head.lh_blkno);
441
442 error = gfs2_quota_init(sdp);
443 if (error)
444 goto fail;
445
446 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
447
448 gfs2_glock_dq_uninit(&freeze_gh);
449
450 return 0;
451
452fail:
453 freeze_gh.gh_flags |= GL_NOCACHE;
454 gfs2_glock_dq_uninit(&freeze_gh);
455fail_threads:
456 kthread_stop(sdp->sd_quotad_process);
457 kthread_stop(sdp->sd_logd_process);
458 return error;
459}
460
461void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
462{
463 const struct gfs2_statfs_change *str = buf;
464
465 sc->sc_total = be64_to_cpu(str->sc_total);
466 sc->sc_free = be64_to_cpu(str->sc_free);
467 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
468}
469
470static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
471{
472 struct gfs2_statfs_change *str = buf;
473
474 str->sc_total = cpu_to_be64(sc->sc_total);
475 str->sc_free = cpu_to_be64(sc->sc_free);
476 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
477}
478
479int gfs2_statfs_init(struct gfs2_sbd *sdp)
480{
481 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
482 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
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 buffer_head *m_bh, *l_bh;
486 struct gfs2_holder gh;
487 int error;
488
489 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
490 &gh);
491 if (error)
492 return error;
493
494 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
495 if (error)
496 goto out;
497
498 if (sdp->sd_args.ar_spectator) {
499 spin_lock(&sdp->sd_statfs_spin);
500 gfs2_statfs_change_in(m_sc, m_bh->b_data +
501 sizeof(struct gfs2_dinode));
502 spin_unlock(&sdp->sd_statfs_spin);
503 } else {
504 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
505 if (error)
506 goto out_m_bh;
507
508 spin_lock(&sdp->sd_statfs_spin);
509 gfs2_statfs_change_in(m_sc, m_bh->b_data +
510 sizeof(struct gfs2_dinode));
511 gfs2_statfs_change_in(l_sc, l_bh->b_data +
512 sizeof(struct gfs2_dinode));
513 spin_unlock(&sdp->sd_statfs_spin);
514
515 brelse(l_bh);
516 }
517
518out_m_bh:
519 brelse(m_bh);
520out:
521 gfs2_glock_dq_uninit(&gh);
522 return 0;
523}
524
525void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
526 s64 dinodes)
527{
528 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
530 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
531 struct buffer_head *l_bh;
532 s64 x, y;
533 int need_sync = 0;
534 int error;
535
536 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
537 if (error)
538 return;
539
540 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
541
542 spin_lock(&sdp->sd_statfs_spin);
543 l_sc->sc_total += total;
544 l_sc->sc_free += free;
545 l_sc->sc_dinodes += dinodes;
546 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
547 if (sdp->sd_args.ar_statfs_percent) {
548 x = 100 * l_sc->sc_free;
549 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
550 if (x >= y || x <= -y)
551 need_sync = 1;
552 }
553 spin_unlock(&sdp->sd_statfs_spin);
554
555 brelse(l_bh);
556 if (need_sync)
557 gfs2_wake_up_statfs(sdp);
558}
559
560void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
561 struct buffer_head *l_bh)
562{
563 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
564 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
565 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
566 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
567
568 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
569 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
570
571 spin_lock(&sdp->sd_statfs_spin);
572 m_sc->sc_total += l_sc->sc_total;
573 m_sc->sc_free += l_sc->sc_free;
574 m_sc->sc_dinodes += l_sc->sc_dinodes;
575 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
576 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
577 0, sizeof(struct gfs2_statfs_change));
578 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
579 spin_unlock(&sdp->sd_statfs_spin);
580}
581
582int gfs2_statfs_sync(struct super_block *sb, int type)
583{
584 struct gfs2_sbd *sdp = sb->s_fs_info;
585 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
586 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
587 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
588 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
589 struct gfs2_holder gh;
590 struct buffer_head *m_bh, *l_bh;
591 int error;
592
593 sb_start_write(sb);
594 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
595 &gh);
596 if (error)
597 goto out;
598
599 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
600 if (error)
601 goto out_unlock;
602
603 spin_lock(&sdp->sd_statfs_spin);
604 gfs2_statfs_change_in(m_sc, m_bh->b_data +
605 sizeof(struct gfs2_dinode));
606 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
607 spin_unlock(&sdp->sd_statfs_spin);
608 goto out_bh;
609 }
610 spin_unlock(&sdp->sd_statfs_spin);
611
612 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
