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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#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
50enum {
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
88static 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
135int 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
296void 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
316static 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
334struct 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
345int 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
364static 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
386fail:
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
398int 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 t_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_trans_gl, LM_ST_SHARED, 0, &t_gh);
411 if (error)
412 goto fail_threads;
413
414 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
415
416 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
417 if (error)
418 goto fail;
419
420 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
421 gfs2_consist(sdp);
422 error = -EIO;
423 goto fail;
424 }
425
426 /* Initialize some head of the log stuff */
427 sdp->sd_log_sequence = head.lh_sequence + 1;
428 gfs2_log_pointers_init(sdp, head.lh_blkno);
429
430 error = gfs2_quota_init(sdp);
431 if (error)
432 goto fail;
433
434 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
435
436 gfs2_glock_dq_uninit(&t_gh);
437
438 return 0;
439
440fail:
441 t_gh.gh_flags |= GL_NOCACHE;
442 gfs2_glock_dq_uninit(&t_gh);
443fail_threads:
444 kthread_stop(sdp->sd_quotad_process);
445 kthread_stop(sdp->sd_logd_process);
446 return error;
447}
448
449void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
450{
451 const struct gfs2_statfs_change *str = buf;
452
453 sc->sc_total = be64_to_cpu(str->sc_total);
454 sc->sc_free = be64_to_cpu(str->sc_free);
455 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
456}
457
458static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
459{
460 struct gfs2_statfs_change *str = buf;
461
462 str->sc_total = cpu_to_be64(sc->sc_total);
463 str->sc_free = cpu_to_be64(sc->sc_free);
464 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
465}
466
467int gfs2_statfs_init(struct gfs2_sbd *sdp)
468{
469 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
470 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
471 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
472 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
473 struct buffer_head *m_bh, *l_bh;
474 struct gfs2_holder gh;
475 int error;
476
477 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
478 &gh);
479 if (error)
480 return error;
481
482 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
483 if (error)
484 goto out;
485
486 if (sdp->sd_args.ar_spectator) {
487 spin_lock(&sdp->sd_statfs_spin);
488 gfs2_statfs_change_in(m_sc, m_bh->b_data +
489 sizeof(struct gfs2_dinode));
490 spin_unlock(&sdp->sd_statfs_spin);
491 } else {
492 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
493 if (error)
494 goto out_m_bh;
495
496 spin_lock(&sdp->sd_statfs_spin);
497 gfs2_statfs_change_in(m_sc, m_bh->b_data +
498 sizeof(struct gfs2_dinode));
499 gfs2_statfs_change_in(l_sc, l_bh->b_data +
500 sizeof(struct gfs2_dinode));
501 spin_unlock(&sdp->sd_statfs_spin);
502
503 brelse(l_bh);
504 }
505
506out_m_bh:
507 brelse(m_bh);
508out:
509 gfs2_glock_dq_uninit(&gh);
510 return 0;
511}
512
513void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
514 s64 dinodes)
515{
516 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
517 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
518 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
519 struct buffer_head *l_bh;
520 s64 x, y;
521 int need_sync = 0;
522 int error;
523
524 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
525 if (error)
526 return;
527
528 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
529
530 spin_lock(&sdp->sd_statfs_spin);
531 l_sc->sc_total += total;
532 l_sc->sc_free += free;
533 l_sc->sc_dinodes += dinodes;
534 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
535 if (sdp->sd_args.ar_statfs_percent) {
536 x = 100 * l_sc->sc_free;
537 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
538 if (x >= y || x <= -y)
539 need_sync = 1;
540 }
541 spin_unlock(&sdp->sd_statfs_spin);
542
543 brelse(l_bh);
544 if (need_sync)
545 gfs2_wake_up_statfs(sdp);
546}
547
548void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
549 struct buffer_head *l_bh)
550{
551 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
552 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
553 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
554 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
555
556 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
557
558 spin_lock(&sdp->sd_statfs_spin);
559 m_sc->sc_total += l_sc->sc_total;
560 m_sc->sc_free += l_sc->sc_free;
561 m_sc->sc_dinodes += l_sc->sc_dinodes;
562 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
563 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
564 0, sizeof(struct gfs2_statfs_change));
565 spin_unlock(&sdp->sd_statfs_spin);
566
567 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
568 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
569}
570
571int gfs2_statfs_sync(struct super_block *sb, int type)
572{
573 struct gfs2_sbd *sdp = sb->s_fs_info;
574 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
575 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
576 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
577 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
578 struct gfs2_holder gh;
579 struct buffer_head *m_bh, *l_bh;
580 int error;
581
582 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
583 &gh);
584 if (error)
585 return error;
586
587 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
588 if (error)
589 goto out;
590
591 spin_lock(&sdp->sd_statfs_spin);
592 gfs2_statfs_change_in(m_sc, m_bh->b_data +
593 sizeof(struct gfs2_dinode));
594 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
595 spin_unlock(&sdp->sd_statfs_spin);
596 goto out_bh;
597 }
598 spin_unlock(&sdp->sd_statfs_spin);
599
600 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
601 if (error)
602 goto out_bh;
603
604 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
605 if (error)
606 goto out_bh2;
607
608 update_statfs(sdp, m_bh, l_bh);
609 sdp->sd_statfs_force_sync = 0;
610
611 gfs2_trans_end(sdp);
612
613out_bh2:
614 brelse(l_bh);
615out_bh:
616 brelse(m_bh);
617out:
618 gfs2_glock_dq_uninit(&gh);
619 return error;
620}
621
622struct lfcc {
623 struct list_head list;
624 struct gfs2_holder gh;
625};
626
627/**
628 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
629 * journals are clean
630 * @sdp: the file system
631 * @state: the state to put the transaction lock into
632 * @t_gh: the hold on the transaction lock
633 *
634 * Returns: errno
635 */
636
637static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
638 struct gfs2_holder *t_gh)
639{
640 struct gfs2_inode *ip;
641 struct gfs2_jdesc *jd;
642 struct lfcc *lfcc;
643 LIST_HEAD(list);
644 struct gfs2_log_header_host lh;
645 int error;
646
647 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
648 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
649 if (!lfcc) {
650 error = -ENOMEM;
651 goto out;
652 }
653 ip = GFS2_I(jd->jd_inode);
654 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
655 if (error) {
656 kfree(lfcc);
657 goto out;
658 }
659 list_add(&lfcc->list, &list);
660 }
661
662 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
663 GL_NOCACHE, t_gh);
664
665 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
666 error = gfs2_jdesc_check(jd);
667 if (error)
668 break;
669 error = gfs2_find_jhead(jd, &lh);
670 if (error)
671 break;
672 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
673 error = -EBUSY;
674 break;
675 }
676 }
677
678 if (error)
679 gfs2_glock_dq_uninit(t_gh);
680
681out:
682 while (!list_empty(&list)) {
683 lfcc = list_entry(list.next, struct lfcc, list);
684 list_del(&lfcc->list);
685 gfs2_glock_dq_uninit(&lfcc->gh);
686 kfree(lfcc);
687 }
688 return error;
689}
690
691void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
692{
693 struct gfs2_dinode *str = buf;
694
695 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
696 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
697 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
698 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
699 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
700 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
701 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
702 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
703 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
704 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
705 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
706 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
707 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
708 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
709
710 str->di_goal_meta = cpu_to_be64(ip->i_goal);
711 str->di_goal_data = cpu_to_be64(ip->i_goal);
712 str->di_generation = cpu_to_be64(ip->i_generation);
713
714 str->di_flags = cpu_to_be32(ip->i_diskflags);
715 str->di_height = cpu_to_be16(ip->i_height);
716 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
717 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
718 GFS2_FORMAT_DE : 0);
719 str->di_depth = cpu_to_be16(ip->i_depth);
720 str->di_entries = cpu_to_be32(ip->i_entries);
721
722 str->di_eattr = cpu_to_be64(ip->i_eattr);
723 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
724 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
725 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
726}
727
728/**
729 * gfs2_write_inode - Make sure the inode is stable on the disk
730 * @inode: The inode
731 * @wbc: The writeback control structure
732 *
733 * Returns: errno
734 */
735
736static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
737{
738 struct gfs2_inode *ip = GFS2_I(inode);
739 struct gfs2_sbd *sdp = GFS2_SB(inode);
740 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
741 struct backing_dev_info *bdi = metamapping->backing_dev_info;
742 int ret = 0;
743
744 if (wbc->sync_mode == WB_SYNC_ALL)
745 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
746 if (bdi->dirty_exceeded)
747 gfs2_ail1_flush(sdp, wbc);
748 else
749 filemap_fdatawrite(metamapping);
750 if (wbc->sync_mode == WB_SYNC_ALL)
751 ret = filemap_fdatawait(metamapping);
752 if (ret)
753 mark_inode_dirty_sync(inode);
754 return ret;
755}
756
757/**
758 * gfs2_dirty_inode - check for atime updates
759 * @inode: The inode in question
760 * @flags: The type of dirty
761 *
762 * Unfortunately it can be called under any combination of inode
763 * glock and transaction lock, so we have to check carefully.
764 *
765 * At the moment this deals only with atime - it should be possible
766 * to expand that role in future, once a review of the locking has
767 * been carried out.
