[PATCH] select: fix returned timeval
[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/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/posix_acl.h>
29 #include <asm/uaccess.h>
30 #include <linux/seq_file.h>
31
32 #include "jfs_incore.h"
33 #include "jfs_filsys.h"
34 #include "jfs_inode.h"
35 #include "jfs_metapage.h"
36 #include "jfs_superblock.h"
37 #include "jfs_dmap.h"
38 #include "jfs_imap.h"
39 #include "jfs_acl.h"
40 #include "jfs_debug.h"
41
42 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
43 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
44 MODULE_LICENSE("GPL");
45
46 static kmem_cache_t * jfs_inode_cachep;
47
48 static struct super_operations jfs_super_operations;
49 static struct export_operations jfs_export_operations;
50 static struct file_system_type jfs_fs_type;
51
52 #define MAX_COMMIT_THREADS 64
53 static int commit_threads = 0;
54 module_param(commit_threads, int, 0);
55 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
56
57 int jfs_stop_threads;
58 static pid_t jfsIOthread;
59 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
60 static pid_t jfsSyncThread;
61 DECLARE_COMPLETION(jfsIOwait);
62
63 #ifdef CONFIG_JFS_DEBUG
64 int jfsloglevel = JFS_LOGLEVEL_WARN;
65 module_param(jfsloglevel, int, 0644);
66 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
67 #endif
68
69 static void jfs_handle_error(struct super_block *sb)
70 {
71         struct jfs_sb_info *sbi = JFS_SBI(sb);
72
73         if (sb->s_flags & MS_RDONLY)
74                 return;
75
76         updateSuper(sb, FM_DIRTY);
77
78         if (sbi->flag & JFS_ERR_PANIC)
79                 panic("JFS (device %s): panic forced after error\n",
80                         sb->s_id);
81         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
82                 jfs_err("ERROR: (device %s): remounting filesystem "
83                         "as read-only\n",
84                         sb->s_id);
85                 sb->s_flags |= MS_RDONLY;
86         } 
87
88         /* nothing is done for continue beyond marking the superblock dirty */
89 }
90
91 void jfs_error(struct super_block *sb, const char * function, ...)
92 {
93         static char error_buf[256];
94         va_list args;
95
96         va_start(args, function);
97         vsprintf(error_buf, function, args);
98         va_end(args);
99
100         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
101
102         jfs_handle_error(sb);
103 }
104
105 static struct inode *jfs_alloc_inode(struct super_block *sb)
106 {
107         struct jfs_inode_info *jfs_inode;
108
109         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
110         if (!jfs_inode)
111                 return NULL;
112         return &jfs_inode->vfs_inode;
113 }
114
115 static void jfs_destroy_inode(struct inode *inode)
116 {
117         struct jfs_inode_info *ji = JFS_IP(inode);
118
119         BUG_ON(!list_empty(&ji->anon_inode_list));
120
121         spin_lock_irq(&ji->ag_lock);
122         if (ji->active_ag != -1) {
123                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
124                 atomic_dec(&bmap->db_active[ji->active_ag]);
125                 ji->active_ag = -1;
126         }
127         spin_unlock_irq(&ji->ag_lock);
128
129 #ifdef CONFIG_JFS_POSIX_ACL
130         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
131                 posix_acl_release(ji->i_acl);
132                 ji->i_acl = JFS_ACL_NOT_CACHED;
133         }
134         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
135                 posix_acl_release(ji->i_default_acl);
136                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
137         }
138 #endif
139
140         kmem_cache_free(jfs_inode_cachep, ji);
141 }
142
143 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
144 {
145         struct jfs_sb_info *sbi = JFS_SBI(sb);
146         s64 maxinodes;
147         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
148
149         jfs_info("In jfs_statfs");
150         buf->f_type = JFS_SUPER_MAGIC;
151         buf->f_bsize = sbi->bsize;
152         buf->f_blocks = sbi->bmap->db_mapsize;
153         buf->f_bfree = sbi->bmap->db_nfree;
154         buf->f_bavail = sbi->bmap->db_nfree;
155         /*
156          * If we really return the number of allocated & free inodes, some
157          * applications will fail because they won't see enough free inodes.
