Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/mount.h>
26 #include <linux/moduleparam.h>
27 #include <linux/kthread.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 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
58 struct task_struct *jfsIOthread;
59 struct task_struct *jfsSyncThread;
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 dentry *dentry, struct kstatfs *buf)
142 {
143         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_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, Opt_quota,
196         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
197 };
198
199 static match_table_t tokens = {
200         {Opt_integrity, "integrity"},
201         {Opt_nointegrity, "nointegrity"},
202         {Opt_iocharset, "iocharset=%s"},
203         {Opt_resize, "resize=%u"},
204         {Opt_resize_nosize, "resize"},
205         {Opt_errors, "errors=%s"},
206         {Opt_ignore, "noquota"},
207         {Opt_ignore, "quota"},
208         {Opt_usrquota, "usrquota"},
209         {Opt_grpquota, "grpquota"},
210         {Opt_uid, "uid=%u"},
211         {Opt_gid, "gid=%u"},
212         {Opt_umask, "umask=%u"},
213         {Opt_err, NULL}
214 };
215
216 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
217                          int *flag)
218 {
219         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
220         char *p;
221         struct jfs_sb_info *sbi = JFS_SBI(sb);
222
223         *newLVSize = 0;
224
225         if (!options)
226                 return 1;
227
228         while ((p = strsep(&options, ",")) != NULL) {
229                 substring_t args[MAX_OPT_ARGS];
230                 int token;
231                 if (!*p)
232                         continue;
233
234                 token = match_token(p, tokens, args);
235                 switch (token) {
236                 case Opt_integrity:
237                         *flag &= ~JFS_NOINTEGRITY;
238                         break;
239                 case Opt_nointegrity:
240                         *flag |= JFS_NOINTEGRITY;
241                         break;
242                 case Opt_ignore:
243                         /* Silently ignore the quota options */
244                         /* Don't do anything ;-) */
245                         break;
246                 case Opt_iocharset:
247                         if (nls_map && nls_map != (void *) -1)
248                                 unload_nls(nls_map);
249                         if (!strcmp(args[0].from, "none"))
250                                 nls_map = NULL;
251                         else {
252                                 nls_map = load_nls(args[0].from);
253                                 if (!nls_map) {
254                                         printk(KERN_ERR
255                                                "JFS: charset not found\n");
256                                         goto cleanup;
257                                 }
258                         }
259                         break;
260                 case Opt_resize:
261                 {
262                         char *resize = args[0].from;
263                         *newLVSize = simple_strtoull(resize, &resize, 0);
264                         break;
265                 }
266                 case Opt_resize_nosize:
267                 {
268                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
269                                 sb->s_blocksize_bits;
270                         if (*newLVSize == 0)
271                                 printk(KERN_ERR
272                                        "JFS: Cannot determine volume size\n");
273                         break;
274                 }
275                 case Opt_errors:
276                 {
277                         char *errors = args[0].from;
278                         if (!errors || !*errors)
279                                 goto cleanup;
280                         if (!strcmp(errors, "continue")) {
281                                 *flag &= ~JFS_ERR_REMOUNT_RO;
282                                 *flag &= ~JFS_ERR_PANIC;
283                                 *flag |= JFS_ERR_CONTINUE;
284                         } else if (!strcmp(errors, "remount-ro")) {
285                                 *flag &= ~JFS_ERR_CONTINUE;
286                                 *flag &= ~JFS_ERR_PANIC;
287                                 *flag |= JFS_ERR_REMOUNT_RO;
288                         } else if (!strcmp(errors, "panic")) {
289                                 *flag &= ~JFS_ERR_CONTINUE;
290                                 *flag &= ~JFS_ERR_REMOUNT_RO;
291                                 *flag |= JFS_ERR_PANIC;
292                         } else {
293                                 printk(KERN_ERR
294                                        "JFS: %s is an invalid error handler\n",
295                                        errors);
296                                 goto cleanup;
297                         }
298                         break;
299                 }
300
301 #if defined(CONFIG_QUOTA)
302                 case Opt_quota:
303                 case Opt_usrquota:
304                         *flag |= JFS_USRQUOTA;
