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Drivers: hv: util: Fix a bug in the KVP code
[linux-2.6/btrfs-unstable.git] / fs / gfs2 / super.c
blob1319b5c4ec68bea0da503caf6e170e0cb196f6fb
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
30 #include "gfs2.h"
31 #include "incore.h"
32 #include "bmap.h"
33 #include "dir.h"
34 #include "glock.h"
35 #include "glops.h"
36 #include "inode.h"
37 #include "log.h"
38 #include "meta_io.h"
39 #include "quota.h"
40 #include "recovery.h"
41 #include "rgrp.h"
42 #include "super.h"
43 #include "trans.h"
44 #include "util.h"
45 #include "sys.h"
46 #include "xattr.h"
47
48 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
49
50 enum {
51 Opt_lockproto,
52 Opt_locktable,
53 Opt_hostdata,
54 Opt_spectator,
55 Opt_ignore_local_fs,
56 Opt_localflocks,
57 Opt_localcaching,
58 Opt_debug,
59 Opt_nodebug,
60 Opt_upgrade,
61 Opt_acl,
62 Opt_noacl,
63 Opt_quota_off,
64 Opt_quota_account,
65 Opt_quota_on,
66 Opt_quota,
67 Opt_noquota,
68 Opt_suiddir,
69 Opt_nosuiddir,
70 Opt_data_writeback,
71 Opt_data_ordered,
72 Opt_meta,
73 Opt_discard,
74 Opt_nodiscard,
75 Opt_commit,
76 Opt_err_withdraw,
77 Opt_err_panic,
78 Opt_statfs_quantum,
79 Opt_statfs_percent,
80 Opt_quota_quantum,
81 Opt_barrier,
82 Opt_nobarrier,
83 Opt_rgrplvb,
84 Opt_norgrplvb,
85 Opt_error,
86 };
87
88 static const match_table_t tokens = {
89 {Opt_lockproto, "lockproto=%s"},
90 {Opt_locktable, "locktable=%s"},
91 {Opt_hostdata, "hostdata=%s"},
92 {Opt_spectator, "spectator"},
93 {Opt_spectator, "norecovery"},
94 {Opt_ignore_local_fs, "ignore_local_fs"},
95 {Opt_localflocks, "localflocks"},
96 {Opt_localcaching, "localcaching"},
97 {Opt_debug, "debug"},
98 {Opt_nodebug, "nodebug"},
99 {Opt_upgrade, "upgrade"},
100 {Opt_acl, "acl"},
101 {Opt_noacl, "noacl"},
102 {Opt_quota_off, "quota=off"},
103 {Opt_quota_account, "quota=account"},
104 {Opt_quota_on, "quota=on"},
105 {Opt_quota, "quota"},
106 {Opt_noquota, "noquota"},
107 {Opt_suiddir, "suiddir"},
108 {Opt_nosuiddir, "nosuiddir"},
109 {Opt_data_writeback, "data=writeback"},
110 {Opt_data_ordered, "data=ordered"},
111 {Opt_meta, "meta"},
112 {Opt_discard, "discard"},
113 {Opt_nodiscard, "nodiscard"},
114 {Opt_commit, "commit=%d"},
115 {Opt_err_withdraw, "errors=withdraw"},
116 {Opt_err_panic, "errors=panic"},
117 {Opt_statfs_quantum, "statfs_quantum=%d"},
118 {Opt_statfs_percent, "statfs_percent=%d"},
119 {Opt_quota_quantum, "quota_quantum=%d"},
120 {Opt_barrier, "barrier"},
121 {Opt_nobarrier, "nobarrier"},
122 {Opt_rgrplvb, "rgrplvb"},
123 {Opt_norgrplvb, "norgrplvb"},
124 {Opt_error, NULL}
125 };
126
127 /**
128 * gfs2_mount_args - Parse mount options
129 * @args: The structure into which the parsed options will be written
130 * @options: The options to parse
131 *
132 * Return: errno
133 */
134
135 int gfs2_mount_args(struct gfs2_args *args, char *options)
136 {
137 char *o;
138 int token;
139 substring_t tmp[MAX_OPT_ARGS];
140 int rv;
141
142 /* Split the options into tokens with the "," character and
143 process them */
144
145 while (1) {
146 o = strsep(&options, ",");
147 if (o == NULL)
148 break;
149 if (*o == '\0')
150 continue;
151
152 token = match_token(o, tokens, tmp);
153 switch (token) {
154 case Opt_lockproto:
155 match_strlcpy(args->ar_lockproto, &tmp[0],
156 GFS2_LOCKNAME_LEN);
157 break;
158 case Opt_locktable:
159 match_strlcpy(args->ar_locktable, &tmp[0],
160 GFS2_LOCKNAME_LEN);
161 break;
162 case Opt_hostdata:
163 match_strlcpy(args->ar_hostdata, &tmp[0],
164 GFS2_LOCKNAME_LEN);
165 break;
166 case Opt_spectator:
167 args->ar_spectator = 1;
168 break;
169 case Opt_ignore_local_fs:
170 /* Retained for backwards compat only */
171 break;
172 case Opt_localflocks:
173 args->ar_localflocks = 1;
174 break;
175 case Opt_localcaching:
176 /* Retained for backwards compat only */
177 break;
178 case Opt_debug:
179 if (args->ar_errors == GFS2_ERRORS_PANIC) {
180 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
181 return -EINVAL;
182 }
183 args->ar_debug = 1;
184 break;
185 case Opt_nodebug:
186 args->ar_debug = 0;
187 break;
188 case Opt_upgrade:
189 /* Retained for backwards compat only */
190 break;
191 case Opt_acl:
192 args->ar_posix_acl = 1;
193 break;
194 case Opt_noacl:
195 args->ar_posix_acl = 0;
196 break;
197 case Opt_quota_off:
198 case Opt_noquota:
199 args->ar_quota = GFS2_QUOTA_OFF;
200 break;
201 case Opt_quota_account:
202 args->ar_quota = GFS2_QUOTA_ACCOUNT;
203 break;
204 case Opt_quota_on:
205 case Opt_quota:
206 args->ar_quota = GFS2_QUOTA_ON;
207 break;
208 case Opt_suiddir:
209 args->ar_suiddir = 1;
210 break;
211 case Opt_nosuiddir:
212 args->ar_suiddir = 0;
213 break;
214 case Opt_data_writeback:
215 args->ar_data = GFS2_DATA_WRITEBACK;
216 break;
217 case Opt_data_ordered:
218 args->ar_data = GFS2_DATA_ORDERED;
219 break;
220 case Opt_meta:
221 args->ar_meta = 1;
222 break;
223 case Opt_discard:
224 args->ar_discard = 1;
225 break;
226 case Opt_nodiscard:
227 args->ar_discard = 0;
228 break;
229 case Opt_commit:
230 rv = match_int(&tmp[0], &args->ar_commit);
231 if (rv || args->ar_commit <= 0) {
