dquot: cleanup dquot drop routine
[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 void jfs_clear_inode(struct inode *inode)
135 {
136         dquot_drop(inode);
137 }
138
139 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
140 {
141         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
142         s64 maxinodes;
143         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
144
145         jfs_info("In jfs_statfs");
146         buf->f_type = JFS_SUPER_MAGIC;
147         buf->f_bsize = sbi->bsize;
148         buf->f_blocks = sbi->bmap->db_mapsize;
149         buf->f_bfree = sbi->bmap->db_nfree;
150         buf->f_bavail = sbi->bmap->db_nfree;
151         /*
152          * If we really return the number of allocated & free inodes, some
153          * applications will fail because they won't see enough free inodes.
154          * We'll try to calculate some guess as to how may inodes we can
155          * really allocate
156          *
157          * buf->f_files = atomic_read(&imap->im_numinos);
158          * buf->f_ffree = atomic_read(&imap->im_numfree);
159          */
160         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
161                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
162                          << L2INOSPEREXT), (s64) 0xffffffffLL);
163         buf->f_files = maxinodes;
164         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
165                                     atomic_read(&imap->im_numfree));
166         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
167         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
168                                         sizeof(sbi->uuid)/2);
169
170         buf->f_namelen = JFS_NAME_MAX;
171         return 0;
172 }
173
174 static void jfs_put_super(struct super_block *sb)
175 {
176         struct jfs_sb_info *sbi = JFS_SBI(sb);
177         int rc;
178
179         jfs_info("In jfs_put_super");
180
181         lock_kernel();
182
183         rc = jfs_umount(sb);
184         if (rc)
185                 jfs_err("jfs_umount failed with return code %d", rc);
186
187         unload_nls(sbi->nls_tab);
188
189         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
190         iput(sbi->direct_inode);
191
192         kfree(sbi);
193
194         unlock_kernel();
195 }
196
197 enum {
198         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
199         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
200         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
201 };
202
203 static const match_table_t tokens = {
204         {Opt_integrity, "integrity"},
205         {Opt_nointegrity, "nointegrity"},
206         {Opt_iocharset, "iocharset=%s"},
207         {Opt_resize, "resize=%u"},
208         {Opt_resize_nosize, "resize"},
209         {Opt_errors, "errors=%s"},
210         {Opt_ignore, "noquota"},
211         {Opt_ignore, "quota"},
212         {Opt_usrquota, "usrquota"},
213         {Opt_grpquota, "grpquota"},
214         {Opt_uid, "uid=%u"},
215         {Opt_gid, "gid=%u"},
216         {Opt_umask, "umask=%u"},
217         {Opt_err, NULL}
218 };
219
220 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
221                          int *flag)
222 {
223         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
224         char *p;
225         struct jfs_sb_info *sbi = JFS_SBI(sb);
226
227         *newLVSize = 0;
228
229         if (!options)
230                 return 1;
231
232         while ((p = strsep(&options, ",")) != NULL) {
233                 substring_t args[MAX_OPT_ARGS];
234                 int token;
235                 if (!*p)
236                         continue;
237
238                 token = match_token(p, tokens, args);
239                 switch (token) {
240                 case Opt_integrity:
241                         *flag &= ~JFS_NOINTEGRITY;
242                         break;
243                 case Opt_nointegrity:
244                         *flag |= JFS_NOINTEGRITY;
245                         break;
246                 case Opt_ignore:
247                         /* Silently ignore the quota options */
248                         /* Don't do anything ;-) */
249                         break;
250                 case Opt_iocharset:
251                         if (nls_map && nls_map != (void *) -1)
252                                 unload_nls(nls_map);
253                         if (!strcmp(args[0].from, "none"))
254                                 nls_map = NULL;
255                         else {
256                                 nls_map = load_nls(args[0].from);
257                                 if (!nls_map) {
258                                         printk(KERN_ERR
259                                                "JFS: charset not found\n");
260                                         goto cleanup;
261                                 }
262                         }
263                         break;
