missing unlock in jfs_quota_write()
[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/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/kthread.h>
29 #include <linux/posix_acl.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/crc32.h>
33 #include <asm/uaccess.h>
34 #include <linux/seq_file.h>
35
36 #include "jfs_incore.h"
37 #include "jfs_filsys.h"
38 #include "jfs_inode.h"
39 #include "jfs_metapage.h"
40 #include "jfs_superblock.h"
41 #include "jfs_dmap.h"
42 #include "jfs_imap.h"
43 #include "jfs_acl.h"
44 #include "jfs_debug.h"
45
46 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
47 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
48 MODULE_LICENSE("GPL");
49
50 static struct kmem_cache * jfs_inode_cachep;
51
52 static const struct super_operations jfs_super_operations;
53 static const struct export_operations jfs_export_operations;
54 static struct file_system_type jfs_fs_type;
55
56 #define MAX_COMMIT_THREADS 64
57 static int commit_threads = 0;
58 module_param(commit_threads, int, 0);
59 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
60
61 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
62 struct task_struct *jfsIOthread;
63 struct task_struct *jfsSyncThread;
64
65 #ifdef CONFIG_JFS_DEBUG
66 int jfsloglevel = JFS_LOGLEVEL_WARN;
67 module_param(jfsloglevel, int, 0644);
68 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
69 #endif
70
71 static void jfs_handle_error(struct super_block *sb)
72 {
73         struct jfs_sb_info *sbi = JFS_SBI(sb);
74
75         if (sb->s_flags & MS_RDONLY)
76                 return;
77
78         updateSuper(sb, FM_DIRTY);
79
80         if (sbi->flag & JFS_ERR_PANIC)
81                 panic("JFS (device %s): panic forced after error\n",
82                         sb->s_id);
83         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
84                 jfs_err("ERROR: (device %s): remounting filesystem "
85                         "as read-only\n",
86                         sb->s_id);
87                 sb->s_flags |= MS_RDONLY;
88         }
89
90         /* nothing is done for continue beyond marking the superblock dirty */
91 }
92
93 void jfs_error(struct super_block *sb, const char * function, ...)
94 {
95         static char error_buf[256];
96         va_list args;
97
98         va_start(args, function);
99         vsnprintf(error_buf, sizeof(error_buf), function, args);
100         va_end(args);
101
102         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
103
104         jfs_handle_error(sb);
105 }
106
107 static struct inode *jfs_alloc_inode(struct super_block *sb)
108 {
109         struct jfs_inode_info *jfs_inode;
110
111         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
112         if (!jfs_inode)
113                 return NULL;
114         return &jfs_inode->vfs_inode;
115 }
116
117 static void jfs_destroy_inode(struct inode *inode)
118 {
119         struct jfs_inode_info *ji = JFS_IP(inode);
120
121         BUG_ON(!list_empty(&ji->anon_inode_list));
122
123         spin_lock_irq(&ji->ag_lock);
124         if (ji->active_ag != -1) {
125                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
126                 atomic_dec(&bmap->db_active[ji->active_ag]);
127                 ji->active_ag = -1;
128         }
129         spin_unlock_irq(&ji->ag_lock);
130
131 #ifdef CONFIG_JFS_POSIX_ACL
132         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
133                 posix_acl_release(ji->i_acl);
134                 ji->i_acl = JFS_ACL_NOT_CACHED;
135         }
136         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
137                 posix_acl_release(ji->i_default_acl);
138                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
139         }
140 #endif
141
142         kmem_cache_free(jfs_inode_cachep, ji);
143 }
144
145 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
146 {
147         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
148         s64 maxinodes;
149         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
150
151         jfs_info("In jfs_statfs");
152         buf->f_type = JFS_SUPER_MAGIC;
153         buf->f_bsize = sbi->bsize;
154         buf->f_blocks = sbi->bmap->db_mapsize;
155         buf->f_bfree = sbi->bmap->db_nfree;
156         buf->f_bavail = sbi->bmap->db_nfree;
157         /*
158          * If we really return the number of allocated & free inodes, some
159          * applications will fail because they won't see enough free inodes.