232 pr_warn("commit mount option requires a positive numeric argument\n");
233 return rv ? rv : -EINVAL;
234 }
235 break;
236 case Opt_statfs_quantum:
237 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
238 if (rv || args->ar_statfs_quantum < 0) {
239 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
240 return rv ? rv : -EINVAL;
241 }
242 break;
243 case Opt_quota_quantum:
244 rv = match_int(&tmp[0], &args->ar_quota_quantum);
245 if (rv || args->ar_quota_quantum <= 0) {
246 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
247 return rv ? rv : -EINVAL;
248 }
249 break;
250 case Opt_statfs_percent:
251 rv = match_int(&tmp[0], &args->ar_statfs_percent);
252 if (rv || args->ar_statfs_percent < 0 ||
253 args->ar_statfs_percent > 100) {
254 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
255 return rv ? rv : -EINVAL;
256 }
257 break;
258 case Opt_err_withdraw:
259 args->ar_errors = GFS2_ERRORS_WITHDRAW;
260 break;
261 case Opt_err_panic:
262 if (args->ar_debug) {
263 pr_warn("-o debug and -o errors=panic 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 pr_warn("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;
299 struct gfs2_jdesc *jd;
300
301 spin_lock(&sdp->sd_jindex_spin);
302 list_add(&list, &sdp->sd_jindex_list);
303 list_del_init(&sdp->sd_jindex_list);
304 sdp->sd_journals = 0;
305 spin_unlock(&sdp->sd_jindex_spin);
306
307 while (!list_empty(&list)) {
308 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
309 gfs2_free_journal_extents(jd);
310 list_del(&jd->jd_list);
311 iput(jd->jd_inode);
312 kfree(jd);
313 }
314 }
315
316 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
317 {
318 struct gfs2_jdesc *jd;
319 int found = 0;
320
321 list_for_each_entry(jd, head, jd_list) {
322 if (jd->jd_jid == jid) {
323 found = 1;
324 break;
325 }
326 }
327
328 if (!found)
329 jd = NULL;
330
331 return jd;
332 }
333
334 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
335 {
336 struct gfs2_jdesc *jd;
337
338 spin_lock(&sdp->sd_jindex_spin);
339 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
340 spin_unlock(&sdp->sd_jindex_spin);
341
342 return jd;
343 }
344
345 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
346 {
347 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
348 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
349 u64 size = i_size_read(jd->jd_inode);
350
351 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
352 return -EIO;
353
354 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
355
356 if (gfs2_write_alloc_required(ip, 0, size)) {
357 gfs2_consist_inode(ip);
358 return -EIO;
359 }
360
361 return 0;
362 }
363
364 static int init_threads(struct gfs2_sbd *sdp)
365 {
366 struct task_struct *p;
367 int error = 0;
368
369 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
370 if (IS_ERR(p)) {
371 error = PTR_ERR(p);
372 fs_err(sdp, "can't start logd thread: %d\n", error);
373 return error;
374 }
375 sdp->sd_logd_process = p;
376
377 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
378 if (IS_ERR(p)) {
379 error = PTR_ERR(p);
380 fs_err(sdp, "can't start quotad thread: %d\n", error);
381 goto fail;
382 }
383 sdp->sd_quotad_process = p;
384 return 0;
385
386 fail:
387 kthread_stop(sdp->sd_logd_process);
388 return error;
389 }
390
391 /**
392 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
393 * @sdp: the filesystem
394 *
395 * Returns: errno
396 */
397
398 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
399 {
400 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
401 struct gfs2_glock *j_gl = ip->i_gl;
402 struct gfs2_holder thaw_gh;
403 struct gfs2_log_header_host head;
404 int error;
405
406 error = init_threads(sdp);
407 if (error)
408 return error;
409
410 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
411 &thaw_gh);
412 if (error)
413 goto fail_threads;
414
415 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
416
417 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
418 if (error)
419 goto fail;
420
421 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
422 gfs2_consist(sdp);
423 error = -EIO;
424 goto fail;
425 }
426
427 /* Initialize some head of the log stuff */
428 sdp->sd_log_sequence = head.lh_sequence + 1;
429 gfs2_log_pointers_init(sdp, head.lh_blkno);
430
431 error = gfs2_quota_init(sdp);
432 if (error)
433 goto fail;
434
435 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
436
437 gfs2_glock_dq_uninit(&thaw_gh);
438
439 return 0;
440
441 fail:
442 thaw_gh.gh_flags |= GL_NOCACHE;
443 gfs2_glock_dq_uninit(&thaw_gh);
444 fail_threads:
445 kthread_stop(sdp->sd_quotad_process);
446 kthread_stop(sdp->sd_logd_process);
447 return error;
448 }
449
450 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
451 {
452 const struct gfs2_statfs_change *str = buf;
453
454 sc->sc_total = be64_to_cpu(str->sc_total);
455 sc->sc_free = be64_to_cpu(str->sc_free);
456 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
457 }
458
459 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
460 {
461 struct gfs2_statfs_change *str = buf;
462
463 str->sc_total = cpu_to_be64(sc->sc_total);
464 str->sc_free = cpu_to_be64(sc->sc_free);