264                 case Opt_resize:
265                 {
266                         char *resize = args[0].from;
267                         *newLVSize = simple_strtoull(resize, &resize, 0);
268                         break;
269                 }
270                 case Opt_resize_nosize:
271                 {
272                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
273                                 sb->s_blocksize_bits;
274                         if (*newLVSize == 0)
275                                 printk(KERN_ERR
276                                        "JFS: Cannot determine volume size\n");
277                         break;
278                 }
279                 case Opt_errors:
280                 {
281                         char *errors = args[0].from;
282                         if (!errors || !*errors)
283                                 goto cleanup;
284                         if (!strcmp(errors, "continue")) {
285                                 *flag &= ~JFS_ERR_REMOUNT_RO;
286                                 *flag &= ~JFS_ERR_PANIC;
287                                 *flag |= JFS_ERR_CONTINUE;
288                         } else if (!strcmp(errors, "remount-ro")) {
289                                 *flag &= ~JFS_ERR_CONTINUE;
290                                 *flag &= ~JFS_ERR_PANIC;
291                                 *flag |= JFS_ERR_REMOUNT_RO;
292                         } else if (!strcmp(errors, "panic")) {
293                                 *flag &= ~JFS_ERR_CONTINUE;
294                                 *flag &= ~JFS_ERR_REMOUNT_RO;
295                                 *flag |= JFS_ERR_PANIC;
296                         } else {
297                                 printk(KERN_ERR
298                                        "JFS: %s is an invalid error handler\n",
299                                        errors);
300                                 goto cleanup;
301                         }
302                         break;
303                 }
304
305 #ifdef CONFIG_QUOTA
306                 case Opt_quota:
307                 case Opt_usrquota:
308                         *flag |= JFS_USRQUOTA;
309                         break;
310                 case Opt_grpquota:
311                         *flag |= JFS_GRPQUOTA;
312                         break;
313 #else
314                 case Opt_usrquota:
315                 case Opt_grpquota:
316                 case Opt_quota:
317                         printk(KERN_ERR
318                                "JFS: quota operations not supported\n");
319                         break;
320 #endif
321                 case Opt_uid:
322                 {
323                         char *uid = args[0].from;
324                         sbi->uid = simple_strtoul(uid, &uid, 0);
325                         break;
326                 }
327                 case Opt_gid:
328                 {
329                         char *gid = args[0].from;
330                         sbi->gid = simple_strtoul(gid, &gid, 0);
331                         break;
332                 }
333                 case Opt_umask:
334                 {
335                         char *umask = args[0].from;
336                         sbi->umask = simple_strtoul(umask, &umask, 8);
337                         if (sbi->umask & ~0777) {
338                                 printk(KERN_ERR
339                                        "JFS: Invalid value of umask\n");
340                                 goto cleanup;
341                         }
342                         break;
343                 }
344                 default:
345                         printk("jfs: Unrecognized mount option \"%s\" "
346                                         " or missing value\n", p);
347                         goto cleanup;
348                 }
349         }
350
351         if (nls_map != (void *) -1) {
352                 /* Discard old (if remount) */
353                 unload_nls(sbi->nls_tab);
354                 sbi->nls_tab = nls_map;
355         }
356         return 1;
357
358 cleanup:
359         if (nls_map && nls_map != (void *) -1)
360                 unload_nls(nls_map);
361         return 0;
362 }
363
364 static int jfs_remount(struct super_block *sb, int *flags, char *data)
365 {
366         s64 newLVSize = 0;
367         int rc = 0;
368         int flag = JFS_SBI(sb)->flag;
369         int ret;
370
371         if (!parse_options(data, sb, &newLVSize, &flag)) {
372                 return -EINVAL;
373         }
374         lock_kernel();
375         if (newLVSize) {
376                 if (sb->s_flags & MS_RDONLY) {
377                         printk(KERN_ERR
378                   "JFS: resize requires volume to be mounted read-write\n");
379                         unlock_kernel();
380                         return -EROFS;
381                 }
382                 rc = jfs_extendfs(sb, newLVSize, 0);
