c282ad41f3d1860bba4301495a7303de40b57d06
[linux-2.6.git] / fs / gfs2 / super.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "log.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "recovery.h"
36 #include "rgrp.h"
37 #include "super.h"
38 #include "trans.h"
39 #include "util.h"
40 #include "sys.h"
41 #include "xattr.h"
42
43 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
44
45 enum {
46         Opt_lockproto,
47         Opt_locktable,
48         Opt_hostdata,
49         Opt_spectator,
50         Opt_ignore_local_fs,
51         Opt_localflocks,
52         Opt_localcaching,
53         Opt_debug,
54         Opt_nodebug,
55         Opt_upgrade,
56         Opt_acl,
57         Opt_noacl,
58         Opt_quota_off,
59         Opt_quota_account,
60         Opt_quota_on,
61         Opt_quota,
62         Opt_noquota,
63         Opt_suiddir,
64         Opt_nosuiddir,
65         Opt_data_writeback,
66         Opt_data_ordered,
67         Opt_meta,
68         Opt_discard,
69         Opt_nodiscard,
70         Opt_commit,
71         Opt_err_withdraw,
72         Opt_err_panic,
73         Opt_statfs_quantum,
74         Opt_statfs_percent,
75         Opt_quota_quantum,
76         Opt_barrier,
77         Opt_nobarrier,
78         Opt_error,
79 };
80
81 static const match_table_t tokens = {
82         {Opt_lockproto, "lockproto=%s"},
83         {Opt_locktable, "locktable=%s"},
84         {Opt_hostdata, "hostdata=%s"},
85         {Opt_spectator, "spectator"},
86         {Opt_ignore_local_fs, "ignore_local_fs"},
87         {Opt_localflocks, "localflocks"},
88         {Opt_localcaching, "localcaching"},
89         {Opt_debug, "debug"},
90         {Opt_nodebug, "nodebug"},
91         {Opt_upgrade, "upgrade"},
92         {Opt_acl, "acl"},
93         {Opt_noacl, "noacl"},
94         {Opt_quota_off, "quota=off"},
95         {Opt_quota_account, "quota=account"},
96         {Opt_quota_on, "quota=on"},
97         {Opt_quota, "quota"},
98         {Opt_noquota, "noquota"},
99         {Opt_suiddir, "suiddir"},
100         {Opt_nosuiddir, "nosuiddir"},
101         {Opt_data_writeback, "data=writeback"},
102         {Opt_data_ordered, "data=ordered"},
103         {Opt_meta, "meta"},
104         {Opt_discard, "discard"},
105         {Opt_nodiscard, "nodiscard"},
106         {Opt_commit, "commit=%d"},
107         {Opt_err_withdraw, "errors=withdraw"},
108         {Opt_err_panic, "errors=panic"},
109         {Opt_statfs_quantum, "statfs_quantum=%d"},
110         {Opt_statfs_percent, "statfs_percent=%d"},
111         {Opt_quota_quantum, "quota_quantum=%d"},
112         {Opt_barrier, "barrier"},
113         {Opt_nobarrier, "nobarrier"},
114         {Opt_error, NULL}
115 };
116
117 /**
118  * gfs2_mount_args - Parse mount options
119  * @args: The structure into which the parsed options will be written
120  * @options: The options to parse
121  *
122  * Return: errno
123  */
124
125 int gfs2_mount_args(struct gfs2_args *args, char *options)
126 {
127         char *o;
128         int token;
129         substring_t tmp[MAX_OPT_ARGS];
130         int rv;
131
132         /* Split the options into tokens with the "," character and
133            process them */
134
135         while (1) {
136                 o = strsep(&options, ",");
137                 if (o == NULL)
138                         break;
139                 if (*o == '\0')
140                         continue;
141
142                 token = match_token(o, tokens, tmp);
143                 switch (token) {
144                 case Opt_lockproto:
145                         match_strlcpy(args->ar_lockproto, &tmp[0],
146                                       GFS2_LOCKNAME_LEN);
147                         break;
148                 case Opt_locktable:
149                         match_strlcpy(args->ar_locktable, &tmp[0],
150                                       GFS2_LOCKNAME_LEN);
151                         break;
152                 case Opt_hostdata:
153                         match_strlcpy(args->ar_hostdata, &tmp[0],
154                                       GFS2_LOCKNAME_LEN);
155                         break;
156                 case Opt_spectator:
157                         args->ar_spectator = 1;
158                         break;
159                 case Opt_ignore_local_fs:
160                         args->ar_ignore_local_fs = 1;
161                         break;
162                 case Opt_localflocks:
163                         args->ar_localflocks = 1;
164                         break;
165                 case Opt_localcaching:
166                         args->ar_localcaching = 1;
167                         break;
168                 case Opt_debug:
169                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
170                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
171                                        "are mutually exclusive.\n");
172                                 return -EINVAL;
173                         }
174                         args->ar_debug = 1;
175                         break;
176                 case Opt_nodebug:
177                         args->ar_debug = 0;
178                         break;
179                 case Opt_upgrade:
180                         args->ar_upgrade = 1;
181                         break;
182                 case Opt_acl:
183                         args->ar_posix_acl = 1;
184                         break;
185                 case Opt_noacl:
186                         args->ar_posix_acl = 0;
187                         break;
188                 case Opt_quota_off:
189                 case Opt_noquota:
190                         args->ar_quota = GFS2_QUOTA_OFF;
191                         break;
192                 case Opt_quota_account:
193                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
194                         break;
195                 case Opt_quota_on:
196                 case Opt_quota:
197                         args->ar_quota = GFS2_QUOTA_ON;
198                         break;
199                 case Opt_suiddir:
200                         args->ar_suiddir = 1;
201                         break;
202                 case Opt_nosuiddir:
203                         args->ar_suiddir = 0;
204                         break;
205                 case Opt_data_writeback:
206                         args->ar_data = GFS2_DATA_WRITEBACK;
