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i2c-smbus: Convert kzalloc to devm_kzalloc
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / super.c
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24 #include <linux/wait.h>
25 #include <linux/writeback.h>
26 #include <linux/backing-dev.h>
27
28 #include "gfs2.h"
29 #include "incore.h"
30 #include "bmap.h"
31 #include "dir.h"
32 #include "glock.h"
33 #include "glops.h"
34 #include "inode.h"
35 #include "log.h"
36 #include "meta_io.h"
37 #include "quota.h"
38 #include "recovery.h"
39 #include "rgrp.h"
40 #include "super.h"
41 #include "trans.h"
42 #include "util.h"
43 #include "sys.h"
44 #include "xattr.h"
45
46 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
47
48 enum {
49 Opt_lockproto,
50 Opt_locktable,
51 Opt_hostdata,
52 Opt_spectator,
53 Opt_ignore_local_fs,
54 Opt_localflocks,
55 Opt_localcaching,
56 Opt_debug,
57 Opt_nodebug,
58 Opt_upgrade,
59 Opt_acl,
60 Opt_noacl,
61 Opt_quota_off,
62 Opt_quota_account,
63 Opt_quota_on,
64 Opt_quota,
65 Opt_noquota,
66 Opt_suiddir,
67 Opt_nosuiddir,
68 Opt_data_writeback,
69 Opt_data_ordered,
70 Opt_meta,
71 Opt_discard,
72 Opt_nodiscard,
73 Opt_commit,
74 Opt_err_withdraw,
75 Opt_err_panic,
76 Opt_statfs_quantum,
77 Opt_statfs_percent,
78 Opt_quota_quantum,
79 Opt_barrier,
80 Opt_nobarrier,
81 Opt_rgrplvb,
82 Opt_norgrplvb,
83 Opt_error,
84 };
85
86 static const match_table_t tokens = {
87 {Opt_lockproto, "lockproto=%s"},
88 {Opt_locktable, "locktable=%s"},
89 {Opt_hostdata, "hostdata=%s"},
90 {Opt_spectator, "spectator"},
91 {Opt_spectator, "norecovery"},
92 {Opt_ignore_local_fs, "ignore_local_fs"},
93 {Opt_localflocks, "localflocks"},
94 {Opt_localcaching, "localcaching"},
95 {Opt_debug, "debug"},
96 {Opt_nodebug, "nodebug"},
97 {Opt_upgrade, "upgrade"},
98 {Opt_acl, "acl"},
99 {Opt_noacl, "noacl"},
100 {Opt_quota_off, "quota=off"},
101 {Opt_quota_account, "quota=account"},
102 {Opt_quota_on, "quota=on"},
103 {Opt_quota, "quota"},
104 {Opt_noquota, "noquota"},
105 {Opt_suiddir, "suiddir"},
106 {Opt_nosuiddir, "nosuiddir"},
107 {Opt_data_writeback, "data=writeback"},
108 {Opt_data_ordered, "data=ordered"},
109 {Opt_meta, "meta"},
110 {Opt_discard, "discard"},
111 {Opt_nodiscard, "nodiscard"},
112 {Opt_commit, "commit=%d"},
113 {Opt_err_withdraw, "errors=withdraw"},
114 {Opt_err_panic, "errors=panic"},
115 {Opt_statfs_quantum, "statfs_quantum=%d"},
116 {Opt_statfs_percent, "statfs_percent=%d"},
117 {Opt_quota_quantum, "quota_quantum=%d"},
118 {Opt_barrier, "barrier"},
119 {Opt_nobarrier, "nobarrier"},
120 {Opt_rgrplvb, "rgrplvb"},
121 {Opt_norgrplvb, "norgrplvb"},
122 {Opt_error, NULL}
123 };
124
125 /**
126 * gfs2_mount_args - Parse mount options
127 * @args: The structure into which the parsed options will be written
128 * @options: The options to parse
129 *
130 * Return: errno
131 */
132
133 int gfs2_mount_args(struct gfs2_args *args, char *options)
134 {
135 char *o;
136 int token;
137 substring_t tmp[MAX_OPT_ARGS];
138 int rv;
139
140 /* Split the options into tokens with the "," character and
141 process them */
142
143 while (1) {
144 o = strsep(&options, ",");
145 if (o == NULL)
146 break;
147 if (*o == '\0')
148 continue;
149
150 token = match_token(o, tokens, tmp);
151 switch (token) {
152 case Opt_lockproto:
153 match_strlcpy(args->ar_lockproto, &tmp[0],
154 GFS2_LOCKNAME_LEN);
155 break;
156 case Opt_locktable:
157 match_strlcpy(args->ar_locktable, &tmp[0],
158 GFS2_LOCKNAME_LEN);
159 break;
160 case Opt_hostdata:
161 match_strlcpy(args->ar_hostdata, &tmp[0],
162 GFS2_LOCKNAME_LEN);
163 break;
164 case Opt_spectator:
165 args->ar_spectator = 1;
166 break;
167 case Opt_ignore_local_fs:
168 /* Retained for backwards compat only */
169 break;
170 case Opt_localflocks:
171 args->ar_localflocks = 1;
172 break;
173 case Opt_localcaching:
174 /* Retained for backwards compat only */
175 break;
176 case Opt_debug:
177 if (args->ar_errors == GFS2_ERRORS_PANIC) {
178 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
179 "are mutually exclusive.\n");
180 return -EINVAL;
181 }
182 args->ar_debug = 1;
183 break;
184 case Opt_nodebug:
185 args->ar_debug = 0;
186 break;
187 case Opt_upgrade:
188 /* Retained for backwards compat only */
189 break;
190 case Opt_acl:
191 args->ar_posix_acl = 1;
192 break;
193 case Opt_noacl:
194 args->ar_posix_acl = 0;
195 break;
196 case Opt_quota_off:
197 case Opt_noquota:
198 args->ar_quota = GFS2_QUOTA_OFF;
199 break;
200 case Opt_quota_account:
201 args->ar_quota = GFS2_QUOTA_ACCOUNT;
202 break;
203 case Opt_quota_on:
204 case Opt_quota:
205 args->ar_quota = GFS2_QUOTA_ON;
206 break;
207 case Opt_suiddir:
208 args->ar_suiddir = 1;
209 break;
210 case Opt_nosuiddir:
211 args->ar_suiddir = 0;
212 break;
213 case Opt_data_writeback:
214 args->ar_data = GFS2_DATA_WRITEBACK;
215 break;
216 case Opt_data_ordered:
217 args->ar_data = GFS2_DATA_ORDERED;
218 break;
219 case Opt_meta:
220 args->ar_meta = 1;
221 break;
222 case Opt_discard:
223 args->ar_discard = 1;
224 break;
225 case Opt_nodiscard:
226 args->ar_discard = 0;
227 break;
228 case Opt_commit:
229 rv = match_int(&tmp[0], &args->ar_commit);
230 if (rv || args->ar_commit <= 0) {
231 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
232 return rv ? rv : -EINVAL;
233 }
234 break;
235 case Opt_statfs_quantum:
236 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
237 if (rv || args->ar_statfs_quantum < 0) {
238 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
239 return rv ? rv : -EINVAL;
240 }