613 if (error)
614 goto out_bh;
615
616 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
617 if (error)
618 goto out_bh2;
619
620 update_statfs(sdp, m_bh, l_bh);
621 sdp->sd_statfs_force_sync = 0;
622
623 gfs2_trans_end(sdp);
624
625out_bh2:
626 brelse(l_bh);
627out_bh:
628 brelse(m_bh);
629out_unlock:
630 gfs2_glock_dq_uninit(&gh);
631out:
632 sb_end_write(sb);
633 return error;
634}
635
636struct lfcc {
637 struct list_head list;
638 struct gfs2_holder gh;
639};
640
641/**
642 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
643 * journals are clean
644 * @sdp: the file system
645 * @state: the state to put the transaction lock into
646 * @t_gh: the hold on the transaction lock
647 *
648 * Returns: errno
649 */
650
651static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
652 struct gfs2_holder *freeze_gh)
653{
654 struct gfs2_inode *ip;
655 struct gfs2_jdesc *jd;
656 struct lfcc *lfcc;
657 LIST_HEAD(list);
658 struct gfs2_log_header_host lh;
659 int error;
660
661 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
662 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
663 if (!lfcc) {
664 error = -ENOMEM;
665 goto out;
666 }
667 ip = GFS2_I(jd->jd_inode);
668 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
669 if (error) {
670 kfree(lfcc);
671 goto out;
672 }
673 list_add(&lfcc->list, &list);
674 }
675
676 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
677 GL_NOCACHE, freeze_gh);
678
679 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
680 error = gfs2_jdesc_check(jd);
681 if (error)
682 break;
683 error = gfs2_find_jhead(jd, &lh);
684 if (error)
685 break;
686 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
687 error = -EBUSY;
688 break;
689 }
690 }
691
692 if (error)
693 gfs2_glock_dq_uninit(freeze_gh);
694
695out:
696 while (!list_empty(&list)) {
697 lfcc = list_entry(list.next, struct lfcc, list);
698 list_del(&lfcc->list);
699 gfs2_glock_dq_uninit(&lfcc->gh);
700 kfree(lfcc);
701 }
702 return error;
703}
704
705void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
706{
707 struct gfs2_dinode *str = buf;
708
709 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
710 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
711 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
712 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
713 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
714 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
715 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
716 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
717 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
718 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
719 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
720 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
721 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
722 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
723
724 str->di_goal_meta = cpu_to_be64(ip->i_goal);
725 str->di_goal_data = cpu_to_be64(ip->i_goal);
726 str->di_generation = cpu_to_be64(ip->i_generation);
727
728 str->di_flags = cpu_to_be32(ip->i_diskflags);
729 str->di_height = cpu_to_be16(ip->i_height);
730 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
731 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
732 GFS2_FORMAT_DE : 0);
733 str->di_depth = cpu_to_be16(ip->i_depth);
734 str->di_entries = cpu_to_be32(ip->i_entries);
735
736 str->di_eattr = cpu_to_be64(ip->i_eattr);
737 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
738 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
739 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
740}
741
742/**
743 * gfs2_write_inode - Make sure the inode is stable on the disk
744 * @inode: The inode
745 * @wbc: The writeback control structure
746 *
747 * Returns: errno
748 */
749
750static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
751{
752 struct gfs2_inode *ip = GFS2_I(inode);
753 struct gfs2_sbd *sdp = GFS2_SB(inode);
754 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
755 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
756 int ret = 0;
757
758 if (wbc->sync_mode == WB_SYNC_ALL)
759 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
760 if (bdi->wb.dirty_exceeded)
761 gfs2_ail1_flush(sdp, wbc);
762 else
763 filemap_fdatawrite(metamapping);
764 if (wbc->sync_mode == WB_SYNC_ALL)
765 ret = filemap_fdatawait(metamapping);
766 if (ret)
767 mark_inode_dirty_sync(inode);
768 return ret;
769}
770
771/**
772 * gfs2_dirty_inode - check for atime updates
773 * @inode: The inode in question
774 * @flags: The type of dirty
775 *
776 * Unfortunately it can be called under any combination of inode
777 * glock and transaction lock, so we have to check carefully.
778 *
779 * At the moment this deals only with atime - it should be possible
780 * to expand that role in future, once a review of the locking has
781 * been carried out.
