JFS: Fix race in txLock
[linux-3.10.git] / fs / jfs / super.c
1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2004
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or 
8  *   (at your option) any later version.
9  * 
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software 
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19
20 #include <linux/fs.h>
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/parser.h>
24 #include <linux/completion.h>
25 #include <linux/vfs.h>
26 #include <linux/moduleparam.h>
27 #include <linux/posix_acl.h>
28 #include <asm/uaccess.h>
29
30 #include "jfs_incore.h"
31 #include "jfs_filsys.h"
32 #include "jfs_inode.h"
33 #include "jfs_metapage.h"
34 #include "jfs_superblock.h"
35 #include "jfs_dmap.h"
36 #include "jfs_imap.h"
37 #include "jfs_acl.h"
38 #include "jfs_debug.h"
39
40 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
41 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
42 MODULE_LICENSE("GPL");
43
44 static kmem_cache_t * jfs_inode_cachep;
45
46 static struct super_operations jfs_super_operations;
47 static struct export_operations jfs_export_operations;
48 static struct file_system_type jfs_fs_type;
49
50 #define MAX_COMMIT_THREADS 64
51 static int commit_threads = 0;
52 module_param(commit_threads, int, 0);
53 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
54
55 int jfs_stop_threads;
56 static pid_t jfsIOthread;
57 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
58 static pid_t jfsSyncThread;
59 DECLARE_COMPLETION(jfsIOwait);
60
61 #ifdef CONFIG_JFS_DEBUG
62 int jfsloglevel = JFS_LOGLEVEL_WARN;
63 module_param(jfsloglevel, int, 0644);
64 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
65 #endif
66
67 static void jfs_handle_error(struct super_block *sb)
68 {
69         struct jfs_sb_info *sbi = JFS_SBI(sb);
70
71         if (sb->s_flags & MS_RDONLY)
72                 return;
73
74         updateSuper(sb, FM_DIRTY);
75
76         if (sbi->flag & JFS_ERR_PANIC)
77                 panic("JFS (device %s): panic forced after error\n",
78                         sb->s_id);
79         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
80                 jfs_err("ERROR: (device %s): remounting filesystem "
81                         "as read-only\n",
82                         sb->s_id);
83                 sb->s_flags |= MS_RDONLY;
84         } 
85
86         /* nothing is done for continue beyond marking the superblock dirty */
87 }
88
89 void jfs_error(struct super_block *sb, const char * function, ...)
90 {
91         static char error_buf[256];
92         va_list args;
93
94         va_start(args, function);
95         vsprintf(error_buf, function, args);
96         va_end(args);
97
98         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
99
100         jfs_handle_error(sb);
101 }
102
103 static struct inode *jfs_alloc_inode(struct super_block *sb)
104 {
105         struct jfs_inode_info *jfs_inode;
106
107         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
108         if (!jfs_inode)
109                 return NULL;
110         return &jfs_inode->vfs_inode;
111 }
112
113 static void jfs_destroy_inode(struct inode *inode)
114 {
115         struct jfs_inode_info *ji = JFS_IP(inode);
116
117         BUG_ON(!list_empty(&ji->anon_inode_list));
118
119         spin_lock_irq(&ji->ag_lock);
120         if (ji->active_ag != -1) {
121                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
122                 atomic_dec(&bmap->db_active[ji->active_ag]);
123                 ji->active_ag = -1;
124         }
125         spin_unlock_irq(&ji->ag_lock);
126
127 #ifdef CONFIG_JFS_POSIX_ACL
128         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
129                 posix_acl_release(ji->i_acl);
130                 ji->i_acl = JFS_ACL_NOT_CACHED;
131         }
132         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
133                 posix_acl_release(ji->i_default_acl);
134                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
135         }
136 #endif
137
138         kmem_cache_free(jfs_inode_cachep, ji);
139 }
140
141 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
142 {
143         struct jfs_sb_info *sbi = JFS_SBI(sb);
144         s64 maxinodes;
145         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
146
147         jfs_info("In jfs_statfs");
148         buf->f_type = JFS_SUPER_MAGIC;
149         buf->f_bsize = sbi->bsize;
150         buf->f_blocks = sbi->bmap->db_mapsize;
151         buf->f_bfree = sbi->bmap->db_nfree;
152         buf->f_bavail = sbi->bmap->db_nfree;
153         /*
154          * If we really return the number of allocated & free inodes, some
155          * applications will fail because they won't see enough free inodes.
