eCryptfs: Check Tag 11 literal data buffer size
[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/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 #include <linux/smp_lock.h>
36
37 #include "jfs_incore.h"
38 #include "jfs_filsys.h"
39 #include "jfs_inode.h"
40 #include "jfs_metapage.h"
41 #include "jfs_superblock.h"
42 #include "jfs_dmap.h"
43 #include "jfs_imap.h"
44 #include "jfs_acl.h"
45 #include "jfs_debug.h"
46
47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
49 MODULE_LICENSE("GPL");
50
51 static struct kmem_cache * jfs_inode_cachep;
52
53 static const struct super_operations jfs_super_operations;
54 static const struct export_operations jfs_export_operations;
55 static struct file_system_type jfs_fs_type;
56
57 #define MAX_COMMIT_THREADS 64
58 static int commit_threads = 0;
59 module_param(commit_threads, int, 0);
60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
61
62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
63 struct task_struct *jfsIOthread;
64 struct task_struct *jfsSyncThread;
65
66 #ifdef CONFIG_JFS_DEBUG
67 int jfsloglevel = JFS_LOGLEVEL_WARN;
68 module_param(jfsloglevel, int, 0644);
69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
70 #endif
71
72 static void jfs_handle_error(struct super_block *sb)
73 {
74         struct jfs_sb_info *sbi = JFS_SBI(sb);
75
76         if (sb->s_flags & MS_RDONLY)
77                 return;
78
79         updateSuper(sb, FM_DIRTY);
80
81         if (sbi->flag & JFS_ERR_PANIC)
82                 panic("JFS (device %s): panic forced after error\n",
83                         sb->s_id);
84         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
85                 jfs_err("ERROR: (device %s): remounting filesystem "
86                         "as read-only\n",
87                         sb->s_id);
88                 sb->s_flags |= MS_RDONLY;
89         }
90
91         /* nothing is done for continue beyond marking the superblock dirty */
92 }
93
94 void jfs_error(struct super_block *sb, const char * function, ...)
95 {
96         static char error_buf[256];
97         va_list args;
98
99         va_start(args, function);
100         vsnprintf(error_buf, sizeof(error_buf), function, args);
101         va_end(args);
102
103         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
104
105         jfs_handle_error(sb);
106 }
107
108 static struct inode *jfs_alloc_inode(struct super_block *sb)
109 {
110         struct jfs_inode_info *jfs_inode;
111
112         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
113         if (!jfs_inode)
114                 return NULL;
115         return &jfs_inode->vfs_inode;
116 }
117
118 static void jfs_destroy_inode(struct inode *inode)
119 {
120         struct jfs_inode_info *ji = JFS_IP(inode);
121
122         BUG_ON(!list_empty(&ji->anon_inode_list));
123
124         spin_lock_irq(&ji->ag_lock);
125         if (ji->active_ag != -1) {
126                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
127                 atomic_dec(&bmap->db_active[ji->active_ag]);
128                 ji->active_ag = -1;
129         }
130         spin_unlock_irq(&ji->ag_lock);
131         kmem_cache_free(jfs_inode_cachep, ji);
132 }
133
134 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
135 {
136         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
137         s64 maxinodes;
138         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
139
140         jfs_info("In jfs_statfs");
141         buf->f_type = JFS_SUPER_MAGIC;
142         buf->f_bsize = sbi->bsize;
143         buf->f_blocks = sbi->bmap->db_mapsize;
144         buf->f_bfree = sbi->bmap->db_nfree;
145         buf->f_bavail = sbi->bmap->db_nfree;
146         /*
147          * If we really return the number of allocated & free inodes, some
148          * applications will fail because they won't see enough free inodes.