782 */
783
784static void gfs2_dirty_inode(struct inode *inode, int flags)
785{
786 struct gfs2_inode *ip = GFS2_I(inode);
787 struct gfs2_sbd *sdp = GFS2_SB(inode);
788 struct buffer_head *bh;
789 struct gfs2_holder gh;
790 int need_unlock = 0;
791 int need_endtrans = 0;
792 int ret;
793
794 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
795 return;
796
797 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
798 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
799 if (ret) {
800 fs_err(sdp, "dirty_inode: glock %d\n", ret);
801 return;
802 }
803 need_unlock = 1;
804 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
805 return;
806
807 if (current->journal_info == NULL) {
808 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
809 if (ret) {
810 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
811 goto out;
812 }
813 need_endtrans = 1;
814 }
815
816 ret = gfs2_meta_inode_buffer(ip, &bh);
817 if (ret == 0) {
818 gfs2_trans_add_meta(ip->i_gl, bh);
819 gfs2_dinode_out(ip, bh->b_data);
820 brelse(bh);
821 }
822
823 if (need_endtrans)
824 gfs2_trans_end(sdp);
825out:
826 if (need_unlock)
827 gfs2_glock_dq_uninit(&gh);
828}
829
830/**
831 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
832 * @sdp: the filesystem
833 *
834 * Returns: errno
835 */
836
837static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
838{
839 struct gfs2_holder freeze_gh;
840 int error;
841
842 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
843 &freeze_gh);
844 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
845 return error;
846
847 kthread_stop(sdp->sd_quotad_process);
848 kthread_stop(sdp->sd_logd_process);
849
850 flush_workqueue(gfs2_delete_workqueue);
851 gfs2_quota_sync(sdp->sd_vfs, 0);
852 gfs2_statfs_sync(sdp->sd_vfs, 0);
853
854 gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
855 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
856 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
857
858 if (freeze_gh.gh_gl)
859 gfs2_glock_dq_uninit(&freeze_gh);
860
861 gfs2_quota_cleanup(sdp);
862
863 return error;
864}
865
866/**
867 * gfs2_put_super - Unmount the filesystem
868 * @sb: The VFS superblock
869 *
870 */
871
872static void gfs2_put_super(struct super_block *sb)
873{
874 struct gfs2_sbd *sdp = sb->s_fs_info;
875 int error;
876 struct gfs2_jdesc *jd;
877
878 /* No more recovery requests */
879 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
880 smp_mb();
881
882 /* Wait on outstanding recovery */
883restart:
884 spin_lock(&sdp->sd_jindex_spin);
885 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
886 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
887 continue;
888 spin_unlock(&sdp->sd_jindex_spin);
889 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
890 TASK_UNINTERRUPTIBLE);
891 goto restart;
892 }
893 spin_unlock(&sdp->sd_jindex_spin);
894
895 if (!(sb->s_flags & MS_RDONLY)) {
896 error = gfs2_make_fs_ro(sdp);
897 if (error)
898 gfs2_io_error(sdp);
899 }
900 /* At this point, we're through modifying the disk */
901
902 /* Release stuff */
903
904 iput(sdp->sd_jindex);
905 iput(sdp->sd_statfs_inode);
906 iput(sdp->sd_rindex);
907 iput(sdp->sd_quota_inode);
908
909 gfs2_glock_put(sdp->sd_rename_gl);
910 gfs2_glock_put(sdp->sd_freeze_gl);
911
912 if (!sdp->sd_args.ar_spectator) {
913 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
914 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
915 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
916 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
917 iput(sdp->sd_sc_inode);
918 iput(sdp->sd_qc_inode);
919 }
920
921 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
922 gfs2_clear_rgrpd(sdp);
923 gfs2_jindex_free(sdp);
924 /* Take apart glock structures and buffer lists */
925 gfs2_gl_hash_clear(sdp);
926 /* Unmount the locking protocol */
927 gfs2_lm_unmount(sdp);
928
929 /* At this point, we're through participating in the lockspace */
930 gfs2_sys_fs_del(sdp);
931}
932
933/**
934 * gfs2_sync_fs - sync the filesystem
935 * @sb: the superblock
936 *
937 * Flushes the log to disk.