160          * We'll try to calculate some guess as to how may inodes we can
161          * really allocate
162          *
163          * buf->f_files = atomic_read(&imap->im_numinos);
164          * buf->f_ffree = atomic_read(&imap->im_numfree);
165          */
166         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
167                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
168                          << L2INOSPEREXT), (s64) 0xffffffffLL);
169         buf->f_files = maxinodes;
170         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
171                                     atomic_read(&imap->im_numfree));
172         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
173         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
174                                         sizeof(sbi->uuid)/2);
175
176         buf->f_namelen = JFS_NAME_MAX;
177         return 0;
178 }
179
180 static void jfs_put_super(struct super_block *sb)
181 {
182         struct jfs_sb_info *sbi = JFS_SBI(sb);
183         int rc;
184
185         jfs_info("In jfs_put_super");
186         rc = jfs_umount(sb);
187         if (rc)
188                 jfs_err("jfs_umount failed with return code %d", rc);
189         if (sbi->nls_tab)
190                 unload_nls(sbi->nls_tab);
191         sbi->nls_tab = NULL;
192
193         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
194         iput(sbi->direct_inode);
195         sbi->direct_inode = NULL;
196
197         kfree(sbi);
198 }
199
200 enum {
201         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
202         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
203         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
204 };
205
206 static const match_table_t tokens = {
207         {Opt_integrity, "integrity"},
208         {Opt_nointegrity, "nointegrity"},
209         {Opt_iocharset, "iocharset=%s"},
210         {Opt_resize, "resize=%u"},
211         {Opt_resize_nosize, "resize"},
212         {Opt_errors, "errors=%s"},
213         {Opt_ignore, "noquota"},
214         {Opt_ignore, "quota"},
215         {Opt_usrquota, "usrquota"},
216         {Opt_grpquota, "grpquota"},
217         {Opt_uid, "uid=%u"},
218         {Opt_gid, "gid=%u"},
219         {Opt_umask, "umask=%u"},
220         {Opt_err, NULL}
221 };
222
223 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
224                          int *flag)
225 {
226         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
227         char *p;
228         struct jfs_sb_info *sbi = JFS_SBI(sb);
229
230         *newLVSize = 0;
231
232         if (!options)
233                 return 1;
234
235         while ((p = strsep(&options, ",")) != NULL) {
236                 substring_t args[MAX_OPT_ARGS];
237                 int token;
238                 if (!*p)
239                         continue;
240
241                 token = match_token(p, tokens, args);
242                 switch (token) {
243                 case Opt_integrity:
244                         *flag &= ~JFS_NOINTEGRITY;
245                         break;
246                 case Opt_nointegrity:
247                         *flag |= JFS_NOINTEGRITY;
248                         break;
249                 case Opt_ignore:
250                         /* Silently ignore the quota options */
251                         /* Don't do anything ;-) */
252                         break;
253                 case Opt_iocharset:
254                         if (nls_map && nls_map != (void *) -1)
255                                 unload_nls(nls_map);
256                         if (!strcmp(args[0].from, "none"))
257                                 nls_map = NULL;
258                         else {
259                                 nls_map = load_nls(args[0].from);
260                                 if (!nls_map) {
261                                         printk(KERN_ERR
262                                                "JFS: charset not found\n");
263                                         goto cleanup;
264                                 }
265                         }
266                         break;
267                 case Opt_resize:
268                 {
269                         char *resize = args[0].from;
270                         *newLVSize = simple_strtoull(resize, &resize, 0);
271                         break;
272                 }
273                 case Opt_resize_nosize:
274                 {
275                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