768 */
769
770static void gfs2_dirty_inode(struct inode *inode, int flags)
771{
772 struct gfs2_inode *ip = GFS2_I(inode);
773 struct gfs2_sbd *sdp = GFS2_SB(inode);
774 struct buffer_head *bh;
775 struct gfs2_holder gh;
776 int need_unlock = 0;
777 int need_endtrans = 0;
778 int ret;
779
780 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
781 return;
782
783 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
784 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
785 if (ret) {
786 fs_err(sdp, "dirty_inode: glock %d\n", ret);
787 return;
788 }
789 need_unlock = 1;
790 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
791 return;
792
793 if (current->journal_info == NULL) {
794 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
795 if (ret) {
796 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
797 goto out;
798 }
799 need_endtrans = 1;
800 }
801
802 ret = gfs2_meta_inode_buffer(ip, &bh);
803 if (ret == 0) {
804 gfs2_trans_add_meta(ip->i_gl, bh);
805 gfs2_dinode_out(ip, bh->b_data);
806 brelse(bh);
807 }
808
809 if (need_endtrans)
810 gfs2_trans_end(sdp);
811out:
812 if (need_unlock)
813 gfs2_glock_dq_uninit(&gh);
814}
815
816/**
817 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
818 * @sdp: the filesystem
819 *
820 * Returns: errno
821 */
822
823static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
824{
825 struct gfs2_holder t_gh;
826 int error;
827
828 kthread_stop(sdp->sd_quotad_process);
829 kthread_stop(sdp->sd_logd_process);
830
831 flush_workqueue(gfs2_delete_workqueue);
832 gfs2_quota_sync(sdp->sd_vfs, 0);
833 gfs2_statfs_sync(sdp->sd_vfs, 0);
834
835 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
836 &t_gh);
837 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
838 return error;
839
840 gfs2_meta_syncfs(sdp);
841 gfs2_log_shutdown(sdp);
842
843 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
844
845 if (t_gh.gh_gl)
846 gfs2_glock_dq_uninit(&t_gh);
847
848 gfs2_quota_cleanup(sdp);
849
850 return error;
851}
852
853static int gfs2_umount_recovery_wait(void *word)
854{
855 schedule();
856 return 0;
857}
858
859/**
860 * gfs2_put_super - Unmount the filesystem
861 * @sb: The VFS superblock
862 *
863 */
864
865static void gfs2_put_super(struct super_block *sb)
866{
867 struct gfs2_sbd *sdp = sb->s_fs_info;
868 int error;
869 struct gfs2_jdesc *jd;
870
871 /* No more recovery requests */
872 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
873 smp_mb();
874
875 /* Wait on outstanding recovery */
876restart:
877 spin_lock(&sdp->sd_jindex_spin);
878 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
879 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
880 continue;
881 spin_unlock(&sdp->sd_jindex_spin);
882 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
883 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
884 goto restart;
885 }
886 spin_unlock(&sdp->sd_jindex_spin);
887
888 if (!(sb->s_flags & MS_RDONLY)) {
889 error = gfs2_make_fs_ro(sdp);
890 if (error)
891 gfs2_io_error(sdp);
892 }
893 /* At this point, we're through modifying the disk */
894
895 /* Release stuff */
896
897 iput(sdp->sd_jindex);
898 iput(sdp->sd_statfs_inode);
899 iput(sdp->sd_rindex);
900 iput(sdp->sd_quota_inode);
901
902 gfs2_glock_put(sdp->sd_rename_gl);
903 gfs2_glock_put(sdp->sd_trans_gl);
904
905 if (!sdp->sd_args.ar_spectator) {
906 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
907 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
908 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
909 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
910 iput(sdp->sd_sc_inode);
911 iput(sdp->sd_qc_inode);
912 }
913
914 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
915 gfs2_clear_rgrpd(sdp);
916 gfs2_jindex_free(sdp);
917 /* Take apart glock structures and buffer lists */
918 gfs2_gl_hash_clear(sdp);
919 /* Unmount the locking protocol */
920 gfs2_lm_unmount(sdp);
921
922 /* At this point, we're through participating in the lockspace */
923 gfs2_sys_fs_del(sdp);
924}
925
926/**
927 * gfs2_sync_fs - sync the filesystem
928 * @sb: the superblock
929 *
930 * Flushes the log to disk.
931 */
932
933static int gfs2_sync_fs(struct super_block *sb, int wait)
934{
935 struct gfs2_sbd *sdp = sb->s_fs_info;
936
937 gfs2_quota_sync(sb, -1);
938 if (wait && sdp)
939 gfs2_log_flush(sdp, NULL);
940 return 0;
941}
942
943/**
944 * gfs2_freeze - prevent further writes to the filesystem
945 * @sb: the VFS structure for the filesystem
946 *
947 */
948
949static int gfs2_freeze(struct super_block *sb)
950{
951 struct gfs2_sbd *sdp = sb->s_fs_info;
952 int error;
953
954 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
955 return -EINVAL;
956
957 for (;;) {
958 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
959 if (!error)
960 break;
961
962 switch (error) {
963 case -EBUSY:
964 fs_err(sdp, "waiting for recovery before freeze\n");
965 break;
966
967 default:
968 fs_err(sdp, "error freezing FS: %d\n", error);
969 break;
970 }
971
972 fs_err(sdp, "retrying...\n");
973 msleep(1000);
974 }
975 return 0;
976}
977
978/**
979 * gfs2_unfreeze - reallow writes to the filesystem
980 * @sb: the VFS structure for the filesystem
981 *
982 */
983
984static int gfs2_unfreeze(struct super_block *sb)
985{
986 struct gfs2_sbd *sdp = sb->s_fs_info;
987
988 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
989 return 0;
990}
991
992/**
993 * statfs_fill - fill in the sg for a given RG
994 * @rgd: the RG
995 * @sc: the sc structure
996 *
997 * Returns: 0 on success, -ESTALE if the LVB is invalid
998 */
999
1000static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1001 struct gfs2_statfs_change_host *sc)
1002{
1003 gfs2_rgrp_verify(rgd);
1004 sc->sc_total += rgd->rd_data;
1005 sc->sc_free += rgd->rd_free;
1006 sc->sc_dinodes += rgd->rd_dinodes;
1007 return 0;
1008}
1009
1010/**
1011 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1012 * @sdp: the filesystem
1013 * @sc: the sc info that will be returned
1014 *
1015 * Any error (other than a signal) will cause this routine to fall back
1016 * to the synchronous version.
1017 *
1018 * FIXME: This really shouldn't busy wait like this.
1019 *
1020 * Returns: errno
1021 */
1022
1023static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1024{
1025 struct gfs2_rgrpd *rgd_next;
1026 struct gfs2_holder *gha, *gh;
1027 unsigned int slots = 64;
1028 unsigned int x;
1029 int done;
1030 int error = 0, err;
1031
1032 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1033 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1034 if (!gha)
1035 return -ENOMEM;
1036
1037 rgd_next = gfs2_rgrpd_get_first(sdp);
1038
1039 for (;;) {
1040 done = 1;
1041
1042 for (x = 0; x < slots; x++) {
1043 gh = gha + x;
1044
1045 if (gh->gh_gl && gfs2_glock_poll(gh)) {
1046 err = gfs2_glock_wait(gh);
1047 if (err) {
1048 gfs2_holder_uninit(gh);
1049 error = err;
1050 } else {
1051 if (!error)
1052 error = statfs_slow_fill(
1053 gh->gh_gl->gl_object, sc);
1054 gfs2_glock_dq_uninit(gh);
1055 }
1056 }
1057
1058 if (gh->gh_gl)
1059 done = 0;
1060 else if (rgd_next && !error) {
1061 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1062 LM_ST_SHARED,
1063 GL_ASYNC,
1064 gh);
1065 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1066 done = 0;
1067 }
1068
1069 if (signal_pending(current))
1070 error = -ERESTARTSYS;
1071 }
1072
1073 if (done)
1074 break;
1075
1076 yield();
1077 }
1078
1079 kfree(gha);
1080 return error;
1081}
1082
1083/**
1084 * gfs2_statfs_i - Do a statfs
1085 * @sdp: the filesystem
1086 * @sg: the sg structure
1087 *
1088 * Returns: errno
1089 */
1090
1091static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1092{
1093 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1094 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1095
1096 spin_lock(&sdp->sd_statfs_spin);
1097
1098 *sc = *m_sc;
1099 sc->sc_total += l_sc->sc_total;
1100 sc->sc_free += l_sc->sc_free;
1101 sc->sc_dinodes += l_sc->sc_dinodes;
1102
1103 spin_unlock(&sdp->sd_statfs_spin);
1104
1105 if (sc->sc_free < 0)
1106 sc->sc_free = 0;
1107 if (sc->sc_free > sc->sc_total)
1108 sc->sc_free = sc->sc_total;
1109 if (sc->sc_dinodes < 0)
1110 sc->sc_dinodes = 0;
1111
1112 return 0;
1113}
1114
1115/**
1116 * gfs2_statfs - Gather and return stats about the filesystem
1117 * @sb: The superblock
1118 * @statfsbuf: The buffer
1119 *
1120 * Returns: 0 on success or error code
1121 */
1122
1123static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1124{
1125 struct super_block *sb = dentry->d_inode->i_sb;
1126 struct gfs2_sbd *sdp = sb->s_fs_info;
1127 struct gfs2_statfs_change_host sc;
1128 int error;
1129
1130 error = gfs2_rindex_update(sdp);
1131 if (error)
1132 return error;
1133
1134 if (gfs2_tune_get(sdp, gt_statfs_slow))
1135 error = gfs2_statfs_slow(sdp, &sc);
1136 else
1137 error = gfs2_statfs_i(sdp, &sc);
1138
1139 if (error)
1140 return error;
1141
1142 buf->f_type = GFS2_MAGIC;
1143 buf->f_bsize = sdp->sd_sb.sb_bsize;
1144 buf->f_blocks = sc.sc_total;
1145 buf->f_bfree = sc.sc_free;
1146 buf->f_bavail = sc.sc_free;
1147 buf->f_files = sc.sc_dinodes + sc.sc_free;