938 */
939
940static int gfs2_sync_fs(struct super_block *sb, int wait)
941{
942 struct gfs2_sbd *sdp = sb->s_fs_info;
943
944 gfs2_quota_sync(sb, -1);
945 if (wait && sdp)
946 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
947 return 0;
948}
949
950void gfs2_freeze_func(struct work_struct *work)
951{
952 int error;
953 struct gfs2_holder freeze_gh;
954 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
955 struct super_block *sb = sdp->sd_vfs;
956
957 atomic_inc(&sb->s_active);
958 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
959 &freeze_gh);
960 if (error) {
961 printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
962 gfs2_assert_withdraw(sdp, 0);
963 }
964 else {
965 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
966 error = thaw_super(sb);
967 if (error) {
968 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
969 error);
970 gfs2_assert_withdraw(sdp, 0);
971 }
972 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
973 freeze_gh.gh_flags |= GL_NOCACHE;
974 gfs2_glock_dq_uninit(&freeze_gh);
975 }
976 deactivate_super(sb);
977 return;
978}
979
980/**
981 * gfs2_freeze - prevent further writes to the filesystem
982 * @sb: the VFS structure for the filesystem
983 *
984 */
985
986static int gfs2_freeze(struct super_block *sb)
987{
988 struct gfs2_sbd *sdp = sb->s_fs_info;
989 int error = 0;
990
991 mutex_lock(&sdp->sd_freeze_mutex);
992 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
993 goto out;
994
995 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
996 error = -EINVAL;
997 goto out;
998 }
999
1000 for (;;) {
1001 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1002 if (!error)
1003 break;
1004
1005 switch (error) {
1006 case -EBUSY:
1007 fs_err(sdp, "waiting for recovery before freeze\n");
1008 break;
1009
1010 default:
1011 fs_err(sdp, "error freezing FS: %d\n", error);
1012 break;
1013 }
1014
1015 fs_err(sdp, "retrying...\n");
1016 msleep(1000);
1017 }
1018 error = 0;
1019out:
1020 mutex_unlock(&sdp->sd_freeze_mutex);
1021 return error;
1022}
1023
1024/**
1025 * gfs2_unfreeze - reallow writes to the filesystem
1026 * @sb: the VFS structure for the filesystem
1027 *
1028 */
1029
1030static int gfs2_unfreeze(struct super_block *sb)
1031{
1032 struct gfs2_sbd *sdp = sb->s_fs_info;
1033
1034 mutex_lock(&sdp->sd_freeze_mutex);
1035 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1036 sdp->sd_freeze_gh.gh_gl == NULL) {
1037 mutex_unlock(&sdp->sd_freeze_mutex);
1038 return 0;
1039 }
1040
1041 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1042 mutex_unlock(&sdp->sd_freeze_mutex);
1043 return 0;
1044}
1045
1046/**
1047 * statfs_fill - fill in the sg for a given RG
1048 * @rgd: the RG
1049 * @sc: the sc structure
1050 *
1051 * Returns: 0 on success, -ESTALE if the LVB is invalid
1052 */
1053
1054static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1055 struct gfs2_statfs_change_host *sc)
1056{
1057 gfs2_rgrp_verify(rgd);
1058 sc->sc_total += rgd->rd_data;
1059 sc->sc_free += rgd->rd_free;
1060 sc->sc_dinodes += rgd->rd_dinodes;
1061 return 0;
1062}
1063
1064/**
1065 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1066 * @sdp: the filesystem
1067 * @sc: the sc info that will be returned
1068 *
1069 * Any error (other than a signal) will cause this routine to fall back
1070 * to the synchronous version.
1071 *
1072 * FIXME: This really shouldn't busy wait like this.