465 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
466 }
467
468 int gfs2_statfs_init(struct gfs2_sbd *sdp)
469 {
470 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
471 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
472 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
473 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
474 struct buffer_head *m_bh, *l_bh;
475 struct gfs2_holder gh;
476 int error;
477
478 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
479 &gh);
480 if (error)
481 return error;
482
483 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
484 if (error)
485 goto out;
486
487 if (sdp->sd_args.ar_spectator) {
488 spin_lock(&sdp->sd_statfs_spin);
489 gfs2_statfs_change_in(m_sc, m_bh->b_data +
490 sizeof(struct gfs2_dinode));
491 spin_unlock(&sdp->sd_statfs_spin);
492 } else {
493 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
494 if (error)
495 goto out_m_bh;
496
497 spin_lock(&sdp->sd_statfs_spin);
498 gfs2_statfs_change_in(m_sc, m_bh->b_data +
499 sizeof(struct gfs2_dinode));
500 gfs2_statfs_change_in(l_sc, l_bh->b_data +
501 sizeof(struct gfs2_dinode));
502 spin_unlock(&sdp->sd_statfs_spin);
503
504 brelse(l_bh);
505 }
506
507 out_m_bh:
508 brelse(m_bh);
509 out:
510 gfs2_glock_dq_uninit(&gh);
511 return 0;
512 }
513
514 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
515 s64 dinodes)
516 {
517 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
518 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
519 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
520 struct buffer_head *l_bh;
521 s64 x, y;
522 int need_sync = 0;
523 int error;
524
525 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
526 if (error)
527 return;
528
529 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
530
531 spin_lock(&sdp->sd_statfs_spin);
532 l_sc->sc_total += total;
533 l_sc->sc_free += free;
534 l_sc->sc_dinodes += dinodes;
535 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
536 if (sdp->sd_args.ar_statfs_percent) {
537 x = 100 * l_sc->sc_free;
538 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
539 if (x >= y || x <= -y)
540 need_sync = 1;
541 }
542 spin_unlock(&sdp->sd_statfs_spin);
543
544 brelse(l_bh);
545 if (need_sync)
546 gfs2_wake_up_statfs(sdp);
547 }
548
549 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
550 struct buffer_head *l_bh)
551 {
552 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
553 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
554 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
555 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
556
557 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
558
559 spin_lock(&sdp->sd_statfs_spin);
560 m_sc->sc_total += l_sc->sc_total;
561 m_sc->sc_free += l_sc->sc_free;
562 m_sc->sc_dinodes += l_sc->sc_dinodes;
563 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
564 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
565 0, sizeof(struct gfs2_statfs_change));
566 spin_unlock(&sdp->sd_statfs_spin);
567
568 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
569 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
570 }
571
572 int gfs2_statfs_sync(struct super_block *sb, int type)
573 {
574 struct gfs2_sbd *sdp = sb->s_fs_info;
575 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
576 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
577 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
578 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
579 struct gfs2_holder gh;
580 struct buffer_head *m_bh, *l_bh;
581 int error;
582
583 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
584 &gh);
585 if (error)
586 return error;
587
588 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
589 if (error)
590 goto out;
591
592 spin_lock(&sdp->sd_statfs_spin);
593 gfs2_statfs_change_in(m_sc, m_bh->b_data +
594 sizeof(struct gfs2_dinode));
595 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
596 spin_unlock(&sdp->sd_statfs_spin);
597 goto out_bh;
598 }
599 spin_unlock(&sdp->sd_statfs_spin);
600
601 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
602 if (error)
603 goto out_bh;
604
605 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
606 if (error)
607 goto out_bh2;
608
609 update_statfs(sdp, m_bh, l_bh);
610 sdp->sd_statfs_force_sync = 0;
611
612 gfs2_trans_end(sdp);
613
614 out_bh2:
615 brelse(l_bh);
616 out_bh:
617 brelse(m_bh);
618 out:
619 gfs2_glock_dq_uninit(&gh);
620 return error;
621 }
622
623 struct lfcc {
624 struct list_head list;
625 struct gfs2_holder gh;
626 };
627
628 /**
629 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
630 * journals are clean
631 * @sdp: the file system
632 * @state: the state to put the transaction lock into
633 * @t_gh: the hold on the transaction lock
634 *
635 * Returns: errno
636 */
637
638 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
639 struct gfs2_holder *freeze_gh)
640 {
641 struct gfs2_inode *ip;
642 struct gfs2_jdesc *jd;
643 struct lfcc *lfcc;
644 LIST_HEAD(list);
645 struct gfs2_log_header_host lh;
646 struct gfs2_inode *dip = GFS2_I(sdp->sd_root_dir->d_inode);
647 int error;