156          * We'll try to calculate some guess as to how may inodes we can
157          * really allocate
158          *
159          * buf->f_files = atomic_read(&imap->im_numinos);
160          * buf->f_ffree = atomic_read(&imap->im_numfree);
161          */
162         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
163                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
164                          << L2INOSPEREXT), (s64) 0xffffffffLL);
165         buf->f_files = maxinodes;
166         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
167                                     atomic_read(&imap->im_numfree));
168
169         buf->f_namelen = JFS_NAME_MAX;
170         return 0;
171 }
172
173 static void jfs_put_super(struct super_block *sb)
174 {
175         struct jfs_sb_info *sbi = JFS_SBI(sb);
176         int rc;
177
178         jfs_info("In jfs_put_super");
179         rc = jfs_umount(sb);
180         if (rc)
181                 jfs_err("jfs_umount failed with return code %d", rc);
182         if (sbi->nls_tab)
183                 unload_nls(sbi->nls_tab);
184         sbi->nls_tab = NULL;
185
186         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
187         iput(sbi->direct_inode);
188         sbi->direct_inode = NULL;
189
190         kfree(sbi);
191 }
192
193 enum {
194         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
195         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
196 };
197
198 static match_table_t tokens = {
199         {Opt_integrity, "integrity"},
200         {Opt_nointegrity, "nointegrity"},
201         {Opt_iocharset, "iocharset=%s"},
202         {Opt_resize, "resize=%u"},
203         {Opt_resize_nosize, "resize"},
204         {Opt_errors, "errors=%s"},
205         {Opt_ignore, "noquota"},
206         {Opt_ignore, "quota"},
207         {Opt_ignore, "usrquota"},
208         {Opt_ignore, "grpquota"},
209         {Opt_err, NULL}
210 };
211
212 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
213                          int *flag)
214 {
215         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
216         char *p;
217         struct jfs_sb_info *sbi = JFS_SBI(sb);
218
219         *newLVSize = 0;
220
221         if (!options)
222                 return 1;
223
224         while ((p = strsep(&options, ",")) != NULL) {
225                 substring_t args[MAX_OPT_ARGS];
226                 int token;
227                 if (!*p)
228                         continue;
229
230                 token = match_token(p, tokens, args);
231                 switch (token) {
232                 case Opt_integrity:
233                         *flag &= ~JFS_NOINTEGRITY;
234                         break;
235                 case Opt_nointegrity:
236                         *flag |= JFS_NOINTEGRITY;
237                         break;
238                 case Opt_ignore:
239                         /* Silently ignore the quota options */
240                         /* Don't do anything ;-) */
241                         break;
242                 case Opt_iocharset:
243                         if (nls_map && nls_map != (void *) -1)
244                                 unload_nls(nls_map);
245                         if (!strcmp(args[0].from, "none"))
246                                 nls_map = NULL;
247                         else {
248                                 nls_map = load_nls(args[0].from);
249                                 if (!nls_map) {
250                                         printk(KERN_ERR
251                                                "JFS: charset not found\n");
252                                         goto cleanup;
253                                 }
254                         }
255                         break;
256                 case Opt_resize:
257                 {
258                         char *resize = args[0].from;
259                         *newLVSize = simple_strtoull(resize, &resize, 0);
260                         break;
261                 }
262                 case Opt_resize_nosize:
263                 {
264                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
265                                 sb->s_blocksize_bits;
266                         if (*newLVSize == 0)
267                                 printk(KERN_ERR
268                                        "JFS: Cannot determine volume size\n");
269                         break;
270                 }
271                 case Opt_errors:
272                 {
273                         char *errors = args[0].from;
274                         if (!errors || !*errors)
275                                 goto cleanup;
276                         if (!strcmp(errors, "continue")) {
277                                 *flag &= ~JFS_ERR_REMOUNT_RO;