1073 *
1074 * Returns: errno
1075 */
1076
1077static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1078{
1079 struct gfs2_rgrpd *rgd_next;
1080 struct gfs2_holder *gha, *gh;
1081 unsigned int slots = 64;
1082 unsigned int x;
1083 int done;
1084 int error = 0, err;
1085
1086 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1087 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1088 if (!gha)
1089 return -ENOMEM;
1090
1091 rgd_next = gfs2_rgrpd_get_first(sdp);
1092
1093 for (;;) {
1094 done = 1;
1095
1096 for (x = 0; x < slots; x++) {
1097 gh = gha + x;
1098
1099 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1100 err = gfs2_glock_wait(gh);
1101 if (err) {
1102 gfs2_holder_uninit(gh);
1103 error = err;
1104 } else {
1105 if (!error)
1106 error = statfs_slow_fill(
1107 gh->gh_gl->gl_object, sc);
1108 gfs2_glock_dq_uninit(gh);
1109 }
1110 }
1111
1112 if (gh->gh_gl)
1113 done = 0;
1114 else if (rgd_next && !error) {
1115 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1116 LM_ST_SHARED,
1117 GL_ASYNC,
1118 gh);
1119 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1120 done = 0;
1121 }
1122
1123 if (signal_pending(current))
1124 error = -ERESTARTSYS;
1125 }
1126
1127 if (done)
1128 break;
1129
1130 yield();
1131 }
1132
1133 kfree(gha);
1134 return error;
1135}
1136
1137/**
1138 * gfs2_statfs_i - Do a statfs
1139 * @sdp: the filesystem
1140 * @sg: the sg structure
1141 *
1142 * Returns: errno
1143 */
1144
1145static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1146{
1147 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1148 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1149
1150 spin_lock(&sdp->sd_statfs_spin);
1151
1152 *sc = *m_sc;
1153 sc->sc_total += l_sc->sc_total;
1154 sc->sc_free += l_sc->sc_free;
1155 sc->sc_dinodes += l_sc->sc_dinodes;
1156
1157 spin_unlock(&sdp->sd_statfs_spin);
1158
1159 if (sc->sc_free < 0)
1160 sc->sc_free = 0;
1161 if (sc->sc_free > sc->sc_total)
1162 sc->sc_free = sc->sc_total;
1163 if (sc->sc_dinodes < 0)
1164 sc->sc_dinodes = 0;
1165
1166 return 0;
1167}
1168
1169/**
1170 * gfs2_statfs - Gather and return stats about the filesystem
1171 * @sb: The superblock
1172 * @statfsbuf: The buffer
1173 *
1174 * Returns: 0 on success or error code
1175 */
1176
1177static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1178{
1179 struct super_block *sb = d_inode(dentry)->i_sb;
1180 struct gfs2_sbd *sdp = sb->s_fs_info;
1181 struct gfs2_statfs_change_host sc;
1182 int error;
1183
1184 error = gfs2_rindex_update(sdp);
1185 if (error)
1186 return error;
1187
1188 if (gfs2_tune_get(sdp, gt_statfs_slow))
1189 error = gfs2_statfs_slow(sdp, &sc);
1190 else
1191 error = gfs2_statfs_i(sdp, &sc);
1192
1193 if (error)
1194 return error;
1195
1196 buf->f_type = GFS2_MAGIC;
1197 buf->f_bsize = sdp->sd_sb.sb_bsize;
1198 buf->f_blocks = sc.sc_total;
1199 buf->f_bfree = sc.sc_free;
1200 buf->f_bavail = sc.sc_free;
1201 buf->f_files = sc.sc_dinodes + sc.sc_free;
1202 buf->f_ffree = sc.sc_free;
1203 buf->f_namelen = GFS2_FNAMESIZE;
1204
1205 return 0;