383                 if (rc) {
384                         unlock_kernel();
385                         return rc;
386                 }
387         }
388
389         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
390                 /*
391                  * Invalidate any previously read metadata.  fsck may have
392                  * changed the on-disk data since we mounted r/o
393                  */
394                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
395
396                 JFS_SBI(sb)->flag = flag;
397                 ret = jfs_mount_rw(sb, 1);
398                 unlock_kernel();
399                 return ret;
400         }
401         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
402                 rc = jfs_umount_rw(sb);
403                 JFS_SBI(sb)->flag = flag;
404                 unlock_kernel();
405                 return rc;
406         }
407         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
408                 if (!(sb->s_flags & MS_RDONLY)) {
409                         rc = jfs_umount_rw(sb);
410                         if (rc) {
411                                 unlock_kernel();
412                                 return rc;
413                         }
414                         JFS_SBI(sb)->flag = flag;
415                         ret = jfs_mount_rw(sb, 1);
416                         unlock_kernel();
417                         return ret;
418                 }
419         JFS_SBI(sb)->flag = flag;
420
421         unlock_kernel();
422         return 0;
423 }
424
425 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
426 {
427         struct jfs_sb_info *sbi;
428         struct inode *inode;
429         int rc;
430         s64 newLVSize = 0;
431         int flag, ret = -EINVAL;
432
433         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
434
435         if (!new_valid_dev(sb->s_bdev->bd_dev))
436                 return -EOVERFLOW;
437
438         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
439         if (!sbi)
440                 return -ENOMEM;
441         sb->s_fs_info = sbi;
442         sbi->sb = sb;
443         sbi->uid = sbi->gid = sbi->umask = -1;
444
445         /* initialize the mount flag and determine the default error handler */
446         flag = JFS_ERR_REMOUNT_RO;
447
448         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
449                 kfree(sbi);
450                 return -EINVAL;
451         }
452         sbi->flag = flag;
453
454 #ifdef CONFIG_JFS_POSIX_ACL
455         sb->s_flags |= MS_POSIXACL;
456 #endif
457
458         if (newLVSize) {
459                 printk(KERN_ERR "resize option for remount only\n");
460                 return -EINVAL;
461         }
462
463         /*
464          * Initialize blocksize to 4K.
465          */
466         sb_set_blocksize(sb, PSIZE);
467
468         /*
469          * Set method vectors.
470          */
471         sb->s_op = &jfs_super_operations;
472         sb->s_export_op = &jfs_export_operations;
473
474         /*
475          * Initialize direct-mapping inode/address-space
476          */
477         inode = new_inode(sb);
478         if (inode == NULL) {
479                 ret = -ENOMEM;
480                 goto out_kfree;
481         }
482         inode->i_ino = 0;
483         inode->i_nlink = 1;
484         inode->i_size = sb->s_bdev->bd_inode->i_size;
485         inode->i_mapping->a_ops = &jfs_metapage_aops;
486         insert_inode_hash(inode);
487         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
488
489         sbi->direct_inode = inode;
490
491         rc = jfs_mount(sb);
492         if (rc) {
493                 if (!silent) {
494                         jfs_err("jfs_mount failed w/return code = %d", rc);
495                 }
496                 goto out_mount_failed;
497         }
498         if (sb->s_flags & MS_RDONLY)
499                 sbi->log = NULL;
500         else {
501                 rc = jfs_mount_rw(sb, 0);
502                 if (rc) {
503                         if (!silent) {
504                                 jfs_err("jfs_mount_rw failed, return code = %d",
505                                         rc);
506                         }
507                         goto out_no_rw;
508                 }
509         }
510
511         sb->s_magic = JFS_SUPER_MAGIC;
512
513         inode = jfs_iget(sb, ROOT_I);
514         if (IS_ERR(inode)) {
515                 ret = PTR_ERR(inode);
516                 goto out_no_rw;
517         }
518         sb->s_root = d_alloc_root(inode);
519         if (!sb->s_root)
520                 goto out_no_root;
521
522         if (sbi->mntflag & JFS_OS2)
523                 sb->s_root->d_op = &jfs_ci_dentry_operations;
524
525         /* logical blocks are represented by 40 bits in pxd_t, etc. */
526         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
527 #if BITS_PER_LONG == 32
528         /*
529          * Page cache is indexed by long.