207                         break;
208                 case Opt_data_ordered:
209                         args->ar_data = GFS2_DATA_ORDERED;
210                         break;
211                 case Opt_meta:
212                         args->ar_meta = 1;
213                         break;
214                 case Opt_discard:
215                         args->ar_discard = 1;
216                         break;
217                 case Opt_nodiscard:
218                         args->ar_discard = 0;
219                         break;
220                 case Opt_commit:
221                         rv = match_int(&tmp[0], &args->ar_commit);
222                         if (rv || args->ar_commit <= 0) {
223                                 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
224                                 return rv ? rv : -EINVAL;
225                         }
226                         break;
227                 case Opt_statfs_quantum:
228                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
229                         if (rv || args->ar_statfs_quantum < 0) {
230                                 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
231                                 return rv ? rv : -EINVAL;
232                         }
233                         break;
234                 case Opt_quota_quantum:
235                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
236                         if (rv || args->ar_quota_quantum <= 0) {
237                                 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
238                                 return rv ? rv : -EINVAL;
239                         }
240                         break;
241                 case Opt_statfs_percent:
242                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
243                         if (rv || args->ar_statfs_percent < 0 ||
244                             args->ar_statfs_percent > 100) {
245                                 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
246                                 return rv ? rv : -EINVAL;
247                         }
248                         break;
249                 case Opt_err_withdraw:
250                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
251                         break;
252                 case Opt_err_panic:
253                         if (args->ar_debug) {
254                                 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
255                                         "are mutually exclusive.\n");
256                                 return -EINVAL;
257                         }
258                         args->ar_errors = GFS2_ERRORS_PANIC;
259                         break;
260                 case Opt_barrier:
261                         args->ar_nobarrier = 0;
262                         break;
263                 case Opt_nobarrier:
264                         args->ar_nobarrier = 1;
265                         break;
266                 case Opt_error:
267                 default:
268                         printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
269                         return -EINVAL;
270                 }
271         }
272
273         return 0;
274 }
275
276 /**
277  * gfs2_jindex_free - Clear all the journal index information
278  * @sdp: The GFS2 superblock
279  *
280  */
281
282 void gfs2_jindex_free(struct gfs2_sbd *sdp)
283 {
284         struct list_head list, *head;
285         struct gfs2_jdesc *jd;
286         struct gfs2_journal_extent *jext;
287
288         spin_lock(&sdp->sd_jindex_spin);
289         list_add(&list, &sdp->sd_jindex_list);
290         list_del_init(&sdp->sd_jindex_list);
291         sdp->sd_journals = 0;
292         spin_unlock(&sdp->sd_jindex_spin);
293
294         while (!list_empty(&list)) {
295                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
296                 head = &jd->extent_list;
297                 while (!list_empty(head)) {
298                         jext = list_entry(head->next,
299                                           struct gfs2_journal_extent,
300                                           extent_list);
301                         list_del(&jext->extent_list);
302                         kfree(jext);
303                 }
304                 list_del(&jd->jd_list);
305                 iput(jd->jd_inode);
306                 kfree(jd);
307         }
308 }
309
310 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
311 {
312         struct gfs2_jdesc *jd;
313         int found = 0;
314
315         list_for_each_entry(jd, head, jd_list) {
316                 if (jd->jd_jid == jid) {
317                         found = 1;
318                         break;
319                 }
320         }
321
322         if (!found)
323                 jd = NULL;
324
325         return jd;
326 }
327
328 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
329 {
330         struct gfs2_jdesc *jd;
331
332         spin_lock(&sdp->sd_jindex_spin);
333         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
334         spin_unlock(&sdp->sd_jindex_spin);
335
336         return jd;
337 }
338
339 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
340 {
341         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
342         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
343         int ar;
344         int error;
345
346         if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
347             (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
348                 gfs2_consist_inode(ip);
349                 return -EIO;
350         }
351         jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
352
353         error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
354         if (!error && ar) {
355                 gfs2_consist_inode(ip);
356                 error = -EIO;
357         }
358
359         return error;
360 }
361
362 /**
363  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
364  * @sdp: the filesystem
365  *
366  * Returns: errno
367  */
368
369 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
370 {
371         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
372         struct gfs2_glock *j_gl = ip->i_gl;
373         struct gfs2_holder t_gh;
374         struct gfs2_log_header_host head;