158          * We'll try to calculate some guess as to how may inodes we can
159          * really allocate
160          *
161          * buf->f_files = atomic_read(&imap->im_numinos);
162          * buf->f_ffree = atomic_read(&imap->im_numfree);
163          */
164         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
165                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
166                          << L2INOSPEREXT), (s64) 0xffffffffLL);
167         buf->f_files = maxinodes;
168         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
169                                     atomic_read(&imap->im_numfree));
170
171         buf->f_namelen = JFS_NAME_MAX;
172         return 0;
173 }
174
175 static void jfs_put_super(struct super_block *sb)
176 {
177         struct jfs_sb_info *sbi = JFS_SBI(sb);
178         int rc;
179
180         jfs_info("In jfs_put_super");
181         rc = jfs_umount(sb);
182         if (rc)
183                 jfs_err("jfs_umount failed with return code %d", rc);
184         if (sbi->nls_tab)
185                 unload_nls(sbi->nls_tab);
186         sbi->nls_tab = NULL;
187
188         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
189         iput(sbi->direct_inode);
190         sbi->direct_inode = NULL;
191
192         kfree(sbi);
193 }
194
195 enum {
196         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
197         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
198         Opt_usrquota, Opt_grpquota
199 };
200
201 static match_table_t tokens = {
202         {Opt_integrity, "integrity"},
203         {Opt_nointegrity, "nointegrity"},
204         {Opt_iocharset, "iocharset=%s"},
205         {Opt_resize, "resize=%u"},
206         {Opt_resize_nosize, "resize"},
207         {Opt_errors, "errors=%s"},
208         {Opt_ignore, "noquota"},
209         {Opt_ignore, "quota"},
210         {Opt_usrquota, "usrquota"},
211         {Opt_grpquota, "grpquota"},
212         {Opt_err, NULL}
213 };
214
215 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
216                          int *flag)
217 {
218         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
219         char *p;
220         struct jfs_sb_info *sbi = JFS_SBI(sb);
221
222         *newLVSize = 0;
223
224         if (!options)
225                 return 1;
226
227         while ((p = strsep(&options, ",")) != NULL) {
228                 substring_t args[MAX_OPT_ARGS];
229                 int token;
230                 if (!*p)
231                         continue;
232
233                 token = match_token(p, tokens, args);
234                 switch (token) {
235                 case Opt_integrity:
236                         *flag &= ~JFS_NOINTEGRITY;
237                         break;
238                 case Opt_nointegrity:
239                         *flag |= JFS_NOINTEGRITY;
240                         break;
241                 case Opt_ignore:
242                         /* Silently ignore the quota options */
243                         /* Don't do anything ;-) */
244                         break;
245                 case Opt_iocharset:
246                         if (nls_map && nls_map != (void *) -1)
247                                 unload_nls(nls_map);
248                         if (!strcmp(args[0].from, "none"))
249                                 nls_map = NULL;
250                         else {
251                                 nls_map = load_nls(args[0].from);
252                                 if (!nls_map) {
253                                         printk(KERN_ERR
254                                                "JFS: charset not found\n");
255                                         goto cleanup;
256                                 }
257                         }
258                         break;
259                 case Opt_resize:
260                 {
261                         char *resize = args[0].from;
262                         *newLVSize = simple_strtoull(resize, &resize, 0);
263                         break;
264                 }
265                 case Opt_resize_nosize:
266                 {
267                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
268                                 sb->s_blocksize_bits;
269                         if (*newLVSize == 0)
270                                 printk(KERN_ERR
271                                        "JFS: Cannot determine volume size\n");
272                         break;
273                 }
274                 case Opt_errors:
275                 {
276                         char *errors = args[0].from;
277                         if (!errors || !*errors)
278                                 goto cleanup;
279                         if (!strcmp(errors, "continue")) {
280                                 *flag &= ~JFS_ERR_REMOUNT_RO;
281                                 *flag &= ~JFS_ERR_PANIC;
282                                 *flag |= JFS_ERR_CONTINUE;
283                         } else if (!strcmp(errors, "remount-ro")) {
284                                 *flag &= ~JFS_ERR_CONTINUE;
