Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[sfrench/cifs-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 <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                 unlock_kernel();
400                 return ret;
401         }
402         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
403                 rc = jfs_umount_rw(sb);
404                 JFS_SBI(sb)->flag = flag;
405                 unlock_kernel();
406                 return rc;
407         }
408         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
409                 if (!(sb->s_flags & MS_RDONLY)) {
410                         rc = jfs_umount_rw(sb);
411                         if (rc) {
412                                 unlock_kernel();
413                                 return rc;
414                         }
415                         JFS_SBI(sb)->flag = flag;
416                         ret = jfs_mount_rw(sb, 1);
417                         unlock_kernel();
418                         return ret;
419                 }
420         JFS_SBI(sb)->flag = flag;
421
422         unlock_kernel();
423         return 0;
424 }
425
426 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
427 {
428         struct jfs_sb_info *sbi;
429         struct inode *inode;
430         int rc;
431         s64 newLVSize = 0;
432         int flag, ret = -EINVAL;
433
434         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
435
436         if (!new_valid_dev(sb->s_bdev->bd_dev))
437                 return -EOVERFLOW;
438
439         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
440         if (!sbi)
441                 return -ENOMEM;
442         sb->s_fs_info = sbi;
443         sbi->sb = sb;
444         sbi->uid = sbi->gid = sbi->umask = -1;
445
446         /* initialize the mount flag and determine the default error handler */
447         flag = JFS_ERR_REMOUNT_RO;
448
449         if (!parse_options((char *) data, sb, &newLVSize, &flag))
450                 goto out_kfree;
451         sbi->flag = flag;
452
453 #ifdef CONFIG_JFS_POSIX_ACL
454         sb->s_flags |= MS_POSIXACL;
455 #endif
456
457         if (newLVSize) {
458                 printk(KERN_ERR "resize option for remount only\n");
459                 goto out_kfree;
460         }
461
462         /*
463          * Initialize blocksize to 4K.
464          */
465         sb_set_blocksize(sb, PSIZE);
466
467         /*
468          * Set method vectors.
469          */
470         sb->s_op = &jfs_super_operations;
471         sb->s_export_op = &jfs_export_operations;
472
473         /*
474          * Initialize direct-mapping inode/address-space
475          */
476         inode = new_inode(sb);
477         if (inode == NULL) {
478                 ret = -ENOMEM;
479                 goto out_unload;
480         }
481         inode->i_ino = 0;
482         inode->i_nlink = 1;
483         inode->i_size = sb->s_bdev->bd_inode->i_size;
484         inode->i_mapping->a_ops = &jfs_metapage_aops;
485         insert_inode_hash(inode);
486         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
487
488         sbi->direct_inode = inode;
489
490         rc = jfs_mount(sb);
491         if (rc) {
492                 if (!silent) {
493                         jfs_err("jfs_mount failed w/return code = %d", rc);
494                 }
495                 goto out_mount_failed;
496         }
497         if (sb->s_flags & MS_RDONLY)
498                 sbi->log = NULL;
499         else {
500                 rc = jfs_mount_rw(sb, 0);
501                 if (rc) {
502                         if (!silent) {
503                                 jfs_err("jfs_mount_rw failed, return code = %d",
504                                         rc);
505                         }
506                         goto out_no_rw;
507                 }
508         }
509
510         sb->s_magic = JFS_SUPER_MAGIC;
511
512         inode = jfs_iget(sb, ROOT_I);
513         if (IS_ERR(inode)) {
514                 ret = PTR_ERR(inode);
515                 goto out_no_rw;
516         }
517         sb->s_root = d_alloc_root(inode);
518         if (!sb->s_root)
519                 goto out_no_root;
520
521         if (sbi->mntflag & JFS_OS2)
522                 sb->s_root->d_op = &jfs_ci_dentry_operations;
523
524         /* logical blocks are represented by 40 bits in pxd_t, etc. */
525         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
526 #if BITS_PER_LONG == 32
527         /*
528          * Page cache is indexed by long.
529          * I would use MAX_LFS_FILESIZE, but it's only half as big
530          */
531         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
532 #endif
533         sb->s_time_gran = 1;
534         return 0;
535
536 out_no_root:
537         jfs_err("jfs_read_super: get root dentry failed");
538         iput(inode);
539
540 out_no_rw:
541         rc = jfs_umount(sb);
542         if (rc) {
543                 jfs_err("jfs_umount failed with return code %d", rc);
544         }
545 out_mount_failed:
546         filemap_write_and_wait(sbi->direct_inode->i_mapping);
547         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
548         make_bad_inode(sbi->direct_inode);
549         iput(sbi->direct_inode);
550         sbi->direct_inode = NULL;
551 out_unload:
552         if (sbi->nls_tab)
553                 unload_nls(sbi->nls_tab);
554 out_kfree:
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)