375         int error;
376
377         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
378         if (error)
379                 return error;
380
381         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
382
383         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
384         if (error)
385                 goto fail;
386
387         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
388                 gfs2_consist(sdp);
389                 error = -EIO;
390                 goto fail;
391         }
392
393         /*  Initialize some head of the log stuff  */
394         sdp->sd_log_sequence = head.lh_sequence + 1;
395         gfs2_log_pointers_init(sdp, head.lh_blkno);
396
397         error = gfs2_quota_init(sdp);
398         if (error)
399                 goto fail;
400
401         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
402
403         gfs2_glock_dq_uninit(&t_gh);
404
405         return 0;
406
407 fail:
408         t_gh.gh_flags |= GL_NOCACHE;
409         gfs2_glock_dq_uninit(&t_gh);
410
411         return error;
412 }
413
414 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
415 {
416         const struct gfs2_statfs_change *str = buf;
417
418         sc->sc_total = be64_to_cpu(str->sc_total);
419         sc->sc_free = be64_to_cpu(str->sc_free);
420         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
421 }
422
423 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
424 {
425         struct gfs2_statfs_change *str = buf;
426
427         str->sc_total = cpu_to_be64(sc->sc_total);
428         str->sc_free = cpu_to_be64(sc->sc_free);
429         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
430 }
431
432 int gfs2_statfs_init(struct gfs2_sbd *sdp)
433 {
434         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
435         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
436         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
437         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
438         struct buffer_head *m_bh, *l_bh;
439         struct gfs2_holder gh;
440         int error;
441
442         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
443                                    &gh);
444         if (error)
445                 return error;
446
447         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
448         if (error)
449                 goto out;
450
451         if (sdp->sd_args.ar_spectator) {
452                 spin_lock(&sdp->sd_statfs_spin);
453                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
454                                       sizeof(struct gfs2_dinode));
455                 spin_unlock(&sdp->sd_statfs_spin);
456         } else {
457                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
458                 if (error)
459                         goto out_m_bh;
460
461                 spin_lock(&sdp->sd_statfs_spin);
462                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
463                                       sizeof(struct gfs2_dinode));
464                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
465                                       sizeof(struct gfs2_dinode));
466                 spin_unlock(&sdp->sd_statfs_spin);
467
468                 brelse(l_bh);
469         }
470
471 out_m_bh:
472         brelse(m_bh);
473 out:
474         gfs2_glock_dq_uninit(&gh);
475         return 0;
476 }
477
478 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
479                         s64 dinodes)
480 {
481         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
482         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
483         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
484         struct buffer_head *l_bh;
485         s64 x, y;
486         int need_sync = 0;
487         int error;
488
489         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
490         if (error)
491                 return;
492
493         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
494
495         spin_lock(&sdp->sd_statfs_spin);
496         l_sc->sc_total += total;
497         l_sc->sc_free += free;
498         l_sc->sc_dinodes += dinodes;
499         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
500         if (sdp->sd_args.ar_statfs_percent) {
501                 x = 100 * l_sc->sc_free;
502                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
503                 if (x >= y || x <= -y)
504                         need_sync = 1;
505         }
506         spin_unlock(&sdp->sd_statfs_spin);
507
508         brelse(l_bh);
509         if (need_sync)
510                 gfs2_wake_up_statfs(sdp);
511 }
512
513 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
514                    struct buffer_head *l_bh)
515 {
516         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
517         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
518         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
519         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
520
521         gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
522
523         spin_lock(&sdp->sd_statfs_spin);
524         m_sc->sc_total += l_sc->sc_total;
525         m_sc->sc_free += l_sc->sc_free;
526         m_sc->sc_dinodes += l_sc->sc_dinodes;
527         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
528         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
529                0, sizeof(struct gfs2_statfs_change));
530         spin_unlock(&sdp->sd_statfs_spin);
531
532         gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
533         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
534 }
535
536 int gfs2_statfs_sync(struct super_block *sb, int type)
537 {
538         struct gfs2_sbd *sdp = sb->s_fs_info;
539         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
540         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
541         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
542         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
543         struct gfs2_holder gh;
544         struct buffer_head *m_bh, *l_bh;
545         int error;
546
547         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
548                                    &gh);
549         if (error)
550                 return error;
551
