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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 #include <linux/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24 #include <linux/wait.h>
25 #include <linux/writeback.h>
26
27 #include "gfs2.h"
28 #include "incore.h"
29 #include "bmap.h"
30 #include "dir.h"
31 #include "glock.h"
32 #include "glops.h"
33 #include "inode.h"
34 #include "log.h"
35 #include "meta_io.h"
36 #include "quota.h"
37 #include "recovery.h"
38 #include "rgrp.h"
39 #include "super.h"
40 #include "trans.h"
41 #include "util.h"
42 #include "sys.h"
43 #include "xattr.h"
44
45 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
46
47 enum {
48         Opt_lockproto,
49         Opt_locktable,
50         Opt_hostdata,
51         Opt_spectator,
52         Opt_ignore_local_fs,
53         Opt_localflocks,
54         Opt_localcaching,
55         Opt_debug,
56         Opt_nodebug,
57         Opt_upgrade,
58         Opt_acl,
59         Opt_noacl,
60         Opt_quota_off,
61         Opt_quota_account,
62         Opt_quota_on,
63         Opt_quota,
64         Opt_noquota,
65         Opt_suiddir,
66         Opt_nosuiddir,
67         Opt_data_writeback,
68         Opt_data_ordered,
69         Opt_meta,
70         Opt_discard,
71         Opt_nodiscard,
72         Opt_commit,
73         Opt_err_withdraw,
74         Opt_err_panic,
75         Opt_statfs_quantum,
76         Opt_statfs_percent,
77         Opt_quota_quantum,
78         Opt_barrier,
79         Opt_nobarrier,
80         Opt_error,
81 };
82
83 static const match_table_t tokens = {
84         {Opt_lockproto, "lockproto=%s"},
85         {Opt_locktable, "locktable=%s"},
86         {Opt_hostdata, "hostdata=%s"},
87         {Opt_spectator, "spectator"},
88         {Opt_spectator, "norecovery"},
89         {Opt_ignore_local_fs, "ignore_local_fs"},
90         {Opt_localflocks, "localflocks"},
91         {Opt_localcaching, "localcaching"},
92         {Opt_debug, "debug"},
93         {Opt_nodebug, "nodebug"},
94         {Opt_upgrade, "upgrade"},
95         {Opt_acl, "acl"},
96         {Opt_noacl, "noacl"},
97         {Opt_quota_off, "quota=off"},
98         {Opt_quota_account, "quota=account"},
99         {Opt_quota_on, "quota=on"},
100         {Opt_quota, "quota"},
101         {Opt_noquota, "noquota"},
102         {Opt_suiddir, "suiddir"},
103         {Opt_nosuiddir, "nosuiddir"},
104         {Opt_data_writeback, "data=writeback"},
105         {Opt_data_ordered, "data=ordered"},
106         {Opt_meta, "meta"},
107         {Opt_discard, "discard"},
108         {Opt_nodiscard, "nodiscard"},
109         {Opt_commit, "commit=%d"},
110         {Opt_err_withdraw, "errors=withdraw"},
111         {Opt_err_panic, "errors=panic"},
112         {Opt_statfs_quantum, "statfs_quantum=%d"},
113         {Opt_statfs_percent, "statfs_percent=%d"},
114         {Opt_quota_quantum, "quota_quantum=%d"},
115         {Opt_barrier, "barrier"},
116         {Opt_nobarrier, "nobarrier"},
117         {Opt_error, NULL}
118 };
119
120 /**
121  * gfs2_mount_args - Parse mount options
122  * @args: The structure into which the parsed options will be written
123  * @options: The options to parse
124  *
125  * Return: errno
126  */
127
128 int gfs2_mount_args(struct gfs2_args *args, char *options)
129 {
130         char *o;
131         int token;
132         substring_t tmp[MAX_OPT_ARGS];
133         int rv;
134
135         /* Split the options into tokens with the "," character and
136            process them */
137
138         while (1) {
139                 o = strsep(&options, ",");
140                 if (o == NULL)
141                         break;
142                 if (*o == '\0')
143                         continue;
144
145                 token = match_token(o, tokens, tmp);
146                 switch (token) {
147                 case Opt_lockproto:
148                         match_strlcpy(args->ar_lockproto, &tmp[0],
149                                       GFS2_LOCKNAME_LEN);
150                         break;
151                 case Opt_locktable:
152                         match_strlcpy(args->ar_locktable, &tmp[0],
153                                       GFS2_LOCKNAME_LEN);
154                         break;
155                 case Opt_hostdata:
156                         match_strlcpy(args->ar_hostdata, &tmp[0],
157                                       GFS2_LOCKNAME_LEN);
158                         break;
159                 case Opt_spectator:
160                         args->ar_spectator = 1;
161                         break;
162                 case Opt_ignore_local_fs:
163                         /* Retained for backwards compat only */
164                         break;
165                 case Opt_localflocks:
166                         args->ar_localflocks = 1;
167                         break;
168                 case Opt_localcaching:
169                         /* Retained for backwards compat only */
170                         break;
171                 case Opt_debug:
172                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
173                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
174                                        "are mutually exclusive.\n");
175                                 return -EINVAL;
176                         }
177                         args->ar_debug = 1;
178                         break;
179                 case Opt_nodebug:
180                         args->ar_debug = 0;
181                         break;
182                 case Opt_upgrade:
183                         /* Retained for backwards compat only */
184                         break;
185                 case Opt_acl:
186                         args->ar_posix_acl = 1;
187                         break;
188                 case Opt_noacl:
189                         args->ar_posix_acl = 0;
190                         break;
191                 case Opt_quota_off:
192                 case Opt_noquota:
193                         args->ar_quota = GFS2_QUOTA_OFF;
194                         break;
195                 case Opt_quota_account:
196                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
197                         break;
198                 case Opt_quota_on:
199                 case Opt_quota:
200                         args->ar_quota = GFS2_QUOTA_ON;
