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misc: ibmvsm: Fix potential NULL pointer dereference
[linux/fpc-iii.git] / fs / gfs2 / super.c
blobca71163ff7cfda20234c434a1932ecbff72ed267
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/signal.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/completion.h>
17 #include <linux/buffer_head.h>
18 #include <linux/statfs.h>
19 #include <linux/seq_file.h>
20 #include <linux/mount.h>
21 #include <linux/kthread.h>
22 #include <linux/delay.h>
23 #include <linux/gfs2_ondisk.h>
24 #include <linux/crc32.h>
25 #include <linux/time.h>
26 #include <linux/wait.h>
27 #include <linux/writeback.h>
28 #include <linux/backing-dev.h>
29 #include <linux/kernel.h>
30
31 #include "gfs2.h"
32 #include "incore.h"
33 #include "bmap.h"
34 #include "dir.h"
35 #include "glock.h"
36 #include "glops.h"
37 #include "inode.h"
38 #include "log.h"
39 #include "meta_io.h"
40 #include "quota.h"
41 #include "recovery.h"
42 #include "rgrp.h"
43 #include "super.h"
44 #include "trans.h"
45 #include "util.h"
46 #include "sys.h"
47 #include "xattr.h"
48
49 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
50
51 enum {
52 Opt_lockproto,
53 Opt_locktable,
54 Opt_hostdata,
55 Opt_spectator,
56 Opt_ignore_local_fs,
57 Opt_localflocks,
58 Opt_localcaching,
59 Opt_debug,
60 Opt_nodebug,
61 Opt_upgrade,
62 Opt_acl,
63 Opt_noacl,
64 Opt_quota_off,
65 Opt_quota_account,
66 Opt_quota_on,
67 Opt_quota,
68 Opt_noquota,
69 Opt_suiddir,
70 Opt_nosuiddir,
71 Opt_data_writeback,
72 Opt_data_ordered,
73 Opt_meta,
74 Opt_discard,
75 Opt_nodiscard,
76 Opt_commit,
77 Opt_err_withdraw,
78 Opt_err_panic,
79 Opt_statfs_quantum,
80 Opt_statfs_percent,
81 Opt_quota_quantum,
82 Opt_barrier,
83 Opt_nobarrier,
84 Opt_rgrplvb,
85 Opt_norgrplvb,
86 Opt_loccookie,
87 Opt_noloccookie,
88 Opt_error,
89 };
90
91 static const match_table_t tokens = {
92 {Opt_lockproto, "lockproto=%s"},
93 {Opt_locktable, "locktable=%s"},
94 {Opt_hostdata, "hostdata=%s"},
95 {Opt_spectator, "spectator"},
96 {Opt_spectator, "norecovery"},
97 {Opt_ignore_local_fs, "ignore_local_fs"},
98 {Opt_localflocks, "localflocks"},
99 {Opt_localcaching, "localcaching"},
100 {Opt_debug, "debug"},
101 {Opt_nodebug, "nodebug"},
102 {Opt_upgrade, "upgrade"},
103 {Opt_acl, "acl"},
104 {Opt_noacl, "noacl"},
105 {Opt_quota_off, "quota=off"},
106 {Opt_quota_account, "quota=account"},
107 {Opt_quota_on, "quota=on"},
108 {Opt_quota, "quota"},
109 {Opt_noquota, "noquota"},
110 {Opt_suiddir, "suiddir"},
111 {Opt_nosuiddir, "nosuiddir"},
112 {Opt_data_writeback, "data=writeback"},
113 {Opt_data_ordered, "data=ordered"},
114 {Opt_meta, "meta"},
115 {Opt_discard, "discard"},
116 {Opt_nodiscard, "nodiscard"},
117 {Opt_commit, "commit=%d"},
118 {Opt_err_withdraw, "errors=withdraw"},
119 {Opt_err_panic, "errors=panic"},
120 {Opt_statfs_quantum, "statfs_quantum=%d"},
121 {Opt_statfs_percent, "statfs_percent=%d"},
122 {Opt_quota_quantum, "quota_quantum=%d"},
123 {Opt_barrier, "barrier"},
124 {Opt_nobarrier, "nobarrier"},
125 {Opt_rgrplvb, "rgrplvb"},
126 {Opt_norgrplvb, "norgrplvb"},
127 {Opt_loccookie, "loccookie"},
128 {Opt_noloccookie, "noloccookie"},
129 {Opt_error, NULL}
130 };
131
132 /**
133 * gfs2_mount_args - Parse mount options
134 * @args: The structure into which the parsed options will be written
135 * @options: The options to parse
136 *
137 * Return: errno
138 */
139
140 int gfs2_mount_args(struct gfs2_args *args, char *options)
141 {
142 char *o;
143 int token;
144 substring_t tmp[MAX_OPT_ARGS];
145 int rv;
146
147 /* Split the options into tokens with the "," character and
148 process them */
149
150 while (1) {
151 o = strsep(&options, ",");
152 if (o == NULL)
153 break;
154 if (*o == '\0')
155 continue;
156
157 token = match_token(o, tokens, tmp);
158 switch (token) {
159 case Opt_lockproto:
160 match_strlcpy(args->ar_lockproto, &tmp[0],
161 GFS2_LOCKNAME_LEN);
162 break;
163 case Opt_locktable:
164 match_strlcpy(args->ar_locktable, &tmp[0],
165 GFS2_LOCKNAME_LEN);
166 break;
167 case Opt_hostdata:
168 match_strlcpy(args->ar_hostdata, &tmp[0],
169 GFS2_LOCKNAME_LEN);
170 break;
171 case Opt_spectator:
172 args->ar_spectator = 1;
173 break;
174 case Opt_ignore_local_fs:
175 /* Retained for backwards compat only */
176 break;
177 case Opt_localflocks:
178 args->ar_localflocks = 1;
179 break;
180 case Opt_localcaching:
181 /* Retained for backwards compat only */
182 break;
183 case Opt_debug:
184 if (args->ar_errors == GFS2_ERRORS_PANIC) {
185 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
186 return -EINVAL;
187 }
188 args->ar_debug = 1;
189 break;
190 case Opt_nodebug:
191 args->ar_debug = 0;
192 break;
193 case Opt_upgrade:
194 /* Retained for backwards compat only */
195 break;
196 case Opt_acl:
197 args->ar_posix_acl = 1;
198 break;
199 case Opt_noacl:
200 args->ar_posix_acl = 0;
201 break;
202 case Opt_quota_off:
203 case Opt_noquota:
204 args->ar_quota = GFS2_QUOTA_OFF;
205 break;
206 case Opt_quota_account:
207 args->ar_quota = GFS2_QUOTA_ACCOUNT;
208 break;
209 case Opt_quota_on:
210 case Opt_quota:
211 args->ar_quota = GFS2_QUOTA_ON;
212 break;
213 case Opt_suiddir:
214 args->ar_suiddir = 1;
215 break;
216 case Opt_nosuiddir:
217 args->ar_suiddir = 0;
218 break;
219 case Opt_data_writeback:
220 args->ar_data = GFS2_DATA_WRITEBACK;
221 break;
222 case Opt_data_ordered:
223 args->ar_data = GFS2_DATA_ORDERED;
224 break;
225 case Opt_meta:
226 args->ar_meta = 1;
227 break;
228 case Opt_discard:
229 args->ar_discard = 1;
230 break;
231 case Opt_nodiscard:
232 args->ar_discard = 0;
233 break;
234 case Opt_commit:
235 rv = match_int(&tmp[0], &args->ar_commit);
236 if (rv || args->ar_commit <= 0) {