149          * We'll try to calculate some guess as to how may inodes we can
150          * really allocate
151          *
152          * buf->f_files = atomic_read(&imap->im_numinos);
153          * buf->f_ffree = atomic_read(&imap->im_numfree);
154          */
155         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
156                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
157                          << L2INOSPEREXT), (s64) 0xffffffffLL);
158         buf->f_files = maxinodes;
159         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
160                                     atomic_read(&imap->im_numfree));
161         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
162         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
163                                         sizeof(sbi->uuid)/2);
164
165         buf->f_namelen = JFS_NAME_MAX;
166         return 0;
167 }
168
169 static void jfs_put_super(struct super_block *sb)
170 {
171         struct jfs_sb_info *sbi = JFS_SBI(sb);
172         int rc;
173
174         jfs_info("In jfs_put_super");
175
176         lock_kernel();
177
178         rc = jfs_umount(sb);
179         if (rc)
180                 jfs_err("jfs_umount failed with return code %d", rc);
181         if (sbi->nls_tab)
182                 unload_nls(sbi->nls_tab);
183         sbi->nls_tab = NULL;
184
185         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
186         iput(sbi->direct_inode);
187         sbi->direct_inode = NULL;
188
189         kfree(sbi);
190
191         unlock_kernel();
192 }
193
194 enum {
195         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
196         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
197         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
198 };
199
200 static const match_table_t tokens = {
201         {Opt_integrity, "integrity"},
202         {Opt_nointegrity, "nointegrity"},
203         {Opt_iocharset, "iocharset=%s"},
204         {Opt_resize, "resize=%u"},
205         {Opt_resize_nosize, "resize"},
206         {Opt_errors, "errors=%s"},
207         {Opt_ignore, "noquota"},
208         {Opt_ignore, "quota"},
209         {Opt_usrquota, "usrquota"},
210         {Opt_grpquota, "grpquota"},
211         {Opt_uid, "uid=%u"},
212         {Opt_gid, "gid=%u"},
213         {Opt_umask, "umask=%u"},
214         {Opt_err, NULL}
215 };
216
217 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
218                          int *flag)
219 {
220         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
221         char *p;
222         struct jfs_sb_info *sbi = JFS_SBI(sb);
223
224         *newLVSize = 0;
225
226         if (!options)
227                 return 1;
228
229         while ((p = strsep(&options, ",")) != NULL) {
230                 substring_t args[MAX_OPT_ARGS];
231                 int token;
232                 if (!*p)
233                         continue;
234
235                 token = match_token(p, tokens, args);
236                 switch (token) {
237                 case Opt_integrity:
238                         *flag &= ~JFS_NOINTEGRITY;
239                         break;
240                 case Opt_nointegrity:
241                         *flag |= JFS_NOINTEGRITY;
242                         break;
243                 case Opt_ignore:
244                         /* Silently ignore the quota options */
245                         /* Don't do anything ;-) */
246                         break;
247                 case Opt_iocharset:
248                         if (nls_map && nls_map != (void *) -1)
249                                 unload_nls(nls_map);
250                         if (!strcmp(args[0].from, "none"))
251                                 nls_map = NULL;
252                         else {
253                                 nls_map = load_nls(args[0].from);
254                                 if (!nls_map) {
255                                         printk(KERN_ERR
256                                                "JFS: charset not found\n");
257                                         goto cleanup;
258                                 }
259                         }
260                         break;
261                 case Opt_resize:
262                 {
263                         char *resize = args[0].from;
264                         *newLVSize = simple_strtoull(resize, &resize, 0);
265                         break;
266                 }
267                 case Opt_resize_nosize:
268                 {
269                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
270                                 sb->s_blocksize_bits;
271                         if (*newLVSize == 0)