201                         break;
202                 case Opt_suiddir:
203                         args->ar_suiddir = 1;
204                         break;
205                 case Opt_nosuiddir:
206                         args->ar_suiddir = 0;
207                         break;
208                 case Opt_data_writeback:
209                         args->ar_data = GFS2_DATA_WRITEBACK;
210                         break;
211                 case Opt_data_ordered:
212                         args->ar_data = GFS2_DATA_ORDERED;
213                         break;
214                 case Opt_meta:
215                         args->ar_meta = 1;
216                         break;
217                 case Opt_discard:
218                         args->ar_discard = 1;
219                         break;
220                 case Opt_nodiscard:
221                         args->ar_discard = 0;
222                         break;
223                 case Opt_commit:
224                         rv = match_int(&tmp[0], &args->ar_commit);
225                         if (rv || args->ar_commit <= 0) {
226                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
227                                 return rv ? rv : -EINVAL;
228                         }
229                         break;
230                 case Opt_statfs_quantum:
231                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
232                         if (rv || args->ar_statfs_quantum < 0) {
233                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
234                                 return rv ? rv : -EINVAL;
235                         }
236                         break;
237                 case Opt_quota_quantum:
238                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
239                         if (rv || args->ar_quota_quantum <= 0) {
240                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
241                                 return rv ? rv : -EINVAL;
242                         }
243                         break;
244                 case Opt_statfs_percent:
245                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
246                         if (rv || args->ar_statfs_percent < 0 ||
247                             args->ar_statfs_percent > 100) {
248                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
249                                 return rv ? rv : -EINVAL;
250                         }
251                         break;
252                 case Opt_err_withdraw:
253                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
254                         break;
255                 case Opt_err_panic:
256                         if (args->ar_debug) {
257                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
258                                         "are mutually exclusive.\n");
259                                 return -EINVAL;
260                         }
261                         args->ar_errors = GFS2_ERRORS_PANIC;
262                         break;
263                 case Opt_barrier:
264                         args->ar_nobarrier = 0;
265                         break;
266                 case Opt_nobarrier:
267                         args->ar_nobarrier = 1;
268                         break;
269                 case Opt_error:
270                 default:
271                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
272                         return -EINVAL;
273                 }
274         }
275
276         return 0;
277 }
278
279 /**
280  * gfs2_jindex_free - Clear all the journal index information
281  * @sdp: The GFS2 superblock
282  *
283  */
284
285 void gfs2_jindex_free(struct gfs2_sbd *sdp)
286 {
287         struct list_head list, *head;
288         struct gfs2_jdesc *jd;
289         struct gfs2_journal_extent *jext;
290
291         spin_lock(&sdp->sd_jindex_spin);
292         list_add(&list, &sdp->sd_jindex_list);
293         list_del_init(&sdp->sd_jindex_list);
294         sdp->sd_journals = 0;
295         spin_unlock(&sdp->sd_jindex_spin);
296
297         while (!list_empty(&list)) {
298                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
299                 head = &jd->extent_list;
300                 while (!list_empty(head)) {
301                         jext = list_entry(head->next,
302                                           struct gfs2_journal_extent,
303                                           extent_list);
304                         list_del(&jext->extent_list);
305                         kfree(jext);
306                 }
307                 list_del(&jd->jd_list);
308                 iput(jd->jd_inode);
309                 kfree(jd);
310         }
311 }
312
313 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
314 {
315         struct gfs2_jdesc *jd;
316         int found = 0;
317
318         list_for_each_entry(jd, head, jd_list) {
319                 if (jd->jd_jid == jid) {
320                         found = 1;
321                         break;
322                 }
323         }
324
325         if (!found)
326                 jd = NULL;
327
328         return jd;
329 }
330
331 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
332 {
333         struct gfs2_jdesc *jd;
334
335         spin_lock(&sdp->sd_jindex_spin);
336         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
337         spin_unlock(&sdp->sd_jindex_spin);
338
339         return jd;
340 }
341
342 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
343 {
344         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
345         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
346         u64 size = i_size_read(jd->jd_inode);
347
348         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
349                 return -EIO;
350
351         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
352
353         if (gfs2_write_alloc_required(ip, 0, size)) {
354                 gfs2_consist_inode(ip);
355                 return -EIO;
356         }
357
358         return 0;
359 }
360
361 /**
362  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
363  * @sdp: the filesystem
364  *
365  * Returns: errno
366  */
367
368 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
369 {
370         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
