[PATCH] JFS: Write journal sync points more often
[linux-2.6.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 <asm/uaccess.h>
28
29 #include "jfs_incore.h"
30 #include "jfs_filsys.h"
31 #include "jfs_metapage.h"
32 #include "jfs_superblock.h"
33 #include "jfs_dmap.h"
34 #include "jfs_imap.h"
35 #include "jfs_acl.h"
36 #include "jfs_debug.h"
37
38 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
39 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
40 MODULE_LICENSE("GPL");
41
42 static kmem_cache_t * jfs_inode_cachep;
43
44 static struct super_operations jfs_super_operations;
45 static struct export_operations jfs_export_operations;
46 static struct file_system_type jfs_fs_type;
47
48 #define MAX_COMMIT_THREADS 64
49 static int commit_threads = 0;
50 module_param(commit_threads, int, 0);
51 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
52
53 int jfs_stop_threads;
54 static pid_t jfsIOthread;
55 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
56 static pid_t jfsSyncThread;
57 DECLARE_COMPLETION(jfsIOwait);
58
59 #ifdef CONFIG_JFS_DEBUG
60 int jfsloglevel = JFS_LOGLEVEL_WARN;
61 module_param(jfsloglevel, int, 0644);
62 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
63 #endif
64
65 /*
66  * External declarations
67  */
68 extern int jfs_mount(struct super_block *);
69 extern int jfs_mount_rw(struct super_block *, int);
70 extern int jfs_umount(struct super_block *);
71 extern int jfs_umount_rw(struct super_block *);
72
73 extern int jfsIOWait(void *);
74 extern int jfs_lazycommit(void *);
75 extern int jfs_sync(void *);
76
77 extern void jfs_read_inode(struct inode *inode);
78 extern void jfs_dirty_inode(struct inode *inode);
79 extern void jfs_delete_inode(struct inode *inode);
80 extern int jfs_write_inode(struct inode *inode, int wait);
81
82 extern struct dentry *jfs_get_parent(struct dentry *dentry);
83 extern int jfs_extendfs(struct super_block *, s64, int);
84
85 extern struct dentry_operations jfs_ci_dentry_operations;
86
87 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
88 extern void jfs_proc_init(void);
89 extern void jfs_proc_clean(void);
90 #endif
91
92 extern wait_queue_head_t jfs_IO_thread_wait;
93 extern wait_queue_head_t jfs_commit_thread_wait;
94 extern wait_queue_head_t jfs_sync_thread_wait;
95
96 static void jfs_handle_error(struct super_block *sb)
97 {
98         struct jfs_sb_info *sbi = JFS_SBI(sb);
99
100         if (sb->s_flags & MS_RDONLY)
101                 return;
102
103         updateSuper(sb, FM_DIRTY);
104
105         if (sbi->flag & JFS_ERR_PANIC)
106                 panic("JFS (device %s): panic forced after error\n",
107                         sb->s_id);
108         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
109                 jfs_err("ERROR: (device %s): remounting filesystem "
110                         "as read-only\n",
111                         sb->s_id);
112                 sb->s_flags |= MS_RDONLY;
113         } 
114
115         /* nothing is done for continue beyond marking the superblock dirty */
116 }
117
118 void jfs_error(struct super_block *sb, const char * function, ...)
119 {
120         static char error_buf[256];
121         va_list args;
122
123         va_start(args, function);
124         vsprintf(error_buf, function, args);
125         va_end(args);
126
127         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
128
129         jfs_handle_error(sb);
130 }
131
132 static struct inode *jfs_alloc_inode(struct super_block *sb)
133 {
134         struct jfs_inode_info *jfs_inode;
135
136         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
137         if (!jfs_inode)
138                 return NULL;
139         return &jfs_inode->vfs_inode;
140 }
141
142 static void jfs_destroy_inode(struct inode *inode)
143 {
144         struct jfs_inode_info *ji = JFS_IP(inode);
145
146         spin_lock_irq(&ji->ag_lock);
147         if (ji->active_ag != -1) {
148                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
149                 atomic_dec(&bmap->db_active[ji->active_ag]);
150                 ji->active_ag = -1;
151         }
152         spin_unlock_irq(&ji->ag_lock);
153
154 #ifdef CONFIG_JFS_POSIX_ACL
155         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
156                 posix_acl_release(ji->i_acl);
157                 ji->i_acl = JFS_ACL_NOT_CACHED;
158         }
159         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
160                 posix_acl_release(ji->i_default_acl);
161                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
162         }
163 #endif
164
165         kmem_cache_free(jfs_inode_cachep, ji);
166 }
167
168 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
169 {
170         struct jfs_sb_info *sbi = JFS_SBI(sb);
171         s64 maxinodes;
172         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
173
174         jfs_info("In jfs_statfs");
175         buf->f_type = JFS_SUPER_MAGIC;
176         buf->f_bsize = sbi->bsize;
177         buf->f_blocks = sbi->bmap->db_mapsize;
178         buf->f_bfree = sbi->bmap->db_nfree;
179         buf->f_bavail = sbi->bmap->db_nfree;
180         /*
181          * If we really return the number of allocated & free inodes, some
182          * applications will fail because they won't see enough free inodes.