285                                 *flag &= ~JFS_ERR_PANIC;
286                                 *flag |= JFS_ERR_REMOUNT_RO;
287                         } else if (!strcmp(errors, "panic")) {
288                                 *flag &= ~JFS_ERR_CONTINUE;
289                                 *flag &= ~JFS_ERR_REMOUNT_RO;
290                                 *flag |= JFS_ERR_PANIC;
291                         } else {
292                                 printk(KERN_ERR
293                                        "JFS: %s is an invalid error handler\n",
294                                        errors);
295                                 goto cleanup;
296                         }
297                         break;
298                 }
299
300 #if defined(CONFIG_QUOTA)
301                 case Opt_quota:
302                 case Opt_usrquota:
303                         *flag |= JFS_USRQUOTA;
304                         break;
305                 case Opt_grpquota:
306                         *flag |= JFS_GRPQUOTA;
307                         break;
308 #else
309                 case Opt_usrquota:
310                 case Opt_grpquota:
311                 case Opt_quota:
312                         printk(KERN_ERR
313                                "JFS: quota operations not supported\n");
314                         break;
315 #endif
316
317                 default:
318                         printk("jfs: Unrecognized mount option \"%s\" "
319                                         " or missing value\n", p);
320                         goto cleanup;
321                 }
322         }
323
324         if (nls_map != (void *) -1) {
325                 /* Discard old (if remount) */
326                 if (sbi->nls_tab)
327                         unload_nls(sbi->nls_tab);
328                 sbi->nls_tab = nls_map;
329         }
330         return 1;
331
332 cleanup:
333         if (nls_map && nls_map != (void *) -1)
334                 unload_nls(nls_map);
335         return 0;
336 }
337
338 static int jfs_remount(struct super_block *sb, int *flags, char *data)
339 {
340         s64 newLVSize = 0;
341         int rc = 0;
342         int flag = JFS_SBI(sb)->flag;
343
344         if (!parse_options(data, sb, &newLVSize, &flag)) {
345                 return -EINVAL;
346         }
347         if (newLVSize) {
348                 if (sb->s_flags & MS_RDONLY) {
349                         printk(KERN_ERR
350                   "JFS: resize requires volume to be mounted read-write\n");
351                         return -EROFS;
352                 }
353                 rc = jfs_extendfs(sb, newLVSize, 0);
354                 if (rc)
355                         return rc;
356         }
357
358         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
359                 /*
360                  * Invalidate any previously read metadata.  fsck may have
361                  * changed the on-disk data since we mounted r/o
362                  */
363                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
364
365                 JFS_SBI(sb)->flag = flag;
366                 return jfs_mount_rw(sb, 1);
367         }
368         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
369                 rc = jfs_umount_rw(sb);
370                 JFS_SBI(sb)->flag = flag;
371                 return rc;
372         }
373         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
374                 if (!(sb->s_flags & MS_RDONLY)) {
375                         rc = jfs_umount_rw(sb);
376                         if (rc)
377                                 return rc;
378                         JFS_SBI(sb)->flag = flag;
379                         return jfs_mount_rw(sb, 1);
380                 }
381         JFS_SBI(sb)->flag = flag;
382
383         return 0;
384 }
385
386 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
387 {
388         struct jfs_sb_info *sbi;
389         struct inode *inode;
390         int rc;
391         s64 newLVSize = 0;
392         int flag;
393
394         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
395
396         if (!new_valid_dev(sb->s_bdev->bd_dev))
397                 return -EOVERFLOW;
398
399         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
400         if (!sbi)
401                 return -ENOSPC;
402         memset(sbi, 0, sizeof (struct jfs_sb_info));
403         sb->s_fs_info = sbi;
404         sbi->sb = sb;
405
406         /* initialize the mount flag and determine the default error handler */
407         flag = JFS_ERR_REMOUNT_RO;
408
409         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
410                 kfree(sbi);
411                 return -EINVAL;
412         }
413         sbi->flag = flag;
414
415 #ifdef CONFIG_JFS_POSIX_ACL
416         sb->s_flags |= MS_POSIXACL;
417 #endif
418
419         if (newLVSize) {
420                 printk(KERN_ERR "resize option for remount only\n");
421                 return -EINVAL;
422         }
423
424         /*
425          * Initialize blocksize to 4K.
426          */
427         sb_set_blocksize(sb, PSIZE);
428
429         /*
430          * Set method vectors.