371         struct gfs2_glock *j_gl = ip->i_gl;
372         struct gfs2_holder t_gh;
373         struct gfs2_log_header_host head;
374         int error;
375
376         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
377         if (error)
378                 return error;
379
380         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
381
382         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
383         if (error)
384                 goto fail;
385
386         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
387                 gfs2_consist(sdp);
388                 error = -EIO;
389                 goto fail;
390         }
391
392         /*  Initialize some head of the log stuff  */
393         sdp->sd_log_sequence = head.lh_sequence + 1;
394         gfs2_log_pointers_init(sdp, head.lh_blkno);
395
396         error = gfs2_quota_init(sdp);
397         if (error)
398                 goto fail;
399
400         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
401
402         gfs2_glock_dq_uninit(&t_gh);
403
404         return 0;
405
406 fail:
407         t_gh.gh_flags |= GL_NOCACHE;
408         gfs2_glock_dq_uninit(&t_gh);
409
410         return error;
411 }
412
413 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
414 {
415         const struct gfs2_statfs_change *str = buf;
416
417         sc->sc_total = be64_to_cpu(str->sc_total);
418         sc->sc_free = be64_to_cpu(str->sc_free);
419         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
420 }
421
422 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
423 {
424         struct gfs2_statfs_change *str = buf;
425
426         str->sc_total = cpu_to_be64(sc->sc_total);
427         str->sc_free = cpu_to_be64(sc->sc_free);
428         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
429 }
430
431 int gfs2_statfs_init(struct gfs2_sbd *sdp)
432 {
433         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
434         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
435         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
436         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
437         struct buffer_head *m_bh, *l_bh;
438         struct gfs2_holder gh;
439         int error;
440
441         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
442                                    &gh);
443         if (error)
444                 return error;
445
446         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
447         if (error)
448                 goto out;
449
450         if (sdp->sd_args.ar_spectator) {
451                 spin_lock(&sdp->sd_statfs_spin);
452                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
453                                       sizeof(struct gfs2_dinode));
454                 spin_unlock(&sdp->sd_statfs_spin);
455         } else {
456                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
457                 if (error)
458                         goto out_m_bh;
459
460                 spin_lock(&sdp->sd_statfs_spin);
461                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
462                                       sizeof(struct gfs2_dinode));
463                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
464                                       sizeof(struct gfs2_dinode));
465                 spin_unlock(&sdp->sd_statfs_spin);
466
467                 brelse(l_bh);
468         }
469
470 out_m_bh:
471         brelse(m_bh);
472 out:
473         gfs2_glock_dq_uninit(&gh);
474         return 0;
475 }
476
477 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
478                         s64 dinodes)
479 {
480         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
481         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
482         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
483         struct buffer_head *l_bh;
484         s64 x, y;
485         int need_sync = 0;
486         int error;
487
488         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
489         if (error)
490                 return;
491
492         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
493
494         spin_lock(&sdp->sd_statfs_spin);
495         l_sc->sc_total += total;
496         l_sc->sc_free += free;
497         l_sc->sc_dinodes += dinodes;
498         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
499         if (sdp->sd_args.ar_statfs_percent) {
500                 x = 100 * l_sc->sc_free;
501                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
502                 if (x >= y || x <= -y)
503                         need_sync = 1;
504         }
505         spin_unlock(&sdp->sd_statfs_spin);
506
507         brelse(l_bh);
508         if (need_sync)
509                 gfs2_wake_up_statfs(sdp);
510 }
511
512 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
513                    struct buffer_head *l_bh)
514 {
515         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
516         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
517         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
518         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
519
520         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
521
522         spin_lock(&sdp->sd_statfs_spin);
523         m_sc->sc_total += l_sc->sc_total;
524         m_sc->sc_free += l_sc->sc_free;
525         m_sc->sc_dinodes += l_sc->sc_dinodes;
526         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
527         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
528                0, sizeof(struct gfs2_statfs_change));
529         spin_unlock(&sdp->sd_statfs_spin);
530
531         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
532         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
533 }
534
535 int gfs2_statfs_sync(struct super_block *sb, int type)
536 {
537         struct gfs2_sbd *sdp = sb->s_fs_info;
538         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
539         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
540         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
541         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
542         struct gfs2_holder gh;
543         struct buffer_head *m_bh, *l_bh;
544         int error;
545
546         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
