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[SCSI] libsas: fix false positive 'device attached' conditions
[linux-2.6.git] / fs / gfs2 / super.c
blob6172fa77ad59acf938d7a82f12c6bd1b78735df0
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_error,
82 };
83
84 static 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
129 int 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
286 void 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
314 static 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
332 struct 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
343 int 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
369 int 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
407 fail:
408 t_gh.gh_flags |= GL_NOCACHE;
409 gfs2_glock_dq_uninit(&t_gh);
410
411 return error;
412 }
413
414 void 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
423 static 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
432 int 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
471 out_m_bh:
472 brelse(m_bh);
473 out:
474 gfs2_glock_dq_uninit(&gh);
475 return 0;
476 }
477
478 void 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
513 void 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
536 int 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
578 out_bh2:
579 brelse(l_bh);
580 out_bh:
581 brelse(m_bh);
582 out:
583 gfs2_glock_dq_uninit(&gh);
584 return error;
585 }
586
587 struct 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
602 static 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
646 out:
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
667 int 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
694 void 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
704 void 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
749 static 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 int ret = 0;
756
757 if (wbc->sync_mode == WB_SYNC_ALL)
758 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
759 if (bdi->dirty_exceeded)
760 gfs2_ail1_flush(sdp, wbc);
761 else
762 filemap_fdatawrite(metamapping);
763 if (wbc->sync_mode == WB_SYNC_ALL)
764 ret = filemap_fdatawait(metamapping);
765 if (ret)
766 mark_inode_dirty_sync(inode);
767 return ret;
768 }
769
770 /**
771 * gfs2_dirty_inode - check for atime updates
772 * @inode: The inode in question
773 * @flags: The type of dirty
774 *
775 * Unfortunately it can be called under any combination of inode
776 * glock and transaction lock, so we have to check carefully.
777 *
778 * At the moment this deals only with atime - it should be possible
779 * to expand that role in future, once a review of the locking has
780 * been carried out.
781 */
782
783 static void gfs2_dirty_inode(struct inode *inode, int flags)
784 {
785 struct gfs2_inode *ip = GFS2_I(inode);
786 struct gfs2_sbd *sdp = GFS2_SB(inode);
787 struct buffer_head *bh;
788 struct gfs2_holder gh;
789 int need_unlock = 0;
790 int need_endtrans = 0;
791 int ret;
792
793 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
794 return;
795
796 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
797 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
798 if (ret) {
799 fs_err(sdp, "dirty_inode: glock %d\n", ret);
800 return;
801 }
802 need_unlock = 1;
803 }
804
805 if (current->journal_info == NULL) {
806 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
807 if (ret) {
808 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
809 goto out;
810 }
811 need_endtrans = 1;
812 }
813
814 ret = gfs2_meta_inode_buffer(ip, &bh);
815 if (ret == 0) {
816 gfs2_trans_add_bh(ip->i_gl, bh, 1);
817 gfs2_dinode_out(ip, bh->b_data);
818 brelse(bh);
819 }
820
821 if (need_endtrans)
822 gfs2_trans_end(sdp);
823 out:
824 if (need_unlock)
825 gfs2_glock_dq_uninit(&gh);
826 }
827
828 /**
829 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
830 * @sdp: the filesystem
831 *
832 * Returns: errno
833 */
834
835 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
836 {
837 struct gfs2_holder t_gh;
838 int error;
839
840 flush_workqueue(gfs2_delete_workqueue);
841 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
842 gfs2_statfs_sync(sdp->sd_vfs, 0);
843
844 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
845 &t_gh);
846 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
847 return error;
848
849 gfs2_meta_syncfs(sdp);
850 gfs2_log_shutdown(sdp);
851
852 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
853
854 if (t_gh.gh_gl)