278                                 *flag &= ~JFS_ERR_PANIC;
279                                 *flag |= JFS_ERR_CONTINUE;
280                         } else if (!strcmp(errors, "remount-ro")) {
281                                 *flag &= ~JFS_ERR_CONTINUE;
282                                 *flag &= ~JFS_ERR_PANIC;
283                                 *flag |= JFS_ERR_REMOUNT_RO;
284                         } else if (!strcmp(errors, "panic")) {
285                                 *flag &= ~JFS_ERR_CONTINUE;
286                                 *flag &= ~JFS_ERR_REMOUNT_RO;
287                                 *flag |= JFS_ERR_PANIC;
288                         } else {
289                                 printk(KERN_ERR
290                                        "JFS: %s is an invalid error handler\n",
291                                        errors);
292                                 goto cleanup;
293                         }
294                         break;
295                 }
296                 default:
297                         printk("jfs: Unrecognized mount option \"%s\" "
298                                         " or missing value\n", p);
299                         goto cleanup;
300                 }
301         }
302
303         if (nls_map != (void *) -1) {
304                 /* Discard old (if remount) */
305                 if (sbi->nls_tab)
306                         unload_nls(sbi->nls_tab);
307                 sbi->nls_tab = nls_map;
308         }
309         return 1;
310
311 cleanup:
312         if (nls_map && nls_map != (void *) -1)
313                 unload_nls(nls_map);
314         return 0;
315 }
316
317 static int jfs_remount(struct super_block *sb, int *flags, char *data)
318 {
319         s64 newLVSize = 0;
320         int rc = 0;
321         int flag = JFS_SBI(sb)->flag;
322
323         if (!parse_options(data, sb, &newLVSize, &flag)) {
324                 return -EINVAL;
325         }
326         if (newLVSize) {
327                 if (sb->s_flags & MS_RDONLY) {
328                         printk(KERN_ERR
329                   "JFS: resize requires volume to be mounted read-write\n");
330                         return -EROFS;
331                 }
332                 rc = jfs_extendfs(sb, newLVSize, 0);
333                 if (rc)
334                         return rc;
335         }
336
337         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
338                 /*
339                  * Invalidate any previously read metadata.  fsck may have
340                  * changed the on-disk data since we mounted r/o
341                  */
342                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
343
344                 JFS_SBI(sb)->flag = flag;
345                 return jfs_mount_rw(sb, 1);
346         }
347         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
348                 rc = jfs_umount_rw(sb);
349                 JFS_SBI(sb)->flag = flag;
350                 return rc;
351         }
352         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
353                 if (!(sb->s_flags & MS_RDONLY)) {
354                         rc = jfs_umount_rw(sb);
355                         if (rc)
356                                 return rc;
357                         JFS_SBI(sb)->flag = flag;
358                         return jfs_mount_rw(sb, 1);
359                 }
360         JFS_SBI(sb)->flag = flag;
361
362         return 0;
363 }
364
365 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
366 {
367         struct jfs_sb_info *sbi;
368         struct inode *inode;
369         int rc;
370         s64 newLVSize = 0;
371         int flag;
372
373         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
374
375         if (!new_valid_dev(sb->s_bdev->bd_dev))
376                 return -EOVERFLOW;
377
378         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
379         if (!sbi)
380                 return -ENOSPC;
381         memset(sbi, 0, sizeof (struct jfs_sb_info));
382         sb->s_fs_info = sbi;
383         sbi->sb = sb;
384
385         /* initialize the mount flag and determine the default error handler */
386         flag = JFS_ERR_REMOUNT_RO;
387
388         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
389                 kfree(sbi);
390                 return -EINVAL;
391         }
392         sbi->flag = flag;
393
394 #ifdef CONFIG_JFS_POSIX_ACL
395         sb->s_flags |= MS_POSIXACL;
396 #endif
397
398         if (newLVSize) {
399                 printk(KERN_ERR "resize option for remount only\n");
400                 return -EINVAL;
401         }
402
403         /*
404          * Initialize blocksize to 4K.
405          */
406         sb_set_blocksize(sb, PSIZE);
407
408         /*
409          * Set method vectors.