272                                 printk(KERN_ERR
273                                        "JFS: Cannot determine volume size\n");
274                         break;
275                 }
276                 case Opt_errors:
277                 {
278                         char *errors = args[0].from;
279                         if (!errors || !*errors)
280                                 goto cleanup;
281                         if (!strcmp(errors, "continue")) {
282                                 *flag &= ~JFS_ERR_REMOUNT_RO;
283                                 *flag &= ~JFS_ERR_PANIC;
284                                 *flag |= JFS_ERR_CONTINUE;
285                         } else if (!strcmp(errors, "remount-ro")) {
286                                 *flag &= ~JFS_ERR_CONTINUE;
287                                 *flag &= ~JFS_ERR_PANIC;
288                                 *flag |= JFS_ERR_REMOUNT_RO;
289                         } else if (!strcmp(errors, "panic")) {
290                                 *flag &= ~JFS_ERR_CONTINUE;
291                                 *flag &= ~JFS_ERR_REMOUNT_RO;
292                                 *flag |= JFS_ERR_PANIC;
293                         } else {
294                                 printk(KERN_ERR
295                                        "JFS: %s is an invalid error handler\n",
296                                        errors);
297                                 goto cleanup;
298                         }
299                         break;
300                 }
301
302 #ifdef CONFIG_QUOTA
303                 case Opt_quota:
304                 case Opt_usrquota:
305                         *flag |= JFS_USRQUOTA;
306                         break;
307                 case Opt_grpquota:
308                         *flag |= JFS_GRPQUOTA;
309                         break;
310 #else
311                 case Opt_usrquota:
312                 case Opt_grpquota:
313                 case Opt_quota:
314                         printk(KERN_ERR
315                                "JFS: quota operations not supported\n");
316                         break;
317 #endif
318                 case Opt_uid:
319                 {
320                         char *uid = args[0].from;
321                         sbi->uid = simple_strtoul(uid, &uid, 0);
322                         break;
323                 }
324                 case Opt_gid:
325                 {
326                         char *gid = args[0].from;
327                         sbi->gid = simple_strtoul(gid, &gid, 0);
328                         break;
329                 }
330                 case Opt_umask:
331                 {
332                         char *umask = args[0].from;
333                         sbi->umask = simple_strtoul(umask, &umask, 8);
334                         if (sbi->umask & ~0777) {
335                                 printk(KERN_ERR
336                                        "JFS: Invalid value of umask\n");
337                                 goto cleanup;
338                         }
339                         break;
340                 }
341                 default:
342                         printk("jfs: Unrecognized mount option \"%s\" "
343                                         " or missing value\n", p);
344                         goto cleanup;
345                 }
346         }
347
348         if (nls_map != (void *) -1) {
349                 /* Discard old (if remount) */
350                 if (sbi->nls_tab)
351                         unload_nls(sbi->nls_tab);
352                 sbi->nls_tab = nls_map;
353         }
354         return 1;
355
356 cleanup:
357         if (nls_map && nls_map != (void *) -1)
358                 unload_nls(nls_map);
359         return 0;
360 }
361
362 static int jfs_remount(struct super_block *sb, int *flags, char *data)
363 {
364         s64 newLVSize = 0;
365         int rc = 0;
366         int flag = JFS_SBI(sb)->flag;
367         int ret;
368
369         if (!parse_options(data, sb, &newLVSize, &flag)) {
370                 return -EINVAL;
371         }
372         lock_kernel();
373         if (newLVSize) {
374                 if (sb->s_flags & MS_RDONLY) {
375                         printk(KERN_ERR
376                   "JFS: resize requires volume to be mounted read-write\n");
377                         unlock_kernel();
378                         return -EROFS;
379                 }
380                 rc = jfs_extendfs(sb, newLVSize, 0);
381                 if (rc) {
382                         unlock_kernel();
383                         return rc;
384                 }
385         }
386
387         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
388                 /*