855 gfs2_glock_dq_uninit(&t_gh);
856
857 gfs2_quota_cleanup(sdp);
858
859 return error;
860 }
861
862 static int gfs2_umount_recovery_wait(void *word)
863 {
864 schedule();
865 return 0;
866 }
867
868 /**
869 * gfs2_put_super - Unmount the filesystem
870 * @sb: The VFS superblock
871 *
872 */
873
874 static void gfs2_put_super(struct super_block *sb)
875 {
876 struct gfs2_sbd *sdp = sb->s_fs_info;
877 int error;
878 struct gfs2_jdesc *jd;
879
880 /* Unfreeze the filesystem, if we need to */
881
882 mutex_lock(&sdp->sd_freeze_lock);
883 if (sdp->sd_freeze_count)
884 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
885 mutex_unlock(&sdp->sd_freeze_lock);
886
887 /* No more recovery requests */
888 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
889 smp_mb();
890
891 /* Wait on outstanding recovery */
892 restart:
893 spin_lock(&sdp->sd_jindex_spin);
894 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
895 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
896 continue;
897 spin_unlock(&sdp->sd_jindex_spin);
898 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
899 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
900 goto restart;
901 }
902 spin_unlock(&sdp->sd_jindex_spin);
903
904 kthread_stop(sdp->sd_quotad_process);
905 kthread_stop(sdp->sd_logd_process);
906
907 if (!(sb->s_flags & MS_RDONLY)) {
908 error = gfs2_make_fs_ro(sdp);
909 if (error)
910 gfs2_io_error(sdp);
911 }
912 /* At this point, we're through modifying the disk */
913
914 /* Release stuff */
915
916 iput(sdp->sd_jindex);
917 iput(sdp->sd_statfs_inode);
918 iput(sdp->sd_rindex);
919 iput(sdp->sd_quota_inode);
920
921 gfs2_glock_put(sdp->sd_rename_gl);
922 gfs2_glock_put(sdp->sd_trans_gl);
923
924 if (!sdp->sd_args.ar_spectator) {
925 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
926 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
927 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
928 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
929 iput(sdp->sd_sc_inode);
930 iput(sdp->sd_qc_inode);
931 }
932
933 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
934 gfs2_clear_rgrpd(sdp);
935 gfs2_jindex_free(sdp);
936 /* Take apart glock structures and buffer lists */
937 gfs2_gl_hash_clear(sdp);
938 /* Unmount the locking protocol */
939 gfs2_lm_unmount(sdp);
940
941 /* At this point, we're through participating in the lockspace */
942 gfs2_sys_fs_del(sdp);
943 }
944
945 /**
946 * gfs2_sync_fs - sync the filesystem
947 * @sb: the superblock
948 *
949 * Flushes the log to disk.
950 */
951
952 static int gfs2_sync_fs(struct super_block *sb, int wait)
953 {
954 struct gfs2_sbd *sdp = sb->s_fs_info;
955 if (wait && sdp)
956 gfs2_log_flush(sdp, NULL);
957 return 0;
958 }
959
960 /**
961 * gfs2_freeze - prevent further writes to the filesystem
962 * @sb: the VFS structure for the filesystem
963 *
964 */
965
966 static int gfs2_freeze(struct super_block *sb)
967 {
968 struct gfs2_sbd *sdp = sb->s_fs_info;
969 int error;
970
971 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
972 return -EINVAL;
973
974 for (;;) {
975 error = gfs2_freeze_fs(sdp);
976 if (!error)
977 break;
978
979 switch (error) {
980 case -EBUSY:
981 fs_err(sdp, "waiting for recovery before freeze\n");
982 break;
983
984 default:
985 fs_err(sdp, "error freezing FS: %d\n", error);
986 break;
987 }
988
989 fs_err(sdp, "retrying...\n");
990 msleep(1000);
991 }
992 return 0;
993 }
994
995 /**
996 * gfs2_unfreeze - reallow writes to the filesystem
997 * @sb: the VFS structure for the filesystem
998 *
999 */
1000
1001 static int gfs2_unfreeze(struct super_block *sb)
1002 {
1003 gfs2_unfreeze_fs(sb->s_fs_info);
1004 return 0;
1005 }
1006
1007 /**
1008 * statfs_fill - fill in the sg for a given RG
1009 * @rgd: the RG
1010 * @sc: the sc structure
1011 *
1012 * Returns: 0 on success, -ESTALE if the LVB is invalid
1013 */
1014
1015 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1016 struct gfs2_statfs_change_host *sc)
1017 {
1018 gfs2_rgrp_verify(rgd);
1019 sc->sc_total += rgd->rd_data;
1020 sc->sc_free += rgd->rd_free;
1021 sc->sc_dinodes += rgd->rd_dinodes;
1022 return 0;
1023 }
1024
1025 /**
1026 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1027 * @sdp: the filesystem
1028 * @sc: the sc info that will be returned
1029 *
1030 * Any error (other than a signal) will cause this routine to fall back
1031 * to the synchronous version.
1032 *
1033 * FIXME: This really shouldn't busy wait like this.