1148 buf->f_ffree = sc.sc_free;
1149 buf->f_namelen = GFS2_FNAMESIZE;
1150
1151 return 0;
1152}
1153
1154/**
1155 * gfs2_remount_fs - called when the FS is remounted
1156 * @sb: the filesystem
1157 * @flags: the remount flags
1158 * @data: extra data passed in (not used right now)
1159 *
1160 * Returns: errno
1161 */
1162
1163static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1164{
1165 struct gfs2_sbd *sdp = sb->s_fs_info;
1166 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1167 struct gfs2_tune *gt = &sdp->sd_tune;
1168 int error;
1169
1170 sync_filesystem(sb);
1171
1172 spin_lock(>->gt_spin);
1173 args.ar_commit = gt->gt_logd_secs;
1174 args.ar_quota_quantum = gt->gt_quota_quantum;
1175 if (gt->gt_statfs_slow)
1176 args.ar_statfs_quantum = 0;
1177 else
1178 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1179 spin_unlock(>->gt_spin);
1180 error = gfs2_mount_args(&args, data);
1181 if (error)
1182 return error;
1183
1184 /* Not allowed to change locking details */
1185 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1186 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1187 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1188 return -EINVAL;
1189
1190 /* Some flags must not be changed */
1191 if (args_neq(&args, &sdp->sd_args, spectator) ||
1192 args_neq(&args, &sdp->sd_args, localflocks) ||
1193 args_neq(&args, &sdp->sd_args, meta))
1194 return -EINVAL;
1195
1196 if (sdp->sd_args.ar_spectator)
1197 *flags |= MS_RDONLY;
1198
1199 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1200 if (*flags & MS_RDONLY)
1201 error = gfs2_make_fs_ro(sdp);
1202 else
1203 error = gfs2_make_fs_rw(sdp);
1204 if (error)
1205 return error;
1206 }
1207
1208 sdp->sd_args = args;
1209 if (sdp->sd_args.ar_posix_acl)
1210 sb->s_flags |= MS_POSIXACL;
1211 else
1212 sb->s_flags &= ~MS_POSIXACL;
1213 if (sdp->sd_args.ar_nobarrier)
1214 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1215 else
1216 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1217 spin_lock(>->gt_spin);
1218 gt->gt_logd_secs = args.ar_commit;
1219 gt->gt_quota_quantum = args.ar_quota_quantum;
1220 if (args.ar_statfs_quantum) {
1221 gt->gt_statfs_slow = 0;
1222 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1223 }
1224 else {
1225 gt->gt_statfs_slow = 1;
1226 gt->gt_statfs_quantum = 30;
1227 }
1228 spin_unlock(>->gt_spin);
1229
1230 gfs2_online_uevent(sdp);
1231 return 0;
1232}
1233
1234/**
1235 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1236 * @inode: The inode to drop
1237 *
1238 * If we've received a callback on an iopen lock then its because a
1239 * remote node tried to deallocate the inode but failed due to this node
1240 * still having the inode open. Here we mark the link count zero
1241 * since we know that it must have reached zero if the GLF_DEMOTE flag
1242 * is set on the iopen glock. If we didn't do a disk read since the
1243 * remote node removed the final link then we might otherwise miss
1244 * this event. This check ensures that this node will deallocate the
1245 * inode's blocks, or alternatively pass the baton on to another
1246 * node for later deallocation.
1247 */
1248
1249static int gfs2_drop_inode(struct inode *inode)
1250{
1251 struct gfs2_inode *ip = GFS2_I(inode);
1252
1253 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
1254 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1255 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1256 clear_nlink(inode);
1257 }
1258 return generic_drop_inode(inode);
1259}
1260
1261static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1262{
1263 do {
1264 if (d1 == d2)
1265 return 1;
1266 d1 = d1->d_parent;
1267 } while (!IS_ROOT(d1));
1268 return 0;
1269}
1270
1271/**
1272 * gfs2_show_options - Show mount options for /proc/mounts
1273 * @s: seq_file structure
1274 * @root: root of this (sub)tree
1275 *
1276 * Returns: 0 on success or error code
1277 */
1278
1279static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1280{
1281 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1282 struct gfs2_args *args = &sdp->sd_args;
1283 int val;
1284
1285 if (is_ancestor(root, sdp->sd_master_dir))
1286 seq_printf(s, ",meta");
1287 if (args->ar_lockproto[0])
1288 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1289 if (args->ar_locktable[0])
1290 seq_printf(s, ",locktable=%s", args->ar_locktable);
1291 if (args->ar_hostdata[0])
1292 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1293 if (args->ar_spectator)
1294 seq_printf(s, ",spectator");
1295 if (args->ar_localflocks)
1296 seq_printf(s, ",localflocks");
1297 if (args->ar_debug)
1298 seq_printf(s, ",debug");
1299 if (args->ar_posix_acl)
1300 seq_printf(s, ",acl");
1301 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1302 char *state;
1303 switch (args->ar_quota) {
1304 case GFS2_QUOTA_OFF:
1305 state = "off";
1306 break;
1307 case GFS2_QUOTA_ACCOUNT:
1308 state = "account";
1309 break;
1310 case GFS2_QUOTA_ON:
1311 state = "on";
1312 break;
1313 default:
1314 state = "unknown";
1315 break;
1316 }
1317 seq_printf(s, ",quota=%s", state);
1318 }
1319 if (args->ar_suiddir)
1320 seq_printf(s, ",suiddir");
1321 if (args->ar_data != GFS2_DATA_DEFAULT) {
1322 char *state;
1323 switch (args->ar_data) {
1324 case GFS2_DATA_WRITEBACK:
1325 state = "writeback";
1326 break;
1327 case GFS2_DATA_ORDERED:
1328 state = "ordered";
1329 break;
1330 default:
1331 state = "unknown";
1332 break;
1333 }
1334 seq_printf(s, ",data=%s", state);
1335 }
1336 if (args->ar_discard)
1337 seq_printf(s, ",discard");
1338 val = sdp->sd_tune.gt_logd_secs;
1339 if (val != 30)
1340 seq_printf(s, ",commit=%d", val);
1341 val = sdp->sd_tune.gt_statfs_quantum;
1342 if (val != 30)
1343 seq_printf(s, ",statfs_quantum=%d", val);
1344 else if (sdp->sd_tune.gt_statfs_slow)
1345 seq_puts(s, ",statfs_quantum=0");
1346 val = sdp->sd_tune.gt_quota_quantum;
1347 if (val != 60)
1348 seq_printf(s, ",quota_quantum=%d", val);
1349 if (args->ar_statfs_percent)
1350 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1351 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1352 const char *state;
1353
1354 switch (args->ar_errors) {
1355 case GFS2_ERRORS_WITHDRAW:
1356 state = "withdraw";
1357 break;
1358 case GFS2_ERRORS_PANIC:
1359 state = "panic";
1360 break;
1361 default:
1362 state = "unknown";
1363 break;
1364 }
1365 seq_printf(s, ",errors=%s", state);
1366 }
1367 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1368 seq_printf(s, ",nobarrier");
1369 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1370 seq_printf(s, ",demote_interface_used");
1371 if (args->ar_rgrplvb)
1372 seq_printf(s, ",rgrplvb");
1373 return 0;
1374}
1375
1376static void gfs2_final_release_pages(struct gfs2_inode *ip)
1377{
1378 struct inode *inode = &ip->i_inode;
1379 struct gfs2_glock *gl = ip->i_gl;
1380
1381 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1382 truncate_inode_pages(&inode->i_data, 0);
1383
1384 if (atomic_read(&gl->gl_revokes) == 0) {
1385 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1386 clear_bit(GLF_DIRTY, &gl->gl_flags);
1387 }
1388}
1389
1390static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1391{
1392 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1393 struct gfs2_rgrpd *rgd;
1394 struct gfs2_holder gh;
1395 int error;
1396
1397 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1398 gfs2_consist_inode(ip);
1399 return -EIO;
1400 }
1401
1402 error = gfs2_rindex_update(sdp);
1403 if (error)
1404 return error;
1405
1406 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1407 if (error)
1408 return error;
1409
1410 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1411 if (!rgd) {
1412 gfs2_consist_inode(ip);
1413 error = -EIO;
1414 goto out_qs;
1415 }
1416
1417 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1418 if (error)
1419 goto out_qs;
1420
1421 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1422 sdp->sd_jdesc->jd_blocks);
1423 if (error)
1424 goto out_rg_gunlock;
1425
1426 gfs2_free_di(rgd, ip);
1427
1428 gfs2_final_release_pages(ip);
1429
1430 gfs2_trans_end(sdp);
1431
1432out_rg_gunlock:
1433 gfs2_glock_dq_uninit(&gh);
1434out_qs:
1435 gfs2_quota_unhold(ip);
1436 return error;
1437}
1438
1439/**
1440 * gfs2_evict_inode - Remove an inode from cache
1441 * @inode: The inode to evict
1442 *
1443 * There are three cases to consider:
1444 * 1. i_nlink == 0, we are final opener (and must deallocate)
1445 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1446 * 3. i_nlink > 0
1447 *
1448 * If the fs is read only, then we have to treat all cases as per #3
1449 * since we are unable to do any deallocation. The inode will be
1450 * deallocated by the next read/write node to attempt an allocation
1451 * in the same resource group
1452 *
1453 * We have to (at the moment) hold the inodes main lock to cover
1454 * the gap between unlocking the shared lock on the iopen lock and
1455 * taking the exclusive lock. I'd rather do a shared -> exclusive
1456 * conversion on the iopen lock, but we can change that later. This
1457 * is safe, just less efficient.