305                         break;
306                 case Opt_grpquota:
307                         *flag |= JFS_GRPQUOTA;
308                         break;
309 #else
310                 case Opt_usrquota:
311                 case Opt_grpquota:
312                 case Opt_quota:
313                         printk(KERN_ERR
314                                "JFS: quota operations not supported\n");
315                         break;
316 #endif
317                 case Opt_uid:
318                 {
319                         char *uid = args[0].from;
320                         sbi->uid = simple_strtoul(uid, &uid, 0);
321                         break;
322                 }
323                 case Opt_gid:
324                 {
325                         char *gid = args[0].from;
326                         sbi->gid = simple_strtoul(gid, &gid, 0);
327                         break;
328                 }
329                 case Opt_umask:
330                 {
331                         char *umask = args[0].from;
332                         sbi->umask = simple_strtoul(umask, &umask, 8);
333                         if (sbi->umask & ~0777) {
334                                 printk(KERN_ERR
335                                        "JFS: Invalid value of umask\n");
336                                 goto cleanup;
337                         }
338                         break;
339                 }
340                 default:
341                         printk("jfs: Unrecognized mount option \"%s\" "
342                                         " or missing value\n", p);
343                         goto cleanup;
344                 }
345         }
346
347         if (nls_map != (void *) -1) {
348                 /* Discard old (if remount) */
349                 if (sbi->nls_tab)
350                         unload_nls(sbi->nls_tab);
351                 sbi->nls_tab = nls_map;
352         }
353         return 1;
354
355 cleanup:
356         if (nls_map && nls_map != (void *) -1)
357                 unload_nls(nls_map);
358         return 0;
359 }
360
361 static int jfs_remount(struct super_block *sb, int *flags, char *data)
362 {
363         s64 newLVSize = 0;
364         int rc = 0;
365         int flag = JFS_SBI(sb)->flag;
366
367         if (!parse_options(data, sb, &newLVSize, &flag)) {
368                 return -EINVAL;
369         }
370         if (newLVSize) {
371                 if (sb->s_flags & MS_RDONLY) {
372                         printk(KERN_ERR
373                   "JFS: resize requires volume to be mounted read-write\n");
374                         return -EROFS;
375                 }
376                 rc = jfs_extendfs(sb, newLVSize, 0);
377                 if (rc)
378                         return rc;
379         }
380
381         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
382                 /*
383                  * Invalidate any previously read metadata.  fsck may have
384                  * changed the on-disk data since we mounted r/o
385                  */
386                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
387
388                 JFS_SBI(sb)->flag = flag;
389                 return jfs_mount_rw(sb, 1);
390         }
391         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
392                 rc = jfs_umount_rw(sb);
393                 JFS_SBI(sb)->flag = flag;
394                 return rc;
395         }
396         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
397                 if (!(sb->s_flags & MS_RDONLY)) {
398                         rc = jfs_umount_rw(sb);
399                         if (rc)
400                                 return rc;
401                         JFS_SBI(sb)->flag = flag;
402                         return jfs_mount_rw(sb, 1);
403                 }
404         JFS_SBI(sb)->flag = flag;
405
406         return 0;
407 }
408
409 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
410 {
411         struct jfs_sb_info *sbi;
412         struct inode *inode;
413         int rc;
414         s64 newLVSize = 0;
415         int flag;
416
417         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
418
419         if (!new_valid_dev(sb->s_bdev->bd_dev))
420                 return -EOVERFLOW;
421
422         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
423         if (!sbi)
424                 return -ENOSPC;
425         sb->s_fs_info = sbi;
426         sbi->sb = sb;
427         sbi->uid = sbi->gid = sbi->umask = -1;
428
429         /* initialize the mount flag and determine the default error handler */
430         flag = JFS_ERR_REMOUNT_RO;
431
432         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
433                 kfree(sbi);
434                 return -EINVAL;
435         }
436         sbi->flag = flag;
437
438 #ifdef CONFIG_JFS_POSIX_ACL
439         sb->s_flags |= MS_POSIXACL;
440 #endif
441
442         if (newLVSize) {
443                 printk(KERN_ERR "resize option for remount only\n");
444                 return -EINVAL;
445         }
446
447         /*
448          * Initialize blocksize to 4K.
449          */
450         sb_set_blocksize(sb, PSIZE);
451
452         /*
453          * Set method vectors.