276                                 sb->s_blocksize_bits;
277                         if (*newLVSize == 0)
278                                 printk(KERN_ERR
279                                        "JFS: Cannot determine volume size\n");
280                         break;
281                 }
282                 case Opt_errors:
283                 {
284                         char *errors = args[0].from;
285                         if (!errors || !*errors)
286                                 goto cleanup;
287                         if (!strcmp(errors, "continue")) {
288                                 *flag &= ~JFS_ERR_REMOUNT_RO;
289                                 *flag &= ~JFS_ERR_PANIC;
290                                 *flag |= JFS_ERR_CONTINUE;
291                         } else if (!strcmp(errors, "remount-ro")) {
292                                 *flag &= ~JFS_ERR_CONTINUE;
293                                 *flag &= ~JFS_ERR_PANIC;
294                                 *flag |= JFS_ERR_REMOUNT_RO;
295                         } else if (!strcmp(errors, "panic")) {
296                                 *flag &= ~JFS_ERR_CONTINUE;
297                                 *flag &= ~JFS_ERR_REMOUNT_RO;
298                                 *flag |= JFS_ERR_PANIC;
299                         } else {
300                                 printk(KERN_ERR
301                                        "JFS: %s is an invalid error handler\n",
302                                        errors);
303                                 goto cleanup;
304                         }
305                         break;
306                 }
307
308 #ifdef CONFIG_QUOTA
309                 case Opt_quota:
310                 case Opt_usrquota:
311                         *flag |= JFS_USRQUOTA;
312                         break;
313                 case Opt_grpquota:
314                         *flag |= JFS_GRPQUOTA;
315                         break;
316 #else
317                 case Opt_usrquota:
318                 case Opt_grpquota:
319                 case Opt_quota:
320                         printk(KERN_ERR
321                                "JFS: quota operations not supported\n");
322                         break;
323 #endif
324                 case Opt_uid:
325                 {
326                         char *uid = args[0].from;
327                         sbi->uid = simple_strtoul(uid, &uid, 0);
328                         break;
329                 }
330                 case Opt_gid:
331                 {
332                         char *gid = args[0].from;
333                         sbi->gid = simple_strtoul(gid, &gid, 0);
334                         break;
335                 }
336                 case Opt_umask:
337                 {
338                         char *umask = args[0].from;
339                         sbi->umask = simple_strtoul(umask, &umask, 8);
340                         if (sbi->umask & ~0777) {
341                                 printk(KERN_ERR
342                                        "JFS: Invalid value of umask\n");
343                                 goto cleanup;
344                         }
345                         break;
346                 }
347                 default:
348                         printk("jfs: Unrecognized mount option \"%s\" "
349                                         " or missing value\n", p);
350                         goto cleanup;
351                 }
352         }
353
354         if (nls_map != (void *) -1) {
355                 /* Discard old (if remount) */
356                 if (sbi->nls_tab)
357                         unload_nls(sbi->nls_tab);
358                 sbi->nls_tab = nls_map;
359         }
360         return 1;
361
362 cleanup:
363         if (nls_map && nls_map != (void *) -1)
364                 unload_nls(nls_map);
365         return 0;
366 }
367
368 static int jfs_remount(struct super_block *sb, int *flags, char *data)
369 {
370         s64 newLVSize = 0;
371         int rc = 0;
372         int flag = JFS_SBI(sb)->flag;
373
374         if (!parse_options(data, sb, &newLVSize, &flag)) {
375                 return -EINVAL;
376         }
377         if (newLVSize) {
378                 if (sb->s_flags & MS_RDONLY) {
379                         printk(KERN_ERR
380                   "JFS: resize requires volume to be mounted read-write\n");
381                         return -EROFS;
382                 }
383                 rc = jfs_extendfs(sb, newLVSize, 0);
384                 if (rc)
385                         return rc;