552         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
553         if (error)
554                 goto out;
555
556         spin_lock(&sdp->sd_statfs_spin);
557         gfs2_statfs_change_in(m_sc, m_bh->b_data +
558                               sizeof(struct gfs2_dinode));
559         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
560                 spin_unlock(&sdp->sd_statfs_spin);
561                 goto out_bh;
562         }
563         spin_unlock(&sdp->sd_statfs_spin);
564
565         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
566         if (error)
567                 goto out_bh;
568
569         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
570         if (error)
571                 goto out_bh2;
572
573         update_statfs(sdp, m_bh, l_bh);
574         sdp->sd_statfs_force_sync = 0;
575
576         gfs2_trans_end(sdp);
577
578 out_bh2:
579         brelse(l_bh);
580 out_bh:
581         brelse(m_bh);
582 out:
583         gfs2_glock_dq_uninit(&gh);
584         return error;
585 }
586
587 struct lfcc {
588         struct list_head list;
589         struct gfs2_holder gh;
590 };
591
592 /**
593  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
594  *                            journals are clean
595  * @sdp: the file system
596  * @state: the state to put the transaction lock into
597  * @t_gh: the hold on the transaction lock
598  *
599  * Returns: errno
600  */
601
602 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
603                                     struct gfs2_holder *t_gh)
604 {
605         struct gfs2_inode *ip;
606         struct gfs2_jdesc *jd;
607         struct lfcc *lfcc;
608         LIST_HEAD(list);
609         struct gfs2_log_header_host lh;
610         int error;
611
612         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
613                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
614                 if (!lfcc) {
615                         error = -ENOMEM;
616                         goto out;
617                 }
618                 ip = GFS2_I(jd->jd_inode);
619                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
620                 if (error) {
621                         kfree(lfcc);
622                         goto out;
623                 }
624                 list_add(&lfcc->list, &list);
625         }
626
627         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
628                                    GL_NOCACHE, t_gh);
629
630         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
631                 error = gfs2_jdesc_check(jd);
632                 if (error)
633                         break;
634                 error = gfs2_find_jhead(jd, &lh);
635                 if (error)
636                         break;
637                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
638                         error = -EBUSY;
639                         break;
640                 }
641         }
642
643         if (error)
644                 gfs2_glock_dq_uninit(t_gh);
645
646 out:
647         while (!list_empty(&list)) {
648                 lfcc = list_entry(list.next, struct lfcc, list);
649                 list_del(&lfcc->list);
650                 gfs2_glock_dq_uninit(&lfcc->gh);
651                 kfree(lfcc);
652         }
653         return error;
654 }
655
656 /**
657  * gfs2_freeze_fs - freezes the file system
658  * @sdp: the file system
659  *
660  * This function flushes data and meta data for all machines by
661  * aquiring the transaction log exclusively.  All journals are
662  * ensured to be in a clean state as well.
663  *
664  * Returns: errno
665  */
666
667 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
668 {
669         int error = 0;
670
671         mutex_lock(&sdp->sd_freeze_lock);
672
673         if (!sdp->sd_freeze_count++) {
674                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
675                 if (error)
676                         sdp->sd_freeze_count--;
677         }
678
679         mutex_unlock(&sdp->sd_freeze_lock);
680
681         return error;
682 }
683
684 /**
685  * gfs2_unfreeze_fs - unfreezes the file system
686  * @sdp: the file system
687  *
688  * This function allows the file system to proceed by unlocking
689  * the exclusively held transaction lock.  Other GFS2 nodes are
690  * now free to acquire the lock shared and go on with their lives.
691  *
692  */
693
694 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
695 {
696         mutex_lock(&sdp->sd_freeze_lock);
697
698         if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
699                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
700
701         mutex_unlock(&sdp->sd_freeze_lock);
702 }
703
704
705 /**
706  * gfs2_write_inode - Make sure the inode is stable on the disk
707  * @inode: The inode
708  * @sync: synchronous write flag
709  *
710  * Returns: errno
711  */
712
713 static int gfs2_write_inode(struct inode *inode, int sync)
714 {
715         struct gfs2_inode *ip = GFS2_I(inode);
716         struct gfs2_sbd *sdp = GFS2_SB(inode);
717         struct gfs2_holder gh;
718         struct buffer_head *bh;
719         struct timespec atime;
720         struct gfs2_dinode *di;
721         int ret = 0;
722
723         /* Check this is a "normal" inode, etc */
724         if (!test_bit(GIF_USER, &ip->i_flags) ||
725             (current->flags & PF_MEMALLOC))
726                 return 0;
727         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
728         if (ret)
729                 goto do_flush;
730         ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
731         if (ret)
732                 goto do_unlock;
733         ret = gfs2_meta_inode_buffer(ip, &bh);
734         if (ret == 0) {
735                 di = (struct gfs2_dinode *)bh->b_data;
736                 atime.tv_sec = be64_to_cpu(di->di_atime);
737                 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
738                 if (timespec_compare(&inode->i_atime, &atime) > 0) {
739                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
740                         gfs2_dinode_out(ip, bh->b_data);
741                 }
742                 brelse(bh);
743         }
744         gfs2_trans_end(sdp);
745 do_unlock:
746         gfs2_glock_dq_uninit(&gh);
747 do_flush:
748         if (sync != 0)