389                  * Invalidate any previously read metadata.  fsck may have
390                  * changed the on-disk data since we mounted r/o
391                  */
392                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
393
394                 JFS_SBI(sb)->flag = flag;
395                 ret = jfs_mount_rw(sb, 1);
396                 unlock_kernel();
397                 return ret;
398         }
399         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
400                 rc = jfs_umount_rw(sb);
401                 JFS_SBI(sb)->flag = flag;
402                 unlock_kernel();
403                 return rc;
404         }
405         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
406                 if (!(sb->s_flags & MS_RDONLY)) {
407                         rc = jfs_umount_rw(sb);
408                         if (rc) {
409                                 unlock_kernel();
410                                 return rc;
411                         }
412                         JFS_SBI(sb)->flag = flag;
413                         ret = jfs_mount_rw(sb, 1);
414                         unlock_kernel();
415                         return ret;
416                 }
417         JFS_SBI(sb)->flag = flag;
418
419         unlock_kernel();
420         return 0;
421 }
422
423 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
424 {
425         struct jfs_sb_info *sbi;
426         struct inode *inode;
427         int rc;
428         s64 newLVSize = 0;
429         int flag, ret = -EINVAL;
430
431         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
432
433         if (!new_valid_dev(sb->s_bdev->bd_dev))
434                 return -EOVERFLOW;
435
436         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
437         if (!sbi)
438                 return -ENOMEM;
439         sb->s_fs_info = sbi;
440         sbi->sb = sb;
441         sbi->uid = sbi->gid = sbi->umask = -1;
442
443         /* initialize the mount flag and determine the default error handler */
444         flag = JFS_ERR_REMOUNT_RO;
445
446         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
447                 kfree(sbi);
448                 return -EINVAL;
449         }
450         sbi->flag = flag;
451
452 #ifdef CONFIG_JFS_POSIX_ACL
453         sb->s_flags |= MS_POSIXACL;
454 #endif
455
456         if (newLVSize) {
457                 printk(KERN_ERR "resize option for remount only\n");
458                 return -EINVAL;
459         }
460
461         /*
462          * Initialize blocksize to 4K.
463          */
464         sb_set_blocksize(sb, PSIZE);
465
466         /*
467          * Set method vectors.
468          */
469         sb->s_op = &jfs_super_operations;
470         sb->s_export_op = &jfs_export_operations;
471
472         /*
473          * Initialize direct-mapping inode/address-space
474          */
475         inode = new_inode(sb);
476         if (inode == NULL) {
477                 ret = -ENOMEM;
478                 goto out_kfree;
479         }
480         inode->i_ino = 0;
481         inode->i_nlink = 1;
482         inode->i_size = sb->s_bdev->bd_inode->i_size;
483         inode->i_mapping->a_ops = &jfs_metapage_aops;
484         insert_inode_hash(inode);
485         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
486
487         sbi->direct_inode = inode;
488
489         rc = jfs_mount(sb);
490         if (rc) {
491                 if (!silent) {
492                         jfs_err("jfs_mount failed w/return code = %d", rc);
493                 }
494                 goto out_mount_failed;
495         }
496         if (sb->s_flags & MS_RDONLY)
497                 sbi->log = NULL;
498         else {
499                 rc = jfs_mount_rw(sb, 0);
500                 if (rc) {
501                         if (!silent) {
502                                 jfs_err("jfs_mount_rw failed, return code = %d",
503                                         rc);
504                         }
505                         goto out_no_rw;
506                 }
507         }
508
509         sb->s_magic = JFS_SUPER_MAGIC;
510
511         inode = jfs_iget(sb, ROOT_I);
512         if (IS_ERR(inode)) {
513                 ret = PTR_ERR(inode);
514                 goto out_no_rw;
515         }
516         sb->s_root = d_alloc_root(inode);
517         if (!sb->s_root)
518                 goto out_no_root;
519
520         if (sbi->mntflag & JFS_OS2)
521                 sb->s_root->d_op = &jfs_ci_dentry_operations;
522
523         /* logical blocks are represented by 40 bits in pxd_t, etc. */
524         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
525 #if BITS_PER_LONG == 32
526         /*
527          * Page cache is indexed by long.