183          * We'll try to calculate some guess as to how may inodes we can
184          * really allocate
185          *
186          * buf->f_files = atomic_read(&imap->im_numinos);
187          * buf->f_ffree = atomic_read(&imap->im_numfree);
188          */
189         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
190                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
191                          << L2INOSPEREXT), (s64) 0xffffffffLL);
192         buf->f_files = maxinodes;
193         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
194                                     atomic_read(&imap->im_numfree));
195
196         buf->f_namelen = JFS_NAME_MAX;
197         return 0;
198 }
199
200 static void jfs_put_super(struct super_block *sb)
201 {
202         struct jfs_sb_info *sbi = JFS_SBI(sb);
203         int rc;
204
205         jfs_info("In jfs_put_super");
206         rc = jfs_umount(sb);
207         if (rc)
208                 jfs_err("jfs_umount failed with return code %d", rc);
209         if (sbi->nls_tab)
210                 unload_nls(sbi->nls_tab);
211         sbi->nls_tab = NULL;
212
213         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
214         iput(sbi->direct_inode);
215         sbi->direct_inode = NULL;
216
217         kfree(sbi);
218 }
219
220 enum {
221         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
222         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
223 };
224
225 static match_table_t tokens = {
226         {Opt_integrity, "integrity"},
227         {Opt_nointegrity, "nointegrity"},
228         {Opt_iocharset, "iocharset=%s"},
229         {Opt_resize, "resize=%u"},
230         {Opt_resize_nosize, "resize"},
231         {Opt_errors, "errors=%s"},
232         {Opt_ignore, "noquota"},
233         {Opt_ignore, "quota"},
234         {Opt_ignore, "usrquota"},
235         {Opt_ignore, "grpquota"},
236         {Opt_err, NULL}
237 };
238
239 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
240                          int *flag)
241 {
242         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
243         char *p;
244         struct jfs_sb_info *sbi = JFS_SBI(sb);
245
246         *newLVSize = 0;
247
248         if (!options)
249                 return 1;
250
251         while ((p = strsep(&options, ",")) != NULL) {
252                 substring_t args[MAX_OPT_ARGS];
253                 int token;
254                 if (!*p)
255                         continue;
256
257                 token = match_token(p, tokens, args);
258                 switch (token) {
259                 case Opt_integrity:
260                         *flag &= ~JFS_NOINTEGRITY;
261                         break;
262                 case Opt_nointegrity:
263                         *flag |= JFS_NOINTEGRITY;
264                         break;
265                 case Opt_ignore:
266                         /* Silently ignore the quota options */
267                         /* Don't do anything ;-) */
268                         break;
269                 case Opt_iocharset:
270                         if (nls_map && nls_map != (void *) -1)
271                                 unload_nls(nls_map);
272                         if (!strcmp(args[0].from, "none"))
273                                 nls_map = NULL;
274                         else {
275                                 nls_map = load_nls(args[0].from);
276                                 if (!nls_map) {
277                                         printk(KERN_ERR
278                                                "JFS: charset not found\n");
279                                         goto cleanup;
280                                 }
281                         }
282                         break;
283                 case Opt_resize:
284                 {
285                         char *resize = args[0].from;
286                         *newLVSize = simple_strtoull(resize, &resize, 0);
287                         break;
288                 }
289                 case Opt_resize_nosize:
290                 {
291                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
292                                 sb->s_blocksize_bits;
293                         if (*newLVSize == 0)
294                                 printk(KERN_ERR
295                                        "JFS: Cannot determine volume size\n");
296                         break;
297                 }
298                 case Opt_errors:
299                 {
300                         char *errors = args[0].from;
301                         if (!errors || !*errors)
302                                 goto cleanup;
303                         if (!strcmp(errors, "continue")) {
304                                 *flag &= ~JFS_ERR_REMOUNT_RO;