1206}
1207
1208/**
1209 * gfs2_remount_fs - called when the FS is remounted
1210 * @sb: the filesystem
1211 * @flags: the remount flags
1212 * @data: extra data passed in (not used right now)
1213 *
1214 * Returns: errno
1215 */
1216
1217static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1218{
1219 struct gfs2_sbd *sdp = sb->s_fs_info;
1220 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1221 struct gfs2_tune *gt = &sdp->sd_tune;
1222 int error;
1223
1224 sync_filesystem(sb);
1225
1226 spin_lock(>->gt_spin);
1227 args.ar_commit = gt->gt_logd_secs;
1228 args.ar_quota_quantum = gt->gt_quota_quantum;
1229 if (gt->gt_statfs_slow)
1230 args.ar_statfs_quantum = 0;
1231 else
1232 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1233 spin_unlock(>->gt_spin);
1234 error = gfs2_mount_args(&args, data);
1235 if (error)
1236 return error;
1237
1238 /* Not allowed to change locking details */
1239 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1240 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1241 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1242 return -EINVAL;
1243
1244 /* Some flags must not be changed */
1245 if (args_neq(&args, &sdp->sd_args, spectator) ||
1246 args_neq(&args, &sdp->sd_args, localflocks) ||
1247 args_neq(&args, &sdp->sd_args, meta))
1248 return -EINVAL;
1249
1250 if (sdp->sd_args.ar_spectator)
1251 *flags |= MS_RDONLY;
1252
1253 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1254 if (*flags & MS_RDONLY)
1255 error = gfs2_make_fs_ro(sdp);
1256 else
1257 error = gfs2_make_fs_rw(sdp);
1258 if (error)
1259 return error;
1260 }
1261
1262 sdp->sd_args = args;
1263 if (sdp->sd_args.ar_posix_acl)
1264 sb->s_flags |= MS_POSIXACL;
1265 else
1266 sb->s_flags &= ~MS_POSIXACL;
1267 if (sdp->sd_args.ar_nobarrier)
1268 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1269 else
1270 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1271 spin_lock(>->gt_spin);
1272 gt->gt_logd_secs = args.ar_commit;
1273 gt->gt_quota_quantum = args.ar_quota_quantum;
1274 if (args.ar_statfs_quantum) {
1275 gt->gt_statfs_slow = 0;
1276 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1277 }
1278 else {
1279 gt->gt_statfs_slow = 1;
1280 gt->gt_statfs_quantum = 30;
1281 }
1282 spin_unlock(>->gt_spin);
1283
1284 gfs2_online_uevent(sdp);
1285 return 0;
1286}
1287
1288/**
1289 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1290 * @inode: The inode to drop
1291 *
1292 * If we've received a callback on an iopen lock then its because a
1293 * remote node tried to deallocate the inode but failed due to this node
1294 * still having the inode open. Here we mark the link count zero
1295 * since we know that it must have reached zero if the GLF_DEMOTE flag
1296 * is set on the iopen glock. If we didn't do a disk read since the
1297 * remote node removed the final link then we might otherwise miss
1298 * this event. This check ensures that this node will deallocate the
1299 * inode's blocks, or alternatively pass the baton on to another
1300 * node for later deallocation.