241 break;
242 case Opt_quota_quantum:
243 rv = match_int(&tmp[0], &args->ar_quota_quantum);
244 if (rv || args->ar_quota_quantum <= 0) {
245 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
246 return rv ? rv : -EINVAL;
247 }
248 break;
249 case Opt_statfs_percent:
250 rv = match_int(&tmp[0], &args->ar_statfs_percent);
251 if (rv || args->ar_statfs_percent < 0 ||
252 args->ar_statfs_percent > 100) {
253 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
254 return rv ? rv : -EINVAL;
255 }
256 break;
257 case Opt_err_withdraw:
258 args->ar_errors = GFS2_ERRORS_WITHDRAW;
259 break;
260 case Opt_err_panic:
261 if (args->ar_debug) {
262 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
263 "are mutually exclusive.\n");
264 return -EINVAL;
265 }
266 args->ar_errors = GFS2_ERRORS_PANIC;
267 break;
268 case Opt_barrier:
269 args->ar_nobarrier = 0;
270 break;
271 case Opt_nobarrier:
272 args->ar_nobarrier = 1;
273 break;
274 case Opt_rgrplvb:
275 args->ar_rgrplvb = 1;
276 break;
277 case Opt_norgrplvb:
278 args->ar_rgrplvb = 0;
279 break;
280 case Opt_error:
281 default:
282 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
283 return -EINVAL;
284 }
285 }
286
287 return 0;
288 }
289
290 /**
291 * gfs2_jindex_free - Clear all the journal index information
292 * @sdp: The GFS2 superblock
293 *
294 */
295
296 void gfs2_jindex_free(struct gfs2_sbd *sdp)
297 {
298 struct list_head list, *head;
299 struct gfs2_jdesc *jd;
300 struct gfs2_journal_extent *jext;
301
302 spin_lock(&sdp->sd_jindex_spin);
303 list_add(&list, &sdp->sd_jindex_list);
304 list_del_init(&sdp->sd_jindex_list);
305 sdp->sd_journals = 0;
306 spin_unlock(&sdp->sd_jindex_spin);
307
308 while (!list_empty(&list)) {
309 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
310 head = &jd->extent_list;
311 while (!list_empty(head)) {
312 jext = list_entry(head->next,
313 struct gfs2_journal_extent,
314 extent_list);
315 list_del(&jext->extent_list);
316 kfree(jext);
317 }
318 list_del(&jd->jd_list);
319 iput(jd->jd_inode);
320 kfree(jd);
321 }
322 }
323
324 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
325 {
326 struct gfs2_jdesc *jd;
327 int found = 0;
328
329 list_for_each_entry(jd, head, jd_list) {
330 if (jd->jd_jid == jid) {
331 found = 1;
332 break;
333 }
334 }
335
336 if (!found)
337 jd = NULL;
338
339 return jd;
340 }
341
342 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
343 {
344 struct gfs2_jdesc *jd;
345
346 spin_lock(&sdp->sd_jindex_spin);
347 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
348 spin_unlock(&sdp->sd_jindex_spin);
349
350 return jd;
351 }
352
353 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
354 {
355 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
356 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
357 u64 size = i_size_read(jd->jd_inode);
358
359 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
360 return -EIO;
361
362 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
363
364 if (gfs2_write_alloc_required(ip, 0, size)) {
365 gfs2_consist_inode(ip);
366 return -EIO;
367 }
368
369 return 0;
370 }
371
372 /**
373 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
374 * @sdp: the filesystem
375 *
376 * Returns: errno
377 */
378
379 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
380 {
381 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
382 struct gfs2_glock *j_gl = ip->i_gl;
383 struct gfs2_holder t_gh;
384 struct gfs2_log_header_host head;
385 int error;
386
387 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
388 if (error)
389 return error;
390
391 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
392
393 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
394 if (error)
395 goto fail;
396
397 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
398 gfs2_consist(sdp);
399 error = -EIO;
400 goto fail;
401 }
402
403 /* Initialize some head of the log stuff */
404 sdp->sd_log_sequence = head.lh_sequence + 1;
405 gfs2_log_pointers_init(sdp, head.lh_blkno);
406
407 error = gfs2_quota_init(sdp);
408 if (error)
409 goto fail;
410
411 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
412
413 gfs2_glock_dq_uninit(&t_gh);
414
415 return 0;
416
417 fail:
418 t_gh.gh_flags |= GL_NOCACHE;
419 gfs2_glock_dq_uninit(&t_gh);
420
421 return error;
422 }
423
424 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
425 {
426 const struct gfs2_statfs_change *str = buf;
427
428 sc->sc_total = be64_to_cpu(str->sc_total);
429 sc->sc_free = be64_to_cpu(str->sc_free);
430 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
431 }
432
433 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
434 {
435 struct gfs2_statfs_change *str = buf;
436
437 str->sc_total = cpu_to_be64(sc->sc_total);
438 str->sc_free = cpu_to_be64(sc->sc_free);
439 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
440 }
441
442 int gfs2_statfs_init(struct gfs2_sbd *sdp)
443 {
444 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
445 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
446 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
447 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
448 struct buffer_head *m_bh, *l_bh;
449 struct gfs2_holder gh;
450 int error;
451
452 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
453 &gh);
454 if (error)
455 return error;
456
457 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
458 if (error)
459 goto out;
460
461 if (sdp->sd_args.ar_spectator) {
462 spin_lock(&sdp->sd_statfs_spin);
463 gfs2_statfs_change_in(m_sc, m_bh->b_data +