530          * I would use MAX_LFS_FILESIZE, but it's only half as big
531          */
532         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
533 #endif
534         sb->s_time_gran = 1;
535         return 0;
536
537 out_no_root:
538         jfs_err("jfs_read_super: get root dentry failed");
539         iput(inode);
540
541 out_no_rw:
542         rc = jfs_umount(sb);
543         if (rc) {
544                 jfs_err("jfs_umount failed with return code %d", rc);
545         }
546 out_mount_failed:
547         filemap_write_and_wait(sbi->direct_inode->i_mapping);
548         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
549         make_bad_inode(sbi->direct_inode);
550         iput(sbi->direct_inode);
551         sbi->direct_inode = NULL;
552 out_kfree:
553         if (sbi->nls_tab)
554                 unload_nls(sbi->nls_tab);
555         kfree(sbi);
556         return ret;
557 }
558
559 static int jfs_freeze(struct super_block *sb)
560 {
561         struct jfs_sb_info *sbi = JFS_SBI(sb);
562         struct jfs_log *log = sbi->log;
563
564         if (!(sb->s_flags & MS_RDONLY)) {
565                 txQuiesce(sb);
566                 lmLogShutdown(log);
567                 updateSuper(sb, FM_CLEAN);
568         }
569         return 0;
570 }
571
572 static int jfs_unfreeze(struct super_block *sb)
573 {
574         struct jfs_sb_info *sbi = JFS_SBI(sb);
575         struct jfs_log *log = sbi->log;
576         int rc = 0;
577
578         if (!(sb->s_flags & MS_RDONLY)) {
579                 updateSuper(sb, FM_MOUNT);
580                 if ((rc = lmLogInit(log)))
581                         jfs_err("jfs_unlock failed with return code %d", rc);
582                 else
583                         txResume(sb);
584         }
585         return 0;
586 }
587
588 static int jfs_get_sb(struct file_system_type *fs_type,
589         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
590 {
591         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
592                            mnt);
593 }
594
595 static int jfs_sync_fs(struct super_block *sb, int wait)
596 {
597         struct jfs_log *log = JFS_SBI(sb)->log;
598
599         /* log == NULL indicates read-only mount */
600         if (log) {
601                 jfs_flush_journal(log, wait);
602                 jfs_syncpt(log, 0);
603         }
604
605         return 0;
606 }
607
608 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
609 {
610         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
611
612         if (sbi->uid != -1)
613                 seq_printf(seq, ",uid=%d", sbi->uid);
614         if (sbi->gid != -1)
615                 seq_printf(seq, ",gid=%d", sbi->gid);
616         if (sbi->umask != -1)
617                 seq_printf(seq, ",umask=%03o", sbi->umask);
618         if (sbi->flag & JFS_NOINTEGRITY)
619                 seq_puts(seq, ",nointegrity");
620         if (sbi->nls_tab)
621                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
622         if (sbi->flag & JFS_ERR_CONTINUE)
623                 seq_printf(seq, ",errors=continue");
624         if (sbi->flag & JFS_ERR_PANIC)
625                 seq_printf(seq, ",errors=panic");
626
627 #ifdef CONFIG_QUOTA
628         if (sbi->flag & JFS_USRQUOTA)
629                 seq_puts(seq, ",usrquota");
630
631         if (sbi->flag & JFS_GRPQUOTA)
632                 seq_puts(seq, ",grpquota");
633 #endif
634
635         return 0;
636 }
637
638 #ifdef CONFIG_QUOTA
639
640 /* Read data from quotafile - avoid pagecache and such because we cannot afford
641  * acquiring the locks... As quota files are never truncated and quota code
642  * itself serializes the operations (and noone else should touch the files)
643  * we don't have to be afraid of races */
644 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
645                               size_t len, loff_t off)
646 {
647         struct inode *inode = sb_dqopt(sb)->files[type];
648         sector_t blk = off >> sb->s_blocksize_bits;
649         int err = 0;
650         int offset = off & (sb->s_blocksize - 1);
651         int tocopy;
652         size_t toread;
653         struct buffer_head tmp_bh;
654         struct buffer_head *bh;
655         loff_t i_size = i_size_read(inode);
656
657         if (off > i_size)
658                 return 0;
659         if (off+len > i_size)
660                 len = i_size-off;
661         toread = len;
662         while (toread > 0) {
663                 tocopy = sb->s_blocksize - offset < toread ?