1301 */
1302
1303static int gfs2_drop_inode(struct inode *inode)
1304{
1305 struct gfs2_inode *ip = GFS2_I(inode);
1306
1307 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
1308 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1309 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1310 clear_nlink(inode);
1311 }
1312 return generic_drop_inode(inode);
1313}
1314
1315static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1316{
1317 do {
1318 if (d1 == d2)
1319 return 1;
1320 d1 = d1->d_parent;
1321 } while (!IS_ROOT(d1));
1322 return 0;
1323}
1324
1325/**
1326 * gfs2_show_options - Show mount options for /proc/mounts
1327 * @s: seq_file structure
1328 * @root: root of this (sub)tree
1329 *
1330 * Returns: 0 on success or error code
1331 */
1332
1333static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1334{
1335 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1336 struct gfs2_args *args = &sdp->sd_args;
1337 int val;
1338
1339 if (is_ancestor(root, sdp->sd_master_dir))
1340 seq_puts(s, ",meta");
1341 if (args->ar_lockproto[0])
1342 seq_show_option(s, "lockproto", args->ar_lockproto);
1343 if (args->ar_locktable[0])
1344 seq_show_option(s, "locktable", args->ar_locktable);
1345 if (args->ar_hostdata[0])
1346 seq_show_option(s, "hostdata", args->ar_hostdata);
1347 if (args->ar_spectator)
1348 seq_puts(s, ",spectator");
1349 if (args->ar_localflocks)
1350 seq_puts(s, ",localflocks");
1351 if (args->ar_debug)
1352 seq_puts(s, ",debug");
1353 if (args->ar_posix_acl)
1354 seq_puts(s, ",acl");
1355 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1356 char *state;
1357 switch (args->ar_quota) {
1358 case GFS2_QUOTA_OFF:
1359 state = "off";
1360 break;
1361 case GFS2_QUOTA_ACCOUNT:
1362 state = "account";
1363 break;
1364 case GFS2_QUOTA_ON:
1365 state = "on";
1366 break;
1367 default:
1368 state = "unknown";
1369 break;
1370 }
1371 seq_printf(s, ",quota=%s", state);
1372 }
1373 if (args->ar_suiddir)
1374 seq_puts(s, ",suiddir");
1375 if (args->ar_data != GFS2_DATA_DEFAULT) {
1376 char *state;
1377 switch (args->ar_data) {
1378 case GFS2_DATA_WRITEBACK:
1379 state = "writeback";
1380 break;
1381 case GFS2_DATA_ORDERED:
1382 state = "ordered";
1383 break;
1384 default:
1385 state = "unknown";
1386 break;
1387 }
1388 seq_printf(s, ",data=%s", state);
1389 }
1390 if (args->ar_discard)
1391 seq_puts(s, ",discard");
1392 val = sdp->sd_tune.gt_logd_secs;
1393 if (val != 30)
1394 seq_printf(s, ",commit=%d", val);
1395 val = sdp->sd_tune.gt_statfs_quantum;
1396 if (val != 30)
1397 seq_printf(s, ",statfs_quantum=%d", val);
1398 else if (sdp->sd_tune.gt_statfs_slow)
1399 seq_puts(s, ",statfs_quantum=0");
1400 val = sdp->sd_tune.gt_quota_quantum;
1401 if (val != 60)
1402 seq_printf(s, ",quota_quantum=%d", val);
1403 if (args->ar_statfs_percent)
1404 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1405 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1406 const char *state;
1407
1408 switch (args->ar_errors) {
1409 case GFS2_ERRORS_WITHDRAW:
1410 state = "withdraw";
1411 break;
1412 case GFS2_ERRORS_PANIC:
1413 state = "panic";
1414 break;
1415 default:
1416 state = "unknown";
1417 break;
1418 }
1419 seq_printf(s, ",errors=%s", state);
1420 }
1421 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1422 seq_puts(s, ",nobarrier");
1423 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1424 seq_puts(s, ",demote_interface_used");
1425 if (args->ar_rgrplvb)
1426 seq_puts(s, ",rgrplvb");
1427 if (args->ar_loccookie)
1428 seq_puts(s, ",loccookie");
1429 return 0;
1430}
1431
1432static void gfs2_final_release_pages(struct gfs2_inode *ip)
1433{
1434 struct inode *inode = &ip->i_inode;
1435 struct gfs2_glock *gl = ip->i_gl;
1436
1437 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1438 truncate_inode_pages(&inode->i_data, 0);
1439
1440 if (atomic_read(&gl->gl_revokes) == 0) {
1441 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1442 clear_bit(GLF_DIRTY, &gl->gl_flags);
1443 }
1444}
1445
1446static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1447{
1448 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1449 struct gfs2_rgrpd *rgd;
1450 struct gfs2_holder gh;
1451 int error;
1452
1453 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1454 gfs2_consist_inode(ip);
1455 return -EIO;
1456 }
1457
1458 error = gfs2_rindex_update(sdp);
1459 if (error)
1460 return error;
1461
1462 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1463 if (error)
1464 return error;
1465
1466 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1467 if (!rgd) {
1468 gfs2_consist_inode(ip);
1469 error = -EIO;
1470 goto out_qs;
1471 }
1472
1473 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1474 if (error)
1475 goto out_qs;
1476
1477 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1478 sdp->sd_jdesc->jd_blocks);
1479 if (error)
1480 goto out_rg_gunlock;
1481
1482 gfs2_free_di(rgd, ip);
1483
1484 gfs2_final_release_pages(ip);
1485
1486 gfs2_trans_end(sdp);
1487
1488out_rg_gunlock:
1489 gfs2_glock_dq_uninit(&gh);
1490out_qs:
1491 gfs2_quota_unhold(ip);
1492 return error;
1493}
1494
1495/**
1496 * gfs2_evict_inode - Remove an inode from cache
1497 * @inode: The inode to evict
1498 *
1499 * There are three cases to consider:
1500 * 1. i_nlink == 0, we are final opener (and must deallocate)
1501 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1502 * 3. i_nlink > 0
1503 *
1504 * If the fs is read only, then we have to treat all cases as per #3
1505 * since we are unable to do any deallocation. The inode will be
1506 * deallocated by the next read/write node to attempt an allocation
1507 * in the same resource group
1508 *
1509 * We have to (at the moment) hold the inodes main lock to cover
1510 * the gap between unlocking the shared lock on the iopen lock and
1511 * taking the exclusive lock. I'd rather do a shared -> exclusive
1512 * conversion on the iopen lock, but we can change that later. This
1513 * is safe, just less efficient.