305                                 *flag &= ~JFS_ERR_PANIC;
306                                 *flag |= JFS_ERR_CONTINUE;
307                         } else if (!strcmp(errors, "remount-ro")) {
308                                 *flag &= ~JFS_ERR_CONTINUE;
309                                 *flag &= ~JFS_ERR_PANIC;
310                                 *flag |= JFS_ERR_REMOUNT_RO;
311                         } else if (!strcmp(errors, "panic")) {
312                                 *flag &= ~JFS_ERR_CONTINUE;
313                                 *flag &= ~JFS_ERR_REMOUNT_RO;
314                                 *flag |= JFS_ERR_PANIC;
315                         } else {
316                                 printk(KERN_ERR
317                                        "JFS: %s is an invalid error handler\n",
318                                        errors);
319                                 goto cleanup;
320                         }
321                         break;
322                 }
323                 default:
324                         printk("jfs: Unrecognized mount option \"%s\" "
325                                         " or missing value\n", p);
326                         goto cleanup;
327                 }
328         }
329
330         if (nls_map != (void *) -1) {
331                 /* Discard old (if remount) */
332                 if (sbi->nls_tab)
333                         unload_nls(sbi->nls_tab);
334                 sbi->nls_tab = nls_map;
335         }
336         return 1;
337
338 cleanup:
339         if (nls_map && nls_map != (void *) -1)
340                 unload_nls(nls_map);
341         return 0;
342 }
343
344 static int jfs_remount(struct super_block *sb, int *flags, char *data)
345 {
346         s64 newLVSize = 0;
347         int rc = 0;
348         int flag = JFS_SBI(sb)->flag;
349
350         if (!parse_options(data, sb, &newLVSize, &flag)) {
351                 return -EINVAL;
352         }
353         if (newLVSize) {
354                 if (sb->s_flags & MS_RDONLY) {
355                         printk(KERN_ERR
356                   "JFS: resize requires volume to be mounted read-write\n");
357                         return -EROFS;
358                 }
359                 rc = jfs_extendfs(sb, newLVSize, 0);
360                 if (rc)
361                         return rc;
362         }
363
364         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
365                 /*
366                  * Invalidate any previously read metadata.  fsck may have
367                  * changed the on-disk data since we mounted r/o
368                  */
369                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
370
371                 JFS_SBI(sb)->flag = flag;
372                 return jfs_mount_rw(sb, 1);
373         }
374         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
375                 rc = jfs_umount_rw(sb);
376                 JFS_SBI(sb)->flag = flag;
377                 return rc;
378         }
379         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
380                 if (!(sb->s_flags & MS_RDONLY)) {
381                         rc = jfs_umount_rw(sb);
382                         if (rc)
383                                 return rc;
384                         JFS_SBI(sb)->flag = flag;
385                         return jfs_mount_rw(sb, 1);
386                 }
387         JFS_SBI(sb)->flag = flag;
388
389         return 0;
390 }
391
392 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
393 {
394         struct jfs_sb_info *sbi;
395         struct inode *inode;
396         int rc;
397         s64 newLVSize = 0;
398         int flag;
399
400         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
401
402         if (!new_valid_dev(sb->s_bdev->bd_dev))
403                 return -EOVERFLOW;
404
405         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
406         if (!sbi)
407                 return -ENOSPC;
408         memset(sbi, 0, sizeof (struct jfs_sb_info));
409         sb->s_fs_info = sbi;
410         sbi->sb = sb;
411
412         /* initialize the mount flag and determine the default error handler */
413         flag = JFS_ERR_REMOUNT_RO;
414
415         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
416                 kfree(sbi);
417                 return -EINVAL;
418         }
419         sbi->flag = flag;
420
421 #ifdef CONFIG_JFS_POSIX_ACL
422         sb->s_flags |= MS_POSIXACL;
423 #endif
424
425         if (newLVSize) {
426                 printk(KERN_ERR "resize option for remount only\n");
427                 return -EINVAL;
428         }
429
430         /*
431          * Initialize blocksize to 4K.
432          */
433         sb_set_blocksize(sb, PSIZE);
434
435         /*
436          * Set method vectors.