1458 */
1459
1460static void gfs2_evict_inode(struct inode *inode)
1461{
1462 struct super_block *sb = inode->i_sb;
1463 struct gfs2_sbd *sdp = sb->s_fs_info;
1464 struct gfs2_inode *ip = GFS2_I(inode);
1465 struct gfs2_holder gh;
1466 int error;
1467
1468 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1469 clear_inode(inode);
1470 return;
1471 }
1472
1473 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1474 goto out;
1475
1476 /* Must not read inode block until block type has been verified */
1477 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1478 if (unlikely(error)) {
1479 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1480 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1481 goto out;
1482 }
1483
1484 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1485 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1486 if (error)
1487 goto out_truncate;
1488 }
1489
1490 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1491 error = gfs2_inode_refresh(ip);
1492 if (error)
1493 goto out_truncate;
1494 }
1495
1496 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1497 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1498 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1499 error = gfs2_glock_nq(&ip->i_iopen_gh);
1500 if (error)
1501 goto out_truncate;
1502
1503 /* Case 1 starts here */
1504
1505 if (S_ISDIR(inode->i_mode) &&
1506 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1507 error = gfs2_dir_exhash_dealloc(ip);
1508 if (error)
1509 goto out_unlock;
1510 }
1511
1512 if (ip->i_eattr) {
1513 error = gfs2_ea_dealloc(ip);
1514 if (error)
1515 goto out_unlock;
1516 }
1517
1518 if (!gfs2_is_stuffed(ip)) {
1519 error = gfs2_file_dealloc(ip);
1520 if (error)
1521 goto out_unlock;
1522 }
1523
1524 error = gfs2_dinode_dealloc(ip);
1525 goto out_unlock;
1526
1527out_truncate:
1528 gfs2_log_flush(sdp, ip->i_gl);
1529 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1530 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1531 filemap_fdatawrite(metamapping);
1532 filemap_fdatawait(metamapping);
1533 }
1534 write_inode_now(inode, 1);
1535 gfs2_ail_flush(ip->i_gl, 0);
1536
1537 /* Case 2 starts here */
1538 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1539 if (error)
1540 goto out_unlock;
1541 /* Needs to be done before glock release & also in a transaction */
1542 truncate_inode_pages(&inode->i_data, 0);
1543 gfs2_trans_end(sdp);
1544
1545out_unlock:
1546 /* Error path for case 1 */
1547 if (gfs2_rs_active(ip->i_res))
1548 gfs2_rs_deltree(ip->i_res);
1549
1550 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1551 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1552 gfs2_glock_dq(&ip->i_iopen_gh);
1553 }
1554 gfs2_holder_uninit(&ip->i_iopen_gh);
1555 gfs2_glock_dq_uninit(&gh);
1556 if (error && error != GLR_TRYFAILED && error != -EROFS)
1557 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1558out:
1559 /* Case 3 starts here */
1560 truncate_inode_pages_final(&inode->i_data);
1561 gfs2_rs_delete(ip, NULL);
1562 gfs2_ordered_del_inode(ip);
1563 clear_inode(inode);
1564 gfs2_dir_hash_inval(ip);
1565 ip->i_gl->gl_object = NULL;
1566 flush_delayed_work(&ip->i_gl->gl_work);
1567 gfs2_glock_add_to_lru(ip->i_gl);
1568 gfs2_glock_put(ip->i_gl);
1569 ip->i_gl = NULL;
1570 if (ip->i_iopen_gh.gh_gl) {
1571 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1572 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1573 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1574 }
1575}
1576
1577static struct inode *gfs2_alloc_inode(struct super_block *sb)
1578{
1579 struct gfs2_inode *ip;
1580
1581 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1582 if (ip) {
1583 ip->i_flags = 0;
1584 ip->i_gl = NULL;
1585 ip->i_rgd = NULL;
1586 ip->i_res = NULL;
1587 }
1588 return &ip->i_inode;
1589}
1590
1591static void gfs2_i_callback(struct rcu_head *head)
1592{
1593 struct inode *inode = container_of(head, struct inode, i_rcu);
1594 kmem_cache_free(gfs2_inode_cachep, inode);
1595}
1596
1597static void gfs2_destroy_inode(struct inode *inode)
1598{
1599 call_rcu(&inode->i_rcu, gfs2_i_callback);
1600}
1601
1602const struct super_operations gfs2_super_ops = {
1603 .alloc_inode = gfs2_alloc_inode,
1604 .destroy_inode = gfs2_destroy_inode,
1605 .write_inode = gfs2_write_inode,
1606 .dirty_inode = gfs2_dirty_inode,
1607 .evict_inode = gfs2_evict_inode,
1608 .put_super = gfs2_put_super,
1609 .sync_fs = gfs2_sync_fs,
1610 .freeze_fs = gfs2_freeze,
1611 .unfreeze_fs = gfs2_unfreeze,
1612 .statfs = gfs2_statfs,
1613 .remount_fs = gfs2_remount_fs,
1614 .drop_inode = gfs2_drop_inode,
1615 .show_options = gfs2_show_options,
1616};
1617
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/bio.h>
10#include <linux/sched/signal.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/statfs.h>
16#include <linux/seq_file.h>
17#include <linux/mount.h>
18#include <linux/kthread.h>
19#include <linux/delay.h>
20#include <linux/gfs2_ondisk.h>
21#include <linux/crc32.h>
22#include <linux/time.h>
23#include <linux/wait.h>
24#include <linux/writeback.h>
25#include <linux/backing-dev.h>
26#include <linux/kernel.h>
27
28#include "gfs2.h"
29#include "incore.h"
30#include "bmap.h"
31#include "dir.h"
32#include "glock.h"
33#include "glops.h"
34#include "inode.h"
35#include "log.h"
36#include "meta_io.h"
37#include "quota.h"
38#include "recovery.h"
39#include "rgrp.h"
40#include "super.h"
41#include "trans.h"
42#include "util.h"
43#include "sys.h"
44#include "xattr.h"
45#include "lops.h"
46
47/**
48 * gfs2_jindex_free - Clear all the journal index information
49 * @sdp: The GFS2 superblock
50 *
51 */
52
53void gfs2_jindex_free(struct gfs2_sbd *sdp)
54{
55 struct list_head list;
56 struct gfs2_jdesc *jd;
57
58 spin_lock(&sdp->sd_jindex_spin);
59 list_add(&list, &sdp->sd_jindex_list);
60 list_del_init(&sdp->sd_jindex_list);
61 sdp->sd_journals = 0;
62 spin_unlock(&sdp->sd_jindex_spin);
63
64 sdp->sd_jdesc = NULL;
65 while (!list_empty(&list)) {
66 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
67 gfs2_free_journal_extents(jd);
68 list_del(&jd->jd_list);
69 iput(jd->jd_inode);
70 jd->jd_inode = NULL;
71 kfree(jd);
72 }
73}
74
75static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
76{
77 struct gfs2_jdesc *jd;
78 int found = 0;
79
80 list_for_each_entry(jd, head, jd_list) {
81 if (jd->jd_jid == jid) {
82 found = 1;
83 break;
84 }
85 }
86
87 if (!found)
88 jd = NULL;
89
90 return jd;
91}
92
93struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
94{
95 struct gfs2_jdesc *jd;
96
97 spin_lock(&sdp->sd_jindex_spin);
98 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
99 spin_unlock(&sdp->sd_jindex_spin);
100
101 return jd;
102}
103
104int gfs2_jdesc_check(struct gfs2_jdesc *jd)
105{
106 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
107 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
108 u64 size = i_size_read(jd->jd_inode);
109
110 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
111 return -EIO;
112
113 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
114
115 if (gfs2_write_alloc_required(ip, 0, size)) {
116 gfs2_consist_inode(ip);
117 return -EIO;
118 }
119
120 return 0;
121}
122
123static int init_threads(struct gfs2_sbd *sdp)
124{
125 struct task_struct *p;
126 int error = 0;
127
128 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
129 if (IS_ERR(p)) {
130 error = PTR_ERR(p);
131 fs_err(sdp, "can't start logd thread: %d\n", error);
132 return error;
133 }
134 sdp->sd_logd_process = p;
135
136 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
137 if (IS_ERR(p)) {
138 error = PTR_ERR(p);
139 fs_err(sdp, "can't start quotad thread: %d\n", error);
140 goto fail;
141 }
142 sdp->sd_quotad_process = p;
143 return 0;
144
145fail:
146 kthread_stop(sdp->sd_logd_process);
147 sdp->sd_logd_process = NULL;
148 return error;
149}
150
151/**
152 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
153 * @sdp: the filesystem
154 *
155 * Returns: errno
156 */
157
158int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
159{
160 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
161 struct gfs2_glock *j_gl = ip->i_gl;
162 struct gfs2_holder freeze_gh;
163 struct gfs2_log_header_host head;
164 int error;
165
166 error = init_threads(sdp);
167 if (error)
168 return error;
169
170 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
171 LM_FLAG_NOEXP | GL_EXACT,
172 &freeze_gh);
173 if (error)
174 goto fail_threads;
175
176 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
177 if (gfs2_withdrawn(sdp)) {
178 error = -EIO;
179 goto fail;
180 }
181
182 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
183 if (error || gfs2_withdrawn(sdp))
184 goto fail;
185
186 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
187 gfs2_consist(sdp);
188 error = -EIO;
189 goto fail;
190 }
191
192 /* Initialize some head of the log stuff */
193 sdp->sd_log_sequence = head.lh_sequence + 1;
194 gfs2_log_pointers_init(sdp, head.lh_blkno);
195
196 error = gfs2_quota_init(sdp);
197 if (error || gfs2_withdrawn(sdp))
198 goto fail;
199
200 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
201
202 gfs2_glock_dq_uninit(&freeze_gh);
203
204 return 0;
205
206fail:
207 gfs2_glock_dq_uninit(&freeze_gh);
208fail_threads:
209 if (sdp->sd_quotad_process)
210 kthread_stop(sdp->sd_quotad_process);
211 sdp->sd_quotad_process = NULL;
212 if (sdp->sd_logd_process)
213 kthread_stop(sdp->sd_logd_process);
214 sdp->sd_logd_process = NULL;
215 return error;
216}
217
218void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
219{
220 const struct gfs2_statfs_change *str = buf;
221
222 sc->sc_total = be64_to_cpu(str->sc_total);