547                                    &gh);
548         if (error)
549                 return error;
550
551         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
552         if (error)
553                 goto out;
554
555         spin_lock(&sdp->sd_statfs_spin);
556         gfs2_statfs_change_in(m_sc, m_bh->b_data +
557                               sizeof(struct gfs2_dinode));
558         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
559                 spin_unlock(&sdp->sd_statfs_spin);
560                 goto out_bh;
561         }
562         spin_unlock(&sdp->sd_statfs_spin);
563
564         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
565         if (error)
566                 goto out_bh;
567
568         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
569         if (error)
570                 goto out_bh2;
571
572         update_statfs(sdp, m_bh, l_bh);
573         sdp->sd_statfs_force_sync = 0;
574
575         gfs2_trans_end(sdp);
576
577 out_bh2:
578         brelse(l_bh);
579 out_bh:
580         brelse(m_bh);
581 out:
582         gfs2_glock_dq_uninit(&gh);
583         return error;
584 }
585
586 struct lfcc {
587         struct list_head list;
588         struct gfs2_holder gh;
589 };
590
591 /**
592  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
593  *                            journals are clean
594  * @sdp: the file system
595  * @state: the state to put the transaction lock into
596  * @t_gh: the hold on the transaction lock
597  *
598  * Returns: errno
599  */
600
601 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
602                                     struct gfs2_holder *t_gh)
603 {
604         struct gfs2_inode *ip;
605         struct gfs2_jdesc *jd;
606         struct lfcc *lfcc;
607         LIST_HEAD(list);
608         struct gfs2_log_header_host lh;
609         int error;
610
611         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
612                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
613                 if (!lfcc) {
614                         error = -ENOMEM;
615                         goto out;
616                 }
617                 ip = GFS2_I(jd->jd_inode);
618                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
619                 if (error) {
620                         kfree(lfcc);
621                         goto out;
622                 }
623                 list_add(&lfcc->list, &list);
624         }
625
626         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
627                                    GL_NOCACHE, t_gh);
628
629         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
630                 error = gfs2_jdesc_check(jd);
631                 if (error)
632                         break;
633                 error = gfs2_find_jhead(jd, &lh);
634                 if (error)
635                         break;
636                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
637                         error = -EBUSY;
638                         break;
639                 }
640         }
641
642         if (error)
643                 gfs2_glock_dq_uninit(t_gh);
644
645 out:
646         while (!list_empty(&list)) {
647                 lfcc = list_entry(list.next, struct lfcc, list);
648                 list_del(&lfcc->list);
649                 gfs2_glock_dq_uninit(&lfcc->gh);
650                 kfree(lfcc);
651         }
652         return error;
653 }
654
655 /**
656  * gfs2_freeze_fs - freezes the file system
657  * @sdp: the file system
658  *
659  * This function flushes data and meta data for all machines by
660  * aquiring the transaction log exclusively.  All journals are
661  * ensured to be in a clean state as well.
662  *
663  * Returns: errno
664  */
665
666 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
667 {
668         int error = 0;
669
670         mutex_lock(&sdp->sd_freeze_lock);
671
672         if (!sdp->sd_freeze_count++) {
673                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
674                 if (error)
675                         sdp->sd_freeze_count--;
676         }
677
678         mutex_unlock(&sdp->sd_freeze_lock);
679
680         return error;
681 }
682
683 /**
684  * gfs2_unfreeze_fs - unfreezes the file system
685  * @sdp: the file system
686  *
687  * This function allows the file system to proceed by unlocking
688  * the exclusively held transaction lock.  Other GFS2 nodes are
689  * now free to acquire the lock shared and go on with their lives.
690  *
691  */
692
693 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
694 {
695         mutex_lock(&sdp->sd_freeze_lock);
696
697         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
698                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
699
700         mutex_unlock(&sdp->sd_freeze_lock);
701 }
702
703
704 /**
705  * gfs2_write_inode - Make sure the inode is stable on the disk
706  * @inode: The inode
707  * @sync: synchronous write flag
708  *
709  * Returns: errno
710  */
711
712 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
713 {
714         struct gfs2_inode *ip = GFS2_I(inode);
715         struct gfs2_sbd *sdp = GFS2_SB(inode);
716         struct gfs2_holder gh;
717         struct buffer_head *bh;
718         struct timespec atime;
719         struct gfs2_dinode *di;
720         int ret = 0;
721
722         /* Check this is a "normal" inode, etc */
723         if (current->flags & PF_MEMALLOC)
724                 return 0;
725         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
726         if (ret)
727                 goto do_flush;
728         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
729         if (ret)
730                 goto do_unlock;
731         ret = gfs2_meta_inode_buffer(ip, &bh);
732         if (ret == 0) {
733                 di = (struct gfs2_dinode *)bh->b_data;
734                 atime.tv_sec = be64_to_cpu(di->di_atime);
735                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
736                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
737                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
738                         gfs2_dinode_out(ip, bh->b_data);
739                 }
740                 brelse(bh);
741         }
742         gfs2_trans_end(sdp);
743 do_unlock:
744         gfs2_glock_dq_uninit(&gh);