386         }
387
388         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
389                 /*
390                  * Invalidate any previously read metadata.  fsck may have
391                  * changed the on-disk data since we mounted r/o
392                  */
393                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
394
395                 JFS_SBI(sb)->flag = flag;
396                 return jfs_mount_rw(sb, 1);
397         }
398         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
399                 rc = jfs_umount_rw(sb);
400                 JFS_SBI(sb)->flag = flag;
401                 return rc;
402         }
403         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
404                 if (!(sb->s_flags & MS_RDONLY)) {
405                         rc = jfs_umount_rw(sb);
406                         if (rc)
407                                 return rc;
408                         JFS_SBI(sb)->flag = flag;
409                         return jfs_mount_rw(sb, 1);
410                 }
411         JFS_SBI(sb)->flag = flag;
412
413         return 0;
414 }
415
416 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
417 {
418         struct jfs_sb_info *sbi;
419         struct inode *inode;
420         int rc;
421         s64 newLVSize = 0;
422         int flag, ret = -EINVAL;
423
424         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
425
426         if (!new_valid_dev(sb->s_bdev->bd_dev))
427                 return -EOVERFLOW;
428
429         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
430         if (!sbi)
431                 return -ENOMEM;
432         sb->s_fs_info = sbi;
433         sbi->sb = sb;
434         sbi->uid = sbi->gid = sbi->umask = -1;
435
436         /* initialize the mount flag and determine the default error handler */
437         flag = JFS_ERR_REMOUNT_RO;
438
439         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
440                 kfree(sbi);
441                 return -EINVAL;
442         }
443         sbi->flag = flag;
444
445 #ifdef CONFIG_JFS_POSIX_ACL
446         sb->s_flags |= MS_POSIXACL;
447 #endif
448
449         if (newLVSize) {
450                 printk(KERN_ERR "resize option for remount only\n");
451                 return -EINVAL;
452         }
453
454         /*
455          * Initialize blocksize to 4K.
456          */
457         sb_set_blocksize(sb, PSIZE);
458
459         /*
460          * Set method vectors.
461          */
462         sb->s_op = &jfs_super_operations;
463         sb->s_export_op = &jfs_export_operations;
464
465         /*
466          * Initialize direct-mapping inode/address-space
467          */
468         inode = new_inode(sb);
469         if (inode == NULL) {
470                 ret = -ENOMEM;
471                 goto out_kfree;
472         }
473         inode->i_ino = 0;
474         inode->i_nlink = 1;
475         inode->i_size = sb->s_bdev->bd_inode->i_size;
476         inode->i_mapping->a_ops = &jfs_metapage_aops;
477         insert_inode_hash(inode);
478         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
479
480         sbi->direct_inode = inode;
481
482         rc = jfs_mount(sb);
483         if (rc) {
484                 if (!silent) {
485                         jfs_err("jfs_mount failed w/return code = %d", rc);
486                 }
487                 goto out_mount_failed;
488         }
489         if (sb->s_flags & MS_RDONLY)
490                 sbi->log = NULL;
491         else {
492                 rc = jfs_mount_rw(sb, 0);
493                 if (rc) {
494                         if (!silent) {
495                                 jfs_err("jfs_mount_rw failed, return code = %d",
496                                         rc);
497                         }
498                         goto out_no_rw;
499                 }
500         }
501
502         sb->s_magic = JFS_SUPER_MAGIC;
503
504         inode = jfs_iget(sb, ROOT_I);
505         if (IS_ERR(inode)) {
506                 ret = PTR_ERR(inode);
507                 goto out_no_rw;
508         }
509         sb->s_root = d_alloc_root(inode);
510         if (!sb->s_root)
511                 goto out_no_root;
512
513         if (sbi->mntflag & JFS_OS2)
514                 sb->s_root->d_op = &jfs_ci_dentry_operations;
515
516         /* logical blocks are represented by 40 bits in pxd_t, etc. */
517         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
518 #if BITS_PER_LONG == 32
519         /*
520          * Page cache is indexed by long.