223 sc->sc_free = be64_to_cpu(str->sc_free);
224 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
225}
226
227static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
228{
229 struct gfs2_statfs_change *str = buf;
230
231 str->sc_total = cpu_to_be64(sc->sc_total);
232 str->sc_free = cpu_to_be64(sc->sc_free);
233 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
234}
235
236int gfs2_statfs_init(struct gfs2_sbd *sdp)
237{
238 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
239 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
240 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
241 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
242 struct buffer_head *m_bh, *l_bh;
243 struct gfs2_holder gh;
244 int error;
245
246 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
247 &gh);
248 if (error)
249 return error;
250
251 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
252 if (error)
253 goto out;
254
255 if (sdp->sd_args.ar_spectator) {
256 spin_lock(&sdp->sd_statfs_spin);
257 gfs2_statfs_change_in(m_sc, m_bh->b_data +
258 sizeof(struct gfs2_dinode));
259 spin_unlock(&sdp->sd_statfs_spin);
260 } else {
261 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
262 if (error)
263 goto out_m_bh;
264
265 spin_lock(&sdp->sd_statfs_spin);
266 gfs2_statfs_change_in(m_sc, m_bh->b_data +
267 sizeof(struct gfs2_dinode));
268 gfs2_statfs_change_in(l_sc, l_bh->b_data +
269 sizeof(struct gfs2_dinode));
270 spin_unlock(&sdp->sd_statfs_spin);
271
272 brelse(l_bh);
273 }
274
275out_m_bh:
276 brelse(m_bh);
277out:
278 gfs2_glock_dq_uninit(&gh);
279 return 0;
280}
281
282void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
283 s64 dinodes)
284{
285 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
286 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
287 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
288 struct buffer_head *l_bh;
289 s64 x, y;
290 int need_sync = 0;
291 int error;
292
293 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
294 if (error)
295 return;
296
297 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
298
299 spin_lock(&sdp->sd_statfs_spin);
300 l_sc->sc_total += total;
301 l_sc->sc_free += free;
302 l_sc->sc_dinodes += dinodes;
303 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
304 if (sdp->sd_args.ar_statfs_percent) {
305 x = 100 * l_sc->sc_free;
306 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
307 if (x >= y || x <= -y)
308 need_sync = 1;
309 }
310 spin_unlock(&sdp->sd_statfs_spin);
311
312 brelse(l_bh);
313 if (need_sync)
314 gfs2_wake_up_statfs(sdp);
315}
316
317void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
318 struct buffer_head *l_bh)
319{
320 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
321 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
322 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
323 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
324
325 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
326 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
327
328 spin_lock(&sdp->sd_statfs_spin);
329 m_sc->sc_total += l_sc->sc_total;
330 m_sc->sc_free += l_sc->sc_free;
331 m_sc->sc_dinodes += l_sc->sc_dinodes;
332 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
333 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
334 0, sizeof(struct gfs2_statfs_change));
335 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
336 spin_unlock(&sdp->sd_statfs_spin);
337}
338
339int gfs2_statfs_sync(struct super_block *sb, int type)
340{
341 struct gfs2_sbd *sdp = sb->s_fs_info;
342 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
343 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
344 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
345 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
346 struct gfs2_holder gh;
347 struct buffer_head *m_bh, *l_bh;
348 int error;
349
350 sb_start_write(sb);
351 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
352 &gh);
353 if (error)
354 goto out;
355
356 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
357 if (error)
358 goto out_unlock;
359
360 spin_lock(&sdp->sd_statfs_spin);
361 gfs2_statfs_change_in(m_sc, m_bh->b_data +
362 sizeof(struct gfs2_dinode));
363 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
364 spin_unlock(&sdp->sd_statfs_spin);
365 goto out_bh;
366 }
367 spin_unlock(&sdp->sd_statfs_spin);
368
369 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
370 if (error)
371 goto out_bh;
372
373 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
374 if (error)
375 goto out_bh2;
376
377 update_statfs(sdp, m_bh, l_bh);
378 sdp->sd_statfs_force_sync = 0;
379
380 gfs2_trans_end(sdp);
381
382out_bh2:
383 brelse(l_bh);
384out_bh:
385 brelse(m_bh);
386out_unlock:
387 gfs2_glock_dq_uninit(&gh);
388out:
389 sb_end_write(sb);
390 return error;
391}
392
393struct lfcc {
394 struct list_head list;
395 struct gfs2_holder gh;
396};
397
398/**
399 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
400 * journals are clean
401 * @sdp: the file system
402 * @state: the state to put the transaction lock into
403 * @t_gh: the hold on the transaction lock
404 *
405 * Returns: errno
406 */
407
408static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
409{
410 struct gfs2_inode *ip;
411 struct gfs2_jdesc *jd;
412 struct lfcc *lfcc;
413 LIST_HEAD(list);
414 struct gfs2_log_header_host lh;
415 int error;
416
417 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
418 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
419 if (!lfcc) {
420 error = -ENOMEM;
421 goto out;
422 }
423 ip = GFS2_I(jd->jd_inode);
424 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
425 if (error) {
426 kfree(lfcc);
427 goto out;
428 }
429 list_add(&lfcc->list, &list);
430 }
431
432 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
433 LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
434 if (error)
435 goto out;
436
437 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
438 error = gfs2_jdesc_check(jd);
439 if (error)
440 break;
441 error = gfs2_find_jhead(jd, &lh, false);
442 if (error)
443 break;
444 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
445 error = -EBUSY;
446 break;
447 }
448 }
449
450 if (error)
451 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
452
453out:
454 while (!list_empty(&list)) {
455 lfcc = list_first_entry(&list, struct lfcc, list);
456 list_del(&lfcc->list);
457 gfs2_glock_dq_uninit(&lfcc->gh);
458 kfree(lfcc);
459 }
460 return error;
461}
462
463void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
464{
465 struct gfs2_dinode *str = buf;
466
467 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
468 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
469 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
470 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
471 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
472 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
473 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
474 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
475 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
476 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
477 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
478 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
479 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
480 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
481
482 str->di_goal_meta = cpu_to_be64(ip->i_goal);
483 str->di_goal_data = cpu_to_be64(ip->i_goal);
484 str->di_generation = cpu_to_be64(ip->i_generation);
485
486 str->di_flags = cpu_to_be32(ip->i_diskflags);
487 str->di_height = cpu_to_be16(ip->i_height);
488 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
489 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
490 GFS2_FORMAT_DE : 0);
491 str->di_depth = cpu_to_be16(ip->i_depth);
492 str->di_entries = cpu_to_be32(ip->i_entries);
493
494 str->di_eattr = cpu_to_be64(ip->i_eattr);
495 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
496 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
497 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
498}
499
500/**
501 * gfs2_write_inode - Make sure the inode is stable on the disk
502 * @inode: The inode
503 * @wbc: The writeback control structure
504 *
505 * Returns: errno
506 */
507
508static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
509{
510 struct gfs2_inode *ip = GFS2_I(inode);
511 struct gfs2_sbd *sdp = GFS2_SB(inode);
512 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
513 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
514 int ret = 0;
515 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
516
517 if (flush_all)
518 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
519 GFS2_LOG_HEAD_FLUSH_NORMAL |
520 GFS2_LFC_WRITE_INODE);
521 if (bdi->wb.dirty_exceeded)
522 gfs2_ail1_flush(sdp, wbc);
523 else
524 filemap_fdatawrite(metamapping);
525 if (flush_all)
526 ret = filemap_fdatawait(metamapping);
527 if (ret)
528 mark_inode_dirty_sync(inode);
529 else {
530 spin_lock(&inode->i_lock);
531 if (!(inode->i_flags & I_DIRTY))
532 gfs2_ordered_del_inode(ip);
533 spin_unlock(&inode->i_lock);
534 }
535 return ret;
536}
537
538/**
539 * gfs2_dirty_inode - check for atime updates
540 * @inode: The inode in question
541 * @flags: The type of dirty
542 *
543 * Unfortunately it can be called under any combination of inode
544 * glock and transaction lock, so we have to check carefully.
545 *
546 * At the moment this deals only with atime - it should be possible
547 * to expand that role in future, once a review of the locking has
548 * been carried out.