528          * I would use MAX_LFS_FILESIZE, but it's only half as big
529          */
530         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
531 #endif
532         sb->s_time_gran = 1;
533         return 0;
534
535 out_no_root:
536         jfs_err("jfs_read_super: get root dentry failed");
537         iput(inode);
538
539 out_no_rw:
540         rc = jfs_umount(sb);
541         if (rc) {
542                 jfs_err("jfs_umount failed with return code %d", rc);
543         }
544 out_mount_failed:
545         filemap_write_and_wait(sbi->direct_inode->i_mapping);
546         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
547         make_bad_inode(sbi->direct_inode);
548         iput(sbi->direct_inode);
549         sbi->direct_inode = NULL;
550 out_kfree:
551         if (sbi->nls_tab)
552                 unload_nls(sbi->nls_tab);
553         kfree(sbi);
554         return ret;
555 }
556
557 static int jfs_freeze(struct super_block *sb)
558 {
559         struct jfs_sb_info *sbi = JFS_SBI(sb);
560         struct jfs_log *log = sbi->log;
561
562         if (!(sb->s_flags & MS_RDONLY)) {
563                 txQuiesce(sb);
564                 lmLogShutdown(log);
565                 updateSuper(sb, FM_CLEAN);
566         }
567         return 0;
568 }
569
570 static int jfs_unfreeze(struct super_block *sb)
571 {
572         struct jfs_sb_info *sbi = JFS_SBI(sb);
573         struct jfs_log *log = sbi->log;
574         int rc = 0;
575
576         if (!(sb->s_flags & MS_RDONLY)) {
577                 updateSuper(sb, FM_MOUNT);
578                 if ((rc = lmLogInit(log)))
579                         jfs_err("jfs_unlock failed with return code %d", rc);
580                 else
581                         txResume(sb);
582         }
583         return 0;
584 }
585
586 static int jfs_get_sb(struct file_system_type *fs_type,
587         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
588 {
589         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
590                            mnt);
591 }
592
593 static int jfs_sync_fs(struct super_block *sb, int wait)
594 {
595         struct jfs_log *log = JFS_SBI(sb)->log;
596
597         /* log == NULL indicates read-only mount */
598         if (log) {
599                 jfs_flush_journal(log, wait);
600                 jfs_syncpt(log, 0);
601         }
602
603         return 0;
604 }
605
606 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
607 {
608         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
609
610         if (sbi->uid != -1)
611                 seq_printf(seq, ",uid=%d", sbi->uid);
612         if (sbi->gid != -1)
613                 seq_printf(seq, ",gid=%d", sbi->gid);
614         if (sbi->umask != -1)
615                 seq_printf(seq, ",umask=%03o", sbi->umask);
616         if (sbi->flag & JFS_NOINTEGRITY)
617                 seq_puts(seq, ",nointegrity");
618         if (sbi->nls_tab)
619                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
620         if (sbi->flag & JFS_ERR_CONTINUE)
621                 seq_printf(seq, ",errors=continue");
622         if (sbi->flag & JFS_ERR_PANIC)
623                 seq_printf(seq, ",errors=panic");
624
625 #ifdef CONFIG_QUOTA
626         if (sbi->flag & JFS_USRQUOTA)
627                 seq_puts(seq, ",usrquota");
628
629         if (sbi->flag & JFS_GRPQUOTA)
630                 seq_puts(seq, ",grpquota");
631 #endif
632
633         return 0;
634 }
635
636 #ifdef CONFIG_QUOTA
637
638 /* Read data from quotafile - avoid pagecache and such because we cannot afford
639  * acquiring the locks... As quota files are never truncated and quota code
640  * itself serializes the operations (and noone else should touch the files)
641  * we don't have to be afraid of races */
642 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
643                               size_t len, loff_t off)
644 {
645         struct inode *inode = sb_dqopt(sb)->files[type];
646         sector_t blk = off >> sb->s_blocksize_bits;
647         int err = 0;
648         int offset = off & (sb->s_blocksize - 1);
649         int tocopy;
650         size_t toread;
651         struct buffer_head tmp_bh;
652         struct buffer_head *bh;
653         loff_t i_size = i_size_read(inode);
654
655         if (off > i_size)
656                 return 0;
657         if (off+len > i_size)
658                 len = i_size-off;
659         toread = len;
660         while (toread > 0) {
661                 tocopy = sb->s_blocksize - offset < toread ?