464 sizeof(struct gfs2_dinode));
465 spin_unlock(&sdp->sd_statfs_spin);
466 } else {
467 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
468 if (error)
469 goto out_m_bh;
470
471 spin_lock(&sdp->sd_statfs_spin);
472 gfs2_statfs_change_in(m_sc, m_bh->b_data +
473 sizeof(struct gfs2_dinode));
474 gfs2_statfs_change_in(l_sc, l_bh->b_data +
475 sizeof(struct gfs2_dinode));
476 spin_unlock(&sdp->sd_statfs_spin);
477
478 brelse(l_bh);
479 }
480
481 out_m_bh:
482 brelse(m_bh);
483 out:
484 gfs2_glock_dq_uninit(&gh);
485 return 0;
486 }
487
488 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
489 s64 dinodes)
490 {
491 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
492 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
493 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
494 struct buffer_head *l_bh;
495 s64 x, y;
496 int need_sync = 0;
497 int error;
498
499 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
500 if (error)
501 return;
502
503 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
504
505 spin_lock(&sdp->sd_statfs_spin);
506 l_sc->sc_total += total;
507 l_sc->sc_free += free;
508 l_sc->sc_dinodes += dinodes;
509 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
510 if (sdp->sd_args.ar_statfs_percent) {
511 x = 100 * l_sc->sc_free;
512 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
513 if (x >= y || x <= -y)
514 need_sync = 1;
515 }
516 spin_unlock(&sdp->sd_statfs_spin);
517
518 brelse(l_bh);
519 if (need_sync)
520 gfs2_wake_up_statfs(sdp);
521 }
522
523 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
524 struct buffer_head *l_bh)
525 {
526 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
527 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
528 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
530
531 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
532
533 spin_lock(&sdp->sd_statfs_spin);
534 m_sc->sc_total += l_sc->sc_total;
535 m_sc->sc_free += l_sc->sc_free;
536 m_sc->sc_dinodes += l_sc->sc_dinodes;
537 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
538 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
539 0, sizeof(struct gfs2_statfs_change));
540 spin_unlock(&sdp->sd_statfs_spin);
541
542 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
543 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
544 }
545
546 int gfs2_statfs_sync(struct super_block *sb, int type)
547 {
548 struct gfs2_sbd *sdp = sb->s_fs_info;
549 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
550 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
551 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
552 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
553 struct gfs2_holder gh;
554 struct buffer_head *m_bh, *l_bh;
555 int error;
556
557 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
558 &gh);
559 if (error)
560 return error;
561
562 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
563 if (error)
564 goto out;
565
566 spin_lock(&sdp->sd_statfs_spin);
567 gfs2_statfs_change_in(m_sc, m_bh->b_data +
568 sizeof(struct gfs2_dinode));
569 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
570 spin_unlock(&sdp->sd_statfs_spin);
571 goto out_bh;
572 }
573 spin_unlock(&sdp->sd_statfs_spin);
574
575 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
576 if (error)
577 goto out_bh;
578
579 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
580 if (error)
581 goto out_bh2;
582
583 update_statfs(sdp, m_bh, l_bh);
584 sdp->sd_statfs_force_sync = 0;
585
586 gfs2_trans_end(sdp);
587
588 out_bh2:
589 brelse(l_bh);
590 out_bh:
591 brelse(m_bh);
592 out:
593 gfs2_glock_dq_uninit(&gh);
594 return error;
595 }
596
597 struct lfcc {
598 struct list_head list;
599 struct gfs2_holder gh;
600 };
601
602 /**
603 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
604 * journals are clean
605 * @sdp: the file system
606 * @state: the state to put the transaction lock into
607 * @t_gh: the hold on the transaction lock
608 *
609 * Returns: errno
610 */
611
612 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
613 struct gfs2_holder *t_gh)
614 {
615 struct gfs2_inode *ip;
616 struct gfs2_jdesc *jd;
617 struct lfcc *lfcc;
618 LIST_HEAD(list);
619 struct gfs2_log_header_host lh;
620 int error;
621
622 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
623 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
624 if (!lfcc) {
625 error = -ENOMEM;
626 goto out;
627 }
628 ip = GFS2_I(jd->jd_inode);
629 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
630 if (error) {
631 kfree(lfcc);
632 goto out;
633 }
634 list_add(&lfcc->list, &list);
635 }
636
637 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
638 GL_NOCACHE, t_gh);
639
640 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
641 error = gfs2_jdesc_check(jd);
642 if (error)
643 break;
644 error = gfs2_find_jhead(jd, &lh);
645 if (error)
646 break;
647 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
648 error = -EBUSY;
649 break;
650 }
651 }
652
653 if (error)
654 gfs2_glock_dq_uninit(t_gh);
655
656 out:
657 while (!list_empty(&list)) {
658 lfcc = list_entry(list.next, struct lfcc, list);
659 list_del(&lfcc->list);
660 gfs2_glock_dq_uninit(&lfcc->gh);
661 kfree(lfcc);
662 }
663 return error;
664 }
665
666 /**
667 * gfs2_freeze_fs - freezes the file system
668 * @sdp: the file system
669 *
670 * This function flushes data and meta data for all machines by
671 * acquiring the transaction log exclusively. All journals are
672 * ensured to be in a clean state as well.