549 */
550
551static void gfs2_dirty_inode(struct inode *inode, int flags)
552{
553 struct gfs2_inode *ip = GFS2_I(inode);
554 struct gfs2_sbd *sdp = GFS2_SB(inode);
555 struct buffer_head *bh;
556 struct gfs2_holder gh;
557 int need_unlock = 0;
558 int need_endtrans = 0;
559 int ret;
560
561 if (!(flags & I_DIRTY_INODE))
562 return;
563 if (unlikely(gfs2_withdrawn(sdp)))
564 return;
565 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
566 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
567 if (ret) {
568 fs_err(sdp, "dirty_inode: glock %d\n", ret);
569 gfs2_dump_glock(NULL, ip->i_gl, true);
570 return;
571 }
572 need_unlock = 1;
573 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
574 return;
575
576 if (current->journal_info == NULL) {
577 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
578 if (ret) {
579 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
580 goto out;
581 }
582 need_endtrans = 1;
583 }
584
585 ret = gfs2_meta_inode_buffer(ip, &bh);
586 if (ret == 0) {
587 gfs2_trans_add_meta(ip->i_gl, bh);
588 gfs2_dinode_out(ip, bh->b_data);
589 brelse(bh);
590 }
591
592 if (need_endtrans)
593 gfs2_trans_end(sdp);
594out:
595 if (need_unlock)
596 gfs2_glock_dq_uninit(&gh);
597}
598
599/**
600 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
601 * @sdp: the filesystem
602 *
603 * Returns: errno
604 */
605
606int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
607{
608 struct gfs2_holder freeze_gh;
609 int error = 0;
610 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
611
612 gfs2_holder_mark_uninitialized(&freeze_gh);
613 if (sdp->sd_freeze_gl &&
614 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
615 if (!log_write_allowed) {
616 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
617 LM_ST_SHARED, LM_FLAG_TRY |
618 LM_FLAG_NOEXP | GL_EXACT,
619 &freeze_gh);
620 if (error == GLR_TRYFAILED)
621 error = 0;
622 } else {
623 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
624 LM_ST_SHARED,
625 LM_FLAG_NOEXP | GL_EXACT,
626 &freeze_gh);
627 if (error && !gfs2_withdrawn(sdp))
628 return error;
629 }
630 }
631
632 gfs2_flush_delete_work(sdp);
633 if (!log_write_allowed && current == sdp->sd_quotad_process)
634 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
635 else if (sdp->sd_quotad_process)
636 kthread_stop(sdp->sd_quotad_process);
637 sdp->sd_quotad_process = NULL;
638
639 if (!log_write_allowed && current == sdp->sd_logd_process)
640 fs_warn(sdp, "The logd daemon is withdrawing.\n");
641 else if (sdp->sd_logd_process)
642 kthread_stop(sdp->sd_logd_process);
643 sdp->sd_logd_process = NULL;
644
645 if (log_write_allowed) {
646 gfs2_quota_sync(sdp->sd_vfs, 0);
647 gfs2_statfs_sync(sdp->sd_vfs, 0);
648
649 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
650 GFS2_LFC_MAKE_FS_RO);
651 wait_event(sdp->sd_reserving_log_wait,
652 atomic_read(&sdp->sd_reserving_log) == 0);
653 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) ==
654 sdp->sd_jdesc->jd_blocks);
655 } else {
656 wait_event_timeout(sdp->sd_reserving_log_wait,
657 atomic_read(&sdp->sd_reserving_log) == 0,
658 HZ * 5);
659 }
660 if (gfs2_holder_initialized(&freeze_gh))
661 gfs2_glock_dq_uninit(&freeze_gh);
662
663 gfs2_quota_cleanup(sdp);
664
665 if (!log_write_allowed)
666 sdp->sd_vfs->s_flags |= SB_RDONLY;
667
668 return error;
669}
670
671/**
672 * gfs2_put_super - Unmount the filesystem
673 * @sb: The VFS superblock
674 *
675 */
676
677static void gfs2_put_super(struct super_block *sb)
678{
679 struct gfs2_sbd *sdp = sb->s_fs_info;
680 int error;
681 struct gfs2_jdesc *jd;
682
683 /* No more recovery requests */
684 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
685 smp_mb();
686
687 /* Wait on outstanding recovery */
688restart:
689 spin_lock(&sdp->sd_jindex_spin);
690 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
691 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
692 continue;
693 spin_unlock(&sdp->sd_jindex_spin);
694 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
695 TASK_UNINTERRUPTIBLE);
696 goto restart;
697 }
698 spin_unlock(&sdp->sd_jindex_spin);
699
700 if (!sb_rdonly(sb)) {
701 error = gfs2_make_fs_ro(sdp);
702 if (error)
703 gfs2_io_error(sdp);
704 }
705 /* At this point, we're through modifying the disk */
706
707 /* Release stuff */
708
709 iput(sdp->sd_jindex);
710 iput(sdp->sd_statfs_inode);
711 iput(sdp->sd_rindex);
712 iput(sdp->sd_quota_inode);
713
714 gfs2_glock_put(sdp->sd_rename_gl);
715 gfs2_glock_put(sdp->sd_freeze_gl);
716
717 if (!sdp->sd_args.ar_spectator) {
718 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
719 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
720 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
721 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
722 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
723 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
724 iput(sdp->sd_sc_inode);
725 iput(sdp->sd_qc_inode);
726 }
727
728 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
729 gfs2_clear_rgrpd(sdp);
730 gfs2_jindex_free(sdp);
731 /* Take apart glock structures and buffer lists */
732 gfs2_gl_hash_clear(sdp);
733 gfs2_delete_debugfs_file(sdp);
734 /* Unmount the locking protocol */
735 gfs2_lm_unmount(sdp);
736
737 /* At this point, we're through participating in the lockspace */
738 gfs2_sys_fs_del(sdp);
739}
740
741/**
742 * gfs2_sync_fs - sync the filesystem
743 * @sb: the superblock
744 *
745 * Flushes the log to disk.
746 */
747
748static int gfs2_sync_fs(struct super_block *sb, int wait)
749{
750 struct gfs2_sbd *sdp = sb->s_fs_info;
751
752 gfs2_quota_sync(sb, -1);
753 if (wait)
754 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
755 GFS2_LFC_SYNC_FS);
756 return sdp->sd_log_error;
757}
758
759void gfs2_freeze_func(struct work_struct *work)
760{
761 int error;
762 struct gfs2_holder freeze_gh;
763 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
764 struct super_block *sb = sdp->sd_vfs;
765
766 atomic_inc(&sb->s_active);
767 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
768 LM_FLAG_NOEXP | GL_EXACT, &freeze_gh);
769 if (error) {
770 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
771 gfs2_assert_withdraw(sdp, 0);
772 } else {
773 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
774 error = thaw_super(sb);
775 if (error) {
776 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
777 error);
778 gfs2_assert_withdraw(sdp, 0);
779 }
780 gfs2_glock_dq_uninit(&freeze_gh);
781 }
782 deactivate_super(sb);
783 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
784 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
785 return;
786}
787
788/**
789 * gfs2_freeze - prevent further writes to the filesystem
790 * @sb: the VFS structure for the filesystem
791 *
792 */
793
794static int gfs2_freeze(struct super_block *sb)
795{
796 struct gfs2_sbd *sdp = sb->s_fs_info;
797 int error = 0;
798
799 mutex_lock(&sdp->sd_freeze_mutex);
800 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
801 goto out;
802
803 for (;;) {
804 if (gfs2_withdrawn(sdp)) {
805 error = -EINVAL;
806 goto out;
807 }
808
809 error = gfs2_lock_fs_check_clean(sdp);
810 if (!error)
811 break;
812
813 if (error == -EBUSY)
814 fs_err(sdp, "waiting for recovery before freeze\n");
815 else if (error == -EIO) {
816 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
817 "to recovery error.\n");
818 goto out;
819 } else {
820 fs_err(sdp, "error freezing FS: %d\n", error);
821 }
822 fs_err(sdp, "retrying...\n");
823 msleep(1000);
824 }
825 set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
826out:
827 mutex_unlock(&sdp->sd_freeze_mutex);
828 return error;
829}
830
831/**
832 * gfs2_unfreeze - reallow writes to the filesystem
833 * @sb: the VFS structure for the filesystem
834 *
835 */
836
837static int gfs2_unfreeze(struct super_block *sb)
838{
839 struct gfs2_sbd *sdp = sb->s_fs_info;
840
841 mutex_lock(&sdp->sd_freeze_mutex);
842 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
843 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
844 mutex_unlock(&sdp->sd_freeze_mutex);
845 return 0;
846 }
847
848 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
849 mutex_unlock(&sdp->sd_freeze_mutex);
850 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
851}
852
853/**
854 * statfs_fill - fill in the sg for a given RG
855 * @rgd: the RG
856 * @sc: the sc structure
857 *
858 * Returns: 0 on success, -ESTALE if the LVB is invalid
859 */
860
861static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
862 struct gfs2_statfs_change_host *sc)
863{
864 gfs2_rgrp_verify(rgd);
865 sc->sc_total += rgd->rd_data;
866 sc->sc_free += rgd->rd_free;
867 sc->sc_dinodes += rgd->rd_dinodes;
868 return 0;
869}
870
871/**
872 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
873 * @sdp: the filesystem
874 * @sc: the sc info that will be returned
875 *
876 * Any error (other than a signal) will cause this routine to fall back
877 * to the synchronous version.
878 *
879 * FIXME: This really shouldn't busy wait like this.