237 pr_warn("commit mount option requires a positive numeric argument\n");
238 return rv ? rv : -EINVAL;
239 }
240 break;
241 case Opt_statfs_quantum:
242 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
243 if (rv || args->ar_statfs_quantum < 0) {
244 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
245 return rv ? rv : -EINVAL;
246 }
247 break;
248 case Opt_quota_quantum:
249 rv = match_int(&tmp[0], &args->ar_quota_quantum);
250 if (rv || args->ar_quota_quantum <= 0) {
251 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
252 return rv ? rv : -EINVAL;
253 }
254 break;
255 case Opt_statfs_percent:
256 rv = match_int(&tmp[0], &args->ar_statfs_percent);
257 if (rv || args->ar_statfs_percent < 0 ||
258 args->ar_statfs_percent > 100) {
259 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
260 return rv ? rv : -EINVAL;
261 }
262 break;
263 case Opt_err_withdraw:
264 args->ar_errors = GFS2_ERRORS_WITHDRAW;
265 break;
266 case Opt_err_panic:
267 if (args->ar_debug) {
268 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
269 return -EINVAL;
270 }
271 args->ar_errors = GFS2_ERRORS_PANIC;
272 break;
273 case Opt_barrier:
274 args->ar_nobarrier = 0;
275 break;
276 case Opt_nobarrier:
277 args->ar_nobarrier = 1;
278 break;
279 case Opt_rgrplvb:
280 args->ar_rgrplvb = 1;
281 break;
282 case Opt_norgrplvb:
283 args->ar_rgrplvb = 0;
284 break;
285 case Opt_loccookie:
286 args->ar_loccookie = 1;
287 break;
288 case Opt_noloccookie:
289 args->ar_loccookie = 0;
290 break;
291 case Opt_error:
292 default:
293 pr_warn("invalid mount option: %s\n", o);
294 return -EINVAL;
295 }
296 }
297
298 return 0;
299 }
300
301 /**
302 * gfs2_jindex_free - Clear all the journal index information
303 * @sdp: The GFS2 superblock
304 *
305 */
306
307 void gfs2_jindex_free(struct gfs2_sbd *sdp)
308 {
309 struct list_head list;
310 struct gfs2_jdesc *jd;
311
312 spin_lock(&sdp->sd_jindex_spin);
313 list_add(&list, &sdp->sd_jindex_list);
314 list_del_init(&sdp->sd_jindex_list);
315 sdp->sd_journals = 0;
316 spin_unlock(&sdp->sd_jindex_spin);
317
318 while (!list_empty(&list)) {
319 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
320 gfs2_free_journal_extents(jd);
321 list_del(&jd->jd_list);
322 iput(jd->jd_inode);
323 kfree(jd);
324 }
325 }
326
327 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
328 {
329 struct gfs2_jdesc *jd;
330 int found = 0;
331
332 list_for_each_entry(jd, head, jd_list) {
333 if (jd->jd_jid == jid) {
334 found = 1;
335 break;
336 }
337 }
338
339 if (!found)
340 jd = NULL;
341
342 return jd;
343 }
344
345 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
346 {
347 struct gfs2_jdesc *jd;
348
349 spin_lock(&sdp->sd_jindex_spin);
350 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
351 spin_unlock(&sdp->sd_jindex_spin);
352
353 return jd;
354 }
355
356 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
357 {
358 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
359 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
360 u64 size = i_size_read(jd->jd_inode);
361
362 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
363 return -EIO;
364
365 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
366
367 if (gfs2_write_alloc_required(ip, 0, size)) {
368 gfs2_consist_inode(ip);
369 return -EIO;
370 }
371
372 return 0;
373 }
374
375 static int init_threads(struct gfs2_sbd *sdp)
376 {
377 struct task_struct *p;
378 int error = 0;
379
380 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
381 if (IS_ERR(p)) {
382 error = PTR_ERR(p);
383 fs_err(sdp, "can't start logd thread: %d\n", error);
384 return error;
385 }
386 sdp->sd_logd_process = p;
387
388 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
389 if (IS_ERR(p)) {
390 error = PTR_ERR(p);
391 fs_err(sdp, "can't start quotad thread: %d\n", error);
392 goto fail;
393 }
394 sdp->sd_quotad_process = p;
395 return 0;
396
397 fail:
398 kthread_stop(sdp->sd_logd_process);
399 return error;
400 }
401
402 /**
403 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
404 * @sdp: the filesystem
405 *
406 * Returns: errno
407 */
408
409 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
410 {
411 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
412 struct gfs2_glock *j_gl = ip->i_gl;
413 struct gfs2_holder freeze_gh;
414 struct gfs2_log_header_host head;
415 int error;
416
417 error = init_threads(sdp);
418 if (error)
419 return error;
420
421 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
422 &freeze_gh);
423 if (error)
424 goto fail_threads;
425
426 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
427
428 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
429 if (error)
430 goto fail;
431
432 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
433 gfs2_consist(sdp);
434 error = -EIO;
435 goto fail;
436 }
437
438 /* Initialize some head of the log stuff */
439 sdp->sd_log_sequence = head.lh_sequence + 1;
440 gfs2_log_pointers_init(sdp, head.lh_blkno);
441
442 error = gfs2_quota_init(sdp);
443 if (error)
444 goto fail;
445
446 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
447
448 gfs2_glock_dq_uninit(&freeze_gh);
449
450 return 0;
451
452 fail:
453 freeze_gh.gh_flags |= GL_NOCACHE;
454 gfs2_glock_dq_uninit(&freeze_gh);
455 fail_threads:
456 kthread_stop(sdp->sd_quotad_process);
457 kthread_stop(sdp->sd_logd_process);
458 return error;
459 }
460
461 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
462 {
463 const struct gfs2_statfs_change *str = buf;
464
465 sc->sc_total = be64_to_cpu(str->sc_total);
466 sc->sc_free = be64_to_cpu(str->sc_free);
467 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
468 }
469
470 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
471 {
472 struct gfs2_statfs_change *str = buf;