749                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
750         return ret;
751 }
752
753 /**
754  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
755  * @sdp: the filesystem
756  *
757  * Returns: errno
758  */
759
760 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
761 {
762         struct gfs2_holder t_gh;
763         int error;
764
765         flush_workqueue(gfs2_delete_workqueue);
766         gfs2_quota_sync(sdp->sd_vfs, 0);
767         gfs2_statfs_sync(sdp->sd_vfs, 0);
768
769         error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
770                                    &t_gh);
771         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
772                 return error;
773
774         gfs2_meta_syncfs(sdp);
775         gfs2_log_shutdown(sdp);
776
777         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
778
779         if (t_gh.gh_gl)
780                 gfs2_glock_dq_uninit(&t_gh);
781
782         gfs2_quota_cleanup(sdp);
783
784         return error;
785 }
786
787 static int gfs2_umount_recovery_wait(void *word)
788 {
789         schedule();
790         return 0;
791 }
792
793 /**
794  * gfs2_put_super - Unmount the filesystem
795  * @sb: The VFS superblock
796  *
797  */
798
799 static void gfs2_put_super(struct super_block *sb)
800 {
801         struct gfs2_sbd *sdp = sb->s_fs_info;
802         int error;
803         struct gfs2_jdesc *jd;
804
805         /*  Unfreeze the filesystem, if we need to  */
806
807         mutex_lock(&sdp->sd_freeze_lock);
808         if (sdp->sd_freeze_count)
809                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
810         mutex_unlock(&sdp->sd_freeze_lock);
811
812         /* No more recovery requests */
813         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
814         smp_mb();
815
816         /* Wait on outstanding recovery */
817 restart:
818         spin_lock(&sdp->sd_jindex_spin);
819         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
820                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
821                         continue;
822                 spin_unlock(&sdp->sd_jindex_spin);
823                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
824                             gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
825                 goto restart;
826         }
827         spin_unlock(&sdp->sd_jindex_spin);
828
829         kthread_stop(sdp->sd_quotad_process);
830         kthread_stop(sdp->sd_logd_process);
831
832         if (!(sb->s_flags & MS_RDONLY)) {
833                 error = gfs2_make_fs_ro(sdp);
834                 if (error)
835                         gfs2_io_error(sdp);
836         }
837         /*  At this point, we're through modifying the disk  */
838
839         /*  Release stuff  */
840
841         iput(sdp->sd_jindex);
842         iput(sdp->sd_statfs_inode);
843         iput(sdp->sd_rindex);
844         iput(sdp->sd_quota_inode);
845
846         gfs2_glock_put(sdp->sd_rename_gl);
847         gfs2_glock_put(sdp->sd_trans_gl);
848
849         if (!sdp->sd_args.ar_spectator) {
850                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
851                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
852                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
853                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
854                 iput(sdp->sd_sc_inode);
855                 iput(sdp->sd_qc_inode);
856         }
857
858         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
859         gfs2_clear_rgrpd(sdp);
860         gfs2_jindex_free(sdp);
861         /*  Take apart glock structures and buffer lists  */
862         gfs2_gl_hash_clear(sdp);
863         /*  Unmount the locking protocol  */
864         gfs2_lm_unmount(sdp);
865
866         /*  At this point, we're through participating in the lockspace  */
867         gfs2_sys_fs_del(sdp);
868 }
869
870 /**
871  * gfs2_sync_fs - sync the filesystem
872  * @sb: the superblock
873  *
874  * Flushes the log to disk.
875  */
876
877 static int gfs2_sync_fs(struct super_block *sb, int wait)
878 {
879         if (wait && sb->s_fs_info)
880                 gfs2_log_flush(sb->s_fs_info, NULL);
881         return 0;
882 }
883
884 /**
885  * gfs2_freeze - prevent further writes to the filesystem
886  * @sb: the VFS structure for the filesystem
887  *
888  */
889
890 static int gfs2_freeze(struct super_block *sb)
891 {
892         struct gfs2_sbd *sdp = sb->s_fs_info;
893         int error;
894
895         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
896                 return -EINVAL;
897
898         for (;;) {
899                 error = gfs2_freeze_fs(sdp);
900                 if (!error)
901                         break;
902
903                 switch (error) {
904                 case -EBUSY:
905                         fs_err(sdp, "waiting for recovery before freeze\n");
906                         break;
907
908                 default:
909                         fs_err(sdp, "error freezing FS: %d\n", error);
910                         break;
911                 }
912
913                 fs_err(sdp, "retrying...\n");
914                 msleep(1000);
915         }
916         return 0;
917 }
918
919 /**
920  * gfs2_unfreeze - reallow writes to the filesystem
921  * @sb: the VFS structure for the filesystem
922  *
923  */
924
925 static int gfs2_unfreeze(struct super_block *sb)
926 {
927         gfs2_unfreeze_fs(sb->s_fs_info);
928         return 0;
929 }
930
931 /**
932  * statfs_fill - fill in the sg for a given RG
933  * @rgd: the RG
934  * @sc: the sc structure
935  *
936  * Returns: 0 on success, -ESTALE if the LVB is invalid
937  */
938
939 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
940                             struct gfs2_statfs_change_host *sc)
941 {
942         gfs2_rgrp_verify(rgd);
943         sc->sc_total += rgd->rd_data;
944         sc->sc_free += rgd->rd_free;
945         sc->sc_dinodes += rgd->rd_dinodes;
946         return 0;
947 }
948
949 /**
950  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
951  * @sdp: the filesystem
952  * @sc: the sc info that will be returned
953  *
954  * Any error (other than a signal) will cause this routine to fall back
955  * to the synchronous version.
956  *
957  * FIXME: This really shouldn't busy wait like this.