880 *
881 * Returns: errno
882 */
883
884static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
885{
886 struct gfs2_rgrpd *rgd_next;
887 struct gfs2_holder *gha, *gh;
888 unsigned int slots = 64;
889 unsigned int x;
890 int done;
891 int error = 0, err;
892
893 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
894 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
895 if (!gha)
896 return -ENOMEM;
897 for (x = 0; x < slots; x++)
898 gfs2_holder_mark_uninitialized(gha + x);
899
900 rgd_next = gfs2_rgrpd_get_first(sdp);
901
902 for (;;) {
903 done = 1;
904
905 for (x = 0; x < slots; x++) {
906 gh = gha + x;
907
908 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
909 err = gfs2_glock_wait(gh);
910 if (err) {
911 gfs2_holder_uninit(gh);
912 error = err;
913 } else {
914 if (!error) {
915 struct gfs2_rgrpd *rgd =
916 gfs2_glock2rgrp(gh->gh_gl);
917
918 error = statfs_slow_fill(rgd, sc);
919 }
920 gfs2_glock_dq_uninit(gh);
921 }
922 }
923
924 if (gfs2_holder_initialized(gh))
925 done = 0;
926 else if (rgd_next && !error) {
927 error = gfs2_glock_nq_init(rgd_next->rd_gl,
928 LM_ST_SHARED,
929 GL_ASYNC,
930 gh);
931 rgd_next = gfs2_rgrpd_get_next(rgd_next);
932 done = 0;
933 }
934
935 if (signal_pending(current))
936 error = -ERESTARTSYS;
937 }
938
939 if (done)
940 break;
941
942 yield();
943 }
944
945 kfree(gha);
946 return error;
947}
948
949/**
950 * gfs2_statfs_i - Do a statfs
951 * @sdp: the filesystem
952 * @sg: the sg structure
953 *
954 * Returns: errno
955 */
956
957static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
958{
959 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
960 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
961
962 spin_lock(&sdp->sd_statfs_spin);
963
964 *sc = *m_sc;
965 sc->sc_total += l_sc->sc_total;
966 sc->sc_free += l_sc->sc_free;
967 sc->sc_dinodes += l_sc->sc_dinodes;
968
969 spin_unlock(&sdp->sd_statfs_spin);
970
971 if (sc->sc_free < 0)
972 sc->sc_free = 0;
973 if (sc->sc_free > sc->sc_total)
974 sc->sc_free = sc->sc_total;
975 if (sc->sc_dinodes < 0)
976 sc->sc_dinodes = 0;
977
978 return 0;
979}
980
981/**
982 * gfs2_statfs - Gather and return stats about the filesystem
983 * @sb: The superblock
984 * @statfsbuf: The buffer
985 *
986 * Returns: 0 on success or error code
987 */
988
989static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
990{
991 struct super_block *sb = dentry->d_sb;
992 struct gfs2_sbd *sdp = sb->s_fs_info;
993 struct gfs2_statfs_change_host sc;
994 int error;
995
996 error = gfs2_rindex_update(sdp);
997 if (error)
998 return error;
999
1000 if (gfs2_tune_get(sdp, gt_statfs_slow))
1001 error = gfs2_statfs_slow(sdp, &sc);
1002 else
1003 error = gfs2_statfs_i(sdp, &sc);
1004
1005 if (error)
1006 return error;
1007
1008 buf->f_type = GFS2_MAGIC;
1009 buf->f_bsize = sdp->sd_sb.sb_bsize;
1010 buf->f_blocks = sc.sc_total;
1011 buf->f_bfree = sc.sc_free;
1012 buf->f_bavail = sc.sc_free;
1013 buf->f_files = sc.sc_dinodes + sc.sc_free;
1014 buf->f_ffree = sc.sc_free;
1015 buf->f_namelen = GFS2_FNAMESIZE;
1016
1017 return 0;
1018}
1019
1020/**
1021 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1022 * @inode: The inode to drop
1023 *
1024 * If we've received a callback on an iopen lock then it's because a
1025 * remote node tried to deallocate the inode but failed due to this node
1026 * still having the inode open. Here we mark the link count zero
1027 * since we know that it must have reached zero if the GLF_DEMOTE flag
1028 * is set on the iopen glock. If we didn't do a disk read since the
1029 * remote node removed the final link then we might otherwise miss
1030 * this event. This check ensures that this node will deallocate the
1031 * inode's blocks, or alternatively pass the baton on to another
1032 * node for later deallocation.
1033 */
1034
1035static int gfs2_drop_inode(struct inode *inode)
1036{
1037 struct gfs2_inode *ip = GFS2_I(inode);
1038
1039 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1040 inode->i_nlink &&
1041 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1042 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1043 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1044 clear_nlink(inode);
1045 }
1046
1047 /*
1048 * When under memory pressure when an inode's link count has dropped to
1049 * zero, defer deleting the inode to the delete workqueue. This avoids
1050 * calling into DLM under memory pressure, which can deadlock.
1051 */
1052 if (!inode->i_nlink &&
1053 unlikely(current->flags & PF_MEMALLOC) &&
1054 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1055 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1056
1057 gfs2_glock_hold(gl);
1058 if (!gfs2_queue_delete_work(gl, 0))
1059 gfs2_glock_queue_put(gl);
1060 return false;
1061 }
1062
1063 return generic_drop_inode(inode);
1064}
1065
1066static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1067{
1068 do {
1069 if (d1 == d2)
1070 return 1;
1071 d1 = d1->d_parent;
1072 } while (!IS_ROOT(d1));
1073 return 0;
1074}
1075
1076/**
1077 * gfs2_show_options - Show mount options for /proc/mounts
1078 * @s: seq_file structure
1079 * @root: root of this (sub)tree
1080 *
1081 * Returns: 0 on success or error code
1082 */
1083
1084static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1085{
1086 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1087 struct gfs2_args *args = &sdp->sd_args;
1088 int val;
1089
1090 if (is_ancestor(root, sdp->sd_master_dir))
1091 seq_puts(s, ",meta");
1092 if (args->ar_lockproto[0])
1093 seq_show_option(s, "lockproto", args->ar_lockproto);
1094 if (args->ar_locktable[0])
1095 seq_show_option(s, "locktable", args->ar_locktable);
1096 if (args->ar_hostdata[0])
1097 seq_show_option(s, "hostdata", args->ar_hostdata);
1098 if (args->ar_spectator)
1099 seq_puts(s, ",spectator");
1100 if (args->ar_localflocks)
1101 seq_puts(s, ",localflocks");
1102 if (args->ar_debug)
1103 seq_puts(s, ",debug");
1104 if (args->ar_posix_acl)
1105 seq_puts(s, ",acl");
1106 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1107 char *state;
1108 switch (args->ar_quota) {
1109 case GFS2_QUOTA_OFF:
1110 state = "off";
1111 break;
1112 case GFS2_QUOTA_ACCOUNT:
1113 state = "account";
1114 break;
1115 case GFS2_QUOTA_ON:
1116 state = "on";
1117 break;
1118 default:
1119 state = "unknown";
1120 break;
1121 }
1122 seq_printf(s, ",quota=%s", state);
1123 }
1124 if (args->ar_suiddir)
1125 seq_puts(s, ",suiddir");
1126 if (args->ar_data != GFS2_DATA_DEFAULT) {
1127 char *state;
1128 switch (args->ar_data) {
1129 case GFS2_DATA_WRITEBACK:
1130 state = "writeback";
1131 break;
1132 case GFS2_DATA_ORDERED:
1133 state = "ordered";
1134 break;
1135 default:
1136 state = "unknown";
1137 break;
1138 }
1139 seq_printf(s, ",data=%s", state);
1140 }
1141 if (args->ar_discard)
1142 seq_puts(s, ",discard");
1143 val = sdp->sd_tune.gt_logd_secs;
1144 if (val != 30)
1145 seq_printf(s, ",commit=%d", val);
1146 val = sdp->sd_tune.gt_statfs_quantum;
1147 if (val != 30)
1148 seq_printf(s, ",statfs_quantum=%d", val);
1149 else if (sdp->sd_tune.gt_statfs_slow)
1150 seq_puts(s, ",statfs_quantum=0");
1151 val = sdp->sd_tune.gt_quota_quantum;
1152 if (val != 60)
1153 seq_printf(s, ",quota_quantum=%d", val);
1154 if (args->ar_statfs_percent)
1155 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1156 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1157 const char *state;
1158
1159 switch (args->ar_errors) {
1160 case GFS2_ERRORS_WITHDRAW:
1161 state = "withdraw";
1162 break;
1163 case GFS2_ERRORS_PANIC:
1164 state = "panic";
1165 break;
1166 default:
1167 state = "unknown";
1168 break;
1169 }
1170 seq_printf(s, ",errors=%s", state);
1171 }
1172 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1173 seq_puts(s, ",nobarrier");
1174 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1175 seq_puts(s, ",demote_interface_used");
1176 if (args->ar_rgrplvb)
1177 seq_puts(s, ",rgrplvb");
1178 if (args->ar_loccookie)
1179 seq_puts(s, ",loccookie");
1180 return 0;
1181}
1182
1183static void gfs2_final_release_pages(struct gfs2_inode *ip)
1184{
1185 struct inode *inode = &ip->i_inode;
1186 struct gfs2_glock *gl = ip->i_gl;
1187
1188 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1189 truncate_inode_pages(&inode->i_data, 0);
1190
1191 if (atomic_read(&gl->gl_revokes) == 0) {
1192 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1193 clear_bit(GLF_DIRTY, &gl->gl_flags);
1194 }
1195}
1196
1197static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1198{
1199 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1200 struct gfs2_rgrpd *rgd;
1201 struct gfs2_holder gh;
1202 int error;
1203
1204 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1205 gfs2_consist_inode(ip);
1206 return -EIO;
1207 }
1208
1209 error = gfs2_rindex_update(sdp);
1210 if (error)
1211 return error;
1212
1213 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1214 if (error)
1215 return error;
1216
1217 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1218 if (!rgd) {
1219 gfs2_consist_inode(ip);
1220 error = -EIO;
1221 goto out_qs;
1222 }
1223
1224 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1225 if (error)
1226 goto out_qs;
1227
1228 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1229 sdp->sd_jdesc->jd_blocks);
1230 if (error)
1231 goto out_rg_gunlock;
1232
1233 gfs2_free_di(rgd, ip);
1234
1235 gfs2_final_release_pages(ip);
1236
1237 gfs2_trans_end(sdp);
1238
1239out_rg_gunlock:
1240 gfs2_glock_dq_uninit(&gh);
1241out_qs:
1242 gfs2_quota_unhold(ip);
1243 return error;
1244}
1245
1246/**
1247 * gfs2_glock_put_eventually
1248 * @gl: The glock to put
1249 *
1250 * When under memory pressure, trigger a deferred glock put to make sure we
1251 * won't call into DLM and deadlock. Otherwise, put the glock directly.