745 do_flush:
746         if (wbc->sync_mode == WB_SYNC_ALL)
747                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
748         return ret;
749 }
750
751 /**
752  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
753  * @sdp: the filesystem
754  *
755  * Returns: errno
756  */
757
758 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
759 {
760         struct gfs2_holder t_gh;
761         int error;
762
763         flush_workqueue(gfs2_delete_workqueue);
764         gfs2_quota_sync(sdp->sd_vfs, 0, 1);
765         gfs2_statfs_sync(sdp->sd_vfs, 0);
766
767         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
768                                    &t_gh);
769         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
770                 return error;
771
772         gfs2_meta_syncfs(sdp);
773         gfs2_log_shutdown(sdp);
774
775         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
776
777         if (t_gh.gh_gl)
778                 gfs2_glock_dq_uninit(&t_gh);
779
780         gfs2_quota_cleanup(sdp);
781
782         return error;
783 }
784
785 static int gfs2_umount_recovery_wait(void *word)
786 {
787         schedule();
788         return 0;
789 }
790
791 /**
792  * gfs2_put_super - Unmount the filesystem
793  * @sb: The VFS superblock
794  *
795  */
796
797 static void gfs2_put_super(struct super_block *sb)
798 {
799         struct gfs2_sbd *sdp = sb->s_fs_info;
800         int error;
801         struct gfs2_jdesc *jd;
802
803         /*  Unfreeze the filesystem, if we need to  */
804
805         mutex_lock(&sdp->sd_freeze_lock);
806         if (sdp->sd_freeze_count)
807                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
808         mutex_unlock(&sdp->sd_freeze_lock);
809
810         /* No more recovery requests */
811         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
812         smp_mb();
813
814         /* Wait on outstanding recovery */
815 restart:
816         spin_lock(&sdp->sd_jindex_spin);
817         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
818                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
819                         continue;
820                 spin_unlock(&sdp->sd_jindex_spin);
821                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
822                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
823                 goto restart;
824         }
825         spin_unlock(&sdp->sd_jindex_spin);
826
827         kthread_stop(sdp->sd_quotad_process);
828         kthread_stop(sdp->sd_logd_process);
829
830         if (!(sb->s_flags & MS_RDONLY)) {
831                 error = gfs2_make_fs_ro(sdp);
832                 if (error)
833                         gfs2_io_error(sdp);
834         }
835         /*  At this point, we're through modifying the disk  */
836
837         /*  Release stuff  */
838
839         iput(sdp->sd_jindex);
840         iput(sdp->sd_statfs_inode);
841         iput(sdp->sd_rindex);
842         iput(sdp->sd_quota_inode);
843
844         gfs2_glock_put(sdp->sd_rename_gl);
845         gfs2_glock_put(sdp->sd_trans_gl);
846
847         if (!sdp->sd_args.ar_spectator) {
848                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
849                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
850                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
851                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
852                 iput(sdp->sd_sc_inode);
853                 iput(sdp->sd_qc_inode);
854         }
855
856         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
857         gfs2_clear_rgrpd(sdp);
858         gfs2_jindex_free(sdp);
859         /*  Take apart glock structures and buffer lists  */
860         gfs2_gl_hash_clear(sdp);
861         /*  Unmount the locking protocol  */
862         gfs2_lm_unmount(sdp);
863
864         /*  At this point, we're through participating in the lockspace  */
865         gfs2_sys_fs_del(sdp);
866 }
867
868 /**
869  * gfs2_sync_fs - sync the filesystem
870  * @sb: the superblock
871  *
872  * Flushes the log to disk.
873  */
874
875 static int gfs2_sync_fs(struct super_block *sb, int wait)
876 {
877         if (wait && sb->s_fs_info)
878                 gfs2_log_flush(sb->s_fs_info, NULL);
879         return 0;
880 }
881
882 /**
883  * gfs2_freeze - prevent further writes to the filesystem
884  * @sb: the VFS structure for the filesystem
885  *
886  */
887
888 static int gfs2_freeze(struct super_block *sb)
889 {
890         struct gfs2_sbd *sdp = sb->s_fs_info;
891         int error;
892
893         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
894                 return -EINVAL;
895
896         for (;;) {
897                 error = gfs2_freeze_fs(sdp);
898                 if (!error)
899                         break;
900
901                 switch (error) {
902                 case -EBUSY:
903                         fs_err(sdp, "waiting for recovery before freeze\n");
904                         break;
905
906                 default:
907                         fs_err(sdp, "error freezing FS: %d\n", error);
908                         break;
909                 }
910
911                 fs_err(sdp, "retrying...\n");
912                 msleep(1000);
913         }
914         return 0;
915 }
916
917 /**
918  * gfs2_unfreeze - reallow writes to the filesystem
919  * @sb: the VFS structure for the filesystem
920  *
921  */
922
923 static int gfs2_unfreeze(struct super_block *sb)
924 {
925         gfs2_unfreeze_fs(sb->s_fs_info);
926         return 0;
927 }
928
929 /**
930  * statfs_fill - fill in the sg for a given RG
931  * @rgd: the RG
932  * @sc: the sc structure
933  *
934  * Returns: 0 on success, -ESTALE if the LVB is invalid
935  */
936
937 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
938                             struct gfs2_statfs_change_host *sc)
939 {
940         gfs2_rgrp_verify(rgd);
941         sc->sc_total += rgd->rd_data;
942         sc->sc_free += rgd->rd_free;
943         sc->sc_dinodes += rgd->rd_dinodes;
944         return 0;
945 }
946
947 /**
948  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
949  * @sdp: the filesystem
950  * @sc: the sc info that will be returned
951  *
952  * Any error (other than a signal) will cause this routine to fall back
953  * to the synchronous version.