473
474 str->sc_total = cpu_to_be64(sc->sc_total);
475 str->sc_free = cpu_to_be64(sc->sc_free);
476 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
477 }
478
479 int gfs2_statfs_init(struct gfs2_sbd *sdp)
480 {
481 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
482 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
483 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
484 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
485 struct buffer_head *m_bh, *l_bh;
486 struct gfs2_holder gh;
487 int error;
488
489 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
490 &gh);
491 if (error)
492 return error;
493
494 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
495 if (error)
496 goto out;
497
498 if (sdp->sd_args.ar_spectator) {
499 spin_lock(&sdp->sd_statfs_spin);
500 gfs2_statfs_change_in(m_sc, m_bh->b_data +
501 sizeof(struct gfs2_dinode));
502 spin_unlock(&sdp->sd_statfs_spin);
503 } else {
504 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
505 if (error)
506 goto out_m_bh;
507
508 spin_lock(&sdp->sd_statfs_spin);
509 gfs2_statfs_change_in(m_sc, m_bh->b_data +
510 sizeof(struct gfs2_dinode));
511 gfs2_statfs_change_in(l_sc, l_bh->b_data +
512 sizeof(struct gfs2_dinode));
513 spin_unlock(&sdp->sd_statfs_spin);
514
515 brelse(l_bh);
516 }
517
518 out_m_bh:
519 brelse(m_bh);
520 out:
521 gfs2_glock_dq_uninit(&gh);
522 return 0;
523 }
524
525 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
526 s64 dinodes)
527 {
528 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
530 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
531 struct buffer_head *l_bh;
532 s64 x, y;
533 int need_sync = 0;
534 int error;
535
536 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
537 if (error)
538 return;
539
540 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
541
542 spin_lock(&sdp->sd_statfs_spin);
543 l_sc->sc_total += total;
544 l_sc->sc_free += free;
545 l_sc->sc_dinodes += dinodes;
546 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
547 if (sdp->sd_args.ar_statfs_percent) {
548 x = 100 * l_sc->sc_free;
549 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
550 if (x >= y || x <= -y)
551 need_sync = 1;
552 }
553 spin_unlock(&sdp->sd_statfs_spin);
554
555 brelse(l_bh);
556 if (need_sync)
557 gfs2_wake_up_statfs(sdp);
558 }
559
560 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
561 struct buffer_head *l_bh)
562 {
563 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
564 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
565 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
566 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
567
568 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
569 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
570
571 spin_lock(&sdp->sd_statfs_spin);
572 m_sc->sc_total += l_sc->sc_total;
573 m_sc->sc_free += l_sc->sc_free;
574 m_sc->sc_dinodes += l_sc->sc_dinodes;
575 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
576 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
577 0, sizeof(struct gfs2_statfs_change));
578 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
579 spin_unlock(&sdp->sd_statfs_spin);
580 }
581
582 int gfs2_statfs_sync(struct super_block *sb, int type)
583 {
584 struct gfs2_sbd *sdp = sb->s_fs_info;
585 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
586 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
587 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
588 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
589 struct gfs2_holder gh;
590 struct buffer_head *m_bh, *l_bh;
591 int error;
592
593 sb_start_write(sb);
594 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
595 &gh);
596 if (error)
597 goto out;
598
599 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
600 if (error)
601 goto out_unlock;
602
603 spin_lock(&sdp->sd_statfs_spin);
604 gfs2_statfs_change_in(m_sc, m_bh->b_data +
605 sizeof(struct gfs2_dinode));
606 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
607 spin_unlock(&sdp->sd_statfs_spin);
608 goto out_bh;
609 }
610 spin_unlock(&sdp->sd_statfs_spin);
611
612 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
613 if (error)
614 goto out_bh;
615
616 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
617 if (error)
618 goto out_bh2;
619
620 update_statfs(sdp, m_bh, l_bh);
621 sdp->sd_statfs_force_sync = 0;
622
623 gfs2_trans_end(sdp);
624
625 out_bh2:
626 brelse(l_bh);
627 out_bh:
628 brelse(m_bh);
629 out_unlock:
630 gfs2_glock_dq_uninit(&gh);
631 out:
632 sb_end_write(sb);
633 return error;
634 }
635
636 struct lfcc {
637 struct list_head list;
638 struct gfs2_holder gh;
639 };
640
641 /**
642 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
643 * journals are clean
644 * @sdp: the file system
645 * @state: the state to put the transaction lock into
646 * @t_gh: the hold on the transaction lock
647 *
648 * Returns: errno
649 */
650
651 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
652 struct gfs2_holder *freeze_gh)
653 {
654 struct gfs2_inode *ip;
655 struct gfs2_jdesc *jd;
656 struct lfcc *lfcc;
657 LIST_HEAD(list);
658 struct gfs2_log_header_host lh;
659 int error;
660
661 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
662 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
663 if (!lfcc) {
664 error = -ENOMEM;
665 goto out;
666 }
667 ip = GFS2_I(jd->jd_inode);
668 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
669 if (error) {
670 kfree(lfcc);
671 goto out;
672 }
673 list_add(&lfcc->list, &list);
674 }
675
676 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
677 GL_NOCACHE, freeze_gh);
678
679 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