958  *
959  * Returns: errno
960  */
961
962 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
963 {
964         struct gfs2_holder ri_gh;
965         struct gfs2_rgrpd *rgd_next;
966         struct gfs2_holder *gha, *gh;
967         unsigned int slots = 64;
968         unsigned int x;
969         int done;
970         int error = 0, err;
971
972         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
973         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
974         if (!gha)
975                 return -ENOMEM;
976
977         error = gfs2_rindex_hold(sdp, &ri_gh);
978         if (error)
979                 goto out;
980
981         rgd_next = gfs2_rgrpd_get_first(sdp);
982
983         for (;;) {
984                 done = 1;
985
986                 for (x = 0; x < slots; x++) {
987                         gh = gha + x;
988
989                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
990                                 err = gfs2_glock_wait(gh);
991                                 if (err) {
992                                         gfs2_holder_uninit(gh);
993                                         error = err;
994                                 } else {
995                                         if (!error)
996                                                 error = statfs_slow_fill(
997                                                         gh->gh_gl->gl_object, sc);
998                                         gfs2_glock_dq_uninit(gh);
999                                 }
1000                         }
1001
1002                         if (gh->gh_gl)
1003                                 done = 0;
1004                         else if (rgd_next && !error) {
1005                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1006                                                            LM_ST_SHARED,
1007                                                            GL_ASYNC,
1008                                                            gh);
1009                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1010                                 done = 0;
1011                         }
1012
1013                         if (signal_pending(current))
1014                                 error = -ERESTARTSYS;
1015                 }
1016
1017                 if (done)
1018                         break;
1019
1020                 yield();
1021         }
1022
1023         gfs2_glock_dq_uninit(&ri_gh);
1024
1025 out:
1026         kfree(gha);
1027         return error;
1028 }
1029
1030 /**
1031  * gfs2_statfs_i - Do a statfs
1032  * @sdp: the filesystem
1033  * @sg: the sg structure
1034  *
1035  * Returns: errno
1036  */
1037
1038 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1039 {
1040         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1041         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1042
1043         spin_lock(&sdp->sd_statfs_spin);
1044
1045         *sc = *m_sc;
1046         sc->sc_total += l_sc->sc_total;
1047         sc->sc_free += l_sc->sc_free;
1048         sc->sc_dinodes += l_sc->sc_dinodes;
1049
1050         spin_unlock(&sdp->sd_statfs_spin);
1051
1052         if (sc->sc_free < 0)
1053                 sc->sc_free = 0;
1054         if (sc->sc_free > sc->sc_total)
1055                 sc->sc_free = sc->sc_total;
1056         if (sc->sc_dinodes < 0)
1057                 sc->sc_dinodes = 0;
1058
1059         return 0;
1060 }
1061
1062 /**
1063  * gfs2_statfs - Gather and return stats about the filesystem
1064  * @sb: The superblock
1065  * @statfsbuf: The buffer
1066  *
1067  * Returns: 0 on success or error code
1068  */
1069
1070 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1071 {
1072         struct super_block *sb = dentry->d_inode->i_sb;
1073         struct gfs2_sbd *sdp = sb->s_fs_info;
1074         struct gfs2_statfs_change_host sc;
1075         int error;
1076
1077         if (gfs2_tune_get(sdp, gt_statfs_slow))
1078                 error = gfs2_statfs_slow(sdp, &sc);
1079         else
1080                 error = gfs2_statfs_i(sdp, &sc);
1081
1082         if (error)
1083                 return error;
1084
1085         buf->f_type = GFS2_MAGIC;
1086         buf->f_bsize = sdp->sd_sb.sb_bsize;
1087         buf->f_blocks = sc.sc_total;
1088         buf->f_bfree = sc.sc_free;
1089         buf->f_bavail = sc.sc_free;
1090         buf->f_files = sc.sc_dinodes + sc.sc_free;
1091         buf->f_ffree = sc.sc_free;
1092         buf->f_namelen = GFS2_FNAMESIZE;
1093
1094         return 0;
1095 }
1096
1097 /**
1098  * gfs2_remount_fs - called when the FS is remounted
1099  * @sb:  the filesystem
1100  * @flags:  the remount flags
1101  * @data:  extra data passed in (not used right now)
1102  *
1103  * Returns: errno
1104  */
1105
1106 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1107 {
1108         struct gfs2_sbd *sdp = sb->s_fs_info;
1109         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1110         struct gfs2_tune *gt = &sdp->sd_tune;
1111         int error;
1112
1113         spin_lock(&gt->gt_spin);
1114         args.ar_commit = gt->gt_log_flush_secs;
1115         args.ar_quota_quantum = gt->gt_quota_quantum;
1116         if (gt->gt_statfs_slow)
1117                 args.ar_statfs_quantum = 0;
1118         else
1119                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1120         spin_unlock(&gt->gt_spin);
1121         error = gfs2_mount_args(&args, data);
1122         if (error)
1123                 return error;
1124
1125         /* Not allowed to change locking details */
1126         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1127             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1128             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1129                 return -EINVAL;
1130
1131         /* Some flags must not be changed */
1132         if (args_neq(&args, &sdp->sd_args, spectator) ||
1133             args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1134             args_neq(&args, &sdp->sd_args, localflocks) ||
1135             args_neq(&args, &sdp->sd_args, localcaching) ||