1252 */
1253
1254static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1255{
1256 if (current->flags & PF_MEMALLOC)
1257 gfs2_glock_queue_put(gl);
1258 else
1259 gfs2_glock_put(gl);
1260}
1261
1262static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1263{
1264 struct gfs2_inode *ip = GFS2_I(inode);
1265 struct gfs2_sbd *sdp = GFS2_SB(inode);
1266 struct gfs2_holder *gh = &ip->i_iopen_gh;
1267 long timeout = 5 * HZ;
1268 int error;
1269
1270 gh->gh_flags |= GL_NOCACHE;
1271 gfs2_glock_dq_wait(gh);
1272
1273 /*
1274 * If there are no other lock holders, we'll get the lock immediately.
1275 * Otherwise, the other nodes holding the lock will be notified about
1276 * our locking request. If they don't have the inode open, they'll
1277 * evict the cached inode and release the lock. Otherwise, if they
1278 * poke the inode glock, we'll take this as an indication that they
1279 * still need the iopen glock and that they'll take care of deleting
1280 * the inode when they're done. As a last resort, if another node
1281 * keeps holding the iopen glock without showing any activity on the
1282 * inode glock, we'll eventually time out.
1283 *
1284 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1285 * locking request as an optimization to notify lock holders as soon as
1286 * possible. Without that flag, they'd be notified implicitly by the
1287 * second locking request.
1288 */
1289
1290 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1291 error = gfs2_glock_nq(gh);
1292 if (error != GLR_TRYFAILED)
1293 return !error;
1294
1295 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1296 error = gfs2_glock_nq(gh);
1297 if (error)
1298 return false;
1299
1300 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1301 !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1302 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1303 timeout);
1304 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1305 gfs2_glock_dq(gh);
1306 return false;
1307 }
1308 return true;
1309}
1310
1311/**
1312 * gfs2_evict_inode - Remove an inode from cache
1313 * @inode: The inode to evict
1314 *
1315 * There are three cases to consider:
1316 * 1. i_nlink == 0, we are final opener (and must deallocate)
1317 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1318 * 3. i_nlink > 0
1319 *
1320 * If the fs is read only, then we have to treat all cases as per #3
1321 * since we are unable to do any deallocation. The inode will be
1322 * deallocated by the next read/write node to attempt an allocation
1323 * in the same resource group
1324 *
1325 * We have to (at the moment) hold the inodes main lock to cover
1326 * the gap between unlocking the shared lock on the iopen lock and
1327 * taking the exclusive lock. I'd rather do a shared -> exclusive
1328 * conversion on the iopen lock, but we can change that later. This
1329 * is safe, just less efficient.
1330 */
1331
1332static void gfs2_evict_inode(struct inode *inode)
1333{
1334 struct super_block *sb = inode->i_sb;
1335 struct gfs2_sbd *sdp = sb->s_fs_info;
1336 struct gfs2_inode *ip = GFS2_I(inode);
1337 struct gfs2_holder gh;
1338 struct address_space *metamapping;
1339 int error;
1340
1341 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1342 clear_inode(inode);
1343 return;
1344 }
1345
1346 if (inode->i_nlink || sb_rdonly(sb))
1347 goto out;
1348
1349 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1350 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1351 gfs2_holder_mark_uninitialized(&gh);
1352 goto out_delete;
1353 }
1354
1355 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1356 goto out;
1357
1358 /* Deletes should never happen under memory pressure anymore. */
1359 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1360 goto out;
1361
1362 /* Must not read inode block until block type has been verified */
1363 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1364 if (unlikely(error)) {
1365 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1366 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1367 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1368 goto out;
1369 }
1370
1371 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1372 goto out_truncate;
1373 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1374 if (error)
1375 goto out_truncate;
1376
1377 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1378 error = gfs2_inode_refresh(ip);
1379 if (error)
1380 goto out_truncate;
1381 }
1382
1383 /*
1384 * The inode may have been recreated in the meantime.
1385 */
1386 if (inode->i_nlink)
1387 goto out_truncate;
1388
1389out_delete:
1390 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1391 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1392 if (!gfs2_upgrade_iopen_glock(inode)) {
1393 gfs2_holder_uninit(&ip->i_iopen_gh);
1394 goto out_truncate;
1395 }
1396 }
1397
1398 if (S_ISDIR(inode->i_mode) &&
1399 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1400 error = gfs2_dir_exhash_dealloc(ip);
1401 if (error)
1402 goto out_unlock;
1403 }
1404
1405 if (ip->i_eattr) {
1406 error = gfs2_ea_dealloc(ip);
1407 if (error)
1408 goto out_unlock;
1409 }
1410
1411 if (!gfs2_is_stuffed(ip)) {
1412 error = gfs2_file_dealloc(ip);
1413 if (error)
1414 goto out_unlock;
1415 }
1416
1417 /* We're about to clear the bitmap for the dinode, but as soon as we
1418 do, gfs2_create_inode can create another inode at the same block
1419 location and try to set gl_object again. We clear gl_object here so
1420 that subsequent inode creates don't see an old gl_object. */
1421 glock_clear_object(ip->i_gl, ip);
1422 error = gfs2_dinode_dealloc(ip);
1423 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1424 goto out_unlock;
1425
1426out_truncate:
1427 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1428 GFS2_LFC_EVICT_INODE);
1429 metamapping = gfs2_glock2aspace(ip->i_gl);
1430 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1431 filemap_fdatawrite(metamapping);
1432 filemap_fdatawait(metamapping);
1433 }
1434 write_inode_now(inode, 1);
1435 gfs2_ail_flush(ip->i_gl, 0);
1436
1437 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1438 if (error)
1439 goto out_unlock;
1440 /* Needs to be done before glock release & also in a transaction */
1441 truncate_inode_pages(&inode->i_data, 0);
1442 truncate_inode_pages(metamapping, 0);
1443 gfs2_trans_end(sdp);
1444
1445out_unlock:
1446 if (gfs2_rs_active(&ip->i_res))
1447 gfs2_rs_deltree(&ip->i_res);
1448
1449 if (gfs2_holder_initialized(&gh)) {
1450 glock_clear_object(ip->i_gl, ip);
1451 gfs2_glock_dq_uninit(&gh);
1452 }
1453 if (error && error != GLR_TRYFAILED && error != -EROFS)
1454 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1455out:
1456 truncate_inode_pages_final(&inode->i_data);
1457 if (ip->i_qadata)
1458 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1459 gfs2_rs_delete(ip, NULL);
1460 gfs2_ordered_del_inode(ip);
1461 clear_inode(inode);
1462 gfs2_dir_hash_inval(ip);
1463 if (ip->i_gl) {
1464 glock_clear_object(ip->i_gl, ip);
1465 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1466 gfs2_glock_add_to_lru(ip->i_gl);
1467 gfs2_glock_put_eventually(ip->i_gl);
1468 ip->i_gl = NULL;
1469 }
1470 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1471 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1472
1473 glock_clear_object(gl, ip);
1474 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1475 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1476 gfs2_glock_dq(&ip->i_iopen_gh);
1477 }
1478 gfs2_glock_hold(gl);
1479 gfs2_holder_uninit(&ip->i_iopen_gh);
1480 gfs2_glock_put_eventually(gl);
1481 }
1482}
1483
1484static struct inode *gfs2_alloc_inode(struct super_block *sb)
1485{
1486 struct gfs2_inode *ip;
1487
1488 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1489 if (!ip)
1490 return NULL;
1491 ip->i_flags = 0;
1492 ip->i_gl = NULL;
1493 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1494 memset(&ip->i_res, 0, sizeof(ip->i_res));
1495 RB_CLEAR_NODE(&ip->i_res.rs_node);
1496 ip->i_rahead = 0;
1497 return &ip->i_inode;
1498}
1499
1500static void gfs2_free_inode(struct inode *inode)
1501{
1502 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1503}
1504
1505const struct super_operations gfs2_super_ops = {
1506 .alloc_inode = gfs2_alloc_inode,
1507 .free_inode = gfs2_free_inode,
1508 .write_inode = gfs2_write_inode,
1509 .dirty_inode = gfs2_dirty_inode,
1510 .evict_inode = gfs2_evict_inode,
1511 .put_super = gfs2_put_super,
1512 .sync_fs = gfs2_sync_fs,
1513 .freeze_super = gfs2_freeze,
1514 .thaw_super = gfs2_unfreeze,
1515 .statfs = gfs2_statfs,
1516 .drop_inode = gfs2_drop_inode,
1517 .show_options = gfs2_show_options,
1518};
1519