673 *
674 * Returns: errno
675 */
676
677 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
678 {
679 int error = 0;
680
681 mutex_lock(&sdp->sd_freeze_lock);
682
683 if (!sdp->sd_freeze_count++) {
684 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
685 if (error)
686 sdp->sd_freeze_count--;
687 }
688
689 mutex_unlock(&sdp->sd_freeze_lock);
690
691 return error;
692 }
693
694 /**
695 * gfs2_unfreeze_fs - unfreezes the file system
696 * @sdp: the file system
697 *
698 * This function allows the file system to proceed by unlocking
699 * the exclusively held transaction lock. Other GFS2 nodes are
700 * now free to acquire the lock shared and go on with their lives.
701 *
702 */
703
704 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
705 {
706 mutex_lock(&sdp->sd_freeze_lock);
707
708 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
709 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
710
711 mutex_unlock(&sdp->sd_freeze_lock);
712 }
713
714 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
715 {
716 struct gfs2_dinode *str = buf;
717
718 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
719 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
720 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
721 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
722 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
723 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
724 str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
725 str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
726 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
727 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
728 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
729 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
730 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
731 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
732
733 str->di_goal_meta = cpu_to_be64(ip->i_goal);
734 str->di_goal_data = cpu_to_be64(ip->i_goal);
735 str->di_generation = cpu_to_be64(ip->i_generation);
736
737 str->di_flags = cpu_to_be32(ip->i_diskflags);
738 str->di_height = cpu_to_be16(ip->i_height);
739 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
740 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
741 GFS2_FORMAT_DE : 0);
742 str->di_depth = cpu_to_be16(ip->i_depth);
743 str->di_entries = cpu_to_be32(ip->i_entries);
744
745 str->di_eattr = cpu_to_be64(ip->i_eattr);
746 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
747 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
748 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
749 }
750
751 /**
752 * gfs2_write_inode - Make sure the inode is stable on the disk
753 * @inode: The inode
754 * @wbc: The writeback control structure
755 *
756 * Returns: errno
757 */
758
759 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
760 {
761 struct gfs2_inode *ip = GFS2_I(inode);
762 struct gfs2_sbd *sdp = GFS2_SB(inode);
763 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
764 struct backing_dev_info *bdi = metamapping->backing_dev_info;
765 int ret = 0;
766
767 if (wbc->sync_mode == WB_SYNC_ALL)
768 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
769 if (bdi->dirty_exceeded)
770 gfs2_ail1_flush(sdp, wbc);
771 else
772 filemap_fdatawrite(metamapping);
773 if (wbc->sync_mode == WB_SYNC_ALL)
774 ret = filemap_fdatawait(metamapping);
775 if (ret)
776 mark_inode_dirty_sync(inode);
777 return ret;
778 }
779
780 /**
781 * gfs2_dirty_inode - check for atime updates
782 * @inode: The inode in question
783 * @flags: The type of dirty
784 *
785 * Unfortunately it can be called under any combination of inode
786 * glock and transaction lock, so we have to check carefully.
787 *
788 * At the moment this deals only with atime - it should be possible
789 * to expand that role in future, once a review of the locking has
790 * been carried out.
791 */
792
793 static void gfs2_dirty_inode(struct inode *inode, int flags)
794 {
795 struct gfs2_inode *ip = GFS2_I(inode);
796 struct gfs2_sbd *sdp = GFS2_SB(inode);
797 struct buffer_head *bh;
798 struct gfs2_holder gh;
799 int need_unlock = 0;
800 int need_endtrans = 0;
801 int ret;
802
803 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
804 return;
805
806 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
807 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
808 if (ret) {
809 fs_err(sdp, "dirty_inode: glock %d\n", ret);
810 return;
811 }
812 need_unlock = 1;
813 }
814
815 if (current->journal_info == NULL) {
816 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
817 if (ret) {
818 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
819 goto out;
820 }
821 need_endtrans = 1;
822 }
823
824 ret = gfs2_meta_inode_buffer(ip, &bh);
825 if (ret == 0) {
826 gfs2_trans_add_bh(ip->i_gl, bh, 1);
827 gfs2_dinode_out(ip, bh->b_data);
828 brelse(bh);
829 }
830
831 if (need_endtrans)
832 gfs2_trans_end(sdp);
833 out:
834 if (need_unlock)
835 gfs2_glock_dq_uninit(&gh);
836 }
837
838 /**
839 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