521          * I would use MAX_LFS_FILESIZE, but it's only half as big
522          */
523         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
524 #endif
525         sb->s_time_gran = 1;
526         return 0;
527
528 out_no_root:
529         jfs_err("jfs_read_super: get root dentry failed");
530         iput(inode);
531
532 out_no_rw:
533         rc = jfs_umount(sb);
534         if (rc) {
535                 jfs_err("jfs_umount failed with return code %d", rc);
536         }
537 out_mount_failed:
538         filemap_write_and_wait(sbi->direct_inode->i_mapping);
539         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
540         make_bad_inode(sbi->direct_inode);
541         iput(sbi->direct_inode);
542         sbi->direct_inode = NULL;
543 out_kfree:
544         if (sbi->nls_tab)
545                 unload_nls(sbi->nls_tab);
546         kfree(sbi);
547         return ret;
548 }
549
550 static int jfs_freeze(struct super_block *sb)
551 {
552         struct jfs_sb_info *sbi = JFS_SBI(sb);
553         struct jfs_log *log = sbi->log;
554
555         if (!(sb->s_flags & MS_RDONLY)) {
556                 txQuiesce(sb);
557                 lmLogShutdown(log);
558                 updateSuper(sb, FM_CLEAN);
559         }
560         return 0;
561 }
562
563 static int jfs_unfreeze(struct super_block *sb)
564 {
565         struct jfs_sb_info *sbi = JFS_SBI(sb);
566         struct jfs_log *log = sbi->log;
567         int rc = 0;
568
569         if (!(sb->s_flags & MS_RDONLY)) {
570                 updateSuper(sb, FM_MOUNT);
571                 if ((rc = lmLogInit(log)))
572                         jfs_err("jfs_unlock failed with return code %d", rc);
573                 else
574                         txResume(sb);
575         }
576         return 0;
577 }
578
579 static int jfs_get_sb(struct file_system_type *fs_type,
580         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
581 {
582         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
583                            mnt);
584 }
585
586 static int jfs_sync_fs(struct super_block *sb, int wait)
587 {
588         struct jfs_log *log = JFS_SBI(sb)->log;
589
590         /* log == NULL indicates read-only mount */
591         if (log) {
592                 jfs_flush_journal(log, wait);
593                 jfs_syncpt(log, 0);
594         }
595
596         return 0;
597 }
598
599 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
600 {
601         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
602
603         if (sbi->uid != -1)
604                 seq_printf(seq, ",uid=%d", sbi->uid);
605         if (sbi->gid != -1)
606                 seq_printf(seq, ",gid=%d", sbi->gid);
607         if (sbi->umask != -1)
608                 seq_printf(seq, ",umask=%03o", sbi->umask);
609         if (sbi->flag & JFS_NOINTEGRITY)
610                 seq_puts(seq, ",nointegrity");
611         if (sbi->nls_tab)
612                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
613         if (sbi->flag & JFS_ERR_CONTINUE)
614                 seq_printf(seq, ",errors=continue");
615         if (sbi->flag & JFS_ERR_PANIC)
616                 seq_printf(seq, ",errors=panic");
617
618 #ifdef CONFIG_QUOTA
619         if (sbi->flag & JFS_USRQUOTA)
620                 seq_puts(seq, ",usrquota");
621
622         if (sbi->flag & JFS_GRPQUOTA)
623                 seq_puts(seq, ",grpquota");
624 #endif
625
626         return 0;
627 }
628
629 #ifdef CONFIG_QUOTA
630
631 /* Read data from quotafile - avoid pagecache and such because we cannot afford
632  * acquiring the locks... As quota files are never truncated and quota code
633  * itself serializes the operations (and noone else should touch the files)
634  * we don't have to be afraid of races */
635 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
636                               size_t len, loff_t off)
637 {
638         struct inode *inode = sb_dqopt(sb)->files[type];
639         sector_t blk = off >> sb->s_blocksize_bits;
640         int err = 0;
641         int offset = off & (sb->s_blocksize - 1);
642         int tocopy;
643         size_t toread;
644         struct buffer_head tmp_bh;
645         struct buffer_head *bh;
646         loff_t i_size = i_size_read(inode);
647
648         if (off > i_size)
649                 return 0;
650         if (off+len > i_size)
651                 len = i_size-off;
652         toread = len;
653         while (toread > 0) {
654                 tocopy = sb->s_blocksize - offset < toread ?