1514 */
1515
1516static void gfs2_evict_inode(struct inode *inode)
1517{
1518 struct super_block *sb = inode->i_sb;
1519 struct gfs2_sbd *sdp = sb->s_fs_info;
1520 struct gfs2_inode *ip = GFS2_I(inode);
1521 struct gfs2_holder gh;
1522 struct address_space *metamapping;
1523 int error;
1524
1525 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1526 clear_inode(inode);
1527 return;
1528 }
1529
1530 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1531 goto out;
1532
1533 /* Must not read inode block until block type has been verified */
1534 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1535 if (unlikely(error)) {
1536 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1537 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1538 gfs2_holder_uninit(&ip->i_iopen_gh);
1539 goto out;
1540 }
1541
1542 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1543 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1544 if (error)
1545 goto out_truncate;
1546 }
1547
1548 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1549 error = gfs2_inode_refresh(ip);
1550 if (error)
1551 goto out_truncate;
1552 }
1553
1554 if (ip->i_iopen_gh.gh_gl &&
1555 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1556 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1557 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1558 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1559 &ip->i_iopen_gh);
1560 error = gfs2_glock_nq(&ip->i_iopen_gh);
1561 if (error)
1562 goto out_truncate;
1563 }
1564
1565 /* Case 1 starts here */
1566
1567 if (S_ISDIR(inode->i_mode) &&
1568 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1569 error = gfs2_dir_exhash_dealloc(ip);
1570 if (error)
1571 goto out_unlock;
1572 }
1573
1574 if (ip->i_eattr) {
1575 error = gfs2_ea_dealloc(ip);
1576 if (error)
1577 goto out_unlock;
1578 }
1579
1580 if (!gfs2_is_stuffed(ip)) {
1581 error = gfs2_file_dealloc(ip);
1582 if (error)
1583 goto out_unlock;
1584 }
1585
1586 error = gfs2_dinode_dealloc(ip);
1587 goto out_unlock;
1588
1589out_truncate:
1590 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1591 metamapping = gfs2_glock2aspace(ip->i_gl);
1592 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1593 filemap_fdatawrite(metamapping);
1594 filemap_fdatawait(metamapping);
1595 }
1596 write_inode_now(inode, 1);
1597 gfs2_ail_flush(ip->i_gl, 0);
1598
1599 /* Case 2 starts here */
1600 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1601 if (error)
1602 goto out_unlock;
1603 /* Needs to be done before glock release & also in a transaction */
1604 truncate_inode_pages(&inode->i_data, 0);
1605 truncate_inode_pages(metamapping, 0);
1606 gfs2_trans_end(sdp);
1607
1608out_unlock:
1609 /* Error path for case 1 */
1610 if (gfs2_rs_active(&ip->i_res))
1611 gfs2_rs_deltree(&ip->i_res);
1612
1613 if (ip->i_iopen_gh.gh_gl) {
1614 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1615 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1616 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1617 }
1618 gfs2_holder_uninit(&ip->i_iopen_gh);
1619 }
1620 gfs2_glock_dq_uninit(&gh);
1621 if (error && error != GLR_TRYFAILED && error != -EROFS)
1622 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1623out:
1624 /* Case 3 starts here */
1625 truncate_inode_pages_final(&inode->i_data);
1626 gfs2_rsqa_delete(ip, NULL);
1627 gfs2_ordered_del_inode(ip);
1628 clear_inode(inode);
1629 gfs2_dir_hash_inval(ip);
1630 ip->i_gl->gl_object = NULL;
1631 flush_delayed_work(&ip->i_gl->gl_work);
1632 gfs2_glock_add_to_lru(ip->i_gl);
1633 gfs2_glock_put(ip->i_gl);
1634 ip->i_gl = NULL;
1635 if (ip->i_iopen_gh.gh_gl) {
1636 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1637 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1638 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1639 gfs2_holder_uninit(&ip->i_iopen_gh);
1640 }
1641}
1642
1643static struct inode *gfs2_alloc_inode(struct super_block *sb)
1644{
1645 struct gfs2_inode *ip;
1646
1647 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1648 if (ip) {
1649 ip->i_flags = 0;
1650 ip->i_gl = NULL;
1651 ip->i_rgd = NULL;
1652 memset(&ip->i_res, 0, sizeof(ip->i_res));
1653 RB_CLEAR_NODE(&ip->i_res.rs_node);
1654 ip->i_rahead = 0;
1655 }
1656 return &ip->i_inode;
1657}
1658
1659static void gfs2_i_callback(struct rcu_head *head)
1660{
1661 struct inode *inode = container_of(head, struct inode, i_rcu);
1662 kmem_cache_free(gfs2_inode_cachep, inode);
1663}
1664
1665static void gfs2_destroy_inode(struct inode *inode)
1666{
1667 call_rcu(&inode->i_rcu, gfs2_i_callback);
1668}
1669
1670const struct super_operations gfs2_super_ops = {
1671 .alloc_inode = gfs2_alloc_inode,
1672 .destroy_inode = gfs2_destroy_inode,
1673 .write_inode = gfs2_write_inode,
1674 .dirty_inode = gfs2_dirty_inode,
1675 .evict_inode = gfs2_evict_inode,
1676 .put_super = gfs2_put_super,
1677 .sync_fs = gfs2_sync_fs,
1678 .freeze_super = gfs2_freeze,
1679 .thaw_super = gfs2_unfreeze,
1680 .statfs = gfs2_statfs,
1681 .remount_fs = gfs2_remount_fs,
1682 .drop_inode = gfs2_drop_inode,
1683 .show_options = gfs2_show_options,
1684};
1685