437          */
438         sb->s_op = &jfs_super_operations;
439         sb->s_export_op = &jfs_export_operations;
440
441         /*
442          * Initialize direct-mapping inode/address-space
443          */
444         inode = new_inode(sb);
445         if (inode == NULL)
446                 goto out_kfree;
447         inode->i_ino = 0;
448         inode->i_nlink = 1;
449         inode->i_size = sb->s_bdev->bd_inode->i_size;
450         inode->i_mapping->a_ops = &jfs_metapage_aops;
451         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
452
453         sbi->direct_inode = inode;
454
455         rc = jfs_mount(sb);
456         if (rc) {
457                 if (!silent) {
458                         jfs_err("jfs_mount failed w/return code = %d", rc);
459                 }
460                 goto out_mount_failed;
461         }
462         if (sb->s_flags & MS_RDONLY)
463                 sbi->log = NULL;
464         else {
465                 rc = jfs_mount_rw(sb, 0);
466                 if (rc) {
467                         if (!silent) {
468                                 jfs_err("jfs_mount_rw failed, return code = %d",
469                                         rc);
470                         }
471                         goto out_no_rw;
472                 }
473         }
474
475         sb->s_magic = JFS_SUPER_MAGIC;
476
477         inode = iget(sb, ROOT_I);
478         if (!inode || is_bad_inode(inode))
479                 goto out_no_root;
480         sb->s_root = d_alloc_root(inode);
481         if (!sb->s_root)
482                 goto out_no_root;
483
484         if (sbi->mntflag & JFS_OS2)
485                 sb->s_root->d_op = &jfs_ci_dentry_operations;
486
487         /* logical blocks are represented by 40 bits in pxd_t, etc. */
488         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
489 #if BITS_PER_LONG == 32
490         /*
491          * Page cache is indexed by long.
492          * I would use MAX_LFS_FILESIZE, but it's only half as big
493          */
494         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
495 #endif
496         sb->s_time_gran = 1;
497         return 0;
498
499 out_no_root:
500         jfs_err("jfs_read_super: get root inode failed");
501         if (inode)
502                 iput(inode);
503
504 out_no_rw:
505         rc = jfs_umount(sb);
506         if (rc) {
507                 jfs_err("jfs_umount failed with return code %d", rc);
508         }
509 out_mount_failed:
510         filemap_fdatawrite(sbi->direct_inode->i_mapping);
511         filemap_fdatawait(sbi->direct_inode->i_mapping);
512         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
513         make_bad_inode(sbi->direct_inode);
514         iput(sbi->direct_inode);
515         sbi->direct_inode = NULL;
516 out_kfree:
517         if (sbi->nls_tab)
518                 unload_nls(sbi->nls_tab);
519         kfree(sbi);
520         return -EINVAL;
521 }
522
523 static void jfs_write_super_lockfs(struct super_block *sb)
524 {
525         struct jfs_sb_info *sbi = JFS_SBI(sb);
526         struct jfs_log *log = sbi->log;
527
528         if (!(sb->s_flags & MS_RDONLY)) {
529                 txQuiesce(sb);
530                 lmLogShutdown(log);
531                 updateSuper(sb, FM_CLEAN);
532         }
533 }
534
535 static void jfs_unlockfs(struct super_block *sb)
536 {
537         struct jfs_sb_info *sbi = JFS_SBI(sb);
538         struct jfs_log *log = sbi->log;
539         int rc = 0;
540
541         if (!(sb->s_flags & MS_RDONLY)) {
542                 updateSuper(sb, FM_MOUNT);
543                 if ((rc = lmLogInit(log)))
544                         jfs_err("jfs_unlock failed with return code %d", rc);
545                 else
546                         txResume(sb);
547         }
548 }
549
550 static struct super_block *jfs_get_sb(struct file_system_type *fs_type, 
551         int flags, const char *dev_name, void *data)
552 {
553         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
554 }
555
556 static int jfs_sync_fs(struct super_block *sb, int wait)
557 {
558         struct jfs_log *log = JFS_SBI(sb)->log;
559
560         /* log == NULL indicates read-only mount */
561         if (log) {
562                 jfs_flush_journal(log, wait);
563                 jfs_syncpt(log);
564         }
565
566         return 0;
567 }
568
569 static struct super_operations jfs_super_operations = {
570         .alloc_inode    = jfs_alloc_inode,
571         .destroy_inode  = jfs_destroy_inode,
572         .read_inode     = jfs_read_inode,
573         .dirty_inode    = jfs_dirty_inode,
574         .write_inode    = jfs_write_inode,
575         .delete_inode   = jfs_delete_inode,
576         .put_super      = jfs_put_super,
577         .sync_fs        = jfs_sync_fs,
578         .write_super_lockfs = jfs_write_super_lockfs,
579         .unlockfs       = jfs_unlockfs,
580         .statfs         = jfs_statfs,
581         .remount_fs     = jfs_remount,
582 };
583
584 static struct export_operations jfs_export_operations = {
585         .get_parent     = jfs_get_parent,