1034 *
1035 * Returns: errno
1036 */
1037
1038 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1039 {
1040 struct gfs2_rgrpd *rgd_next;
1041 struct gfs2_holder *gha, *gh;
1042 unsigned int slots = 64;
1043 unsigned int x;
1044 int done;
1045 int error = 0, err;
1046
1047 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1048 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1049 if (!gha)
1050 return -ENOMEM;
1051
1052 rgd_next = gfs2_rgrpd_get_first(sdp);
1053
1054 for (;;) {
1055 done = 1;
1056
1057 for (x = 0; x < slots; x++) {
1058 gh = gha + x;
1059
1060 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1061 err = gfs2_glock_wait(gh);
1062 if (err) {
1063 gfs2_holder_uninit(gh);
1064 error = err;
1065 } else {
1066 if (!error)
1067 error = statfs_slow_fill(
1068 gh->gh_gl->gl_object, sc);
1069 gfs2_glock_dq_uninit(gh);
1070 }
1071 }
1072
1073 if (gh->gh_gl)
1074 done = 0;
1075 else if (rgd_next && !error) {
1076 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1077 LM_ST_SHARED,
1078 GL_ASYNC,
1079 gh);
1080 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1081 done = 0;
1082 }
1083
1084 if (signal_pending(current))
1085 error = -ERESTARTSYS;
1086 }
1087
1088 if (done)
1089 break;
1090
1091 yield();
1092 }
1093
1094 kfree(gha);
1095 return error;
1096 }
1097
1098 /**
1099 * gfs2_statfs_i - Do a statfs
1100 * @sdp: the filesystem
1101 * @sg: the sg structure
1102 *
1103 * Returns: errno
1104 */
1105
1106 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1107 {
1108 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1109 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1110
1111 spin_lock(&sdp->sd_statfs_spin);
1112
1113 *sc = *m_sc;
1114 sc->sc_total += l_sc->sc_total;
1115 sc->sc_free += l_sc->sc_free;
1116 sc->sc_dinodes += l_sc->sc_dinodes;
1117
1118 spin_unlock(&sdp->sd_statfs_spin);
1119
1120 if (sc->sc_free < 0)
1121 sc->sc_free = 0;
1122 if (sc->sc_free > sc->sc_total)
1123 sc->sc_free = sc->sc_total;
1124 if (sc->sc_dinodes < 0)
1125 sc->sc_dinodes = 0;
1126
1127 return 0;
1128 }
1129
1130 /**
1131 * gfs2_statfs - Gather and return stats about the filesystem
1132 * @sb: The superblock
1133 * @statfsbuf: The buffer
1134 *
1135 * Returns: 0 on success or error code
1136 */
1137
1138 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1139 {
1140 struct super_block *sb = dentry->d_inode->i_sb;
1141 struct gfs2_sbd *sdp = sb->s_fs_info;
1142 struct gfs2_statfs_change_host sc;
1143 int error;
1144
1145 error = gfs2_rindex_update(sdp);
1146 if (error)
1147 return error;
1148
1149 if (gfs2_tune_get(sdp, gt_statfs_slow))
1150 error = gfs2_statfs_slow(sdp, &sc);
1151 else
1152 error = gfs2_statfs_i(sdp, &sc);
1153
1154 if (error)
1155 return error;
1156
1157 buf->f_type = GFS2_MAGIC;
1158 buf->f_bsize = sdp->sd_sb.sb_bsize;
1159 buf->f_blocks = sc.sc_total;
1160 buf->f_bfree = sc.sc_free;
1161 buf->f_bavail = sc.sc_free;
1162 buf->f_files = sc.sc_dinodes + sc.sc_free;
1163 buf->f_ffree = sc.sc_free;
1164 buf->f_namelen = GFS2_FNAMESIZE;
1165
1166 return 0;
1167 }
1168
1169 /**
1170 * gfs2_remount_fs - called when the FS is remounted
1171 * @sb: the filesystem
1172 * @flags: the remount flags
1173 * @data: extra data passed in (not used right now)
1174 *
1175 * Returns: errno
1176 */
1177
1178 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1179 {
1180 struct gfs2_sbd *sdp = sb->s_fs_info;
1181 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1182 struct gfs2_tune *gt = &sdp->sd_tune;
1183 int error;
1184
1185 spin_lock(&gt->gt_spin);
1186 args.ar_commit = gt->gt_logd_secs;
1187 args.ar_quota_quantum = gt->gt_quota_quantum;
1188 if (gt->gt_statfs_slow)
1189 args.ar_statfs_quantum = 0;
1190 else
1191 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1192 spin_unlock(&gt->gt_spin);
1193 error = gfs2_mount_args(&args, data);
1194 if (error)
1195 return error;
1196
1197 /* Not allowed to change locking details */