680 error = gfs2_jdesc_check(jd);
681 if (error)
682 break;
683 error = gfs2_find_jhead(jd, &lh);
684 if (error)
685 break;
686 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
687 error = -EBUSY;
688 break;
689 }
690 }
691
692 if (error)
693 gfs2_glock_dq_uninit(freeze_gh);
694
695 out:
696 while (!list_empty(&list)) {
697 lfcc = list_entry(list.next, struct lfcc, list);
698 list_del(&lfcc->list);
699 gfs2_glock_dq_uninit(&lfcc->gh);
700 kfree(lfcc);
701 }
702 return error;
703 }
704
705 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
706 {
707 struct gfs2_dinode *str = buf;
708
709 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
710 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
711 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
712 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
713 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
714 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
715 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
716 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
717 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
718 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
719 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
720 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
721 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
722 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
723
724 str->di_goal_meta = cpu_to_be64(ip->i_goal);
725 str->di_goal_data = cpu_to_be64(ip->i_goal);
726 str->di_generation = cpu_to_be64(ip->i_generation);
727
728 str->di_flags = cpu_to_be32(ip->i_diskflags);
729 str->di_height = cpu_to_be16(ip->i_height);
730 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
731 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
732 GFS2_FORMAT_DE : 0);
733 str->di_depth = cpu_to_be16(ip->i_depth);
734 str->di_entries = cpu_to_be32(ip->i_entries);
735
736 str->di_eattr = cpu_to_be64(ip->i_eattr);
737 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
738 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
739 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
740 }
741
742 /**
743 * gfs2_write_inode - Make sure the inode is stable on the disk
744 * @inode: The inode
745 * @wbc: The writeback control structure
746 *
747 * Returns: errno
748 */
749
750 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
751 {
752 struct gfs2_inode *ip = GFS2_I(inode);
753 struct gfs2_sbd *sdp = GFS2_SB(inode);
754 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
755 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
756 int ret = 0;
757 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
758
759 if (flush_all)
760 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
761 GFS2_LOG_HEAD_FLUSH_NORMAL |
762 GFS2_LFC_WRITE_INODE);
763 if (bdi->wb.dirty_exceeded)
764 gfs2_ail1_flush(sdp, wbc);
765 else
766 filemap_fdatawrite(metamapping);
767 if (flush_all)
768 ret = filemap_fdatawait(metamapping);
769 if (ret)
770 mark_inode_dirty_sync(inode);
771 else {
772 spin_lock(&inode->i_lock);
773 if (!(inode->i_flags & I_DIRTY))
774 gfs2_ordered_del_inode(ip);
775 spin_unlock(&inode->i_lock);
776 }
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_INODE))
804 return;
805 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
806 return;
807 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
808 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
809 if (ret) {
810 fs_err(sdp, "dirty_inode: glock %d\n", ret);
811 return;
812 }
813 need_unlock = 1;
814 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
815 return;
816
817 if (current->journal_info == NULL) {
818 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
819 if (ret) {
820 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
821 goto out;
822 }
823 need_endtrans = 1;
824 }
825
826 ret = gfs2_meta_inode_buffer(ip, &bh);
827 if (ret == 0) {
828 gfs2_trans_add_meta(ip->i_gl, bh);
829 gfs2_dinode_out(ip, bh->b_data);
830 brelse(bh);
831 }
832
833 if (need_endtrans)
834 gfs2_trans_end(sdp);
835 out:
836 if (need_unlock)
837 gfs2_glock_dq_uninit(&gh);
838 }
839
840 /**
841 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
842 * @sdp: the filesystem
843 *
844 * Returns: errno
845 */
846
847 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
848 {
849 struct gfs2_holder freeze_gh;
850 int error;
851
852 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
853 &freeze_gh);
854 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
855 return error;
856
857 flush_workqueue(gfs2_delete_workqueue);
858 kthread_stop(sdp->sd_quotad_process);
859 kthread_stop(sdp->sd_logd_process);
860
861 gfs2_quota_sync(sdp->sd_vfs, 0);
862 gfs2_statfs_sync(sdp->sd_vfs, 0);
863
864 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
865 GFS2_LFC_MAKE_FS_RO);
866 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
867 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
868
869 if (gfs2_holder_initialized(&freeze_gh))
870 gfs2_glock_dq_uninit(&freeze_gh);
871
872 gfs2_quota_cleanup(sdp);
873
874 return error;
875 }
876
877 /**
878 * gfs2_put_super - Unmount the filesystem
879 * @sb: The VFS superblock
880 *
881 */
882
883 static void gfs2_put_super(struct super_block *sb)
884 {
885 struct gfs2_sbd *sdp = sb->s_fs_info;
886 int error;
887 struct gfs2_jdesc *jd;
888
889 /* No more recovery requests */
890 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
891 smp_mb();
892
893 /* Wait on outstanding recovery */
894 restart:
895 spin_lock(&sdp->sd_jindex_spin);
896 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
897 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
898 continue;
899 spin_unlock(&sdp->sd_jindex_spin);