655                                 sb->s_blocksize - offset : toread;
656
657                 tmp_bh.b_state = 0;
658                 tmp_bh.b_size = 1 << inode->i_blkbits;
659                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
660                 if (err)
661                         return err;
662                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
663                         memset(data, 0, tocopy);
664                 else {
665                         bh = sb_bread(sb, tmp_bh.b_blocknr);
666                         if (!bh)
667                                 return -EIO;
668                         memcpy(data, bh->b_data+offset, tocopy);
669                         brelse(bh);
670                 }
671                 offset = 0;
672                 toread -= tocopy;
673                 data += tocopy;
674                 blk++;
675         }
676         return len;
677 }
678
679 /* Write to quotafile */
680 static ssize_t jfs_quota_write(struct super_block *sb, int type,
681                                const char *data, size_t len, loff_t off)
682 {
683         struct inode *inode = sb_dqopt(sb)->files[type];
684         sector_t blk = off >> sb->s_blocksize_bits;
685         int err = 0;
686         int offset = off & (sb->s_blocksize - 1);
687         int tocopy;
688         size_t towrite = len;
689         struct buffer_head tmp_bh;
690         struct buffer_head *bh;
691
692         mutex_lock(&inode->i_mutex);
693         while (towrite > 0) {
694                 tocopy = sb->s_blocksize - offset < towrite ?
695                                 sb->s_blocksize - offset : towrite;
696
697                 tmp_bh.b_state = 0;
698                 tmp_bh.b_size = 1 << inode->i_blkbits;
699                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
700                 if (err)
701                         goto out;
702                 if (offset || tocopy != sb->s_blocksize)
703                         bh = sb_bread(sb, tmp_bh.b_blocknr);
704                 else
705                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
706                 if (!bh) {
707                         err = -EIO;
708                         goto out;
709                 }
710                 lock_buffer(bh);
711                 memcpy(bh->b_data+offset, data, tocopy);
712                 flush_dcache_page(bh->b_page);
713                 set_buffer_uptodate(bh);
714                 mark_buffer_dirty(bh);
715                 unlock_buffer(bh);
716                 brelse(bh);
717                 offset = 0;
718                 towrite -= tocopy;
719                 data += tocopy;
720                 blk++;
721         }
722 out:
723         if (len == towrite) {
724                 mutex_unlock(&inode->i_mutex);
725                 return err;
726         }
727         if (inode->i_size < off+len-towrite)
728                 i_size_write(inode, off+len-towrite);
729         inode->i_version++;
730         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
731         mark_inode_dirty(inode);
732         mutex_unlock(&inode->i_mutex);
733         return len - towrite;
734 }
735
736 #endif
737
738 static const struct super_operations jfs_super_operations = {
739         .alloc_inode    = jfs_alloc_inode,
740         .destroy_inode  = jfs_destroy_inode,
741         .dirty_inode    = jfs_dirty_inode,
742         .write_inode    = jfs_write_inode,
743         .delete_inode   = jfs_delete_inode,
744         .put_super      = jfs_put_super,
745         .sync_fs        = jfs_sync_fs,
746         .freeze_fs      = jfs_freeze,
747         .unfreeze_fs    = jfs_unfreeze,
748         .statfs         = jfs_statfs,
749         .remount_fs     = jfs_remount,
750         .show_options   = jfs_show_options,
751 #ifdef CONFIG_QUOTA
752         .quota_read     = jfs_quota_read,
753         .quota_write    = jfs_quota_write,
754 #endif
755 };
756
757 static const struct export_operations jfs_export_operations = {
758         .fh_to_dentry   = jfs_fh_to_dentry,
759         .fh_to_parent   = jfs_fh_to_parent,
760         .get_parent     = jfs_get_parent,
761 };
762
763 static struct file_system_type jfs_fs_type = {