1198 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1199 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1200 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1201 return -EINVAL;
1202
1203 /* Some flags must not be changed */
1204 if (args_neq(&args, &sdp->sd_args, spectator) ||
1205 args_neq(&args, &sdp->sd_args, localflocks) ||
1206 args_neq(&args, &sdp->sd_args, meta))
1207 return -EINVAL;
1208
1209 if (sdp->sd_args.ar_spectator)
1210 *flags |= MS_RDONLY;
1211
1212 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1213 if (*flags & MS_RDONLY)
1214 error = gfs2_make_fs_ro(sdp);
1215 else
1216 error = gfs2_make_fs_rw(sdp);
1217 if (error)
1218 return error;
1219 }
1220
1221 sdp->sd_args = args;
1222 if (sdp->sd_args.ar_posix_acl)
1223 sb->s_flags |= MS_POSIXACL;
1224 else
1225 sb->s_flags &= ~MS_POSIXACL;
1226 if (sdp->sd_args.ar_nobarrier)
1227 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1228 else
1229 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1230 spin_lock(&gt->gt_spin);
1231 gt->gt_logd_secs = args.ar_commit;
1232 gt->gt_quota_quantum = args.ar_quota_quantum;
1233 if (args.ar_statfs_quantum) {
1234 gt->gt_statfs_slow = 0;
1235 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1236 }
1237 else {
1238 gt->gt_statfs_slow = 1;
1239 gt->gt_statfs_quantum = 30;
1240 }
1241 spin_unlock(&gt->gt_spin);
1242
1243 gfs2_online_uevent(sdp);
1244 return 0;
1245 }
1246
1247 /**
1248 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1249 * @inode: The inode to drop
1250 *
1251 * If we've received a callback on an iopen lock then its because a
1252 * remote node tried to deallocate the inode but failed due to this node
1253 * still having the inode open. Here we mark the link count zero
1254 * since we know that it must have reached zero if the GLF_DEMOTE flag
1255 * is set on the iopen glock. If we didn't do a disk read since the
1256 * remote node removed the final link then we might otherwise miss
1257 * this event. This check ensures that this node will deallocate the
1258 * inode's blocks, or alternatively pass the baton on to another
1259 * node for later deallocation.
1260 */
1261
1262 static int gfs2_drop_inode(struct inode *inode)
1263 {
1264 struct gfs2_inode *ip = GFS2_I(inode);
1265
1266 if (inode->i_nlink) {
1267 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1268 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1269 clear_nlink(inode);
1270 }
1271 return generic_drop_inode(inode);
1272 }
1273
1274 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1275 {
1276 do {
1277 if (d1 == d2)
1278 return 1;
1279 d1 = d1->d_parent;
1280 } while (!IS_ROOT(d1));
1281 return 0;
1282 }
1283
1284 /**
1285 * gfs2_show_options - Show mount options for /proc/mounts
1286 * @s: seq_file structure
1287 * @root: root of this (sub)tree
1288 *
1289 * Returns: 0 on success or error code
1290 */
1291
1292 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1293 {
1294 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1295 struct gfs2_args *args = &sdp->sd_args;
1296 int val;
1297
1298 if (is_ancestor(root, sdp->sd_master_dir))
1299 seq_printf(s, ",meta");
1300 if (args->ar_lockproto[0])
1301 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1302 if (args->ar_locktable[0])
1303 seq_printf(s, ",locktable=%s", args->ar_locktable);
1304 if (args->ar_hostdata[0])
1305 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1306 if (args->ar_spectator)
1307 seq_printf(s, ",spectator");
1308 if (args->ar_localflocks)
1309 seq_printf(s, ",localflocks");
1310 if (args->ar_debug)
1311 seq_printf(s, ",debug");
1312 if (args->ar_posix_acl)
1313 seq_printf(s, ",acl");
1314 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1315 char *state;
1316 switch (args->ar_quota) {
1317 case GFS2_QUOTA_OFF:
1318 state = "off";
1319 break;
1320 case GFS2_QUOTA_ACCOUNT:
1321 state = "account";
1322 break;
1323 case GFS2_QUOTA_ON:
1324 state = "on";
1325 break;
1326 default:
1327 state = "unknown";