954  *
955  * FIXME: This really shouldn't busy wait like this.
956  *
957  * Returns: errno
958  */
959
960 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
961 {
962         struct gfs2_holder ri_gh;
963         struct gfs2_rgrpd *rgd_next;
964         struct gfs2_holder *gha, *gh;
965         unsigned int slots = 64;
966         unsigned int x;
967         int done;
968         int error = 0, err;
969
970         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
971         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
972         if (!gha)
973                 return -ENOMEM;
974
975         error = gfs2_rindex_hold(sdp, &ri_gh);
976         if (error)
977                 goto out;
978
979         rgd_next = gfs2_rgrpd_get_first(sdp);
980
981         for (;;) {
982                 done = 1;
983
984                 for (x = 0; x < slots; x++) {
985                         gh = gha + x;
986
987                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
988                                 err = gfs2_glock_wait(gh);
989                                 if (err) {
990                                         gfs2_holder_uninit(gh);
991                                         error = err;
992                                 } else {
993                                         if (!error)
994                                                 error = statfs_slow_fill(
995                                                         gh->gh_gl->gl_object, sc);
996                                         gfs2_glock_dq_uninit(gh);
997                                 }
998                         }
999
1000                         if (gh->gh_gl)
1001                                 done = 0;
1002                         else if (rgd_next && !error) {
1003                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1004                                                            LM_ST_SHARED,
1005                                                            GL_ASYNC,
1006                                                            gh);
1007                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1008                                 done = 0;
1009                         }
1010
1011                         if (signal_pending(current))
1012                                 error = -ERESTARTSYS;
1013                 }
1014
1015                 if (done)
1016                         break;
1017
1018                 yield();
1019         }
1020
1021         gfs2_glock_dq_uninit(&ri_gh);
1022
1023 out:
1024         kfree(gha);
1025         return error;
1026 }
1027
1028 /**
1029  * gfs2_statfs_i - Do a statfs
1030  * @sdp: the filesystem
1031  * @sg: the sg structure
1032  *
1033  * Returns: errno
1034  */
1035
1036 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1037 {
1038         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1039         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1040
1041         spin_lock(&sdp->sd_statfs_spin);
1042
1043         *sc = *m_sc;
1044         sc->sc_total += l_sc->sc_total;
1045         sc->sc_free += l_sc->sc_free;
1046         sc->sc_dinodes += l_sc->sc_dinodes;
1047
1048         spin_unlock(&sdp->sd_statfs_spin);
1049
1050         if (sc->sc_free < 0)
1051                 sc->sc_free = 0;
1052         if (sc->sc_free > sc->sc_total)
1053                 sc->sc_free = sc->sc_total;
1054         if (sc->sc_dinodes < 0)
1055                 sc->sc_dinodes = 0;
1056
1057         return 0;
1058 }
1059
1060 /**
1061  * gfs2_statfs - Gather and return stats about the filesystem
1062  * @sb: The superblock
1063  * @statfsbuf: The buffer
1064  *
1065  * Returns: 0 on success or error code
1066  */
1067
1068 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1069 {
1070         struct super_block *sb = dentry->d_inode->i_sb;
1071         struct gfs2_sbd *sdp = sb->s_fs_info;
1072         struct gfs2_statfs_change_host sc;
1073         int error;
1074
1075         if (gfs2_tune_get(sdp, gt_statfs_slow))
1076                 error = gfs2_statfs_slow(sdp, &sc);
1077         else
1078                 error = gfs2_statfs_i(sdp, &sc);
1079
1080         if (error)
1081                 return error;
1082
1083         buf->f_type = GFS2_MAGIC;
1084         buf->f_bsize = sdp->sd_sb.sb_bsize;
1085         buf->f_blocks = sc.sc_total;
1086         buf->f_bfree = sc.sc_free;
1087         buf->f_bavail = sc.sc_free;
1088         buf->f_files = sc.sc_dinodes + sc.sc_free;
1089         buf->f_ffree = sc.sc_free;
1090         buf->f_namelen = GFS2_FNAMESIZE;
1091
1092         return 0;
1093 }
1094
1095 /**
1096  * gfs2_remount_fs - called when the FS is remounted
1097  * @sb:  the filesystem
1098  * @flags:  the remount flags
1099  * @data:  extra data passed in (not used right now)
1100  *
1101  * Returns: errno
1102  */
1103
1104 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1105 {
1106         struct gfs2_sbd *sdp = sb->s_fs_info;
1107         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1108         struct gfs2_tune *gt = &sdp->sd_tune;
1109         int error;
1110
1111         spin_lock(&gt->gt_spin);
1112         args.ar_commit = gt->gt_logd_secs;
1113         args.ar_quota_quantum = gt->gt_quota_quantum;
1114         if (gt->gt_statfs_slow)
1115                 args.ar_statfs_quantum = 0;
1116         else
1117                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1118         spin_unlock(&gt->gt_spin);
1119         error = gfs2_mount_args(&args, data);
1120         if (error)
1121                 return error;
1122
1123         /* Not allowed to change locking details */
1124         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1125             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1126             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1127                 return -EINVAL;
1128
1129         /* Some flags must not be changed */
1130         if (args_neq(&args, &sdp->sd_args, spectator) ||
1131             args_neq(&args, &sdp->sd_args, localflocks) ||
1132             args_neq(&args, &sdp->sd_args, meta))
1133                 return -EINVAL;
1134
1135         if (sdp->sd_args.ar_spectator)
1136                 *flags |= MS_RDONLY;
1137
1138         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1139                 if (*flags & MS_RDONLY)
1140                         error = gfs2_make_fs_ro(sdp);
1141                 else
1142                         error = gfs2_make_fs_rw(sdp);
1143                 if (error)
1144                         return error;
1145         }
1146
1147         sdp->sd_args = args;
1148         if (sdp->sd_args.ar_posix_acl)
1149                 sb->s_flags |= MS_POSIXACL;