586 };
587
588 static struct file_system_type jfs_fs_type = {
589         .owner          = THIS_MODULE,
590         .name           = "jfs",
591         .get_sb         = jfs_get_sb,
592         .kill_sb        = kill_block_super,
593         .fs_flags       = FS_REQUIRES_DEV,
594 };
595
596 extern int metapage_init(void);
597 extern int txInit(void);
598 extern void txExit(void);
599 extern void metapage_exit(void);
600
601 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
602 {
603         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
604
605         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
606             SLAB_CTOR_CONSTRUCTOR) {
607                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
608                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
609                 init_rwsem(&jfs_ip->rdwrlock);
610                 init_MUTEX(&jfs_ip->commit_sem);
611                 init_rwsem(&jfs_ip->xattr_sem);
612                 spin_lock_init(&jfs_ip->ag_lock);
613                 jfs_ip->active_ag = -1;
614 #ifdef CONFIG_JFS_POSIX_ACL
615                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
616                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
617 #endif
618                 inode_init_once(&jfs_ip->vfs_inode);
619         }
620 }
621
622 static int __init init_jfs_fs(void)
623 {
624         int i;
625         int rc;
626
627         jfs_inode_cachep =
628             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 
629                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
630         if (jfs_inode_cachep == NULL)
631                 return -ENOMEM;
632
633         /*
634          * Metapage initialization
635          */
636         rc = metapage_init();
637         if (rc) {
638                 jfs_err("metapage_init failed w/rc = %d", rc);
639                 goto free_slab;
640         }
641
642         /*
643          * Transaction Manager initialization
644          */
645         rc = txInit();
646         if (rc) {
647                 jfs_err("txInit failed w/rc = %d", rc);
648                 goto free_metapage;
649         }
650
651         /*
652          * I/O completion thread (endio)
653          */
654         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
655         if (jfsIOthread < 0) {
656                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
657                 goto end_txmngr;
658         }
659         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
660
661         if (commit_threads < 1)
662                 commit_threads = num_online_cpus();
663         if (commit_threads > MAX_COMMIT_THREADS)
664                 commit_threads = MAX_COMMIT_THREADS;
665
666         for (i = 0; i < commit_threads; i++) {
667                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
668                                                    CLONE_KERNEL);
669                 if (jfsCommitThread[i] < 0) {
670                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
671                                 jfsCommitThread[i]);
672                         commit_threads = i;
673                         goto kill_committask;
674                 }
675                 /* Wait until thread starts */
676                 wait_for_completion(&jfsIOwait);
677         }
678
679         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
680         if (jfsSyncThread < 0) {
681                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
682                 goto kill_committask;
683         }
684         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
685
686 #ifdef PROC_FS_JFS
687         jfs_proc_init();
688 #endif
689
690         return register_filesystem(&jfs_fs_type);
691
692 kill_committask:
693         jfs_stop_threads = 1;
694         wake_up_all(&jfs_commit_thread_wait);
695         for (i = 0; i < commit_threads; i++)
696                 wait_for_completion(&jfsIOwait);
697
698         wake_up(&jfs_IO_thread_wait);
699         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
700 end_txmngr:
701         txExit();
702 free_metapage:
703         metapage_exit();
704 free_slab:
705         kmem_cache_destroy(jfs_inode_cachep);
706         return rc;
707 }
708
709 static void __exit exit_jfs_fs(void)
710 {
711         int i;
712
713         jfs_info("exit_jfs_fs called");
714
715         jfs_stop_threads = 1;
716         txExit();
717         metapage_exit();
718         wake_up(&jfs_IO_thread_wait);
719         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
720         wake_up_all(&jfs_commit_thread_wait);
721         for (i = 0; i < commit_threads; i++)
722                 wait_for_completion(&jfsIOwait);
723         wake_up(&jfs_sync_thread_wait);
724         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
725 #ifdef PROC_FS_JFS
726         jfs_proc_clean();
727 #endif
728         unregister_filesystem(&jfs_fs_type);
729         kmem_cache_destroy(jfs_inode_cachep);
730 }
731
732 module_init(init_jfs_fs)
733 module_exit(exit_jfs_fs)