454          */
455         sb->s_op = &jfs_super_operations;
456         sb->s_export_op = &jfs_export_operations;
457
458         /*
459          * Initialize direct-mapping inode/address-space
460          */
461         inode = new_inode(sb);
462         if (inode == NULL)
463                 goto out_kfree;
464         inode->i_ino = 0;
465         inode->i_nlink = 1;
466         inode->i_size = sb->s_bdev->bd_inode->i_size;
467         inode->i_mapping->a_ops = &jfs_metapage_aops;
468         insert_inode_hash(inode);
469         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
470
471         sbi->direct_inode = inode;
472
473         rc = jfs_mount(sb);
474         if (rc) {
475                 if (!silent) {
476                         jfs_err("jfs_mount failed w/return code = %d", rc);
477                 }
478                 goto out_mount_failed;
479         }
480         if (sb->s_flags & MS_RDONLY)
481                 sbi->log = NULL;
482         else {
483                 rc = jfs_mount_rw(sb, 0);
484                 if (rc) {
485                         if (!silent) {
486                                 jfs_err("jfs_mount_rw failed, return code = %d",
487                                         rc);
488                         }
489                         goto out_no_rw;
490                 }
491         }
492
493         sb->s_magic = JFS_SUPER_MAGIC;
494
495         inode = iget(sb, ROOT_I);
496         if (!inode || is_bad_inode(inode))
497                 goto out_no_root;
498         sb->s_root = d_alloc_root(inode);
499         if (!sb->s_root)
500                 goto out_no_root;
501
502         if (sbi->mntflag & JFS_OS2)
503                 sb->s_root->d_op = &jfs_ci_dentry_operations;
504
505         /* logical blocks are represented by 40 bits in pxd_t, etc. */
506         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
507 #if BITS_PER_LONG == 32
508         /*
509          * Page cache is indexed by long.
510          * I would use MAX_LFS_FILESIZE, but it's only half as big
511          */
512         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
513 #endif
514         sb->s_time_gran = 1;
515         return 0;
516
517 out_no_root:
518         jfs_err("jfs_read_super: get root inode failed");
519         if (inode)
520                 iput(inode);
521
522 out_no_rw:
523         rc = jfs_umount(sb);
524         if (rc) {
525                 jfs_err("jfs_umount failed with return code %d", rc);
526         }
527 out_mount_failed:
528         filemap_write_and_wait(sbi->direct_inode->i_mapping);
529         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
530         make_bad_inode(sbi->direct_inode);
531         iput(sbi->direct_inode);
532         sbi->direct_inode = NULL;
533 out_kfree:
534         if (sbi->nls_tab)
535                 unload_nls(sbi->nls_tab);
536         kfree(sbi);
537         return -EINVAL;
538 }
539
540 static void jfs_write_super_lockfs(struct super_block *sb)
541 {
542         struct jfs_sb_info *sbi = JFS_SBI(sb);
543         struct jfs_log *log = sbi->log;
544
545         if (!(sb->s_flags & MS_RDONLY)) {
546                 txQuiesce(sb);
547                 lmLogShutdown(log);
548                 updateSuper(sb, FM_CLEAN);
549         }
550 }
551
552 static void jfs_unlockfs(struct super_block *sb)
553 {
554         struct jfs_sb_info *sbi = JFS_SBI(sb);
555         struct jfs_log *log = sbi->log;
556         int rc = 0;
557
558         if (!(sb->s_flags & MS_RDONLY)) {
559                 updateSuper(sb, FM_MOUNT);
560                 if ((rc = lmLogInit(log)))
561                         jfs_err("jfs_unlock failed with return code %d", rc);
562                 else
563                         txResume(sb);
564         }
565 }
566
567 static int jfs_get_sb(struct file_system_type *fs_type,
568         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
569 {
570         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
571                            mnt);
572 }
573
574 static int jfs_sync_fs(struct super_block *sb, int wait)
575 {
576         struct jfs_log *log = JFS_SBI(sb)->log;
577
578         /* log == NULL indicates read-only mount */
579         if (log) {
580                 jfs_flush_journal(log, wait);
581                 jfs_syncpt(log, 0);
582         }
583
584         return 0;
585 }
586
587 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
588 {
589         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
590
591         if (sbi->uid != -1)
592                 seq_printf(seq, ",uid=%d", sbi->uid);
593         if (sbi->gid != -1)
594                 seq_printf(seq, ",gid=%d", sbi->gid);
595         if (sbi->umask != -1)
596                 seq_printf(seq, ",umask=%03o", sbi->umask);
597         if (sbi->flag & JFS_NOINTEGRITY)
598                 seq_puts(seq, ",nointegrity");
599
600 #if defined(CONFIG_QUOTA)
601         if (sbi->flag & JFS_USRQUOTA)
602                 seq_puts(seq, ",usrquota");
603
604         if (sbi->flag & JFS_GRPQUOTA)
605                 seq_puts(seq, ",grpquota");
606 #endif
607
608         return 0;
609 }
610
611 static struct super_operations jfs_super_operations = {