662                                 sb->s_blocksize - offset : toread;
663
664                 tmp_bh.b_state = 0;
665                 tmp_bh.b_size = 1 << inode->i_blkbits;
666                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
667                 if (err)
668                         return err;
669                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
670                         memset(data, 0, tocopy);
671                 else {
672                         bh = sb_bread(sb, tmp_bh.b_blocknr);
673                         if (!bh)
674                                 return -EIO;
675                         memcpy(data, bh->b_data+offset, tocopy);
676                         brelse(bh);
677                 }
678                 offset = 0;
679                 toread -= tocopy;
680                 data += tocopy;
681                 blk++;
682         }
683         return len;
684 }
685
686 /* Write to quotafile */
687 static ssize_t jfs_quota_write(struct super_block *sb, int type,
688                                const char *data, size_t len, loff_t off)
689 {
690         struct inode *inode = sb_dqopt(sb)->files[type];
691         sector_t blk = off >> sb->s_blocksize_bits;
692         int err = 0;
693         int offset = off & (sb->s_blocksize - 1);
694         int tocopy;
695         size_t towrite = len;
696         struct buffer_head tmp_bh;
697         struct buffer_head *bh;
698
699         mutex_lock(&inode->i_mutex);
700         while (towrite > 0) {
701                 tocopy = sb->s_blocksize - offset < towrite ?
702                                 sb->s_blocksize - offset : towrite;
703
704                 tmp_bh.b_state = 0;
705                 tmp_bh.b_size = 1 << inode->i_blkbits;
706                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
707                 if (err)
708                         goto out;
709                 if (offset || tocopy != sb->s_blocksize)
710                         bh = sb_bread(sb, tmp_bh.b_blocknr);
711                 else
712                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
713                 if (!bh) {
714                         err = -EIO;
715                         goto out;
716                 }
717                 lock_buffer(bh);
718                 memcpy(bh->b_data+offset, data, tocopy);
719                 flush_dcache_page(bh->b_page);
720                 set_buffer_uptodate(bh);
721                 mark_buffer_dirty(bh);
722                 unlock_buffer(bh);
723                 brelse(bh);
724                 offset = 0;
725                 towrite -= tocopy;
726                 data += tocopy;
727                 blk++;
728         }
729 out:
730         if (len == towrite) {
731                 mutex_unlock(&inode->i_mutex);
732                 return err;
733         }
734         if (inode->i_size < off+len-towrite)
735                 i_size_write(inode, off+len-towrite);
736         inode->i_version++;
737         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
738         mark_inode_dirty(inode);
739         mutex_unlock(&inode->i_mutex);
740         return len - towrite;
741 }
742
743 #endif
744
745 static const struct super_operations jfs_super_operations = {
746         .alloc_inode    = jfs_alloc_inode,
747         .destroy_inode  = jfs_destroy_inode,
748         .dirty_inode    = jfs_dirty_inode,
749         .write_inode    = jfs_write_inode,
750         .delete_inode   = jfs_delete_inode,
751         .put_super      = jfs_put_super,
752         .sync_fs        = jfs_sync_fs,
753         .freeze_fs      = jfs_freeze,
754         .unfreeze_fs    = jfs_unfreeze,
755         .statfs         = jfs_statfs,
756         .remount_fs     = jfs_remount,
757         .show_options   = jfs_show_options,
758 #ifdef CONFIG_QUOTA
759         .quota_read     = jfs_quota_read,
760         .quota_write    = jfs_quota_write,
761 #endif
762 };
763
764 static const struct export_operations jfs_export_operations = {
765         .fh_to_dentry   = jfs_fh_to_dentry,
766         .fh_to_parent   = jfs_fh_to_parent,