840 * @sdp: the filesystem
841 *
842 * Returns: errno
843 */
844
845 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
846 {
847 struct gfs2_holder t_gh;
848 int error;
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 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
855 &t_gh);
856 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
857 return error;
858
859 gfs2_meta_syncfs(sdp);
860 gfs2_log_shutdown(sdp);
861
862 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
863
864 if (t_gh.gh_gl)
865 gfs2_glock_dq_uninit(&t_gh);
866
867 gfs2_quota_cleanup(sdp);
868
869 return error;
870 }
871
872 static int gfs2_umount_recovery_wait(void *word)
873 {
874 schedule();
875 return 0;
876 }
877
878 /**
879 * gfs2_put_super - Unmount the filesystem
880 * @sb: The VFS superblock
881 *
882 */
883
884 static void gfs2_put_super(struct super_block *sb)
885 {
886 struct gfs2_sbd *sdp = sb->s_fs_info;
887 int error;
888 struct gfs2_jdesc *jd;
889
890 /* Unfreeze the filesystem, if we need to */
891
892 mutex_lock(&sdp->sd_freeze_lock);
893 if (sdp->sd_freeze_count)
894 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
895 mutex_unlock(&sdp->sd_freeze_lock);
896
897 /* No more recovery requests */
898 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
899 smp_mb();
900
901 /* Wait on outstanding recovery */
902 restart:
903 spin_lock(&sdp->sd_jindex_spin);
904 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
905 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
906 continue;
907 spin_unlock(&sdp->sd_jindex_spin);
908 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
909 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
910 goto restart;
911 }
912 spin_unlock(&sdp->sd_jindex_spin);
913
914 kthread_stop(sdp->sd_quotad_process);
915 kthread_stop(sdp->sd_logd_process);
916
917 if (!(sb->s_flags & MS_RDONLY)) {
918 error = gfs2_make_fs_ro(sdp);
919 if (error)
920 gfs2_io_error(sdp);
921 }
922 /* At this point, we're through modifying the disk */
923
924 /* Release stuff */
925
926 iput(sdp->sd_jindex);
927 iput(sdp->sd_statfs_inode);
928 iput(sdp->sd_rindex);
929 iput(sdp->sd_quota_inode);
930
931 gfs2_glock_put(sdp->sd_rename_gl);
932 gfs2_glock_put(sdp->sd_trans_gl);
933
934 if (!sdp->sd_args.ar_spectator) {
935 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
936 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
937 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
938 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
939 iput(sdp->sd_sc_inode);
940 iput(sdp->sd_qc_inode);
941 }
942
943 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
944 gfs2_clear_rgrpd(sdp);
945 gfs2_jindex_free(sdp);
946 /* Take apart glock structures and buffer lists */
947 gfs2_gl_hash_clear(sdp);
948 /* Unmount the locking protocol */
949 gfs2_lm_unmount(sdp);
950
951 /* At this point, we're through participating in the lockspace */
952 gfs2_sys_fs_del(sdp);
953 }
954
955 /**
956 * gfs2_sync_fs - sync the filesystem
957 * @sb: the superblock
958 *
959 * Flushes the log to disk.
960 */
961
962 static int gfs2_sync_fs(struct super_block *sb, int wait)
963 {
964 struct gfs2_sbd *sdp = sb->s_fs_info;
965
966 gfs2_quota_sync(sb, -1);
967 if (wait && sdp)
968 gfs2_log_flush(sdp, NULL);
969 return 0;
970 }
971
972 /**
973 * gfs2_freeze - prevent further writes to the filesystem
974 * @sb: the VFS structure for the filesystem
975 *
976 */
977
978 static int gfs2_freeze(struct super_block *sb)
979 {
980 struct gfs2_sbd *sdp = sb->s_fs_info;
981 int error;
982
983 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
984 return -EINVAL;
985
986 for (;;) {
987 error = gfs2_freeze_fs(sdp);
988 if (!error)
989 break;
990
991 switch (error) {
992 case -EBUSY:
993 fs_err(sdp, "waiting for recovery before freeze\n");
994 break;
995
996 default:
997 fs_err(sdp, "error freezing FS: %d\n", error);
998 break;
999 }
1000
1001 fs_err(sdp, "retrying...\n");
1002 msleep(1000);
1003 }
1004 return 0;
1005 }
1006
1007 /**
1008 * gfs2_unfreeze - reallow writes to the filesystem
1009 * @sb: the VFS structure for the filesystem
1010 *
1011 */
1012
1013 static int gfs2_unfreeze(struct super_block *sb)
1014 {
1015 gfs2_unfreeze_fs(sb->s_fs_info);
1016 return 0;
1017 }
1018
1019 /**
1020 * statfs_fill - fill in the sg for a given RG
1021 * @rgd: the RG
1022 * @sc: the sc structure
1023 *
1024 * Returns: 0 on success, -ESTALE if the LVB is invalid
1025 */
1026
1027 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1028 struct gfs2_statfs_change_host *sc)
1029 {
1030 gfs2_rgrp_verify(rgd);
1031 sc->sc_total += rgd->rd_data;
1032 sc->sc_free += rgd->rd_free;
1033 sc->sc_dinodes += rgd->rd_dinodes;
1034 return 0;
1035 }
1036
1037 /**
1038 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1039 * @sdp: the filesystem
1040 * @sc: the sc info that will be returned
1041 *
1042 * Any error (other than a signal) will cause this routine to fall back
1043 * to the synchronous version.
1044 *
1045 * FIXME: This really shouldn't busy wait like this.