431          */
432         sb->s_op = &jfs_super_operations;
433         sb->s_export_op = &jfs_export_operations;
434
435         /*
436          * Initialize direct-mapping inode/address-space
437          */
438         inode = new_inode(sb);
439         if (inode == NULL)
440                 goto out_kfree;
441         inode->i_ino = 0;
442         inode->i_nlink = 1;
443         inode->i_size = sb->s_bdev->bd_inode->i_size;
444         inode->i_mapping->a_ops = &jfs_metapage_aops;
445         insert_inode_hash(inode);
446         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
447
448         sbi->direct_inode = inode;
449
450         rc = jfs_mount(sb);
451         if (rc) {
452                 if (!silent) {
453                         jfs_err("jfs_mount failed w/return code = %d", rc);
454                 }
455                 goto out_mount_failed;
456         }
457         if (sb->s_flags & MS_RDONLY)
458                 sbi->log = NULL;
459         else {
460                 rc = jfs_mount_rw(sb, 0);
461                 if (rc) {
462                         if (!silent) {
463                                 jfs_err("jfs_mount_rw failed, return code = %d",
464                                         rc);
465                         }
466                         goto out_no_rw;
467                 }
468         }
469
470         sb->s_magic = JFS_SUPER_MAGIC;
471
472         inode = iget(sb, ROOT_I);
473         if (!inode || is_bad_inode(inode))
474                 goto out_no_root;
475         sb->s_root = d_alloc_root(inode);
476         if (!sb->s_root)
477                 goto out_no_root;
478
479         if (sbi->mntflag & JFS_OS2)
480                 sb->s_root->d_op = &jfs_ci_dentry_operations;
481
482         /* logical blocks are represented by 40 bits in pxd_t, etc. */
483         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
484 #if BITS_PER_LONG == 32
485         /*
486          * Page cache is indexed by long.
487          * I would use MAX_LFS_FILESIZE, but it's only half as big
488          */
489         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
490 #endif
491         sb->s_time_gran = 1;
492         return 0;
493
494 out_no_root:
495         jfs_err("jfs_read_super: get root inode failed");
496         if (inode)
497                 iput(inode);
498
499 out_no_rw:
500         rc = jfs_umount(sb);
501         if (rc) {
502                 jfs_err("jfs_umount failed with return code %d", rc);
503         }
504 out_mount_failed:
505         filemap_write_and_wait(sbi->direct_inode->i_mapping);
506         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
507         make_bad_inode(sbi->direct_inode);
508         iput(sbi->direct_inode);
509         sbi->direct_inode = NULL;
510 out_kfree:
511         if (sbi->nls_tab)
512                 unload_nls(sbi->nls_tab);
513         kfree(sbi);
514         return -EINVAL;
515 }
516
517 static void jfs_write_super_lockfs(struct super_block *sb)
518 {
519         struct jfs_sb_info *sbi = JFS_SBI(sb);
520         struct jfs_log *log = sbi->log;
521
522         if (!(sb->s_flags & MS_RDONLY)) {
523                 txQuiesce(sb);
524                 lmLogShutdown(log);
525                 updateSuper(sb, FM_CLEAN);
526         }
527 }
528
529 static void jfs_unlockfs(struct super_block *sb)
530 {
531         struct jfs_sb_info *sbi = JFS_SBI(sb);
532         struct jfs_log *log = sbi->log;
533         int rc = 0;
534
535         if (!(sb->s_flags & MS_RDONLY)) {
536                 updateSuper(sb, FM_MOUNT);
537                 if ((rc = lmLogInit(log)))
538                         jfs_err("jfs_unlock failed with return code %d", rc);
539                 else
540                         txResume(sb);
541         }
542 }
543
544 static struct super_block *jfs_get_sb(struct file_system_type *fs_type, 
545         int flags, const char *dev_name, void *data)
546 {
547         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
548 }
549
550 static int jfs_sync_fs(struct super_block *sb, int wait)
551 {
552         struct jfs_log *log = JFS_SBI(sb)->log;
553
554         /* log == NULL indicates read-only mount */
555         if (log) {
556                 jfs_flush_journal(log, wait);
557                 jfs_syncpt(log, 0);
558         }
559
560         return 0;
561 }
562
563 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
564 {
565         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
566
567         if (sbi->flag & JFS_NOINTEGRITY)
568                 seq_puts(seq, ",nointegrity");
569         else
570                 seq_puts(seq, ",integrity");
571
572 #if defined(CONFIG_QUOTA)
573         if (sbi->flag & JFS_USRQUOTA)
574                 seq_puts(seq, ",usrquota");
575
576         if (sbi->flag & JFS_GRPQUOTA)
577                 seq_puts(seq, ",grpquota");
578 #endif
579
580         return 0;
581 }
582
583 static struct super_operations jfs_super_operations = {
584         .alloc_inode    = jfs_alloc_inode,
585         .destroy_inode  = jfs_destroy_inode,
586         .read_inode     = jfs_read_inode,
587         .dirty_inode    = jfs_dirty_inode,
588         .write_inode    = jfs_write_inode,
589         .delete_inode   = jfs_delete_inode,
590         .put_super      = jfs_put_super,
591         .sync_fs        = jfs_sync_fs,