1150         else
1151                 sb->s_flags &= ~MS_POSIXACL;
1152         if (sdp->sd_args.ar_nobarrier)
1153                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1154         else
1155                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1156         spin_lock(&gt->gt_spin);
1157         gt->gt_logd_secs = args.ar_commit;
1158         gt->gt_quota_quantum = args.ar_quota_quantum;
1159         if (args.ar_statfs_quantum) {
1160                 gt->gt_statfs_slow = 0;
1161                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1162         }
1163         else {
1164                 gt->gt_statfs_slow = 1;
1165                 gt->gt_statfs_quantum = 30;
1166         }
1167         spin_unlock(&gt->gt_spin);
1168
1169         gfs2_online_uevent(sdp);
1170         return 0;
1171 }
1172
1173 /**
1174  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1175  * @inode: The inode to drop
1176  *
1177  * If we've received a callback on an iopen lock then its because a
1178  * remote node tried to deallocate the inode but failed due to this node
1179  * still having the inode open. Here we mark the link count zero
1180  * since we know that it must have reached zero if the GLF_DEMOTE flag
1181  * is set on the iopen glock. If we didn't do a disk read since the
1182  * remote node removed the final link then we might otherwise miss
1183  * this event. This check ensures that this node will deallocate the
1184  * inode's blocks, or alternatively pass the baton on to another
1185  * node for later deallocation.
1186  */
1187
1188 static int gfs2_drop_inode(struct inode *inode)
1189 {
1190         struct gfs2_inode *ip = GFS2_I(inode);
1191
1192         if (inode->i_nlink) {
1193                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1194                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1195                         clear_nlink(inode);
1196         }
1197         return generic_drop_inode(inode);
1198 }
1199
1200 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1201 {
1202         do {
1203                 if (d1 == d2)
1204                         return 1;
1205                 d1 = d1->d_parent;
1206         } while (!IS_ROOT(d1));
1207         return 0;
1208 }
1209
1210 /**
1211  * gfs2_show_options - Show mount options for /proc/mounts
1212  * @s: seq_file structure
1213  * @mnt: vfsmount
1214  *
1215  * Returns: 0 on success or error code
1216  */
1217
1218 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1219 {
1220         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1221         struct gfs2_args *args = &sdp->sd_args;
1222         int val;
1223
1224         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1225                 seq_printf(s, ",meta");
1226         if (args->ar_lockproto[0])
1227                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1228         if (args->ar_locktable[0])
1229                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1230         if (args->ar_hostdata[0])
1231                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1232         if (args->ar_spectator)
1233                 seq_printf(s, ",spectator");
1234         if (args->ar_localflocks)
1235                 seq_printf(s, ",localflocks");
1236         if (args->ar_debug)
1237                 seq_printf(s, ",debug");
1238         if (args->ar_posix_acl)
1239                 seq_printf(s, ",acl");
1240         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1241                 char *state;
1242                 switch (args->ar_quota) {
1243                 case GFS2_QUOTA_OFF:
1244                         state = "off";
1245                         break;
1246                 case GFS2_QUOTA_ACCOUNT:
1247                         state = "account";
1248                         break;
1249                 case GFS2_QUOTA_ON:
1250                         state = "on";
1251                         break;
1252                 default:
1253                         state = "unknown";
1254                         break;
1255                 }
1256                 seq_printf(s, ",quota=%s", state);
1257         }
1258         if (args->ar_suiddir)
1259                 seq_printf(s, ",suiddir");
1260         if (args->ar_data != GFS2_DATA_DEFAULT) {
1261                 char *state;
1262                 switch (args->ar_data) {
1263                 case GFS2_DATA_WRITEBACK:
1264                         state = "writeback";
1265                         break;
1266                 case GFS2_DATA_ORDERED:
1267                         state = "ordered";
1268                         break;
1269                 default:
1270                         state = "unknown";
1271                         break;
1272                 }
1273                 seq_printf(s, ",data=%s", state);
1274         }
1275         if (args->ar_discard)
1276                 seq_printf(s, ",discard");
1277         val = sdp->sd_tune.gt_logd_secs;
1278         if (val != 30)
1279                 seq_printf(s, ",commit=%d", val);
1280         val = sdp->sd_tune.gt_statfs_quantum;
1281         if (val != 30)
1282                 seq_printf(s, ",statfs_quantum=%d", val);
1283         val = sdp->sd_tune.gt_quota_quantum;
1284         if (val != 60)
1285                 seq_printf(s, ",quota_quantum=%d", val);
1286         if (args->ar_statfs_percent)
1287                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1288         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1289                 const char *state;
1290
1291                 switch (args->ar_errors) {
1292                 case GFS2_ERRORS_WITHDRAW:
1293                         state = "withdraw";
1294                         break;
1295                 case GFS2_ERRORS_PANIC:
1296                         state = "panic";
1297                         break;
1298                 default:
1299                         state = "unknown";
1300                         break;
1301                 }
1302                 seq_printf(s, ",errors=%s", state);
1303         }
1304         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1305                 seq_printf(s, ",nobarrier");
1306         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1307                 seq_printf(s, ",demote_interface_used");
1308         return 0;
1309 }
1310
1311 /*
1312  * We have to (at the moment) hold the inodes main lock to cover
1313  * the gap between unlocking the shared lock on the iopen lock and
1314  * taking the exclusive lock. I'd rather do a shared -> exclusive
1315  * conversion on the iopen lock, but we can change that later. This
1316  * is safe, just less efficient.