1046 *
1047 * Returns: errno
1048 */
1049
1050 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1051 {
1052 struct gfs2_rgrpd *rgd_next;
1053 struct gfs2_holder *gha, *gh;
1054 unsigned int slots = 64;
1055 unsigned int x;
1056 int done;
1057 int error = 0, err;
1058
1059 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1060 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1061 if (!gha)
1062 return -ENOMEM;
1063
1064 rgd_next = gfs2_rgrpd_get_first(sdp);
1065
1066 for (;;) {
1067 done = 1;
1068
1069 for (x = 0; x < slots; x++) {
1070 gh = gha + x;
1071
1072 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1073 err = gfs2_glock_wait(gh);
1074 if (err) {
1075 gfs2_holder_uninit(gh);
1076 error = err;
1077 } else {
1078 if (!error)
1079 error = statfs_slow_fill(
1080 gh->gh_gl->gl_object, sc);
1081 gfs2_glock_dq_uninit(gh);
1082 }
1083 }
1084
1085 if (gh->gh_gl)
1086 done = 0;
1087 else if (rgd_next && !error) {
1088 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1089 LM_ST_SHARED,
1090 GL_ASYNC,
1091 gh);
1092 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1093 done = 0;
1094 }
1095
1096 if (signal_pending(current))
1097 error = -ERESTARTSYS;
1098 }
1099
1100 if (done)
1101 break;
1102
1103 yield();
1104 }
1105
1106 kfree(gha);
1107 return error;
1108 }
1109
1110 /**
1111 * gfs2_statfs_i - Do a statfs
1112 * @sdp: the filesystem
1113 * @sg: the sg structure
1114 *
1115 * Returns: errno
1116 */
1117
1118 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1119 {
1120 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1121 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1122
1123 spin_lock(&sdp->sd_statfs_spin);
1124
1125 *sc = *m_sc;
1126 sc->sc_total += l_sc->sc_total;
1127 sc->sc_free += l_sc->sc_free;
1128 sc->sc_dinodes += l_sc->sc_dinodes;
1129
1130 spin_unlock(&sdp->sd_statfs_spin);
1131
1132 if (sc->sc_free < 0)
1133 sc->sc_free = 0;
1134 if (sc->sc_free > sc->sc_total)
1135 sc->sc_free = sc->sc_total;
1136 if (sc->sc_dinodes < 0)
1137 sc->sc_dinodes = 0;
1138
1139 return 0;
1140 }
1141
1142 /**
1143 * gfs2_statfs - Gather and return stats about the filesystem
1144 * @sb: The superblock
1145 * @statfsbuf: The buffer
1146 *
1147 * Returns: 0 on success or error code
1148 */
1149
1150 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1151 {
1152 struct super_block *sb = dentry->d_inode->i_sb;
1153 struct gfs2_sbd *sdp = sb->s_fs_info;
1154 struct gfs2_statfs_change_host sc;
1155 int error;
1156
1157 error = gfs2_rindex_update(sdp);
1158 if (error)
1159 return error;
1160
1161 if (gfs2_tune_get(sdp, gt_statfs_slow))
1162 error = gfs2_statfs_slow(sdp, &sc);
1163 else
1164 error = gfs2_statfs_i(sdp, &sc);
1165
1166 if (error)
1167 return error;
1168
1169 buf->f_type = GFS2_MAGIC;
1170 buf->f_bsize = sdp->sd_sb.sb_bsize;
1171 buf->f_blocks = sc.sc_total;
1172 buf->f_bfree = sc.sc_free;
1173 buf->f_bavail = sc.sc_free;
1174 buf->f_files = sc.sc_dinodes + sc.sc_free;
1175 buf->f_ffree = sc.sc_free;
1176 buf->f_namelen = GFS2_FNAMESIZE;
1177
1178 return 0;
1179 }
1180
1181 /**
1182 * gfs2_remount_fs - called when the FS is remounted
1183 * @sb: the filesystem
1184 * @flags: the remount flags
1185 * @data: extra data passed in (not used right now)
1186 *
1187 * Returns: errno
1188 */
1189
1190 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1191 {
1192 struct gfs2_sbd *sdp = sb->s_fs_info;
1193 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1194 struct gfs2_tune *gt = &sdp->sd_tune;
1195 int error;
1196
1197 spin_lock(&gt->gt_spin);
1198 args.ar_commit = gt->gt_logd_secs;
1199 args.ar_quota_quantum = gt->gt_quota_quantum;
1200 if (gt->gt_statfs_slow)
1201 args.ar_statfs_quantum = 0;
1202 else
1203 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1204 spin_unlock(&gt->gt_spin);
1205 error = gfs2_mount_args(&args, data);
1206 if (error)
1207 return error;
1208
1209 /* Not allowed to change locking details */
1210 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1211 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1212 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1213 return -EINVAL;
1214
1215 /* Some flags must not be changed */
1216 if (args_neq(&args, &sdp->sd_args, spectator) ||
1217 args_neq(&args, &sdp->sd_args, localflocks) ||
1218 args_neq(&args, &sdp->sd_args, meta))
1219 return -EINVAL;
1220
1221 if (sdp->sd_args.ar_spectator)
1222 *flags |= MS_RDONLY;
1223
1224 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1225 if (*flags & MS_RDONLY)
1226 error = gfs2_make_fs_ro(sdp);
1227 else
1228 error = gfs2_make_fs_rw(sdp);
1229 if (error)
1230 return error;
1231 }
1232
1233 sdp->sd_args = args;
1234 if (sdp->sd_args.ar_posix_acl)
1235 sb->s_flags |= MS_POSIXACL;
1236 else
1237 sb->s_flags &= ~MS_POSIXACL;
1238 if (sdp->sd_args.ar_nobarrier)
1239 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1240 else
1241 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1242 spin_lock(&gt->gt_spin);
1243 gt->gt_logd_secs = args.ar_commit;
1244 gt->gt_quota_quantum = args.ar_quota_quantum;
1245 if (args.ar_statfs_quantum) {
1246 gt->gt_statfs_slow = 0;
1247 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1248 }
1249 else {
1250 gt->gt_statfs_slow = 1;
1251 gt->gt_statfs_quantum = 30;
1252 }
1253 spin_unlock(&gt->gt_spin);
1254
1255 gfs2_online_uevent(sdp);
1256 return 0;
1257 }
1258
1259 /**
1260 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1261 * @inode: The inode to drop
1262 *
1263 * If we've received a callback on an iopen lock then its because a
1264 * remote node tried to deallocate the inode but failed due to this node
1265 * still having the inode open. Here we mark the link count zero
1266 * since we know that it must have reached zero if the GLF_DEMOTE flag
1267 * is set on the iopen glock. If we didn't do a disk read since the
1268 * remote node removed the final link then we might otherwise miss
1269 * this event. This check ensures that this node will deallocate the
1270 * inode's blocks, or alternatively pass the baton on to another
1271 * node for later deallocation.