612         .alloc_inode    = jfs_alloc_inode,
613         .destroy_inode  = jfs_destroy_inode,
614         .read_inode     = jfs_read_inode,
615         .dirty_inode    = jfs_dirty_inode,
616         .write_inode    = jfs_write_inode,
617         .delete_inode   = jfs_delete_inode,
618         .put_super      = jfs_put_super,
619         .sync_fs        = jfs_sync_fs,
620         .write_super_lockfs = jfs_write_super_lockfs,
621         .unlockfs       = jfs_unlockfs,
622         .statfs         = jfs_statfs,
623         .remount_fs     = jfs_remount,
624         .show_options   = jfs_show_options
625 };
626
627 static struct export_operations jfs_export_operations = {
628         .get_parent     = jfs_get_parent,
629 };
630
631 static struct file_system_type jfs_fs_type = {
632         .owner          = THIS_MODULE,
633         .name           = "jfs",
634         .get_sb         = jfs_get_sb,
635         .kill_sb        = kill_block_super,
636         .fs_flags       = FS_REQUIRES_DEV,
637 };
638
639 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
640 {
641         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
642
643         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
644             SLAB_CTOR_CONSTRUCTOR) {
645                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
646                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
647                 init_rwsem(&jfs_ip->rdwrlock);
648                 mutex_init(&jfs_ip->commit_mutex);
649                 init_rwsem(&jfs_ip->xattr_sem);
650                 spin_lock_init(&jfs_ip->ag_lock);
651                 jfs_ip->active_ag = -1;
652 #ifdef CONFIG_JFS_POSIX_ACL
653                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
654                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
655 #endif
656                 inode_init_once(&jfs_ip->vfs_inode);
657         }
658 }
659
660 static int __init init_jfs_fs(void)
661 {
662         int i;
663         int rc;
664
665         jfs_inode_cachep =
666             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 
667                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
668                             init_once, NULL);
669         if (jfs_inode_cachep == NULL)
670                 return -ENOMEM;
671
672         /*
673          * Metapage initialization
674          */
675         rc = metapage_init();
676         if (rc) {
677                 jfs_err("metapage_init failed w/rc = %d", rc);
678                 goto free_slab;
679         }
680
681         /*
682          * Transaction Manager initialization
683          */
684         rc = txInit();
685         if (rc) {
686                 jfs_err("txInit failed w/rc = %d", rc);
687                 goto free_metapage;
688         }
689
690         /*
691          * I/O completion thread (endio)
692          */
693         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
694         if (IS_ERR(jfsIOthread)) {
695                 rc = PTR_ERR(jfsIOthread);
696                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
697                 goto end_txmngr;
698         }
699
700         if (commit_threads < 1)
701                 commit_threads = num_online_cpus();
702         if (commit_threads > MAX_COMMIT_THREADS)
703                 commit_threads = MAX_COMMIT_THREADS;
704
705         for (i = 0; i < commit_threads; i++) {
706                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
707                 if (IS_ERR(jfsCommitThread[i])) {
708                         rc = PTR_ERR(jfsCommitThread[i]);
709                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
710                         commit_threads = i;
711                         goto kill_committask;
712                 }
713         }
714
715         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
716         if (IS_ERR(jfsSyncThread)) {
717                 rc = PTR_ERR(jfsSyncThread);
718                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
719                 goto kill_committask;
720         }
721
722 #ifdef PROC_FS_JFS
723         jfs_proc_init();
724 #endif
725
726         return register_filesystem(&jfs_fs_type);
727
728 kill_committask:
729         for (i = 0; i < commit_threads; i++)
730                 kthread_stop(jfsCommitThread[i]);
731         kthread_stop(jfsIOthread);
732 end_txmngr:
733         txExit();
734 free_metapage:
735         metapage_exit();
736 free_slab:
737         kmem_cache_destroy(jfs_inode_cachep);
738         return rc;
739 }
740
741 static void __exit exit_jfs_fs(void)
742 {
743         int i;
744
745         jfs_info("exit_jfs_fs called");
746
747         txExit();
748         metapage_exit();
749
750         kthread_stop(jfsIOthread);
751         for (i = 0; i < commit_threads; i++)
752                 kthread_stop(jfsCommitThread[i]);
753         kthread_stop(jfsSyncThread);
754 #ifdef PROC_FS_JFS
755         jfs_proc_clean();
756 #endif
757         unregister_filesystem(&jfs_fs_type);
758         kmem_cache_destroy(jfs_inode_cachep);
759 }
760
761 module_init(init_jfs_fs)
762 module_exit(exit_jfs_fs)