410          */
411         sb->s_op = &jfs_super_operations;
412         sb->s_export_op = &jfs_export_operations;
413
414         /*
415          * Initialize direct-mapping inode/address-space
416          */
417         inode = new_inode(sb);
418         if (inode == NULL)
419                 goto out_kfree;
420         inode->i_ino = 0;
421         inode->i_nlink = 1;
422         inode->i_size = sb->s_bdev->bd_inode->i_size;
423         inode->i_mapping->a_ops = &jfs_metapage_aops;
424         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
425
426         sbi->direct_inode = inode;
427
428         rc = jfs_mount(sb);
429         if (rc) {
430                 if (!silent) {
431                         jfs_err("jfs_mount failed w/return code = %d", rc);
432                 }
433                 goto out_mount_failed;
434         }
435         if (sb->s_flags & MS_RDONLY)
436                 sbi->log = NULL;
437         else {
438                 rc = jfs_mount_rw(sb, 0);
439                 if (rc) {
440                         if (!silent) {
441                                 jfs_err("jfs_mount_rw failed, return code = %d",
442                                         rc);
443                         }
444                         goto out_no_rw;
445                 }
446         }
447
448         sb->s_magic = JFS_SUPER_MAGIC;
449
450         inode = iget(sb, ROOT_I);
451         if (!inode || is_bad_inode(inode))
452                 goto out_no_root;
453         sb->s_root = d_alloc_root(inode);
454         if (!sb->s_root)
455                 goto out_no_root;
456
457         if (sbi->mntflag & JFS_OS2)
458                 sb->s_root->d_op = &jfs_ci_dentry_operations;
459
460         /* logical blocks are represented by 40 bits in pxd_t, etc. */
461         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
462 #if BITS_PER_LONG == 32
463         /*
464          * Page cache is indexed by long.
465          * I would use MAX_LFS_FILESIZE, but it's only half as big
466          */
467         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
468 #endif
469         sb->s_time_gran = 1;
470         return 0;
471
472 out_no_root:
473         jfs_err("jfs_read_super: get root inode failed");
474         if (inode)
475                 iput(inode);
476
477 out_no_rw:
478         rc = jfs_umount(sb);
479         if (rc) {
480                 jfs_err("jfs_umount failed with return code %d", rc);
481         }
482 out_mount_failed:
483         filemap_fdatawrite(sbi->direct_inode->i_mapping);
484         filemap_fdatawait(sbi->direct_inode->i_mapping);
485         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
486         make_bad_inode(sbi->direct_inode);
487         iput(sbi->direct_inode);
488         sbi->direct_inode = NULL;
489 out_kfree:
490         if (sbi->nls_tab)
491                 unload_nls(sbi->nls_tab);
492         kfree(sbi);
493         return -EINVAL;
494 }
495
496 static void jfs_write_super_lockfs(struct super_block *sb)
497 {
498         struct jfs_sb_info *sbi = JFS_SBI(sb);
499         struct jfs_log *log = sbi->log;
500
501         if (!(sb->s_flags & MS_RDONLY)) {
502                 txQuiesce(sb);
503                 lmLogShutdown(log);
504                 updateSuper(sb, FM_CLEAN);
505         }
506 }
507
508 static void jfs_unlockfs(struct super_block *sb)
509 {
510         struct jfs_sb_info *sbi = JFS_SBI(sb);
511         struct jfs_log *log = sbi->log;
512         int rc = 0;
513
514         if (!(sb->s_flags & MS_RDONLY)) {
515                 updateSuper(sb, FM_MOUNT);
516                 if ((rc = lmLogInit(log)))
517                         jfs_err("jfs_unlock failed with return code %d", rc);
518                 else
519                         txResume(sb);
520         }
521 }
522
523 static struct super_block *jfs_get_sb(struct file_system_type *fs_type, 
524         int flags, const char *dev_name, void *data)
525 {
526         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
527 }
528
529 static int jfs_sync_fs(struct super_block *sb, int wait)
530 {
531         struct jfs_log *log = JFS_SBI(sb)->log;
532
533         /* log == NULL indicates read-only mount */
534         if (log) {
535                 jfs_flush_journal(log, wait);
536                 jfs_syncpt(log, 0);
537         }
538
539         return 0;
540 }
541
542 static struct super_operations jfs_super_operations = {
543         .alloc_inode    = jfs_alloc_inode,
544         .destroy_inode  = jfs_destroy_inode,
545         .read_inode     = jfs_read_inode,
546         .dirty_inode    = jfs_dirty_inode,
547         .write_inode    = jfs_write_inode,
548         .delete_inode   = jfs_delete_inode,
549         .put_super      = jfs_put_super,
550         .sync_fs        = jfs_sync_fs,
551         .write_super_lockfs = jfs_write_super_lockfs,
552         .unlockfs       = jfs_unlockfs,
553         .statfs         = jfs_statfs,
554         .remount_fs     = jfs_remount,
555 };
556
557 static struct export_operations jfs_export_operations = {