648
649 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0,
650 &sdp->sd_freeze_root_gh);
651 if (error)
652 return error;
653 atomic_set(&sdp->sd_frozen_root, 1);
654 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
655 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
656 if (!lfcc) {
657 error = -ENOMEM;
658 goto out;
659 }
660 ip = GFS2_I(jd->jd_inode);
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
662 if (error) {
663 kfree(lfcc);
664 goto out;
665 }
666 list_add(&lfcc->list, &list);
667 }
668
669 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
670 GL_NOCACHE, freeze_gh);
671
672 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
673 error = gfs2_jdesc_check(jd);
674 if (error)
675 break;
676 error = gfs2_find_jhead(jd, &lh);
677 if (error)
678 break;
679 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
680 error = -EBUSY;
681 break;
682 }
683 }
684
685 if (error)
686 gfs2_glock_dq_uninit(freeze_gh);
687
688 out:
689 while (!list_empty(&list)) {
690 lfcc = list_entry(list.next, struct lfcc, list);
691 list_del(&lfcc->list);
692 gfs2_glock_dq_uninit(&lfcc->gh);
693 kfree(lfcc);
694 }
695 if (error) {
696 atomic_dec(&sdp->sd_frozen_root);
697 wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
698 gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
699 }
700 return error;
701 }
702
703 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
704 {
705 struct gfs2_dinode *str = buf;
706
707 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
708 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
709 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
710 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
711 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
712 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
713 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
714 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
715 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
716 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
717 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
718 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
719 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
720 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
721
722 str->di_goal_meta = cpu_to_be64(ip->i_goal);
723 str->di_goal_data = cpu_to_be64(ip->i_goal);
724 str->di_generation = cpu_to_be64(ip->i_generation);
725
726 str->di_flags = cpu_to_be32(ip->i_diskflags);
727 str->di_height = cpu_to_be16(ip->i_height);
728 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
729 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
730 GFS2_FORMAT_DE : 0);
731 str->di_depth = cpu_to_be16(ip->i_depth);
732 str->di_entries = cpu_to_be32(ip->i_entries);
733
734 str->di_eattr = cpu_to_be64(ip->i_eattr);
735 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
736 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
737 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
738 }
739
740 /**
741 * gfs2_write_inode - Make sure the inode is stable on the disk
742 * @inode: The inode
743 * @wbc: The writeback control structure
744 *
745 * Returns: errno
746 */
747
748 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
749 {
750 struct gfs2_inode *ip = GFS2_I(inode);
751 struct gfs2_sbd *sdp = GFS2_SB(inode);
752 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
753 struct backing_dev_info *bdi = metamapping->backing_dev_info;
754 int ret = 0;
755
756 if (wbc->sync_mode == WB_SYNC_ALL)
757 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
758 if (bdi->dirty_exceeded)
759 gfs2_ail1_flush(sdp, wbc);
760 else
761 filemap_fdatawrite(metamapping);
762 if (wbc->sync_mode == WB_SYNC_ALL)
763 ret = filemap_fdatawait(metamapping);
764 if (ret)
765 mark_inode_dirty_sync(inode);
766 return ret;
767 }
768
769 /**
770 * gfs2_dirty_inode - check for atime updates
771 * @inode: The inode in question
772 * @flags: The type of dirty
773 *
774 * Unfortunately it can be called under any combination of inode
775 * glock and transaction lock, so we have to check carefully.
776 *
777 * At the moment this deals only with atime - it should be possible
778 * to expand that role in future, once a review of the locking has
779 * been carried out.
780 */
781
782 static void gfs2_dirty_inode(struct inode *inode, int flags)
783 {
784 struct gfs2_inode *ip = GFS2_I(inode);
785 struct gfs2_sbd *sdp = GFS2_SB(inode);
786 struct buffer_head *bh;
787 struct gfs2_holder gh;
788 int need_unlock = 0;
789 int need_endtrans = 0;
790 int ret;
791
792 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
793 return;
794
795 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
796 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
797 if (ret) {
798 fs_err(sdp, "dirty_inode: glock %d\n", ret);
799 return;
800 }
801 need_unlock = 1;
802 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
803 return;
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_meta(ip->i_gl, bh);
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 thaw_gh;
838 int error;
839
840 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