764         .owner          = THIS_MODULE,
765         .name           = "jfs",
766         .get_sb         = jfs_get_sb,
767         .kill_sb        = kill_block_super,
768         .fs_flags       = FS_REQUIRES_DEV,
769 };
770
771 static void init_once(void *foo)
772 {
773         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
774
775         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
776         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
777         init_rwsem(&jfs_ip->rdwrlock);
778         mutex_init(&jfs_ip->commit_mutex);
779         init_rwsem(&jfs_ip->xattr_sem);
780         spin_lock_init(&jfs_ip->ag_lock);
781         jfs_ip->active_ag = -1;
782 #ifdef CONFIG_JFS_POSIX_ACL
783         jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
784         jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
785 #endif
786         inode_init_once(&jfs_ip->vfs_inode);
787 }
788
789 static int __init init_jfs_fs(void)
790 {
791         int i;
792         int rc;
793
794         jfs_inode_cachep =
795             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
796                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
797                             init_once);
798         if (jfs_inode_cachep == NULL)
799                 return -ENOMEM;
800
801         /*
802          * Metapage initialization
803          */
804         rc = metapage_init();
805         if (rc) {
806                 jfs_err("metapage_init failed w/rc = %d", rc);
807                 goto free_slab;
808         }
809
810         /*
811          * Transaction Manager initialization
812          */
813         rc = txInit();
814         if (rc) {
815                 jfs_err("txInit failed w/rc = %d", rc);
816                 goto free_metapage;
817         }
818
819         /*
820          * I/O completion thread (endio)
821          */
822         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
823         if (IS_ERR(jfsIOthread)) {
824                 rc = PTR_ERR(jfsIOthread);
825                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
826                 goto end_txmngr;
827         }
828
829         if (commit_threads < 1)
830                 commit_threads = num_online_cpus();
831         if (commit_threads > MAX_COMMIT_THREADS)
832                 commit_threads = MAX_COMMIT_THREADS;
833
834         for (i = 0; i < commit_threads; i++) {
835                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
836                 if (IS_ERR(jfsCommitThread[i])) {
837                         rc = PTR_ERR(jfsCommitThread[i]);
838                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
839                         commit_threads = i;
840                         goto kill_committask;
841                 }
842         }
843
844         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
845         if (IS_ERR(jfsSyncThread)) {
846                 rc = PTR_ERR(jfsSyncThread);
847                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
848                 goto kill_committask;
849         }
850
851 #ifdef PROC_FS_JFS
852         jfs_proc_init();
853 #endif
854
855         return register_filesystem(&jfs_fs_type);
856
857 kill_committask:
858         for (i = 0; i < commit_threads; i++)
859                 kthread_stop(jfsCommitThread[i]);
860         kthread_stop(jfsIOthread);
861 end_txmngr:
862         txExit();
863 free_metapage:
864         metapage_exit();
865 free_slab:
866         kmem_cache_destroy(jfs_inode_cachep);
867         return rc;
868 }
869
870 static void __exit exit_jfs_fs(void)
871 {
872         int i;
873
874         jfs_info("exit_jfs_fs called");
875
876         txExit();
877         metapage_exit();
878
879         kthread_stop(jfsIOthread);
880         for (i = 0; i < commit_threads; i++)
881                 kthread_stop(jfsCommitThread[i]);
882         kthread_stop(jfsSyncThread);
883 #ifdef PROC_FS_JFS
884         jfs_proc_clean();
885 #endif
886         unregister_filesystem(&jfs_fs_type);
887         kmem_cache_destroy(jfs_inode_cachep);
888 }
889
890 module_init(init_jfs_fs)
891 module_exit(exit_jfs_fs)