1136             args_neq(&args, &sdp->sd_args, meta))
1137                 return -EINVAL;
1138
1139         if (sdp->sd_args.ar_spectator)
1140                 *flags |= MS_RDONLY;
1141
1142         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1143                 if (*flags & MS_RDONLY)
1144                         error = gfs2_make_fs_ro(sdp);
1145                 else
1146                         error = gfs2_make_fs_rw(sdp);
1147                 if (error)
1148                         return error;
1149         }
1150
1151         sdp->sd_args = args;
1152         if (sdp->sd_args.ar_posix_acl)
1153                 sb->s_flags |= MS_POSIXACL;
1154         else
1155                 sb->s_flags &= ~MS_POSIXACL;
1156         if (sdp->sd_args.ar_nobarrier)
1157                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1158         else
1159                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1160         spin_lock(&gt->gt_spin);
1161         gt->gt_log_flush_secs = args.ar_commit;
1162         gt->gt_quota_quantum = args.ar_quota_quantum;
1163         if (args.ar_statfs_quantum) {
1164                 gt->gt_statfs_slow = 0;
1165                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1166         }
1167         else {
1168                 gt->gt_statfs_slow = 1;
1169                 gt->gt_statfs_quantum = 30;
1170         }
1171         spin_unlock(&gt->gt_spin);
1172
1173         gfs2_online_uevent(sdp);
1174         return 0;
1175 }
1176
1177 /**
1178  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1179  * @inode: The inode to drop
1180  *
1181  * If we've received a callback on an iopen lock then its because a
1182  * remote node tried to deallocate the inode but failed due to this node
1183  * still having the inode open. Here we mark the link count zero
1184  * since we know that it must have reached zero if the GLF_DEMOTE flag
1185  * is set on the iopen glock. If we didn't do a disk read since the
1186  * remote node removed the final link then we might otherwise miss
1187  * this event. This check ensures that this node will deallocate the
1188  * inode's blocks, or alternatively pass the baton on to another
1189  * node for later deallocation.
1190  */
1191
1192 static void gfs2_drop_inode(struct inode *inode)
1193 {
1194         struct gfs2_inode *ip = GFS2_I(inode);
1195
1196         if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1197                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1198                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1199                         clear_nlink(inode);
1200         }
1201         generic_drop_inode(inode);
1202 }
1203
1204 /**
1205  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1206  * @inode: The VFS inode
1207  *
1208  */
1209
1210 static void gfs2_clear_inode(struct inode *inode)
1211 {
1212         struct gfs2_inode *ip = GFS2_I(inode);
1213
1214         /* This tells us its a "real" inode and not one which only
1215          * serves to contain an address space (see rgrp.c, meta_io.c)
1216          * which therefore doesn't have its own glocks.
1217          */
1218         if (test_bit(GIF_USER, &ip->i_flags)) {
1219                 ip->i_gl->gl_object = NULL;
1220                 gfs2_glock_put(ip->i_gl);
1221                 ip->i_gl = NULL;
1222                 if (ip->i_iopen_gh.gh_gl) {
1223                         ip->i_iopen_gh.gh_gl->gl_object = NULL;
1224                         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1225                 }
1226         }
1227 }
1228
1229 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1230 {
1231         do {
1232                 if (d1 == d2)
1233                         return 1;
1234                 d1 = d1->d_parent;
1235         } while (!IS_ROOT(d1));
1236         return 0;
1237 }
1238
1239 /**
1240  * gfs2_show_options - Show mount options for /proc/mounts
1241  * @s: seq_file structure
1242  * @mnt: vfsmount
1243  *
1244  * Returns: 0 on success or error code
1245  */
1246
1247 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1248 {
1249         struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1250         struct gfs2_args *args = &sdp->sd_args;
1251         int val;
1252
1253         if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1254                 seq_printf(s, ",meta");
1255         if (args->ar_lockproto[0])
1256                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1257         if (args->ar_locktable[0])
1258                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1259         if (args->ar_hostdata[0])
1260                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1261         if (args->ar_spectator)
1262                 seq_printf(s, ",spectator");
1263         if (args->ar_ignore_local_fs)
1264                 seq_printf(s, ",ignore_local_fs");
1265         if (args->ar_localflocks)
1266                 seq_printf(s, ",localflocks");
1267         if (args->ar_localcaching)
1268                 seq_printf(s, ",localcaching");
1269         if (args->ar_debug)
1270                 seq_printf(s, ",debug");
1271         if (args->ar_upgrade)
1272                 seq_printf(s, ",upgrade");
1273         if (args->ar_posix_acl)
1274                 seq_printf(s, ",acl");
1275         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1276                 char *state;
1277                 switch (args->ar_quota) {
1278                 case GFS2_QUOTA_OFF:
1279                         state = "off";
1280                         break;
1281                 case GFS2_QUOTA_ACCOUNT:
1282                         state = "account";
1283                         break;
1284                 case GFS2_QUOTA_ON:
1285                         state = "on";
1286                         break;
1287                 default:
1288                         state = "unknown";
1289                         break;
1290                 }
1291                 seq_printf(s, ",quota=%s", state);
1292         }
1293         if (args->ar_suiddir)