900 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
901 TASK_UNINTERRUPTIBLE);
902 goto restart;
903 }
904 spin_unlock(&sdp->sd_jindex_spin);
905
906 if (!sb_rdonly(sb)) {
907 error = gfs2_make_fs_ro(sdp);
908 if (error)
909 gfs2_io_error(sdp);
910 }
911 /* At this point, we're through modifying the disk */
912
913 /* Release stuff */
914
915 iput(sdp->sd_jindex);
916 iput(sdp->sd_statfs_inode);
917 iput(sdp->sd_rindex);
918 iput(sdp->sd_quota_inode);
919
920 gfs2_glock_put(sdp->sd_rename_gl);
921 gfs2_glock_put(sdp->sd_freeze_gl);
922
923 if (!sdp->sd_args.ar_spectator) {
924 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
925 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
926 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
927 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
928 iput(sdp->sd_sc_inode);
929 iput(sdp->sd_qc_inode);
930 }
931
932 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
933 gfs2_clear_rgrpd(sdp);
934 gfs2_jindex_free(sdp);
935 /* Take apart glock structures and buffer lists */
936 gfs2_gl_hash_clear(sdp);
937 gfs2_delete_debugfs_file(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
956 gfs2_quota_sync(sb, -1);
957 if (wait)
958 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
959 GFS2_LFC_SYNC_FS);
960 return sdp->sd_log_error;
961 }
962
963 void gfs2_freeze_func(struct work_struct *work)
964 {
965 int error;
966 struct gfs2_holder freeze_gh;
967 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
968 struct super_block *sb = sdp->sd_vfs;
969
970 atomic_inc(&sb->s_active);
971 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
972 &freeze_gh);
973 if (error) {
974 printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error);
975 gfs2_assert_withdraw(sdp, 0);
976 }
977 else {
978 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
979 error = thaw_super(sb);
980 if (error) {
981 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
982 error);
983 gfs2_assert_withdraw(sdp, 0);
984 }
985 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
986 freeze_gh.gh_flags |= GL_NOCACHE;
987 gfs2_glock_dq_uninit(&freeze_gh);
988 }
989 deactivate_super(sb);
990 return;
991 }
992
993 /**
994 * gfs2_freeze - prevent further writes to the filesystem
995 * @sb: the VFS structure for the filesystem
996 *
997 */
998
999 static int gfs2_freeze(struct super_block *sb)
1000 {
1001 struct gfs2_sbd *sdp = sb->s_fs_info;
1002 int error = 0;
1003
1004 mutex_lock(&sdp->sd_freeze_mutex);
1005 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
1006 goto out;
1007
1008 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
1009 error = -EINVAL;
1010 goto out;
1011 }
1012
1013 for (;;) {
1014 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1015 if (!error)
1016 break;
1017
1018 switch (error) {
1019 case -EBUSY:
1020 fs_err(sdp, "waiting for recovery before freeze\n");
1021 break;
1022
1023 default:
1024 fs_err(sdp, "error freezing FS: %d\n", error);
1025 break;
1026 }
1027
1028 fs_err(sdp, "retrying...\n");
1029 msleep(1000);
1030 }
1031 error = 0;
1032 out:
1033 mutex_unlock(&sdp->sd_freeze_mutex);
1034 return error;
1035 }
1036
1037 /**
1038 * gfs2_unfreeze - reallow writes to the filesystem
1039 * @sb: the VFS structure for the filesystem
1040 *
1041 */
1042
1043 static int gfs2_unfreeze(struct super_block *sb)
1044 {
1045 struct gfs2_sbd *sdp = sb->s_fs_info;
1046
1047 mutex_lock(&sdp->sd_freeze_mutex);
1048 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1049 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1050 mutex_unlock(&sdp->sd_freeze_mutex);
1051 return 0;
1052 }
1053
1054 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1055 mutex_unlock(&sdp->sd_freeze_mutex);
1056 return 0;
1057 }
1058
1059 /**
1060 * statfs_fill - fill in the sg for a given RG
1061 * @rgd: the RG
1062 * @sc: the sc structure
1063 *
1064 * Returns: 0 on success, -ESTALE if the LVB is invalid
1065 */
1066
1067 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1068 struct gfs2_statfs_change_host *sc)
1069 {
1070 gfs2_rgrp_verify(rgd);
1071 sc->sc_total += rgd->rd_data;
1072 sc->sc_free += rgd->rd_free;
1073 sc->sc_dinodes += rgd->rd_dinodes;
1074 return 0;
1075 }
1076
1077 /**
1078 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1079 * @sdp: the filesystem
1080 * @sc: the sc info that will be returned
1081 *
1082 * Any error (other than a signal) will cause this routine to fall back
1083 * to the synchronous version.
1084 *
1085 * FIXME: This really shouldn't busy wait like this.
1086 *
1087 * Returns: errno
1088 */
1089
1090 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1091 {
1092 struct gfs2_rgrpd *rgd_next;
1093 struct gfs2_holder *gha, *gh;
1094 unsigned int slots = 64;
1095 unsigned int x;
1096 int done;
1097 int error = 0, err;
1098
1099 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1100 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1101 if (!gha)
1102 return -ENOMEM;
1103 for (x = 0; x < slots; x++)
1104 gfs2_holder_mark_uninitialized(gha + x);
1105
1106 rgd_next = gfs2_rgrpd_get_first(sdp);
1107
1108 for (;;) {
1109 done = 1;
1110
1111 for (x = 0; x < slots; x++) {
1112 gh = gha + x;
1113
1114 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1115 err = gfs2_glock_wait(gh);
1116 if (err) {
1117 gfs2_holder_uninit(gh);
1118 error = err;
1119 } else {
1120 if (!error) {
1121 struct gfs2_rgrpd *rgd =
1122 gfs2_glock2rgrp(gh->gh_gl);
1123
1124 error = statfs_slow_fill(rgd, sc);
1125 }
1126 gfs2_glock_dq_uninit(gh);
1127 }
1128 }
1129
1130 if (gfs2_holder_initialized(gh))
1131 done = 0;
1132 else if (rgd_next && !error) {
1133 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1134 LM_ST_SHARED,
1135 GL_ASYNC,