841 &thaw_gh);
842 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
843 return error;
844
845 down_write(&sdp->sd_log_flush_lock);
846 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
847 up_write(&sdp->sd_log_flush_lock);
848
849 kthread_stop(sdp->sd_quotad_process);
850 kthread_stop(sdp->sd_logd_process);
851
852 flush_workqueue(gfs2_delete_workqueue);
853 gfs2_quota_sync(sdp->sd_vfs, 0);
854 gfs2_statfs_sync(sdp->sd_vfs, 0);
855
856 gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
857 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
858
859 if (thaw_gh.gh_gl)
860 gfs2_glock_dq_uninit(&thaw_gh);
861
862 gfs2_quota_cleanup(sdp);
863
864 return error;
865 }
866
867 static int gfs2_umount_recovery_wait(void *word)
868 {
869 schedule();
870 return 0;
871 }
872
873 /**
874 * gfs2_put_super - Unmount the filesystem
875 * @sb: The VFS superblock
876 *
877 */
878
879 static void gfs2_put_super(struct super_block *sb)
880 {
881 struct gfs2_sbd *sdp = sb->s_fs_info;
882 int error;
883 struct gfs2_jdesc *jd;
884
885 /* No more recovery requests */
886 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
887 smp_mb();
888
889 /* Wait on outstanding recovery */
890 restart:
891 spin_lock(&sdp->sd_jindex_spin);
892 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
893 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
894 continue;
895 spin_unlock(&sdp->sd_jindex_spin);
896 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
897 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
898 goto restart;
899 }
900 spin_unlock(&sdp->sd_jindex_spin);
901
902 if (!(sb->s_flags & MS_RDONLY)) {
903 error = gfs2_make_fs_ro(sdp);
904 if (error)
905 gfs2_io_error(sdp);
906 }
907 /* At this point, we're through modifying the disk */
908
909 /* Release stuff */
910
911 iput(sdp->sd_jindex);
912 iput(sdp->sd_statfs_inode);
913 iput(sdp->sd_rindex);
914 iput(sdp->sd_quota_inode);
915
916 gfs2_glock_put(sdp->sd_rename_gl);
917 gfs2_glock_put(sdp->sd_freeze_gl);
918
919 if (!sdp->sd_args.ar_spectator) {
920 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
921 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
922 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
923 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
924 iput(sdp->sd_sc_inode);
925 iput(sdp->sd_qc_inode);
926 }
927
928 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
929 gfs2_clear_rgrpd(sdp);
930 gfs2_jindex_free(sdp);
931 /* Take apart glock structures and buffer lists */
932 gfs2_gl_hash_clear(sdp);
933 /* Unmount the locking protocol */
934 gfs2_lm_unmount(sdp);
935
936 /* At this point, we're through participating in the lockspace */
937 gfs2_sys_fs_del(sdp);
938 }
939
940 /**
941 * gfs2_sync_fs - sync the filesystem
942 * @sb: the superblock
943 *
944 * Flushes the log to disk.
945 */
946
947 static int gfs2_sync_fs(struct super_block *sb, int wait)
948 {
949 struct gfs2_sbd *sdp = sb->s_fs_info;
950
951 gfs2_quota_sync(sb, -1);
952 if (wait && sdp && !atomic_read(&sdp->sd_log_freeze))
953 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
954 return 0;
955 }
956
957 /**
958 * gfs2_freeze - prevent further writes to the filesystem
959 * @sb: the VFS structure for the filesystem
960 *
961 */
962
963 static int gfs2_freeze(struct super_block *sb)
964 {
965 struct gfs2_sbd *sdp = sb->s_fs_info;
966 int error;
967
968 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
969 return -EINVAL;
970
971 for (;;) {
972 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
973 if (!error)
974 break;
975
976 switch (error) {
977 case -EBUSY:
978 fs_err(sdp, "waiting for recovery before freeze\n");
979 break;
980
981 default:
982 fs_err(sdp, "error freezing FS: %d\n", error);
983 break;
984 }
985
986 fs_err(sdp, "retrying...\n");
987 msleep(1000);
988 }
989 return 0;
990 }
991
992 /**
993 * gfs2_unfreeze - reallow writes to the filesystem
994 * @sb: the VFS structure for the filesystem
995 *
996 */
997
998 static int gfs2_unfreeze(struct super_block *sb)
999 {
1000 struct gfs2_sbd *sdp = sb->s_fs_info;
1001
1002 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1003 atomic_dec(&sdp->sd_frozen_root);
1004 wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
1005 gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
1006 return 0;
1007 }
1008
1009 /**
1010 * statfs_fill - fill in the sg for a given RG
1011 * @rgd: the RG
1012 * @sc: the sc structure
1013 *
1014 * Returns: 0 on success, -ESTALE if the LVB is invalid
1015 */
1016
1017 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1018 struct gfs2_statfs_change_host *sc)
1019 {
1020 gfs2_rgrp_verify(rgd);
1021 sc->sc_total += rgd->rd_data;
1022 sc->sc_free += rgd->rd_free;
1023 sc->sc_dinodes += rgd->rd_dinodes;
1024 return 0;
1025 }
1026
1027 /**
1028 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1029 * @sdp: the filesystem
1030 * @sc: the sc info that will be returned
1031 *
1032 * Any error (other than a signal) will cause this routine to fall back
1033 * to the synchronous version.
1034 *
1035 * FIXME: This really shouldn't busy wait like this.