1294                 seq_printf(s, ",suiddir");
1295         if (args->ar_data != GFS2_DATA_DEFAULT) {
1296                 char *state;
1297                 switch (args->ar_data) {
1298                 case GFS2_DATA_WRITEBACK:
1299                         state = "writeback";
1300                         break;
1301                 case GFS2_DATA_ORDERED:
1302                         state = "ordered";
1303                         break;
1304                 default:
1305                         state = "unknown";
1306                         break;
1307                 }
1308                 seq_printf(s, ",data=%s", state);
1309         }
1310         if (args->ar_discard)
1311                 seq_printf(s, ",discard");
1312         val = sdp->sd_tune.gt_log_flush_secs;
1313         if (val != 60)
1314                 seq_printf(s, ",commit=%d", val);
1315         val = sdp->sd_tune.gt_statfs_quantum;
1316         if (val != 30)
1317                 seq_printf(s, ",statfs_quantum=%d", val);
1318         val = sdp->sd_tune.gt_quota_quantum;
1319         if (val != 60)
1320                 seq_printf(s, ",quota_quantum=%d", val);
1321         if (args->ar_statfs_percent)
1322                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1323         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1324                 const char *state;
1325
1326                 switch (args->ar_errors) {
1327                 case GFS2_ERRORS_WITHDRAW:
1328                         state = "withdraw";
1329                         break;
1330                 case GFS2_ERRORS_PANIC:
1331                         state = "panic";
1332                         break;
1333                 default:
1334                         state = "unknown";
1335                         break;
1336                 }
1337                 seq_printf(s, ",errors=%s", state);
1338         }
1339         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1340                 seq_printf(s, ",nobarrier");
1341
1342         return 0;
1343 }
1344
1345 /*
1346  * We have to (at the moment) hold the inodes main lock to cover
1347  * the gap between unlocking the shared lock on the iopen lock and
1348  * taking the exclusive lock. I'd rather do a shared -> exclusive
1349  * conversion on the iopen lock, but we can change that later. This
1350  * is safe, just less efficient.
1351  */
1352
1353 static void gfs2_delete_inode(struct inode *inode)
1354 {
1355         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1356         struct gfs2_inode *ip = GFS2_I(inode);
1357         struct gfs2_holder gh;
1358         int error;
1359
1360         if (!test_bit(GIF_USER, &ip->i_flags))
1361                 goto out;
1362
1363         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1364         if (unlikely(error)) {
1365                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1366                 goto out;
1367         }
1368
1369         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1370         if (error)
1371                 goto out_truncate;
1372
1373         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1374         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1375         error = gfs2_glock_nq(&ip->i_iopen_gh);
1376         if (error)
1377                 goto out_truncate;
1378
1379         if (S_ISDIR(inode->i_mode) &&
1380             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1381                 error = gfs2_dir_exhash_dealloc(ip);
1382                 if (error)
1383                         goto out_unlock;
1384         }
1385
1386         if (ip->i_eattr) {
1387                 error = gfs2_ea_dealloc(ip);
1388                 if (error)
1389                         goto out_unlock;
1390         }
1391
1392         if (!gfs2_is_stuffed(ip)) {
1393                 error = gfs2_file_dealloc(ip);
1394                 if (error)
1395                         goto out_unlock;
1396         }
1397
1398         error = gfs2_dinode_dealloc(ip);
1399         if (error)
1400                 goto out_unlock;
1401
1402 out_truncate:
1403         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1404         if (error)
1405                 goto out_unlock;
1406         /* Needs to be done before glock release & also in a transaction */
1407         truncate_inode_pages(&inode->i_data, 0);
1408         gfs2_trans_end(sdp);
1409
1410 out_unlock:
1411         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1412                 gfs2_glock_dq(&ip->i_iopen_gh);
1413         gfs2_holder_uninit(&ip->i_iopen_gh);
1414         gfs2_glock_dq_uninit(&gh);
1415         if (error && error != GLR_TRYFAILED && error != -EROFS)
1416                 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1417 out:
1418         truncate_inode_pages(&inode->i_data, 0);
1419         clear_inode(inode);
1420 }
1421
1422 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1423 {
1424         struct gfs2_inode *ip;
1425
1426         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1427         if (ip) {
1428                 ip->i_flags = 0;
1429                 ip->i_gl = NULL;
1430         }
1431         return &ip->i_inode;
1432 }
1433
1434 static void gfs2_destroy_inode(struct inode *inode)
1435 {
1436         kmem_cache_free(gfs2_inode_cachep, inode);
1437 }
1438
1439 const struct super_operations gfs2_super_ops = {
1440         .alloc_inode            = gfs2_alloc_inode,
1441         .destroy_inode          = gfs2_destroy_inode,
1442         .write_inode            = gfs2_write_inode,
1443         .delete_inode           = gfs2_delete_inode,
1444         .put_super              = gfs2_put_super,
1445         .sync_fs                = gfs2_sync_fs,
1446         .freeze_fs              = gfs2_freeze,
1447         .unfreeze_fs            = gfs2_unfreeze,
1448         .statfs                 = gfs2_statfs,
1449         .remount_fs             = gfs2_remount_fs,
1450         .clear_inode            = gfs2_clear_inode,
1451         .drop_inode             = gfs2_drop_inode,
1452         .show_options           = gfs2_show_options,
1453 };
1454