592         .write_super_lockfs = jfs_write_super_lockfs,
593         .unlockfs       = jfs_unlockfs,
594         .statfs         = jfs_statfs,
595         .remount_fs     = jfs_remount,
596         .show_options   = jfs_show_options
597 };
598
599 static struct export_operations jfs_export_operations = {
600         .get_parent     = jfs_get_parent,
601 };
602
603 static struct file_system_type jfs_fs_type = {
604         .owner          = THIS_MODULE,
605         .name           = "jfs",
606         .get_sb         = jfs_get_sb,
607         .kill_sb        = kill_block_super,
608         .fs_flags       = FS_REQUIRES_DEV,
609 };
610
611 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
612 {
613         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
614
615         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
616             SLAB_CTOR_CONSTRUCTOR) {
617                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
618                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
619                 init_rwsem(&jfs_ip->rdwrlock);
620                 init_MUTEX(&jfs_ip->commit_sem);
621                 init_rwsem(&jfs_ip->xattr_sem);
622                 spin_lock_init(&jfs_ip->ag_lock);
623                 jfs_ip->active_ag = -1;
624 #ifdef CONFIG_JFS_POSIX_ACL
625                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
626                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
627 #endif
628                 inode_init_once(&jfs_ip->vfs_inode);
629         }
630 }
631
632 static int __init init_jfs_fs(void)
633 {
634         int i;
635         int rc;
636
637         jfs_inode_cachep =
638             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 
639                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
640         if (jfs_inode_cachep == NULL)
641                 return -ENOMEM;
642
643         /*
644          * Metapage initialization
645          */
646         rc = metapage_init();
647         if (rc) {
648                 jfs_err("metapage_init failed w/rc = %d", rc);
649                 goto free_slab;
650         }
651
652         /*
653          * Transaction Manager initialization
654          */
655         rc = txInit();
656         if (rc) {
657                 jfs_err("txInit failed w/rc = %d", rc);
658                 goto free_metapage;
659         }
660
661         /*
662          * I/O completion thread (endio)
663          */
664         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
665         if (jfsIOthread < 0) {
666                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
667                 goto end_txmngr;
668         }
669         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
670
671         if (commit_threads < 1)
672                 commit_threads = num_online_cpus();
673         if (commit_threads > MAX_COMMIT_THREADS)
674                 commit_threads = MAX_COMMIT_THREADS;
675
676         for (i = 0; i < commit_threads; i++) {
677                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
678                                                    CLONE_KERNEL);
679                 if (jfsCommitThread[i] < 0) {
680                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
681                                 jfsCommitThread[i]);
682                         commit_threads = i;
683                         goto kill_committask;
684                 }
685                 /* Wait until thread starts */
686                 wait_for_completion(&jfsIOwait);
687         }
688
689         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
690         if (jfsSyncThread < 0) {
691                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
692                 goto kill_committask;
693         }
694         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
695
696 #ifdef PROC_FS_JFS
697         jfs_proc_init();
698 #endif
699
700         return register_filesystem(&jfs_fs_type);
701
702 kill_committask:
703         jfs_stop_threads = 1;
704         wake_up_all(&jfs_commit_thread_wait);
705         for (i = 0; i < commit_threads; i++)
706                 wait_for_completion(&jfsIOwait);
707
708         wake_up(&jfs_IO_thread_wait);
709         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
710 end_txmngr:
711         txExit();
712 free_metapage:
713         metapage_exit();
714 free_slab:
715         kmem_cache_destroy(jfs_inode_cachep);
716         return rc;
717 }
718
719 static void __exit exit_jfs_fs(void)
720 {
721         int i;
722
723         jfs_info("exit_jfs_fs called");
724
725         jfs_stop_threads = 1;
726         txExit();
727         metapage_exit();
728         wake_up(&jfs_IO_thread_wait);
729         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
730         wake_up_all(&jfs_commit_thread_wait);
731         for (i = 0; i < commit_threads; i++)
732                 wait_for_completion(&jfsIOwait);
733         wake_up(&jfs_sync_thread_wait);
734         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
735 #ifdef PROC_FS_JFS
736         jfs_proc_clean();
737 #endif
738         unregister_filesystem(&jfs_fs_type);
739         kmem_cache_destroy(jfs_inode_cachep);
740 }
741
742 module_init(init_jfs_fs)
743 module_exit(exit_jfs_fs)