quota: kill the vfs_dq_off and vfs_dq_quota_on_remount wrappers
[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 <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/seq_file.h>
36 #include <linux/smp_lock.h>
37
38 #include "jfs_incore.h"
39 #include "jfs_filsys.h"
40 #include "jfs_inode.h"
41 #include "jfs_metapage.h"
42 #include "jfs_superblock.h"
43 #include "jfs_dmap.h"
44 #include "jfs_imap.h"
45 #include "jfs_acl.h"
46 #include "jfs_debug.h"
47
48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
50 MODULE_LICENSE("GPL");
51
52 static struct kmem_cache * jfs_inode_cachep;
53
54 static const struct super_operations jfs_super_operations;
55 static const struct export_operations jfs_export_operations;
56 static struct file_system_type jfs_fs_type;
57
58 #define MAX_COMMIT_THREADS 64
59 static int commit_threads = 0;
60 module_param(commit_threads, int, 0);
61 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
62
63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
64 struct task_struct *jfsIOthread;
65 struct task_struct *jfsSyncThread;
66
67 #ifdef CONFIG_JFS_DEBUG
68 int jfsloglevel = JFS_LOGLEVEL_WARN;
69 module_param(jfsloglevel, int, 0644);
70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
71 #endif
72
73 static void jfs_handle_error(struct super_block *sb)
74 {
75         struct jfs_sb_info *sbi = JFS_SBI(sb);
76
77         if (sb->s_flags & MS_RDONLY)
78                 return;
79
80         updateSuper(sb, FM_DIRTY);
81
82         if (sbi->flag & JFS_ERR_PANIC)
83                 panic("JFS (device %s): panic forced after error\n",
84                         sb->s_id);
85         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
86                 jfs_err("ERROR: (device %s): remounting filesystem "
87                         "as read-only\n",
88                         sb->s_id);
89                 sb->s_flags |= MS_RDONLY;
90         }
91
92         /* nothing is done for continue beyond marking the superblock dirty */
93 }
94
95 void jfs_error(struct super_block *sb, const char * function, ...)
96 {
97         static char error_buf[256];
98         va_list args;
99
100         va_start(args, function);
101         vsnprintf(error_buf, sizeof(error_buf), function, args);
102         va_end(args);
103
104         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
105
106         jfs_handle_error(sb);
107 }
108
109 static struct inode *jfs_alloc_inode(struct super_block *sb)
110 {
111         struct jfs_inode_info *jfs_inode;
112
113         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
114         if (!jfs_inode)
115                 return NULL;
116         return &jfs_inode->vfs_inode;
117 }
118
119 static void jfs_destroy_inode(struct inode *inode)
120 {
121         struct jfs_inode_info *ji = JFS_IP(inode);
122
123         BUG_ON(!list_empty(&ji->anon_inode_list));
124
125         spin_lock_irq(&ji->ag_lock);
126         if (ji->active_ag != -1) {
127                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
128                 atomic_dec(&bmap->db_active[ji->active_ag]);
129                 ji->active_ag = -1;
130         }
131         spin_unlock_irq(&ji->ag_lock);
132         kmem_cache_free(jfs_inode_cachep, ji);
133 }
134
135 static void jfs_clear_inode(struct inode *inode)
136 {
137         dquot_drop(inode);
138 }
139
140 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
141 {
142         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
143         s64 maxinodes;
144         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
145
146         jfs_info("In jfs_statfs");
147         buf->f_type = JFS_SUPER_MAGIC;
148         buf->f_bsize = sbi->bsize;
149         buf->f_blocks = sbi->bmap->db_mapsize;
150         buf->f_bfree = sbi->bmap->db_nfree;
151         buf->f_bavail = sbi->bmap->db_nfree;
152         /*
153          * If we really return the number of allocated & free inodes, some
154          * applications will fail because they won't see enough free inodes.