664                                 sb->s_blocksize - offset : toread;
665
666                 tmp_bh.b_state = 0;
667                 tmp_bh.b_size = 1 << inode->i_blkbits;
668                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
669                 if (err)
670                         return err;
671                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
672                         memset(data, 0, tocopy);
673                 else {
674                         bh = sb_bread(sb, tmp_bh.b_blocknr);
675                         if (!bh)
676                                 return -EIO;
677                         memcpy(data, bh->b_data+offset, tocopy);
678                         brelse(bh);
679                 }
680                 offset = 0;
681                 toread -= tocopy;
682                 data += tocopy;
683                 blk++;
684         }
685         return len;
686 }
687
688 /* Write to quotafile */
689 static ssize_t jfs_quota_write(struct super_block *sb, int type,
690                                const char *data, size_t len, loff_t off)
691 {
692         struct inode *inode = sb_dqopt(sb)->files[type];
693         sector_t blk = off >> sb->s_blocksize_bits;
694         int err = 0;
695         int offset = off & (sb->s_blocksize - 1);
696         int tocopy;
697         size_t towrite = len;
698         struct buffer_head tmp_bh;
699         struct buffer_head *bh;
700
701         mutex_lock(&inode->i_mutex);
702         while (towrite > 0) {
703                 tocopy = sb->s_blocksize - offset < towrite ?
704                                 sb->s_blocksize - offset : towrite;
705
706                 tmp_bh.b_state = 0;
707                 tmp_bh.b_size = 1 << inode->i_blkbits;
708                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
709                 if (err)
710                         goto out;
711                 if (offset || tocopy != sb->s_blocksize)
712                         bh = sb_bread(sb, tmp_bh.b_blocknr);
713                 else
714                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
715                 if (!bh) {
716                         err = -EIO;
717                         goto out;
718                 }
719                 lock_buffer(bh);
720                 memcpy(bh->b_data+offset, data, tocopy);
721                 flush_dcache_page(bh->b_page);
722                 set_buffer_uptodate(bh);
723                 mark_buffer_dirty(bh);
724                 unlock_buffer(bh);
725                 brelse(bh);
726                 offset = 0;
727                 towrite -= tocopy;
728                 data += tocopy;
729                 blk++;
730         }
731 out:
732         if (len == towrite) {
733                 mutex_unlock(&inode->i_mutex);
734                 return err;
735         }
736         if (inode->i_size < off+len-towrite)
737                 i_size_write(inode, off+len-towrite);
738         inode->i_version++;
739         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
740         mark_inode_dirty(inode);
741         mutex_unlock(&inode->i_mutex);
742         return len - towrite;
743 }
744
745 #endif
746
747 static const struct super_operations jfs_super_operations = {
748         .alloc_inode    = jfs_alloc_inode,
749         .destroy_inode  = jfs_destroy_inode,
750         .dirty_inode    = jfs_dirty_inode,
751         .write_inode    = jfs_write_inode,
752         .delete_inode   = jfs_delete_inode,
753         .clear_inode    = jfs_clear_inode,
754         .put_super      = jfs_put_super,
755         .sync_fs        = jfs_sync_fs,
756         .freeze_fs      = jfs_freeze,
757         .unfreeze_fs    = jfs_unfreeze,
758         .statfs         = jfs_statfs,
759         .remount_fs     = jfs_remount,
760         .show_options   = jfs_show_options,
761 #ifdef CONFIG_QUOTA
762         .quota_read     = jfs_quota_read,
763         .quota_write    = jfs_quota_write,
764 #endif
765 };
766
767 static const struct export_operations jfs_export_operations = {
768         .fh_to_dentry   = jfs_fh_to_dentry,