1036 *
1037 * Returns: errno
1038 */
1039
1040 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1041 {
1042 struct gfs2_rgrpd *rgd_next;
1043 struct gfs2_holder *gha, *gh;
1044 unsigned int slots = 64;
1045 unsigned int x;
1046 int done;
1047 int error = 0, err;
1048
1049 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1050 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1051 if (!gha)
1052 return -ENOMEM;
1053
1054 rgd_next = gfs2_rgrpd_get_first(sdp);
1055
1056 for (;;) {
1057 done = 1;
1058
1059 for (x = 0; x < slots; x++) {
1060 gh = gha + x;
1061
1062 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1063 err = gfs2_glock_wait(gh);
1064 if (err) {
1065 gfs2_holder_uninit(gh);
1066 error = err;
1067 } else {
1068 if (!error)
1069 error = statfs_slow_fill(
1070 gh->gh_gl->gl_object, sc);
1071 gfs2_glock_dq_uninit(gh);
1072 }
1073 }
1074
1075 if (gh->gh_gl)
1076 done = 0;
1077 else if (rgd_next && !error) {
1078 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1079 LM_ST_SHARED,
1080 GL_ASYNC,
1081 gh);
1082 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1083 done = 0;
1084 }
1085
1086 if (signal_pending(current))
1087 error = -ERESTARTSYS;
1088 }
1089
1090 if (done)
1091 break;
1092
1093 yield();
1094 }
1095
1096 kfree(gha);
1097 return error;
1098 }
1099
1100 /**
1101 * gfs2_statfs_i - Do a statfs
1102 * @sdp: the filesystem
1103 * @sg: the sg structure
1104 *
1105 * Returns: errno
1106 */
1107
1108 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1109 {
1110 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1111 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1112
1113 spin_lock(&sdp->sd_statfs_spin);
1114
1115 *sc = *m_sc;
1116 sc->sc_total += l_sc->sc_total;
1117 sc->sc_free += l_sc->sc_free;
1118 sc->sc_dinodes += l_sc->sc_dinodes;
1119
1120 spin_unlock(&sdp->sd_statfs_spin);
1121
1122 if (sc->sc_free < 0)
1123 sc->sc_free = 0;
1124 if (sc->sc_free > sc->sc_total)
1125 sc->sc_free = sc->sc_total;
1126 if (sc->sc_dinodes < 0)
1127 sc->sc_dinodes = 0;
1128
1129 return 0;
1130 }
1131
1132 /**
1133 * gfs2_statfs - Gather and return stats about the filesystem
1134 * @sb: The superblock
1135 * @statfsbuf: The buffer
1136 *
1137 * Returns: 0 on success or error code
1138 */
1139
1140 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1141 {
1142 struct super_block *sb = dentry->d_inode->i_sb;
1143 struct gfs2_sbd *sdp = sb->s_fs_info;
1144 struct gfs2_statfs_change_host sc;
1145 int error;
1146
1147 error = gfs2_rindex_update(sdp);
1148 if (error)
1149 return error;
1150
1151 if (gfs2_tune_get(sdp, gt_statfs_slow))
1152 error = gfs2_statfs_slow(sdp, &sc);
1153 else
1154 error = gfs2_statfs_i(sdp, &sc);
1155
1156 if (error)
1157 return error;
1158
1159 buf->f_type = GFS2_MAGIC;
1160 buf->f_bsize = sdp->sd_sb.sb_bsize;
1161 buf->f_blocks = sc.sc_total;
1162 buf->f_bfree = sc.sc_free;
1163 buf->f_bavail = sc.sc_free;
1164 buf->f_files = sc.sc_dinodes + sc.sc_free;
1165 buf->f_ffree = sc.sc_free;
1166 buf->f_namelen = GFS2_FNAMESIZE;
1167
1168 return 0;
1169 }
1170
1171 /**
1172 * gfs2_remount_fs - called when the FS is remounted
1173 * @sb: the filesystem
1174 * @flags: the remount flags
1175 * @data: extra data passed in (not used right now)
1176 *
1177 * Returns: errno
1178 */
1179
1180 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1181 {
1182 struct gfs2_sbd *sdp = sb->s_fs_info;
1183 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1184 struct gfs2_tune *gt = &sdp->sd_tune;
1185 int error;
1186
1187 sync_filesystem(sb);
1188
1189 spin_lock(&gt->gt_spin);
1190 args.ar_commit = gt->gt_logd_secs;
1191 args.ar_quota_quantum = gt->gt_quota_quantum;
1192 if (gt->gt_statfs_slow)
1193 args.ar_statfs_quantum = 0;
1194 else
1195 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1196 spin_unlock(&gt->gt_spin);
1197 error = gfs2_mount_args(&args, data);
1198 if (error)
1199 return error;
1200
1201 /* Not allowed to change locking details */
1202 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1203 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1204 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1205 return -EINVAL;
1206
1207 /* Some flags must not be changed */
1208 if (args_neq(&args, &sdp->sd_args, spectator) ||
1209 args_neq(&args, &sdp->sd_args, localflocks) ||
1210 args_neq(&args, &sdp->sd_args, meta))
1211 return -EINVAL;
1212
1213 if (sdp->sd_args.ar_spectator)
1214 *flags |= MS_RDONLY;
1215
1216 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1217 if (*flags & MS_RDONLY)
1218 error = gfs2_make_fs_ro(sdp);
1219 else
1220 error = gfs2_make_fs_rw(sdp);
1221 if (error)
1222 return error;
1223 }
1224
1225 sdp->sd_args = args;
1226 if (sdp->sd_args.ar_posix_acl)
1227 sb->s_flags |= MS_POSIXACL;
1228 else
1229 sb->s_flags &= ~MS_POSIXACL;
1230 if (sdp->sd_args.ar_nobarrier)
1231 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1232 else
1233 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1234 spin_lock(&gt->gt_spin);
1235 gt->gt_logd_secs = args.ar_commit;
1236 gt->gt_quota_quantum = args.ar_quota_quantum;
1237 if (args.ar_statfs_quantum) {
1238 gt->gt_statfs_slow = 0;
1239 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1240 }
1241 else {
1242 gt->gt_statfs_slow = 1;
1243 gt->gt_statfs_quantum = 30;
1244 }
1245 spin_unlock(&gt->gt_spin);
1246
1247 gfs2_online_uevent(sdp);
1248 return 0;
1249 }
1250
1251 /**
1252 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1253 * @inode: The inode to drop
1254 *
1255 * If we've received a callback on an iopen lock then its because a
1256 * remote node tried to deallocate the inode but failed due to this node
1257 * still having the inode open. Here we mark the link count zero
1258 * since we know that it must have reached zero if the GLF_DEMOTE flag
1259 * is set on the iopen glock. If we didn't do a disk read since the
1260 * remote node removed the final link then we might otherwise miss
1261 * this event. This check ensures that this node will deallocate the
1262 * inode's blocks, or alternatively pass the baton on to another
1263 * node for later deallocation.