155          * We'll try to calculate some guess as to how may inodes we can
156          * really allocate
157          *
158          * buf->f_files = atomic_read(&imap->im_numinos);
159          * buf->f_ffree = atomic_read(&imap->im_numfree);
160          */
161         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
162                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
163                          << L2INOSPEREXT), (s64) 0xffffffffLL);
164         buf->f_files = maxinodes;
165         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
166                                     atomic_read(&imap->im_numfree));
167         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
168         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
169                                         sizeof(sbi->uuid)/2);
170
171         buf->f_namelen = JFS_NAME_MAX;
172         return 0;
173 }
174
175 static void jfs_put_super(struct super_block *sb)
176 {
177         struct jfs_sb_info *sbi = JFS_SBI(sb);
178         int rc;
179
180         jfs_info("In jfs_put_super");
181
182         lock_kernel();
183
184         rc = jfs_umount(sb);
185         if (rc)
186                 jfs_err("jfs_umount failed with return code %d", rc);
187
188         unload_nls(sbi->nls_tab);
189
190         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
191         iput(sbi->direct_inode);
192
193         kfree(sbi);
194
195         unlock_kernel();
196 }
197
198 enum {
199         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
200         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
201         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
202 };
203
204 static const match_table_t tokens = {
205         {Opt_integrity, "integrity"},
206         {Opt_nointegrity, "nointegrity"},
207         {Opt_iocharset, "iocharset=%s"},
208         {Opt_resize, "resize=%u"},
209         {Opt_resize_nosize, "resize"},
210         {Opt_errors, "errors=%s"},
211         {Opt_ignore, "noquota"},
212         {Opt_ignore, "quota"},
213         {Opt_usrquota, "usrquota"},
214         {Opt_grpquota, "grpquota"},
215         {Opt_uid, "uid=%u"},
216         {Opt_gid, "gid=%u"},
217         {Opt_umask, "umask=%u"},
218         {Opt_err, NULL}
219 };
220
221 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
222                          int *flag)
223 {
224         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
225         char *p;
226         struct jfs_sb_info *sbi = JFS_SBI(sb);
227
228         *newLVSize = 0;
229
230         if (!options)
231                 return 1;
232
233         while ((p = strsep(&options, ",")) != NULL) {
234                 substring_t args[MAX_OPT_ARGS];
235                 int token;
236                 if (!*p)
237                         continue;
238
239                 token = match_token(p, tokens, args);
240                 switch (token) {
241                 case Opt_integrity:
242                         *flag &= ~JFS_NOINTEGRITY;
243                         break;
244                 case Opt_nointegrity:
245                         *flag |= JFS_NOINTEGRITY;
246                         break;
247                 case Opt_ignore:
248                         /* Silently ignore the quota options */
249                         /* Don't do anything ;-) */
250                         break;
251                 case Opt_iocharset:
252                         if (nls_map && nls_map != (void *) -1)
253                                 unload_nls(nls_map);
254                         if (!strcmp(args[0].from, "none"))
255                                 nls_map = NULL;
256                         else {
257                                 nls_map = load_nls(args[0].from);
258                                 if (!nls_map) {
259                                         printk(KERN_ERR
260                                                "JFS: charset not found\n");
261                                         goto cleanup;
262                                 }
263                         }
264                         break;
265                 case Opt_resize:
266                 {
267                         char *resize = args[0].from;
268                         *newLVSize = simple_strtoull(resize, &resize, 0);
269                         break;
270                 }
271                 case Opt_resize_nosize:
272                 {
273                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
274                                 sb->s_blocksize_bits;
275                         if (*newLVSize == 0)
276                                 printk(KERN_ERR
277                                        "JFS: Cannot determine volume size\n");
278                         break;