1317  */
1318
1319 static void gfs2_evict_inode(struct inode *inode)
1320 {
1321         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1322         struct gfs2_inode *ip = GFS2_I(inode);
1323         struct gfs2_holder gh;
1324         int error;
1325
1326         if (inode->i_nlink)
1327                 goto out;
1328
1329         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1330         if (unlikely(error)) {
1331                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1332                 goto out;
1333         }
1334
1335         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1336         if (error)
1337                 goto out_truncate;
1338
1339         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1340         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1341         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1342         error = gfs2_glock_nq(&ip->i_iopen_gh);
1343         if (error)
1344                 goto out_truncate;
1345
1346         if (S_ISDIR(inode->i_mode) &&
1347             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1348                 error = gfs2_dir_exhash_dealloc(ip);
1349                 if (error)
1350                         goto out_unlock;
1351         }
1352
1353         if (ip->i_eattr) {
1354                 error = gfs2_ea_dealloc(ip);
1355                 if (error)
1356                         goto out_unlock;
1357         }
1358
1359         if (!gfs2_is_stuffed(ip)) {
1360                 error = gfs2_file_dealloc(ip);
1361                 if (error)
1362                         goto out_unlock;
1363         }
1364
1365         error = gfs2_dinode_dealloc(ip);
1366         if (error)
1367                 goto out_unlock;
1368
1369 out_truncate:
1370         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1371         if (error)
1372                 goto out_unlock;
1373         /* Needs to be done before glock release & also in a transaction */
1374         truncate_inode_pages(&inode->i_data, 0);
1375         gfs2_trans_end(sdp);
1376
1377 out_unlock:
1378         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1379                 gfs2_glock_dq(&ip->i_iopen_gh);
1380         gfs2_holder_uninit(&ip->i_iopen_gh);
1381         gfs2_glock_dq_uninit(&gh);
1382         if (error && error != GLR_TRYFAILED && error != -EROFS)
1383                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1384 out:
1385         truncate_inode_pages(&inode->i_data, 0);
1386         end_writeback(inode);
1387
1388         ip->i_gl->gl_object = NULL;
1389         gfs2_glock_put(ip->i_gl);
1390         ip->i_gl = NULL;
1391         if (ip->i_iopen_gh.gh_gl) {
1392                 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1393                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1394         }
1395 }
1396
1397 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1398 {
1399         struct gfs2_inode *ip;
1400
1401         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1402         if (ip) {
1403                 ip->i_flags = 0;
1404                 ip->i_gl = NULL;
1405         }
1406         return &ip->i_inode;
1407 }
1408
1409 static void gfs2_i_callback(struct rcu_head *head)
1410 {
1411         struct inode *inode = container_of(head, struct inode, i_rcu);
1412         INIT_LIST_HEAD(&inode->i_dentry);
1413         kmem_cache_free(gfs2_inode_cachep, inode);
1414 }
1415
1416 static void gfs2_destroy_inode(struct inode *inode)
1417 {
1418         call_rcu(&inode->i_rcu, gfs2_i_callback);
1419 }
1420
1421 const struct super_operations gfs2_super_ops = {
1422         .alloc_inode            = gfs2_alloc_inode,
1423         .destroy_inode          = gfs2_destroy_inode,
1424         .write_inode            = gfs2_write_inode,
1425         .evict_inode            = gfs2_evict_inode,
1426         .put_super              = gfs2_put_super,
1427         .sync_fs                = gfs2_sync_fs,
1428         .freeze_fs              = gfs2_freeze,
1429         .unfreeze_fs            = gfs2_unfreeze,
1430         .statfs                 = gfs2_statfs,
1431         .remount_fs             = gfs2_remount_fs,
1432         .drop_inode             = gfs2_drop_inode,
1433         .show_options           = gfs2_show_options,
1434 };
1435