1328 break;
1329 }
1330 seq_printf(s, ",quota=%s", state);
1331 }
1332 if (args->ar_suiddir)
1333 seq_printf(s, ",suiddir");
1334 if (args->ar_data != GFS2_DATA_DEFAULT) {
1335 char *state;
1336 switch (args->ar_data) {
1337 case GFS2_DATA_WRITEBACK:
1338 state = "writeback";
1339 break;
1340 case GFS2_DATA_ORDERED:
1341 state = "ordered";
1342 break;
1343 default:
1344 state = "unknown";
1345 break;
1346 }
1347 seq_printf(s, ",data=%s", state);
1348 }
1349 if (args->ar_discard)
1350 seq_printf(s, ",discard");
1351 val = sdp->sd_tune.gt_logd_secs;
1352 if (val != 30)
1353 seq_printf(s, ",commit=%d", val);
1354 val = sdp->sd_tune.gt_statfs_quantum;
1355 if (val != 30)
1356 seq_printf(s, ",statfs_quantum=%d", val);
1357 val = sdp->sd_tune.gt_quota_quantum;
1358 if (val != 60)
1359 seq_printf(s, ",quota_quantum=%d", val);
1360 if (args->ar_statfs_percent)
1361 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1362 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1363 const char *state;
1364
1365 switch (args->ar_errors) {
1366 case GFS2_ERRORS_WITHDRAW:
1367 state = "withdraw";
1368 break;
1369 case GFS2_ERRORS_PANIC:
1370 state = "panic";
1371 break;
1372 default:
1373 state = "unknown";
1374 break;
1375 }
1376 seq_printf(s, ",errors=%s", state);
1377 }
1378 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1379 seq_printf(s, ",nobarrier");
1380 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1381 seq_printf(s, ",demote_interface_used");
1382 return 0;
1383 }
1384
1385 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1386 {
1387 struct inode *inode = &ip->i_inode;
1388 struct gfs2_glock *gl = ip->i_gl;
1389
1390 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1391 truncate_inode_pages(&inode->i_data, 0);
1392
1393 if (atomic_read(&gl->gl_revokes) == 0) {
1394 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1395 clear_bit(GLF_DIRTY, &gl->gl_flags);
1396 }
1397 }
1398
1399 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1400 {
1401 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1402 struct gfs2_qadata *qa;
1403 struct gfs2_rgrpd *rgd;
1404 struct gfs2_holder gh;
1405 int error;
1406
1407 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1408 gfs2_consist_inode(ip);
1409 return -EIO;
1410 }
1411
1412 qa = gfs2_qadata_get(ip);
1413 if (!qa)
1414 return -ENOMEM;
1415
1416 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1417 if (error)
1418 goto out;
1419
1420 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1421 if (!rgd) {
1422 gfs2_consist_inode(ip);
1423 error = -EIO;
1424 goto out_qs;
1425 }
1426
1427 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1428 if (error)
1429 goto out_qs;
1430
1431 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1432 sdp->sd_jdesc->jd_blocks);
1433 if (error)
1434 goto out_rg_gunlock;
1435
1436 gfs2_free_di(rgd, ip);
1437
1438 gfs2_final_release_pages(ip);
1439
1440 gfs2_trans_end(sdp);
1441
1442 out_rg_gunlock:
1443 gfs2_glock_dq_uninit(&gh);
1444 out_qs:
1445 gfs2_quota_unhold(ip);
1446 out:
1447 gfs2_qadata_put(ip);
1448 return error;
1449 }
1450
1451 /**
1452 * gfs2_evict_inode - Remove an inode from cache
1453 * @inode: The inode to evict
1454 *
1455 * There are three cases to consider:
1456 * 1. i_nlink == 0, we are final opener (and must deallocate)
1457 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1458 * 3. i_nlink > 0
1459 *
1460 * If the fs is read only, then we have to treat all cases as per #3
1461 * since we are unable to do any deallocation. The inode will be
1462 * deallocated by the next read/write node to attempt an allocation
1463 * in the same resource group
1464 *
1465 * We have to (at the moment) hold the inodes main lock to cover
1466 * the gap between unlocking the shared lock on the iopen lock and
1467 * taking the exclusive lock. I'd rather do a shared -> exclusive
1468 * conversion on the iopen lock, but we can change that later. This
1469 * is safe, just less efficient.