1136 gh);
1137 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1138 done = 0;
1139 }
1140
1141 if (signal_pending(current))
1142 error = -ERESTARTSYS;
1143 }
1144
1145 if (done)
1146 break;
1147
1148 yield();
1149 }
1150
1151 kfree(gha);
1152 return error;
1153 }
1154
1155 /**
1156 * gfs2_statfs_i - Do a statfs
1157 * @sdp: the filesystem
1158 * @sg: the sg structure
1159 *
1160 * Returns: errno
1161 */
1162
1163 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1164 {
1165 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1166 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1167
1168 spin_lock(&sdp->sd_statfs_spin);
1169
1170 *sc = *m_sc;
1171 sc->sc_total += l_sc->sc_total;
1172 sc->sc_free += l_sc->sc_free;
1173 sc->sc_dinodes += l_sc->sc_dinodes;
1174
1175 spin_unlock(&sdp->sd_statfs_spin);
1176
1177 if (sc->sc_free < 0)
1178 sc->sc_free = 0;
1179 if (sc->sc_free > sc->sc_total)
1180 sc->sc_free = sc->sc_total;
1181 if (sc->sc_dinodes < 0)
1182 sc->sc_dinodes = 0;
1183
1184 return 0;
1185 }
1186
1187 /**
1188 * gfs2_statfs - Gather and return stats about the filesystem
1189 * @sb: The superblock
1190 * @statfsbuf: The buffer
1191 *
1192 * Returns: 0 on success or error code
1193 */
1194
1195 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1196 {
1197 struct super_block *sb = dentry->d_sb;
1198 struct gfs2_sbd *sdp = sb->s_fs_info;
1199 struct gfs2_statfs_change_host sc;
1200 int error;
1201
1202 error = gfs2_rindex_update(sdp);
1203 if (error)
1204 return error;
1205
1206 if (gfs2_tune_get(sdp, gt_statfs_slow))
1207 error = gfs2_statfs_slow(sdp, &sc);
1208 else
1209 error = gfs2_statfs_i(sdp, &sc);
1210
1211 if (error)
1212 return error;
1213
1214 buf->f_type = GFS2_MAGIC;
1215 buf->f_bsize = sdp->sd_sb.sb_bsize;
1216 buf->f_blocks = sc.sc_total;
1217 buf->f_bfree = sc.sc_free;
1218 buf->f_bavail = sc.sc_free;
1219 buf->f_files = sc.sc_dinodes + sc.sc_free;
1220 buf->f_ffree = sc.sc_free;
1221 buf->f_namelen = GFS2_FNAMESIZE;
1222
1223 return 0;
1224 }
1225
1226 /**
1227 * gfs2_remount_fs - called when the FS is remounted
1228 * @sb: the filesystem
1229 * @flags: the remount flags
1230 * @data: extra data passed in (not used right now)
1231 *
1232 * Returns: errno
1233 */
1234
1235 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1236 {
1237 struct gfs2_sbd *sdp = sb->s_fs_info;
1238 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1239 struct gfs2_tune *gt = &sdp->sd_tune;
1240 int error;
1241
1242 sync_filesystem(sb);
1243
1244 spin_lock(&gt->gt_spin);
1245 args.ar_commit = gt->gt_logd_secs;
1246 args.ar_quota_quantum = gt->gt_quota_quantum;
1247 if (gt->gt_statfs_slow)
1248 args.ar_statfs_quantum = 0;
1249 else
1250 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1251 spin_unlock(&gt->gt_spin);
1252 error = gfs2_mount_args(&args, data);
1253 if (error)
1254 return error;
1255
1256 /* Not allowed to change locking details */
1257 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1258 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1259 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1260 return -EINVAL;
1261
1262 /* Some flags must not be changed */
1263 if (args_neq(&args, &sdp->sd_args, spectator) ||
1264 args_neq(&args, &sdp->sd_args, localflocks) ||
1265 args_neq(&args, &sdp->sd_args, meta))
1266 return -EINVAL;
1267
1268 if (sdp->sd_args.ar_spectator)
1269 *flags |= SB_RDONLY;
1270
1271 if ((sb->s_flags ^ *flags) & SB_RDONLY) {
1272 if (*flags & SB_RDONLY)
1273 error = gfs2_make_fs_ro(sdp);
1274 else
1275 error = gfs2_make_fs_rw(sdp);
1276 if (error)
1277 return error;
1278 }
1279
1280 sdp->sd_args = args;
1281 if (sdp->sd_args.ar_posix_acl)
1282 sb->s_flags |= SB_POSIXACL;
1283 else
1284 sb->s_flags &= ~SB_POSIXACL;
1285 if (sdp->sd_args.ar_nobarrier)
1286 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1287 else
1288 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1289 spin_lock(&gt->gt_spin);
1290 gt->gt_logd_secs = args.ar_commit;
1291 gt->gt_quota_quantum = args.ar_quota_quantum;
1292 if (args.ar_statfs_quantum) {
1293 gt->gt_statfs_slow = 0;
1294 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1295 }
1296 else {
1297 gt->gt_statfs_slow = 1;
1298 gt->gt_statfs_quantum = 30;
1299 }
1300 spin_unlock(&gt->gt_spin);
1301
1302 gfs2_online_uevent(sdp);
1303 return 0;
1304 }
1305
1306 /**
1307 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1308 * @inode: The inode to drop
1309 *
1310 * If we've received a callback on an iopen lock then it's because a
1311 * remote node tried to deallocate the inode but failed due to this node
1312 * still having the inode open. Here we mark the link count zero
1313 * since we know that it must have reached zero if the GLF_DEMOTE flag
1314 * is set on the iopen glock. If we didn't do a disk read since the
1315 * remote node removed the final link then we might otherwise miss
1316 * this event. This check ensures that this node will deallocate the
1317 * inode's blocks, or alternatively pass the baton on to another
1318 * node for later deallocation.
1319 */
1320
1321 static int gfs2_drop_inode(struct inode *inode)
1322 {
1323 struct gfs2_inode *ip = GFS2_I(inode);
1324
1325 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1326 inode->i_nlink &&
1327 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1328 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1329 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1330 clear_nlink(inode);
1331 }
1332
1333 /*
1334 * When under memory pressure when an inode's link count has dropped to
1335 * zero, defer deleting the inode to the delete workqueue. This avoids
1336 * calling into DLM under memory pressure, which can deadlock.