558         .get_parent     = jfs_get_parent,
559 };
560
561 static struct file_system_type jfs_fs_type = {
562         .owner          = THIS_MODULE,
563         .name           = "jfs",
564         .get_sb         = jfs_get_sb,
565         .kill_sb        = kill_block_super,
566         .fs_flags       = FS_REQUIRES_DEV,
567 };
568
569 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
570 {
571         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
572
573         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
574             SLAB_CTOR_CONSTRUCTOR) {
575                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
576                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
577                 init_rwsem(&jfs_ip->rdwrlock);
578                 init_MUTEX(&jfs_ip->commit_sem);
579                 init_rwsem(&jfs_ip->xattr_sem);
580                 spin_lock_init(&jfs_ip->ag_lock);
581                 jfs_ip->active_ag = -1;
582 #ifdef CONFIG_JFS_POSIX_ACL
583                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
584                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
585 #endif
586                 inode_init_once(&jfs_ip->vfs_inode);
587         }
588 }
589
590 static int __init init_jfs_fs(void)
591 {
592         int i;
593         int rc;
594
595         jfs_inode_cachep =
596             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 
597                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
598         if (jfs_inode_cachep == NULL)
599                 return -ENOMEM;
600
601         /*
602          * Metapage initialization
603          */
604         rc = metapage_init();
605         if (rc) {
606                 jfs_err("metapage_init failed w/rc = %d", rc);
607                 goto free_slab;
608         }
609
610         /*
611          * Transaction Manager initialization
612          */
613         rc = txInit();
614         if (rc) {
615                 jfs_err("txInit failed w/rc = %d", rc);
616                 goto free_metapage;
617         }
618
619         /*
620          * I/O completion thread (endio)
621          */
622         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
623         if (jfsIOthread < 0) {
624                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
625                 goto end_txmngr;
626         }
627         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
628
629         if (commit_threads < 1)
630                 commit_threads = num_online_cpus();
631         if (commit_threads > MAX_COMMIT_THREADS)
632                 commit_threads = MAX_COMMIT_THREADS;
633
634         for (i = 0; i < commit_threads; i++) {
635                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
636                                                    CLONE_KERNEL);
637                 if (jfsCommitThread[i] < 0) {
638                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
639                                 jfsCommitThread[i]);
640                         commit_threads = i;
641                         goto kill_committask;
642                 }
643                 /* Wait until thread starts */
644                 wait_for_completion(&jfsIOwait);
645         }
646
647         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
648         if (jfsSyncThread < 0) {
649                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
650                 goto kill_committask;
651         }
652         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
653
654 #ifdef PROC_FS_JFS
655         jfs_proc_init();
656 #endif
657
658         return register_filesystem(&jfs_fs_type);
659
660 kill_committask:
661         jfs_stop_threads = 1;
662         wake_up_all(&jfs_commit_thread_wait);
663         for (i = 0; i < commit_threads; i++)
664                 wait_for_completion(&jfsIOwait);
665
666         wake_up(&jfs_IO_thread_wait);
667         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
668 end_txmngr:
669         txExit();
670 free_metapage:
671         metapage_exit();
672 free_slab:
673         kmem_cache_destroy(jfs_inode_cachep);
674         return rc;
675 }
676
677 static void __exit exit_jfs_fs(void)
678 {
679         int i;
680
681         jfs_info("exit_jfs_fs called");
682
683         jfs_stop_threads = 1;
684         txExit();
685         metapage_exit();
686         wake_up(&jfs_IO_thread_wait);
687         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
688         wake_up_all(&jfs_commit_thread_wait);
689         for (i = 0; i < commit_threads; i++)
690                 wait_for_completion(&jfsIOwait);
691         wake_up(&jfs_sync_thread_wait);
692         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
693 #ifdef PROC_FS_JFS
694         jfs_proc_clean();
695 #endif
696         unregister_filesystem(&jfs_fs_type);
697         kmem_cache_destroy(jfs_inode_cachep);
698 }
699
700 module_init(init_jfs_fs)
701 module_exit(exit_jfs_fs)