769         .fh_to_parent   = jfs_fh_to_parent,
770         .get_parent     = jfs_get_parent,
771 };
772
773 static struct file_system_type jfs_fs_type = {
774         .owner          = THIS_MODULE,
775         .name           = "jfs",
776         .get_sb         = jfs_get_sb,
777         .kill_sb        = kill_block_super,
778         .fs_flags       = FS_REQUIRES_DEV,
779 };
780
781 static void init_once(void *foo)
782 {
783         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
784
785         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
786         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
787         init_rwsem(&jfs_ip->rdwrlock);
788         mutex_init(&jfs_ip->commit_mutex);
789         init_rwsem(&jfs_ip->xattr_sem);
790         spin_lock_init(&jfs_ip->ag_lock);
791         jfs_ip->active_ag = -1;
792         inode_init_once(&jfs_ip->vfs_inode);
793 }
794
795 static int __init init_jfs_fs(void)
796 {
797         int i;
798         int rc;
799
800         jfs_inode_cachep =
801             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
802                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
803                             init_once);
804         if (jfs_inode_cachep == NULL)
805                 return -ENOMEM;
806
807         /*
808          * Metapage initialization
809          */
810         rc = metapage_init();
811         if (rc) {
812                 jfs_err("metapage_init failed w/rc = %d", rc);
813                 goto free_slab;
814         }
815
816         /*
817          * Transaction Manager initialization
818          */
819         rc = txInit();
820         if (rc) {
821                 jfs_err("txInit failed w/rc = %d", rc);
822                 goto free_metapage;
823         }
824
825         /*
826          * I/O completion thread (endio)
827          */
828         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
829         if (IS_ERR(jfsIOthread)) {
830                 rc = PTR_ERR(jfsIOthread);
831                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
832                 goto end_txmngr;
833         }
834
835         if (commit_threads < 1)
836                 commit_threads = num_online_cpus();
837         if (commit_threads > MAX_COMMIT_THREADS)
838                 commit_threads = MAX_COMMIT_THREADS;
839
840         for (i = 0; i < commit_threads; i++) {
841                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
842                 if (IS_ERR(jfsCommitThread[i])) {
843                         rc = PTR_ERR(jfsCommitThread[i]);
844                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
845                         commit_threads = i;
846                         goto kill_committask;
847                 }
848         }
849
850         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
851         if (IS_ERR(jfsSyncThread)) {
852                 rc = PTR_ERR(jfsSyncThread);
853                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
854                 goto kill_committask;
855         }
856
857 #ifdef PROC_FS_JFS
858         jfs_proc_init();
859 #endif
860
861         return register_filesystem(&jfs_fs_type);
862
863 kill_committask:
864         for (i = 0; i < commit_threads; i++)
865                 kthread_stop(jfsCommitThread[i]);
866         kthread_stop(jfsIOthread);
867 end_txmngr:
868         txExit();
869 free_metapage:
870         metapage_exit();
871 free_slab:
872         kmem_cache_destroy(jfs_inode_cachep);
873         return rc;
874 }
875
876 static void __exit exit_jfs_fs(void)
877 {
878         int i;
879
880         jfs_info("exit_jfs_fs called");
881
882         txExit();
883         metapage_exit();
884
885         kthread_stop(jfsIOthread);
886         for (i = 0; i < commit_threads; i++)
887                 kthread_stop(jfsCommitThread[i]);
888         kthread_stop(jfsSyncThread);
889 #ifdef PROC_FS_JFS
890         jfs_proc_clean();
891 #endif
892         unregister_filesystem(&jfs_fs_type);
893         kmem_cache_destroy(jfs_inode_cachep);
894 }
895
896 module_init(init_jfs_fs)
897 module_exit(exit_jfs_fs)