1337 */
1338 if (!inode->i_nlink &&
1339 unlikely(current->flags & PF_MEMALLOC) &&
1340 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1341 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1342
1343 gfs2_glock_hold(gl);
1344 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1345 gfs2_glock_queue_put(gl);
1346 return false;
1347 }
1348
1349 return generic_drop_inode(inode);
1350 }
1351
1352 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1353 {
1354 do {
1355 if (d1 == d2)
1356 return 1;
1357 d1 = d1->d_parent;
1358 } while (!IS_ROOT(d1));
1359 return 0;
1360 }
1361
1362 /**
1363 * gfs2_show_options - Show mount options for /proc/mounts
1364 * @s: seq_file structure
1365 * @root: root of this (sub)tree
1366 *
1367 * Returns: 0 on success or error code
1368 */
1369
1370 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1371 {
1372 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1373 struct gfs2_args *args = &sdp->sd_args;
1374 int val;
1375
1376 if (is_ancestor(root, sdp->sd_master_dir))
1377 seq_puts(s, ",meta");
1378 if (args->ar_lockproto[0])
1379 seq_show_option(s, "lockproto", args->ar_lockproto);
1380 if (args->ar_locktable[0])
1381 seq_show_option(s, "locktable", args->ar_locktable);
1382 if (args->ar_hostdata[0])
1383 seq_show_option(s, "hostdata", args->ar_hostdata);
1384 if (args->ar_spectator)
1385 seq_puts(s, ",spectator");
1386 if (args->ar_localflocks)
1387 seq_puts(s, ",localflocks");
1388 if (args->ar_debug)
1389 seq_puts(s, ",debug");
1390 if (args->ar_posix_acl)
1391 seq_puts(s, ",acl");
1392 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1393 char *state;
1394 switch (args->ar_quota) {
1395 case GFS2_QUOTA_OFF:
1396 state = "off";
1397 break;
1398 case GFS2_QUOTA_ACCOUNT:
1399 state = "account";
1400 break;
1401 case GFS2_QUOTA_ON:
1402 state = "on";
1403 break;
1404 default:
1405 state = "unknown";
1406 break;
1407 }
1408 seq_printf(s, ",quota=%s", state);
1409 }
1410 if (args->ar_suiddir)
1411 seq_puts(s, ",suiddir");
1412 if (args->ar_data != GFS2_DATA_DEFAULT) {
1413 char *state;
1414 switch (args->ar_data) {
1415 case GFS2_DATA_WRITEBACK:
1416 state = "writeback";
1417 break;
1418 case GFS2_DATA_ORDERED:
1419 state = "ordered";
1420 break;
1421 default:
1422 state = "unknown";
1423 break;
1424 }
1425 seq_printf(s, ",data=%s", state);
1426 }
1427 if (args->ar_discard)
1428 seq_puts(s, ",discard");
1429 val = sdp->sd_tune.gt_logd_secs;
1430 if (val != 30)
1431 seq_printf(s, ",commit=%d", val);
1432 val = sdp->sd_tune.gt_statfs_quantum;
1433 if (val != 30)
1434 seq_printf(s, ",statfs_quantum=%d", val);
1435 else if (sdp->sd_tune.gt_statfs_slow)
1436 seq_puts(s, ",statfs_quantum=0");
1437 val = sdp->sd_tune.gt_quota_quantum;
1438 if (val != 60)
1439 seq_printf(s, ",quota_quantum=%d", val);
1440 if (args->ar_statfs_percent)
1441 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1442 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1443 const char *state;
1444
1445 switch (args->ar_errors) {
1446 case GFS2_ERRORS_WITHDRAW:
1447 state = "withdraw";
1448 break;
1449 case GFS2_ERRORS_PANIC:
1450 state = "panic";
1451 break;
1452 default:
1453 state = "unknown";
1454 break;
1455 }
1456 seq_printf(s, ",errors=%s", state);
1457 }
1458 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1459 seq_puts(s, ",nobarrier");
1460 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1461 seq_puts(s, ",demote_interface_used");
1462 if (args->ar_rgrplvb)
1463 seq_puts(s, ",rgrplvb");
1464 if (args->ar_loccookie)
1465 seq_puts(s, ",loccookie");
1466 return 0;
1467 }
1468
1469 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1470 {
1471 struct inode *inode = &ip->i_inode;
1472 struct gfs2_glock *gl = ip->i_gl;
1473
1474 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1475 truncate_inode_pages(&inode->i_data, 0);
1476
1477 if (atomic_read(&gl->gl_revokes) == 0) {
1478 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1479 clear_bit(GLF_DIRTY, &gl->gl_flags);
1480 }
1481 }
1482
1483 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1484 {
1485 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1486 struct gfs2_rgrpd *rgd;
1487 struct gfs2_holder gh;
1488 int error;
1489
1490 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1491 gfs2_consist_inode(ip);
1492 return -EIO;
1493 }
1494
1495 error = gfs2_rindex_update(sdp);
1496 if (error)
1497 return error;
1498
1499 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1500 if (error)
1501 return error;
1502
1503 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1504 if (!rgd) {
1505 gfs2_consist_inode(ip);
1506 error = -EIO;
1507 goto out_qs;
1508 }
1509
1510 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1511 if (error)
1512 goto out_qs;
1513
1514 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1515 sdp->sd_jdesc->jd_blocks);
1516 if (error)
1517 goto out_rg_gunlock;
1518
1519 gfs2_free_di(rgd, ip);
1520
1521 gfs2_final_release_pages(ip);
1522
1523 gfs2_trans_end(sdp);
1524
1525 out_rg_gunlock:
1526 gfs2_glock_dq_uninit(&gh);
1527 out_qs:
1528 gfs2_quota_unhold(ip);
1529 return error;
1530 }
1531
1532 /**
1533 * gfs2_glock_put_eventually
1534 * @gl: The glock to put
1535 *
1536 * When under memory pressure, trigger a deferred glock put to make sure we
1537 * won't call into DLM and deadlock. Otherwise, put the glock directly.
1538 */
1539
1540 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1541 {
1542 if (current->flags & PF_MEMALLOC)
1543 gfs2_glock_queue_put(gl);
1544 else
1545 gfs2_glock_put(gl);
1546 }
1547
1548 /**
1549 * gfs2_evict_inode - Remove an inode from cache
1550 * @inode: The inode to evict
1551 *
1552 * There are three cases to consider:
1553 * 1. i_nlink == 0, we are final opener (and must deallocate)
1554 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1555 * 3. i_nlink > 0
1556 *
1557 * If the fs is read only, then we have to treat all cases as per #3
1558 * since we are unable to do any deallocation. The inode will be
1559 * deallocated by the next read/write node to attempt an allocation
1560 * in the same resource group
1561 *
1562 * We have to (at the moment) hold the inodes main lock to cover
1563 * the gap between unlocking the shared lock on the iopen lock and
1564 * taking the exclusive lock. I'd rather do a shared -> exclusive
1565 * conversion on the iopen lock, but we can change that later. This
1566 * is safe, just less efficient.