1264 */
1265
1266 static int gfs2_drop_inode(struct inode *inode)
1267 {
1268 struct gfs2_inode *ip = GFS2_I(inode);
1269
1270 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
1271 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1272 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1273 clear_nlink(inode);
1274 }
1275 return generic_drop_inode(inode);
1276 }
1277
1278 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1279 {
1280 do {
1281 if (d1 == d2)
1282 return 1;
1283 d1 = d1->d_parent;
1284 } while (!IS_ROOT(d1));
1285 return 0;
1286 }
1287
1288 /**
1289 * gfs2_show_options - Show mount options for /proc/mounts
1290 * @s: seq_file structure
1291 * @root: root of this (sub)tree
1292 *
1293 * Returns: 0 on success or error code
1294 */
1295
1296 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1297 {
1298 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1299 struct gfs2_args *args = &sdp->sd_args;
1300 int val;
1301
1302 if (is_ancestor(root, sdp->sd_master_dir))
1303 seq_printf(s, ",meta");
1304 if (args->ar_lockproto[0])
1305 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1306 if (args->ar_locktable[0])
1307 seq_printf(s, ",locktable=%s", args->ar_locktable);
1308 if (args->ar_hostdata[0])
1309 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1310 if (args->ar_spectator)
1311 seq_printf(s, ",spectator");
1312 if (args->ar_localflocks)
1313 seq_printf(s, ",localflocks");
1314 if (args->ar_debug)
1315 seq_printf(s, ",debug");
1316 if (args->ar_posix_acl)
1317 seq_printf(s, ",acl");
1318 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1319 char *state;
1320 switch (args->ar_quota) {
1321 case GFS2_QUOTA_OFF:
1322 state = "off";
1323 break;
1324 case GFS2_QUOTA_ACCOUNT:
1325 state = "account";
1326 break;
1327 case GFS2_QUOTA_ON:
1328 state = "on";
1329 break;
1330 default:
1331 state = "unknown";
1332 break;
1333 }
1334 seq_printf(s, ",quota=%s", state);
1335 }
1336 if (args->ar_suiddir)
1337 seq_printf(s, ",suiddir");
1338 if (args->ar_data != GFS2_DATA_DEFAULT) {
1339 char *state;
1340 switch (args->ar_data) {
1341 case GFS2_DATA_WRITEBACK:
1342 state = "writeback";
1343 break;
1344 case GFS2_DATA_ORDERED:
1345 state = "ordered";
1346 break;
1347 default:
1348 state = "unknown";
1349 break;
1350 }
1351 seq_printf(s, ",data=%s", state);
1352 }
1353 if (args->ar_discard)
1354 seq_printf(s, ",discard");
1355 val = sdp->sd_tune.gt_logd_secs;
1356 if (val != 30)
1357 seq_printf(s, ",commit=%d", val);
1358 val = sdp->sd_tune.gt_statfs_quantum;
1359 if (val != 30)
1360 seq_printf(s, ",statfs_quantum=%d", val);
1361 else if (sdp->sd_tune.gt_statfs_slow)
1362 seq_puts(s, ",statfs_quantum=0");
1363 val = sdp->sd_tune.gt_quota_quantum;
1364 if (val != 60)
1365 seq_printf(s, ",quota_quantum=%d", val);
1366 if (args->ar_statfs_percent)
1367 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1368 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1369 const char *state;
1370
1371 switch (args->ar_errors) {
1372 case GFS2_ERRORS_WITHDRAW:
1373 state = "withdraw";
1374 break;
1375 case GFS2_ERRORS_PANIC:
1376 state = "panic";
1377 break;
1378 default:
1379 state = "unknown";
1380 break;
1381 }
1382 seq_printf(s, ",errors=%s", state);
1383 }
1384 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1385 seq_printf(s, ",nobarrier");
1386 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1387 seq_printf(s, ",demote_interface_used");
1388 if (args->ar_rgrplvb)
1389 seq_printf(s, ",rgrplvb");
1390 return 0;
1391 }
1392
1393 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1394 {
1395 struct inode *inode = &ip->i_inode;
1396 struct gfs2_glock *gl = ip->i_gl;
1397
1398 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1399 truncate_inode_pages(&inode->i_data, 0);
1400
1401 if (atomic_read(&gl->gl_revokes) == 0) {
1402 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1403 clear_bit(GLF_DIRTY, &gl->gl_flags);
1404 }
1405 }
1406
1407 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1408 {
1409 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1410 struct gfs2_rgrpd *rgd;
1411 struct gfs2_holder gh;
1412 int error;
1413
1414 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1415 gfs2_consist_inode(ip);
1416 return -EIO;
1417 }
1418
1419 error = gfs2_rindex_update(sdp);
1420 if (error)
1421 return error;
1422
1423 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1424 if (error)
1425 return error;
1426
1427 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1428 if (!rgd) {
1429 gfs2_consist_inode(ip);
1430 error = -EIO;
1431 goto out_qs;
1432 }
1433
1434 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1435 if (error)
1436 goto out_qs;
1437
1438 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1439 sdp->sd_jdesc->jd_blocks);
1440 if (error)
1441 goto out_rg_gunlock;
1442
1443 gfs2_free_di(rgd, ip);
1444
1445 gfs2_final_release_pages(ip);
1446
1447 gfs2_trans_end(sdp);
1448
1449 out_rg_gunlock:
1450 gfs2_glock_dq_uninit(&gh);
1451 out_qs:
1452 gfs2_quota_unhold(ip);
1453 return error;
1454 }
1455
1456 /**
1457 * gfs2_evict_inode - Remove an inode from cache
1458 * @inode: The inode to evict
1459 *
1460 * There are three cases to consider:
1461 * 1. i_nlink == 0, we are final opener (and must deallocate)
1462 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1463 * 3. i_nlink > 0
1464 *
1465 * If the fs is read only, then we have to treat all cases as per #3
1466 * since we are unable to do any deallocation. The inode will be
1467 * deallocated by the next read/write node to attempt an allocation
1468 * in the same resource group
1469 *
1470 * We have to (at the moment) hold the inodes main lock to cover
1471 * the gap between unlocking the shared lock on the iopen lock and
1472 * taking the exclusive lock. I'd rather do a shared -> exclusive
1473 * conversion on the iopen lock, but we can change that later. This
1474 * is safe, just less efficient.