1272 */
1273
1274 static int gfs2_drop_inode(struct inode *inode)
1275 {
1276 struct gfs2_inode *ip = GFS2_I(inode);
1277
1278 if (inode->i_nlink) {
1279 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1280 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1281 clear_nlink(inode);
1282 }
1283 return generic_drop_inode(inode);
1284 }
1285
1286 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1287 {
1288 do {
1289 if (d1 == d2)
1290 return 1;
1291 d1 = d1->d_parent;
1292 } while (!IS_ROOT(d1));
1293 return 0;
1294 }
1295
1296 /**
1297 * gfs2_show_options - Show mount options for /proc/mounts
1298 * @s: seq_file structure
1299 * @root: root of this (sub)tree
1300 *
1301 * Returns: 0 on success or error code
1302 */
1303
1304 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1305 {
1306 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1307 struct gfs2_args *args = &sdp->sd_args;
1308 int val;
1309
1310 if (is_ancestor(root, sdp->sd_master_dir))
1311 seq_printf(s, ",meta");
1312 if (args->ar_lockproto[0])
1313 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1314 if (args->ar_locktable[0])
1315 seq_printf(s, ",locktable=%s", args->ar_locktable);
1316 if (args->ar_hostdata[0])
1317 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1318 if (args->ar_spectator)
1319 seq_printf(s, ",spectator");
1320 if (args->ar_localflocks)
1321 seq_printf(s, ",localflocks");
1322 if (args->ar_debug)
1323 seq_printf(s, ",debug");
1324 if (args->ar_posix_acl)
1325 seq_printf(s, ",acl");
1326 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1327 char *state;
1328 switch (args->ar_quota) {
1329 case GFS2_QUOTA_OFF:
1330 state = "off";
1331 break;
1332 case GFS2_QUOTA_ACCOUNT:
1333 state = "account";
1334 break;
1335 case GFS2_QUOTA_ON:
1336 state = "on";
1337 break;
1338 default:
1339 state = "unknown";
1340 break;
1341 }
1342 seq_printf(s, ",quota=%s", state);
1343 }
1344 if (args->ar_suiddir)
1345 seq_printf(s, ",suiddir");
1346 if (args->ar_data != GFS2_DATA_DEFAULT) {
1347 char *state;
1348 switch (args->ar_data) {
1349 case GFS2_DATA_WRITEBACK:
1350 state = "writeback";
1351 break;
1352 case GFS2_DATA_ORDERED:
1353 state = "ordered";
1354 break;
1355 default:
1356 state = "unknown";
1357 break;
1358 }
1359 seq_printf(s, ",data=%s", state);
1360 }
1361 if (args->ar_discard)
1362 seq_printf(s, ",discard");
1363 val = sdp->sd_tune.gt_logd_secs;
1364 if (val != 30)
1365 seq_printf(s, ",commit=%d", val);
1366 val = sdp->sd_tune.gt_statfs_quantum;
1367 if (val != 30)
1368 seq_printf(s, ",statfs_quantum=%d", val);
1369 else if (sdp->sd_tune.gt_statfs_slow)
1370 seq_puts(s, ",statfs_quantum=0");
1371 val = sdp->sd_tune.gt_quota_quantum;
1372 if (val != 60)
1373 seq_printf(s, ",quota_quantum=%d", val);
1374 if (args->ar_statfs_percent)
1375 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1376 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1377 const char *state;
1378
1379 switch (args->ar_errors) {
1380 case GFS2_ERRORS_WITHDRAW:
1381 state = "withdraw";
1382 break;
1383 case GFS2_ERRORS_PANIC:
1384 state = "panic";
1385 break;
1386 default:
1387 state = "unknown";
1388 break;
1389 }
1390 seq_printf(s, ",errors=%s", state);
1391 }
1392 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1393 seq_printf(s, ",nobarrier");
1394 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1395 seq_printf(s, ",demote_interface_used");
1396 if (args->ar_rgrplvb)
1397 seq_printf(s, ",rgrplvb");
1398 return 0;
1399 }
1400
1401 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1402 {
1403 struct inode *inode = &ip->i_inode;
1404 struct gfs2_glock *gl = ip->i_gl;
1405
1406 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1407 truncate_inode_pages(&inode->i_data, 0);
1408
1409 if (atomic_read(&gl->gl_revokes) == 0) {
1410 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1411 clear_bit(GLF_DIRTY, &gl->gl_flags);
1412 }
1413 }
1414
1415 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1416 {
1417 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1418 struct gfs2_rgrpd *rgd;
1419 struct gfs2_holder gh;
1420 int error;
1421
1422 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1423 gfs2_consist_inode(ip);
1424 return -EIO;
1425 }
1426
1427 error = gfs2_rindex_update(sdp);
1428 if (error)
1429 return error;
1430
1431 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1432 if (error)
1433 return error;
1434
1435 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1436 if (!rgd) {
1437 gfs2_consist_inode(ip);
1438 error = -EIO;
1439 goto out_qs;
1440 }
1441
1442 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1443 if (error)
1444 goto out_qs;
1445
1446 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1447 sdp->sd_jdesc->jd_blocks);
1448 if (error)
1449 goto out_rg_gunlock;
1450
1451 gfs2_free_di(rgd, ip);
1452
1453 gfs2_final_release_pages(ip);
1454
1455 gfs2_trans_end(sdp);
1456
1457 out_rg_gunlock:
1458 gfs2_glock_dq_uninit(&gh);
1459 out_qs:
1460 gfs2_quota_unhold(ip);
1461 return error;
1462 }
1463
1464 /**
1465 * gfs2_evict_inode - Remove an inode from cache
1466 * @inode: The inode to evict
1467 *
1468 * There are three cases to consider:
1469 * 1. i_nlink == 0, we are final opener (and must deallocate)
1470 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1471 * 3. i_nlink > 0
1472 *
1473 * If the fs is read only, then we have to treat all cases as per #3
1474 * since we are unable to do any deallocation. The inode will be
1475 * deallocated by the next read/write node to attempt an allocation
1476 * in the same resource group
1477 *
1478 * We have to (at the moment) hold the inodes main lock to cover
1479 * the gap between unlocking the shared lock on the iopen lock and
1480 * taking the exclusive lock. I'd rather do a shared -> exclusive
1481 * conversion on the iopen lock, but we can change that later. This
1482 * is safe, just less efficient.