1567 */
1568
1569 static void gfs2_evict_inode(struct inode *inode)
1570 {
1571 struct super_block *sb = inode->i_sb;
1572 struct gfs2_sbd *sdp = sb->s_fs_info;
1573 struct gfs2_inode *ip = GFS2_I(inode);
1574 struct gfs2_holder gh;
1575 struct address_space *metamapping;
1576 int error;
1577
1578 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1579 clear_inode(inode);
1580 return;
1581 }
1582
1583 if (inode->i_nlink || sb_rdonly(sb))
1584 goto out;
1585
1586 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1587 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1588 gfs2_holder_mark_uninitialized(&gh);
1589 goto alloc_failed;
1590 }
1591
1592 /* Deletes should never happen under memory pressure anymore. */
1593 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1594 goto out;
1595
1596 /* Must not read inode block until block type has been verified */
1597 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1598 if (unlikely(error)) {
1599 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1600 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1601 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1602 goto out;
1603 }
1604
1605 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1606 if (error)
1607 goto out_truncate;
1608
1609 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1610 error = gfs2_inode_refresh(ip);
1611 if (error)
1612 goto out_truncate;
1613 }
1614
1615 /*
1616 * The inode may have been recreated in the meantime.
1617 */
1618 if (inode->i_nlink)
1619 goto out_truncate;
1620
1621 alloc_failed:
1622 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1623 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1624 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1625 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1626 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1627 &ip->i_iopen_gh);
1628 error = gfs2_glock_nq(&ip->i_iopen_gh);
1629 if (error)
1630 goto out_truncate;
1631 }
1632
1633 /* Case 1 starts here */
1634
1635 if (S_ISDIR(inode->i_mode) &&
1636 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1637 error = gfs2_dir_exhash_dealloc(ip);
1638 if (error)
1639 goto out_unlock;
1640 }
1641
1642 if (ip->i_eattr) {
1643 error = gfs2_ea_dealloc(ip);
1644 if (error)
1645 goto out_unlock;
1646 }
1647
1648 if (!gfs2_is_stuffed(ip)) {
1649 error = gfs2_file_dealloc(ip);
1650 if (error)
1651 goto out_unlock;
1652 }
1653
1654 /* We're about to clear the bitmap for the dinode, but as soon as we
1655 do, gfs2_create_inode can create another inode at the same block
1656 location and try to set gl_object again. We clear gl_object here so
1657 that subsequent inode creates don't see an old gl_object. */
1658 glock_clear_object(ip->i_gl, ip);
1659 error = gfs2_dinode_dealloc(ip);
1660 goto out_unlock;
1661
1662 out_truncate:
1663 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1664 GFS2_LFC_EVICT_INODE);
1665 metamapping = gfs2_glock2aspace(ip->i_gl);
1666 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1667 filemap_fdatawrite(metamapping);
1668 filemap_fdatawait(metamapping);
1669 }
1670 write_inode_now(inode, 1);
1671 gfs2_ail_flush(ip->i_gl, 0);
1672
1673 /* Case 2 starts here */
1674 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1675 if (error)
1676 goto out_unlock;
1677 /* Needs to be done before glock release & also in a transaction */
1678 truncate_inode_pages(&inode->i_data, 0);
1679 truncate_inode_pages(metamapping, 0);
1680 gfs2_trans_end(sdp);
1681
1682 out_unlock:
1683 /* Error path for case 1 */
1684 if (gfs2_rs_active(&ip->i_res))
1685 gfs2_rs_deltree(&ip->i_res);
1686
1687 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1688 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1689 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1690 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1691 gfs2_glock_dq(&ip->i_iopen_gh);
1692 }
1693 gfs2_holder_uninit(&ip->i_iopen_gh);
1694 }
1695 if (gfs2_holder_initialized(&gh)) {
1696 glock_clear_object(ip->i_gl, ip);
1697 gfs2_glock_dq_uninit(&gh);
1698 }
1699 if (error && error != GLR_TRYFAILED && error != -EROFS)
1700 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1701 out:
1702 /* Case 3 starts here */
1703 truncate_inode_pages_final(&inode->i_data);
1704 gfs2_rsqa_delete(ip, NULL);
1705 gfs2_ordered_del_inode(ip);
1706 clear_inode(inode);
1707 gfs2_dir_hash_inval(ip);
1708 glock_clear_object(ip->i_gl, ip);
1709 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1710 gfs2_glock_add_to_lru(ip->i_gl);
1711 gfs2_glock_put_eventually(ip->i_gl);
1712 ip->i_gl = NULL;
1713 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1714 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1715
1716 glock_clear_object(gl, ip);
1717 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1718 gfs2_glock_hold(gl);
1719 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1720 gfs2_glock_put_eventually(gl);
1721 }
1722 }
1723
1724 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1725 {
1726 struct gfs2_inode *ip;
1727
1728 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1729 if (ip) {
1730 ip->i_flags = 0;
1731 ip->i_gl = NULL;
1732 memset(&ip->i_res, 0, sizeof(ip->i_res));
1733 RB_CLEAR_NODE(&ip->i_res.rs_node);
1734 ip->i_rahead = 0;
1735 }
1736 return &ip->i_inode;
1737 }
1738
1739 static void gfs2_i_callback(struct rcu_head *head)
1740 {
1741 struct inode *inode = container_of(head, struct inode, i_rcu);
1742 kmem_cache_free(gfs2_inode_cachep, inode);
1743 }
1744
1745 static void gfs2_destroy_inode(struct inode *inode)
1746 {
1747 call_rcu(&inode->i_rcu, gfs2_i_callback);
1748 }
1749
1750 const struct super_operations gfs2_super_ops = {
1751 .alloc_inode = gfs2_alloc_inode,
1752 .destroy_inode = gfs2_destroy_inode,
1753 .write_inode = gfs2_write_inode,
1754 .dirty_inode = gfs2_dirty_inode,
1755 .evict_inode = gfs2_evict_inode,
1756 .put_super = gfs2_put_super,
1757 .sync_fs = gfs2_sync_fs,
1758 .freeze_super = gfs2_freeze,
1759 .thaw_super = gfs2_unfreeze,
1760 .statfs = gfs2_statfs,
1761 .remount_fs = gfs2_remount_fs,
1762 .drop_inode = gfs2_drop_inode,
1763 .show_options = gfs2_show_options,
1764 };
1765
Linux with added FPC-III support