279                 }
280                 case Opt_errors:
281                 {
282                         char *errors = args[0].from;
283                         if (!errors || !*errors)
284                                 goto cleanup;
285                         if (!strcmp(errors, "continue")) {
286                                 *flag &= ~JFS_ERR_REMOUNT_RO;
287                                 *flag &= ~JFS_ERR_PANIC;
288                                 *flag |= JFS_ERR_CONTINUE;
289                         } else if (!strcmp(errors, "remount-ro")) {
290                                 *flag &= ~JFS_ERR_CONTINUE;
291                                 *flag &= ~JFS_ERR_PANIC;
292                                 *flag |= JFS_ERR_REMOUNT_RO;
293                         } else if (!strcmp(errors, "panic")) {
294                                 *flag &= ~JFS_ERR_CONTINUE;
295                                 *flag &= ~JFS_ERR_REMOUNT_RO;
296                                 *flag |= JFS_ERR_PANIC;
297                         } else {
298                                 printk(KERN_ERR
299                                        "JFS: %s is an invalid error handler\n",
300                                        errors);
301                                 goto cleanup;
302                         }
303                         break;
304                 }
305
306 #ifdef CONFIG_QUOTA
307                 case Opt_quota:
308                 case Opt_usrquota:
309                         *flag |= JFS_USRQUOTA;
310                         break;
311                 case Opt_grpquota:
312                         *flag |= JFS_GRPQUOTA;
313                         break;
314 #else
315                 case Opt_usrquota:
316                 case Opt_grpquota:
317                 case Opt_quota:
318                         printk(KERN_ERR
319                                "JFS: quota operations not supported\n");
320                         break;
321 #endif
322                 case Opt_uid:
323                 {
324                         char *uid = args[0].from;
325                         sbi->uid = simple_strtoul(uid, &uid, 0);
326                         break;
327                 }
328                 case Opt_gid:
329                 {
330                         char *gid = args[0].from;
331                         sbi->gid = simple_strtoul(gid, &gid, 0);
332                         break;
333                 }
334                 case Opt_umask:
335                 {
336                         char *umask = args[0].from;
337                         sbi->umask = simple_strtoul(umask, &umask, 8);
338                         if (sbi->umask & ~0777) {
339                                 printk(KERN_ERR
340                                        "JFS: Invalid value of umask\n");
341                                 goto cleanup;
342                         }
343                         break;
344                 }
345                 default:
346                         printk("jfs: Unrecognized mount option \"%s\" "
347                                         " or missing value\n", p);
348                         goto cleanup;
349                 }
350         }
351
352         if (nls_map != (void *) -1) {
353                 /* Discard old (if remount) */
354                 unload_nls(sbi->nls_tab);
355                 sbi->nls_tab = nls_map;
356         }
357         return 1;
358
359 cleanup:
360         if (nls_map && nls_map != (void *) -1)
361                 unload_nls(nls_map);
362         return 0;
363 }
364
365 static int jfs_remount(struct super_block *sb, int *flags, char *data)
366 {
367         s64 newLVSize = 0;
368         int rc = 0;
369         int flag = JFS_SBI(sb)->flag;
370         int ret;
371
372         if (!parse_options(data, sb, &newLVSize, &flag)) {
373                 return -EINVAL;
374         }
375         lock_kernel();
376         if (newLVSize) {
377                 if (sb->s_flags & MS_RDONLY) {
378                         printk(KERN_ERR
379                   "JFS: resize requires volume to be mounted read-write\n");
380                         unlock_kernel();
381                         return -EROFS;
382                 }
383                 rc = jfs_extendfs(sb, newLVSize, 0);
384                 if (rc) {
385                         unlock_kernel();
386                         return rc;
387                 }
388         }
389
390         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
391                 /*
392                  * Invalidate any previously read metadata.  fsck may have
393                  * changed the on-disk data since we mounted r/o
394                  */
395                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
396