1483 */
1484
1485 static void gfs2_evict_inode(struct inode *inode)
1486 {
1487 struct super_block *sb = inode->i_sb;
1488 struct gfs2_sbd *sdp = sb->s_fs_info;
1489 struct gfs2_inode *ip = GFS2_I(inode);
1490 struct gfs2_holder gh;
1491 int error;
1492
1493 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1494 goto out;
1495
1496 /* Must not read inode block until block type has been verified */
1497 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1498 if (unlikely(error)) {
1499 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1500 goto out;
1501 }
1502
1503 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1504 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1505 if (error)
1506 goto out_truncate;
1507 }
1508
1509 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1510 error = gfs2_inode_refresh(ip);
1511 if (error)
1512 goto out_truncate;
1513 }
1514
1515 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1516 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1517 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1518 error = gfs2_glock_nq(&ip->i_iopen_gh);
1519 if (error)
1520 goto out_truncate;
1521
1522 /* Case 1 starts here */
1523
1524 if (S_ISDIR(inode->i_mode) &&
1525 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1526 error = gfs2_dir_exhash_dealloc(ip);
1527 if (error)
1528 goto out_unlock;
1529 }
1530
1531 if (ip->i_eattr) {
1532 error = gfs2_ea_dealloc(ip);
1533 if (error)
1534 goto out_unlock;
1535 }
1536
1537 if (!gfs2_is_stuffed(ip)) {
1538 error = gfs2_file_dealloc(ip);
1539 if (error)
1540 goto out_unlock;
1541 }
1542
1543 error = gfs2_dinode_dealloc(ip);
1544 goto out_unlock;
1545
1546 out_truncate:
1547 gfs2_log_flush(sdp, ip->i_gl);
1548 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1549 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1550 filemap_fdatawrite(metamapping);
1551 filemap_fdatawait(metamapping);
1552 }
1553 write_inode_now(inode, 1);
1554 gfs2_ail_flush(ip->i_gl, 0);
1555
1556 /* Case 2 starts here */
1557 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1558 if (error)
1559 goto out_unlock;
1560 /* Needs to be done before glock release & also in a transaction */
1561 truncate_inode_pages(&inode->i_data, 0);
1562 gfs2_trans_end(sdp);
1563
1564 out_unlock:
1565 /* Error path for case 1 */
1566 if (gfs2_rs_active(ip->i_res))
1567 gfs2_rs_deltree(ip, ip->i_res);
1568
1569 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1570 gfs2_glock_dq(&ip->i_iopen_gh);
1571 gfs2_holder_uninit(&ip->i_iopen_gh);
1572 gfs2_glock_dq_uninit(&gh);
1573 if (error && error != GLR_TRYFAILED && error != -EROFS)
1574 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1575 out:
1576 /* Case 3 starts here */
1577 truncate_inode_pages(&inode->i_data, 0);
1578 gfs2_rs_delete(ip);
1579 clear_inode(inode);
1580 gfs2_dir_hash_inval(ip);
1581 ip->i_gl->gl_object = NULL;
1582 flush_delayed_work(&ip->i_gl->gl_work);
1583 gfs2_glock_add_to_lru(ip->i_gl);
1584 gfs2_glock_put(ip->i_gl);
1585 ip->i_gl = NULL;
1586 if (ip->i_iopen_gh.gh_gl) {
1587 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1588 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1589 }
1590 }
1591
1592 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1593 {
1594 struct gfs2_inode *ip;
1595
1596 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1597 if (ip) {
1598 ip->i_flags = 0;
1599 ip->i_gl = NULL;
1600 ip->i_rgd = NULL;
1601 ip->i_res = NULL;
1602 }
1603 return &ip->i_inode;
1604 }
1605
1606 static void gfs2_i_callback(struct rcu_head *head)
1607 {
1608 struct inode *inode = container_of(head, struct inode, i_rcu);
1609 kmem_cache_free(gfs2_inode_cachep, inode);
1610 }
1611
1612 static void gfs2_destroy_inode(struct inode *inode)
1613 {
1614 call_rcu(&inode->i_rcu, gfs2_i_callback);
1615 }
1616
1617 const struct super_operations gfs2_super_ops = {
1618 .alloc_inode = gfs2_alloc_inode,
1619 .destroy_inode = gfs2_destroy_inode,
1620 .write_inode = gfs2_write_inode,
1621 .dirty_inode = gfs2_dirty_inode,
1622 .evict_inode = gfs2_evict_inode,
1623 .put_super = gfs2_put_super,
1624 .sync_fs = gfs2_sync_fs,
1625 .freeze_fs = gfs2_freeze,
1626 .unfreeze_fs = gfs2_unfreeze,
1627 .statfs = gfs2_statfs,
1628 .remount_fs = gfs2_remount_fs,
1629 .drop_inode = gfs2_drop_inode,
1630 .show_options = gfs2_show_options,
1631 };
1632
kernel source for telekom puls (alcatel/mediatek)