1475 */
1476
1477 static void gfs2_evict_inode(struct inode *inode)
1478 {
1479 struct super_block *sb = inode->i_sb;
1480 struct gfs2_sbd *sdp = sb->s_fs_info;
1481 struct gfs2_inode *ip = GFS2_I(inode);
1482 struct gfs2_holder gh;
1483 int error;
1484
1485 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1486 clear_inode(inode);
1487 return;
1488 }
1489
1490 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1491 goto out;
1492
1493 /* Must not read inode block until block type has been verified */
1494 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1495 if (unlikely(error)) {
1496 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1497 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1498 goto out;
1499 }
1500
1501 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1502 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1503 if (error)
1504 goto out_truncate;
1505 }
1506
1507 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1508 error = gfs2_inode_refresh(ip);
1509 if (error)
1510 goto out_truncate;
1511 }
1512
1513 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1514 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1515 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1516 error = gfs2_glock_nq(&ip->i_iopen_gh);
1517 if (error)
1518 goto out_truncate;
1519
1520 /* Case 1 starts here */
1521
1522 if (S_ISDIR(inode->i_mode) &&
1523 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1524 error = gfs2_dir_exhash_dealloc(ip);
1525 if (error)
1526 goto out_unlock;
1527 }
1528
1529 if (ip->i_eattr) {
1530 error = gfs2_ea_dealloc(ip);
1531 if (error)
1532 goto out_unlock;
1533 }
1534
1535 if (!gfs2_is_stuffed(ip)) {
1536 error = gfs2_file_dealloc(ip);
1537 if (error)
1538 goto out_unlock;
1539 }
1540
1541 error = gfs2_dinode_dealloc(ip);
1542 goto out_unlock;
1543
1544 out_truncate:
1545 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1546 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1547 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1548 filemap_fdatawrite(metamapping);
1549 filemap_fdatawait(metamapping);
1550 }
1551 write_inode_now(inode, 1);
1552 gfs2_ail_flush(ip->i_gl, 0);
1553
1554 /* Case 2 starts here */
1555 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1556 if (error)
1557 goto out_unlock;
1558 /* Needs to be done before glock release & also in a transaction */
1559 truncate_inode_pages(&inode->i_data, 0);
1560 gfs2_trans_end(sdp);
1561
1562 out_unlock:
1563 /* Error path for case 1 */
1564 if (gfs2_rs_active(ip->i_res))
1565 gfs2_rs_deltree(ip->i_res);
1566
1567 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1568 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1569 gfs2_glock_dq(&ip->i_iopen_gh);
1570 }
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_final(&inode->i_data);
1578 gfs2_rs_delete(ip, NULL);
1579 gfs2_ordered_del_inode(ip);
1580 clear_inode(inode);
1581 gfs2_dir_hash_inval(ip);
1582 ip->i_gl->gl_object = NULL;
1583 flush_delayed_work(&ip->i_gl->gl_work);
1584 gfs2_glock_add_to_lru(ip->i_gl);
1585 gfs2_glock_put(ip->i_gl);
1586 ip->i_gl = NULL;
1587 if (ip->i_iopen_gh.gh_gl) {
1588 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1589 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1590 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1591 }
1592 }
1593
1594 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1595 {
1596 struct gfs2_inode *ip;
1597
1598 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1599 if (ip) {
1600 ip->i_flags = 0;
1601 ip->i_gl = NULL;
1602 ip->i_rgd = NULL;
1603 ip->i_res = NULL;
1604 }
1605 return &ip->i_inode;
1606 }
1607
1608 static void gfs2_i_callback(struct rcu_head *head)
1609 {
1610 struct inode *inode = container_of(head, struct inode, i_rcu);
1611 kmem_cache_free(gfs2_inode_cachep, inode);
1612 }
1613
1614 static void gfs2_destroy_inode(struct inode *inode)
1615 {
1616 call_rcu(&inode->i_rcu, gfs2_i_callback);
1617 }
1618
1619 const struct super_operations gfs2_super_ops = {
1620 .alloc_inode = gfs2_alloc_inode,
1621 .destroy_inode = gfs2_destroy_inode,
1622 .write_inode = gfs2_write_inode,
1623 .dirty_inode = gfs2_dirty_inode,
1624 .evict_inode = gfs2_evict_inode,
1625 .put_super = gfs2_put_super,
1626 .sync_fs = gfs2_sync_fs,
1627 .freeze_fs = gfs2_freeze,
1628 .unfreeze_fs = gfs2_unfreeze,
1629 .statfs = gfs2_statfs,
1630 .remount_fs = gfs2_remount_fs,
1631 .drop_inode = gfs2_drop_inode,
1632 .show_options = gfs2_show_options,
1633 };
1634
(deprecated) Btrfs devel tree