397                 JFS_SBI(sb)->flag = flag;
398                 ret = jfs_mount_rw(sb, 1);
399
400                 /* mark the fs r/w for quota activity */
401                 sb->s_flags &= ~MS_RDONLY;
402
403                 unlock_kernel();
404                 dquot_resume(sb, -1);
405                 return ret;
406         }
407         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
408                 rc = dquot_suspend(sb, -1);
409                 if (rc < 0) {
410                         unlock_kernel();
411                         return rc;
412                 }
413                 rc = jfs_umount_rw(sb);
414                 JFS_SBI(sb)->flag = flag;
415                 unlock_kernel();
416                 return rc;
417         }
418         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
419                 if (!(sb->s_flags & MS_RDONLY)) {
420                         rc = jfs_umount_rw(sb);
421                         if (rc) {
422                                 unlock_kernel();
423                                 return rc;
424                         }
425                         JFS_SBI(sb)->flag = flag;
426                         ret = jfs_mount_rw(sb, 1);
427                         unlock_kernel();
428                         return ret;
429                 }
430         JFS_SBI(sb)->flag = flag;
431
432         unlock_kernel();
433         return 0;
434 }
435
436 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
437 {
438         struct jfs_sb_info *sbi;
439         struct inode *inode;
440         int rc;
441         s64 newLVSize = 0;
442         int flag, ret = -EINVAL;
443
444         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
445
446         if (!new_valid_dev(sb->s_bdev->bd_dev))
447                 return -EOVERFLOW;
448
449         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
450         if (!sbi)
451                 return -ENOMEM;
452         sb->s_fs_info = sbi;
453         sbi->sb = sb;
454         sbi->uid = sbi->gid = sbi->umask = -1;
455
456         /* initialize the mount flag and determine the default error handler */
457         flag = JFS_ERR_REMOUNT_RO;
458
459         if (!parse_options((char *) data, sb, &newLVSize, &flag))
460                 goto out_kfree;
461         sbi->flag = flag;
462
463 #ifdef CONFIG_JFS_POSIX_ACL
464         sb->s_flags |= MS_POSIXACL;
465 #endif
466
467         if (newLVSize) {
468                 printk(KERN_ERR "resize option for remount only\n");
469                 goto out_kfree;
470         }
471
472         /*
473          * Initialize blocksize to 4K.
474          */
475         sb_set_blocksize(sb, PSIZE);
476
477         /*
478          * Set method vectors.
479          */
480         sb->s_op = &jfs_super_operations;
481         sb->s_export_op = &jfs_export_operations;
482
483         /*
484          * Initialize direct-mapping inode/address-space
485          */
486         inode = new_inode(sb);
487         if (inode == NULL) {
488                 ret = -ENOMEM;
489                 goto out_unload;
490         }
491         inode->i_ino = 0;
492         inode->i_nlink = 1;
493         inode->i_size = sb->s_bdev->bd_inode->i_size;
494         inode->i_mapping->a_ops = &jfs_metapage_aops;
495         insert_inode_hash(inode);
496         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
497
498         sbi->direct_inode = inode;
499
500         rc = jfs_mount(sb);
501         if (rc) {
502                 if (!silent) {
503                         jfs_err("jfs_mount failed w/return code = %d", rc);
504                 }
505                 goto out_mount_failed;
506         }
507         if (sb->s_flags & MS_RDONLY)
508                 sbi->log = NULL;
509         else {
510                 rc = jfs_mount_rw(sb, 0);
511                 if (rc) {
512                         if (!silent) {
513                                 jfs_err("jfs_mount_rw failed, return code = %d",
514                                         rc);
515                         }
516                         goto out_no_rw;
517                 }
518         }
519
520         sb->s_magic = JFS_SUPER_MAGIC;
521
522         inode = jfs_iget(sb, ROOT_I);
523         if (IS_ERR(inode)) {
524                 ret = PTR_ERR(inode);
525                 goto out_no_rw;
526         }
527         sb->s_root = d_alloc_root(inode);
528         if (!sb->s_root)
529                 goto out_no_root;
530
531         if (sbi->mntflag & JFS_OS2)
532                 sb->s_root->d_op = &jfs_ci_dentry_operations;
533
534         /* logical blocks are represented by 40 bits in pxd_t, etc. */
535         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
536 #if BITS_PER_LONG == 32
537         /*
538          * Page cache is indexed by long.