767         .get_parent     = jfs_get_parent,
768 };
769
770 static struct file_system_type jfs_fs_type = {
771         .owner          = THIS_MODULE,
772         .name           = "jfs",
773         .get_sb         = jfs_get_sb,
774         .kill_sb        = kill_block_super,
775         .fs_flags       = FS_REQUIRES_DEV,
776 };
777
778 static void init_once(void *foo)
779 {
780         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
781
782         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
783         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
784         init_rwsem(&jfs_ip->rdwrlock);
785         mutex_init(&jfs_ip->commit_mutex);
786         init_rwsem(&jfs_ip->xattr_sem);
787         spin_lock_init(&jfs_ip->ag_lock);
788         jfs_ip->active_ag = -1;
789         inode_init_once(&jfs_ip->vfs_inode);
790 }
791
792 static int __init init_jfs_fs(void)
793 {
794         int i;
795         int rc;
796
797         jfs_inode_cachep =
798             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
799                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
800                             init_once);
801         if (jfs_inode_cachep == NULL)
802                 return -ENOMEM;
803
804         /*
805          * Metapage initialization
806          */
807         rc = metapage_init();
808         if (rc) {
809                 jfs_err("metapage_init failed w/rc = %d", rc);
810                 goto free_slab;
811         }
812
813         /*
814          * Transaction Manager initialization
815          */
816         rc = txInit();
817         if (rc) {
818                 jfs_err("txInit failed w/rc = %d", rc);
819                 goto free_metapage;
820         }
821
822         /*
823          * I/O completion thread (endio)
824          */
825         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
826         if (IS_ERR(jfsIOthread)) {
827                 rc = PTR_ERR(jfsIOthread);
828                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
829                 goto end_txmngr;
830         }
831
832         if (commit_threads < 1)
833                 commit_threads = num_online_cpus();
834         if (commit_threads > MAX_COMMIT_THREADS)
835                 commit_threads = MAX_COMMIT_THREADS;
836
837         for (i = 0; i < commit_threads; i++) {
838                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
839                 if (IS_ERR(jfsCommitThread[i])) {
840                         rc = PTR_ERR(jfsCommitThread[i]);
841                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
842                         commit_threads = i;
843                         goto kill_committask;
844                 }
845         }
846
847         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
848         if (IS_ERR(jfsSyncThread)) {
849                 rc = PTR_ERR(jfsSyncThread);
850                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
851                 goto kill_committask;
852         }
853
854 #ifdef PROC_FS_JFS
855         jfs_proc_init();
856 #endif
857
858         return register_filesystem(&jfs_fs_type);
859
860 kill_committask:
861         for (i = 0; i < commit_threads; i++)
862                 kthread_stop(jfsCommitThread[i]);
863         kthread_stop(jfsIOthread);
864 end_txmngr:
865         txExit();
866 free_metapage:
867         metapage_exit();
868 free_slab:
869         kmem_cache_destroy(jfs_inode_cachep);
870         return rc;
871 }
872
873 static void __exit exit_jfs_fs(void)
874 {
875         int i;
876
877         jfs_info("exit_jfs_fs called");
878
879         txExit();
880         metapage_exit();
881
882         kthread_stop(jfsIOthread);
883         for (i = 0; i < commit_threads; i++)
884                 kthread_stop(jfsCommitThread[i]);
885         kthread_stop(jfsSyncThread);
886 #ifdef PROC_FS_JFS
887         jfs_proc_clean();
888 #endif
889         unregister_filesystem(&jfs_fs_type);
890         kmem_cache_destroy(jfs_inode_cachep);
891 }
892
893 module_init(init_jfs_fs)
894 module_exit(exit_jfs_fs)