1470 */
1471
1472 static void gfs2_evict_inode(struct inode *inode)
1473 {
1474 struct super_block *sb = inode->i_sb;
1475 struct gfs2_sbd *sdp = sb->s_fs_info;
1476 struct gfs2_inode *ip = GFS2_I(inode);
1477 struct gfs2_holder gh;
1478 int error;
1479
1480 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1481 goto out;
1482
1483 /* Must not read inode block until block type has been verified */
1484 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1485 if (unlikely(error)) {
1486 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1487 goto out;
1488 }
1489
1490 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1491 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1492 if (error)
1493 goto out_truncate;
1494 }
1495
1496 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1497 error = gfs2_inode_refresh(ip);
1498 if (error)
1499 goto out_truncate;
1500 }
1501
1502 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1503 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1504 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1505 error = gfs2_glock_nq(&ip->i_iopen_gh);
1506 if (error)
1507 goto out_truncate;
1508
1509 /* Case 1 starts here */
1510
1511 if (S_ISDIR(inode->i_mode) &&
1512 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1513 error = gfs2_dir_exhash_dealloc(ip);
1514 if (error)
1515 goto out_unlock;
1516 }
1517
1518 if (ip->i_eattr) {
1519 error = gfs2_ea_dealloc(ip);
1520 if (error)
1521 goto out_unlock;
1522 }
1523
1524 if (!gfs2_is_stuffed(ip)) {
1525 error = gfs2_file_dealloc(ip);
1526 if (error)
1527 goto out_unlock;
1528 }
1529
1530 error = gfs2_dinode_dealloc(ip);
1531 goto out_unlock;
1532
1533 out_truncate:
1534 gfs2_log_flush(sdp, ip->i_gl);
1535 write_inode_now(inode, 1);
1536 gfs2_ail_flush(ip->i_gl, 0);
1537
1538 /* Case 2 starts here */
1539 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1540 if (error)
1541 goto out_unlock;
1542 /* Needs to be done before glock release & also in a transaction */
1543 truncate_inode_pages(&inode->i_data, 0);
1544 gfs2_trans_end(sdp);
1545
1546 out_unlock:
1547 /* Error path for case 1 */
1548 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1549 gfs2_glock_dq(&ip->i_iopen_gh);
1550 gfs2_holder_uninit(&ip->i_iopen_gh);
1551 gfs2_glock_dq_uninit(&gh);
1552 if (error && error != GLR_TRYFAILED && error != -EROFS)
1553 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1554 out:
1555 /* Case 3 starts here */
1556 truncate_inode_pages(&inode->i_data, 0);
1557 end_writeback(inode);
1558 gfs2_dir_hash_inval(ip);
1559 ip->i_gl->gl_object = NULL;
1560 flush_delayed_work_sync(&ip->i_gl->gl_work);
1561 gfs2_glock_add_to_lru(ip->i_gl);
1562 gfs2_glock_put(ip->i_gl);
1563 ip->i_gl = NULL;
1564 if (ip->i_iopen_gh.gh_gl) {
1565 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1566 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1567 }
1568 }
1569
1570 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1571 {
1572 struct gfs2_inode *ip;
1573
1574 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1575 if (ip) {
1576 ip->i_flags = 0;
1577 ip->i_gl = NULL;
1578 ip->i_rgd = NULL;
1579 }
1580 return &ip->i_inode;
1581 }
1582
1583 static void gfs2_i_callback(struct rcu_head *head)
1584 {
1585 struct inode *inode = container_of(head, struct inode, i_rcu);
1586 kmem_cache_free(gfs2_inode_cachep, inode);
1587 }
1588
1589 static void gfs2_destroy_inode(struct inode *inode)
1590 {
1591 call_rcu(&inode->i_rcu, gfs2_i_callback);
1592 }
1593
1594 const struct super_operations gfs2_super_ops = {
1595 .alloc_inode = gfs2_alloc_inode,
1596 .destroy_inode = gfs2_destroy_inode,
1597 .write_inode = gfs2_write_inode,
1598 .dirty_inode = gfs2_dirty_inode,
1599 .evict_inode = gfs2_evict_inode,
1600 .put_super = gfs2_put_super,
1601 .sync_fs = gfs2_sync_fs,
1602 .freeze_fs = gfs2_freeze,
1603 .unfreeze_fs = gfs2_unfreeze,
1604 .statfs = gfs2_statfs,
1605 .remount_fs = gfs2_remount_fs,
1606 .drop_inode = gfs2_drop_inode,
1607 .show_options = gfs2_show_options,
1608 };
1609
Linus' kernel tree