539          * I would use MAX_LFS_FILESIZE, but it's only half as big
540          */
541         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
542 #endif
543         sb->s_time_gran = 1;
544         return 0;
545
546 out_no_root:
547         jfs_err("jfs_read_super: get root dentry failed");
548         iput(inode);
549
550 out_no_rw:
551         rc = jfs_umount(sb);
552         if (rc) {
553                 jfs_err("jfs_umount failed with return code %d", rc);
554         }
555 out_mount_failed:
556         filemap_write_and_wait(sbi->direct_inode->i_mapping);
557         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
558         make_bad_inode(sbi->direct_inode);
559         iput(sbi->direct_inode);
560         sbi->direct_inode = NULL;
561 out_unload:
562         if (sbi->nls_tab)
563                 unload_nls(sbi->nls_tab);
564 out_kfree:
565         kfree(sbi);
566         return ret;
567 }
568
569 static int jfs_freeze(struct super_block *sb)
570 {
571         struct jfs_sb_info *sbi = JFS_SBI(sb);
572         struct jfs_log *log = sbi->log;
573
574         if (!(sb->s_flags & MS_RDONLY)) {
575                 txQuiesce(sb);
576                 lmLogShutdown(log);
577                 updateSuper(sb, FM_CLEAN);
578         }
579         return 0;
580 }
581
582 static int jfs_unfreeze(struct super_block *sb)
583 {
584         struct jfs_sb_info *sbi = JFS_SBI(sb);
585         struct jfs_log *log = sbi->log;
586         int rc = 0;
587
588         if (!(sb->s_flags & MS_RDONLY)) {
589                 updateSuper(sb, FM_MOUNT);
590                 if ((rc = lmLogInit(log)))
591                         jfs_err("jfs_unlock failed with return code %d", rc);
592                 else
593                         txResume(sb);
594         }
595         return 0;
596 }
597
598 static int jfs_get_sb(struct file_system_type *fs_type,
599         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
600 {
601         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
602                            mnt);
603 }
604
605 static int jfs_sync_fs(struct super_block *sb, int wait)
606 {
607         struct jfs_log *log = JFS_SBI(sb)->log;
608
609         /* log == NULL indicates read-only mount */
610         if (log) {
611                 jfs_flush_journal(log, wait);
612                 jfs_syncpt(log, 0);
613         }
614
615         return 0;
616 }
617
618 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
619 {
620         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
621
622         if (sbi->uid != -1)
623                 seq_printf(seq, ",uid=%d", sbi->uid);
624         if (sbi->gid != -1)
625                 seq_printf(seq, ",gid=%d", sbi->gid);
626         if (sbi->umask != -1)
627                 seq_printf(seq, ",umask=%03o", sbi->umask);
628         if (sbi->flag & JFS_NOINTEGRITY)
629                 seq_puts(seq, ",nointegrity");
630         if (sbi->nls_tab)
631                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
632         if (sbi->flag & JFS_ERR_CONTINUE)
633                 seq_printf(seq, ",errors=continue");
634         if (sbi->flag & JFS_ERR_PANIC)
635                 seq_printf(seq, ",errors=panic");
636
637 #ifdef CONFIG_QUOTA
638         if (sbi->flag & JFS_USRQUOTA)
639                 seq_puts(seq, ",usrquota");
640
641         if (sbi->flag & JFS_GRPQUOTA)
642                 seq_puts(seq, ",grpquota");
643 #endif
644
645         return 0;
646 }
647
648 #ifdef CONFIG_QUOTA
649
650 /* Read data from quotafile - avoid pagecache and such because we cannot afford
651  * acquiring the locks... As quota files are never truncated and quota code
652  * itself serializes the operations (and noone else should touch the files)
653  * we don't have to be afraid of races */
654 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
655                               size_t len, loff_t off)
656 {
657         struct inode *inode = sb_dqopt(sb)->files[type];
658         sector_t blk = off >> sb->s_blocksize_bits;
659         int err = 0;
660         int offset = off & (sb->s_blocksize - 1);
661         int tocopy;
662         size_t toread;
663         struct buffer_head tmp_bh;
664         struct buffer_head *bh;
665         loff_t i_size = i_size_read(inode);
666
667         if (off > i_size)
668                 return 0;
669         if (off+len > i_size)
670                 len = i_size-off;
671         toread = len;
672         while (toread > 0) {
673                 tocopy = sb->s_blocksize - offset < toread ?
674                                 sb->s_blocksize - offset : toread;
675
676                 tmp_bh.b_state = 0;
677                 tmp_bh.b_size = 1 << inode->i_blkbits;
678                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
679                 if (err)
680                         return err;
681                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
682                         memset(data, 0, tocopy);
683                 else {
684                         bh = sb_bread(sb, tmp_bh.b_blocknr);
685                         if (!bh)
686                                 return -EIO;
687                         memcpy(data, bh->b_data+offset, tocopy);
688                         brelse(bh);
689                 }
690                 offset = 0;
691                 toread -= tocopy;
692                 data += tocopy;
693                 blk++;
694         }
695         return len;
696 }
697
698 /* Write to quotafile */
699 static ssize_t jfs_quota_write(struct super_block *sb, int type,
700                                const char *data, size_t len, loff_t off)
701 {
702         struct inode *inode = sb_dqopt(sb)->files[type];
703         sector_t blk = off >> sb->s_blocksize_bits;
704         int err = 0;
705         int offset = off & (sb->s_blocksize - 1);
706         int tocopy;
707         size_t towrite = len;
708         struct buffer_head tmp_bh;
709         struct buffer_head *bh;
710
711         mutex_lock(&inode->i_mutex);
712         while (towrite > 0) {
713                 tocopy = sb->s_blocksize - offset < towrite ?
714                                 sb->s_blocksize - offset : towrite;
715
716                 tmp_bh.b_state = 0;
717                 tmp_bh.b_size = 1 << inode->i_blkbits;
718                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
719                 if (err)
720                         goto out;
721                 if (offset || tocopy != sb->s_blocksize)
722                         bh = sb_bread(sb, tmp_bh.b_blocknr);
723                 else
724                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
725                 if (!bh) {
726                         err = -EIO;
727                         goto out;
728                 }
729                 lock_buffer(bh);
730                 memcpy(bh->b_data+offset, data, tocopy);
731                 flush_dcache_page(bh->b_page);
732                 set_buffer_uptodate(bh);
733                 mark_buffer_dirty(bh);
734                 unlock_buffer(bh);
735                 brelse(bh);
736                 offset = 0;
737                 towrite -= tocopy;
738                 data += tocopy;
739                 blk++;
740         }
741 out:
742         if (len == towrite) {
743                 mutex_unlock(&inode->i_mutex);
744                 return err;
745         }
746         if (inode->i_size < off+len-towrite)
747                 i_size_write(inode, off+len-towrite);
748         inode->i_version++;
749         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
750         mark_inode_dirty(inode);
751         mutex_unlock(&inode->i_mutex);
752         return len - towrite;
753 }
754
755 #endif
756
757 static const struct super_operations jfs_super_operations = {
758         .alloc_inode    = jfs_alloc_inode,
759         .destroy_inode  = jfs_destroy_inode,
760         .dirty_inode    = jfs_dirty_inode,
761         .write_inode    = jfs_write_inode,
762         .delete_inode   = jfs_delete_inode,
763         .clear_inode    = jfs_clear_inode,
764         .put_super      = jfs_put_super,
765         .sync_fs        = jfs_sync_fs,
766         .freeze_fs      = jfs_freeze,
767         .unfreeze_fs    = jfs_unfreeze,
768         .statfs         = jfs_statfs,
769         .remount_fs     = jfs_remount,
770         .show_options   = jfs_show_options,
771 #ifdef CONFIG_QUOTA
772         .quota_read     = jfs_quota_read,
773         .quota_write    = jfs_quota_write,
774 #endif
775 };
776
777 static const struct export_operations jfs_export_operations = {
778         .fh_to_dentry   = jfs_fh_to_dentry,
779         .fh_to_parent   = jfs_fh_to_parent,
780         .get_parent     = jfs_get_parent,
781 };
782
783 static struct file_system_type jfs_fs_type = {
784         .owner          = THIS_MODULE,
785         .name           = "jfs",
786         .get_sb         = jfs_get_sb,
787         .kill_sb        = kill_block_super,
788         .fs_flags       = FS_REQUIRES_DEV,
789 };
790
791 static void init_once(void *foo)
792 {
793         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
794
795         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
796         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
797         init_rwsem(&jfs_ip->rdwrlock);
798         mutex_init(&jfs_ip->commit_mutex);
799         init_rwsem(&jfs_ip->xattr_sem);
800         spin_lock_init(&jfs_ip->ag_lock);
801         jfs_ip->active_ag = -1;
802         inode_init_once(&jfs_ip->vfs_inode);
803 }
804
805 static int __init init_jfs_fs(void)
806 {
807         int i;
808         int rc;
809
810         jfs_inode_cachep =
811             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
812                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
813                             init_once);
814         if (jfs_inode_cachep == NULL)
815                 return -ENOMEM;
816
817         /*
818          * Metapage initialization
819          */
820         rc = metapage_init();
821         if (rc) {
822                 jfs_err("metapage_init failed w/rc = %d", rc);
823                 goto free_slab;
824         }
825
826         /*
827          * Transaction Manager initialization
828          */
829         rc = txInit();
830         if (rc) {
831                 jfs_err("txInit failed w/rc = %d", rc);
832                 goto free_metapage;
833         }
834
835         /*
836          * I/O completion thread (endio)
837          */
838         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
839         if (IS_ERR(jfsIOthread)) {
840                 rc = PTR_ERR(jfsIOthread);
841                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
842                 goto end_txmngr;
843         }
844
845         if (commit_threads < 1)
846                 commit_threads = num_online_cpus();
847         if (commit_threads > MAX_COMMIT_THREADS)
848                 commit_threads = MAX_COMMIT_THREADS;
849
850         for (i = 0; i < commit_threads; i++) {
851                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
852                 if (IS_ERR(jfsCommitThread[i])) {
853                         rc = PTR_ERR(jfsCommitThread[i]);
854                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
855                         commit_threads = i;
856                         goto kill_committask;
857                 }
858         }
859
860         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
861         if (IS_ERR(jfsSyncThread)) {
862                 rc = PTR_ERR(jfsSyncThread);
863                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
864                 goto kill_committask;
865         }
866
867 #ifdef PROC_FS_JFS
868         jfs_proc_init();
869 #endif
870
871         return register_filesystem(&jfs_fs_type);
872
873 kill_committask:
874         for (i = 0; i < commit_threads; i++)
875                 kthread_stop(jfsCommitThread[i]);
876         kthread_stop(jfsIOthread);
877 end_txmngr:
878         txExit();
879 free_metapage:
880         metapage_exit();
881 free_slab:
882         kmem_cache_destroy(jfs_inode_cachep);
883         return rc;
884 }
885
886 static void __exit exit_jfs_fs(void)
887 {
888         int i;
889
890         jfs_info("exit_jfs_fs called");
891
892         txExit();
893         metapage_exit();
894
895         kthread_stop(jfsIOthread);
896         for (i = 0; i < commit_threads; i++)
897                 kthread_stop(jfsCommitThread[i]);
898         kthread_stop(jfsSyncThread);
899 #ifdef PROC_FS_JFS
900         jfs_proc_clean();
901 #endif
902         unregister_filesystem(&jfs_fs_type);
903         kmem_cache_destroy(jfs_inode_cachep);
904 }
905
906 module_init(init_jfs_fs)
907 module_exit(exit_jfs_fs)