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add filesystem subtype support
[linux-2.6/openmoko-kernel.git] / fs / jfs / super.c
blobea9dc3e65dcf762969a734a0cb3b18f924a1be2e
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/mount.h>
26 #include <linux/moduleparam.h>
27 #include <linux/kthread.h>
28 #include <linux/posix_acl.h>
29 #include <linux/buffer_head.h>
30 #include <asm/uaccess.h>
31 #include <linux/seq_file.h>
32
33 #include "jfs_incore.h"
34 #include "jfs_filsys.h"
35 #include "jfs_inode.h"
36 #include "jfs_metapage.h"
37 #include "jfs_superblock.h"
38 #include "jfs_dmap.h"
39 #include "jfs_imap.h"
40 #include "jfs_acl.h"
41 #include "jfs_debug.h"
42
43 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
44 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
45 MODULE_LICENSE("GPL");
46
47 static struct kmem_cache * jfs_inode_cachep;
48
49 static const struct super_operations jfs_super_operations;
50 static struct export_operations jfs_export_operations;
51 static struct file_system_type jfs_fs_type;
52
53 #define MAX_COMMIT_THREADS 64
54 static int commit_threads = 0;
55 module_param(commit_threads, int, 0);
56 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
57
58 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
59 struct task_struct *jfsIOthread;
60 struct task_struct *jfsSyncThread;
61
62 #ifdef CONFIG_JFS_DEBUG
63 int jfsloglevel = JFS_LOGLEVEL_WARN;
64 module_param(jfsloglevel, int, 0644);
65 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
66 #endif
67
68 static void jfs_handle_error(struct super_block *sb)
69 {
70 struct jfs_sb_info *sbi = JFS_SBI(sb);
71
72 if (sb->s_flags & MS_RDONLY)
73 return;
74
75 updateSuper(sb, FM_DIRTY);
76
77 if (sbi->flag & JFS_ERR_PANIC)
78 panic("JFS (device %s): panic forced after error\n",
79 sb->s_id);
80 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
81 jfs_err("ERROR: (device %s): remounting filesystem "
82 "as read-only\n",
83 sb->s_id);
84 sb->s_flags |= MS_RDONLY;
85 }
86
87 /* nothing is done for continue beyond marking the superblock dirty */
88 }
89
90 void jfs_error(struct super_block *sb, const char * function, ...)
91 {
92 static char error_buf[256];
93 va_list args;
94
95 va_start(args, function);
96 vsnprintf(error_buf, sizeof(error_buf), function, args);
97 va_end(args);
98
99 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
100
101 jfs_handle_error(sb);
102 }
103
104 static struct inode *jfs_alloc_inode(struct super_block *sb)
105 {
106 struct jfs_inode_info *jfs_inode;
107
108 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
109 if (!jfs_inode)
110 return NULL;
111 return &jfs_inode->vfs_inode;
112 }
113
114 static void jfs_destroy_inode(struct inode *inode)
115 {
116 struct jfs_inode_info *ji = JFS_IP(inode);
117
118 BUG_ON(!list_empty(&ji->anon_inode_list));
119
120 spin_lock_irq(&ji->ag_lock);
121 if (ji->active_ag != -1) {
122 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
123 atomic_dec(&bmap->db_active[ji->active_ag]);
124 ji->active_ag = -1;
125 }
126 spin_unlock_irq(&ji->ag_lock);
127
128 #ifdef CONFIG_JFS_POSIX_ACL
129 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
130 posix_acl_release(ji->i_acl);
131 ji->i_acl = JFS_ACL_NOT_CACHED;
132 }
133 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
134 posix_acl_release(ji->i_default_acl);
135 ji->i_default_acl = JFS_ACL_NOT_CACHED;
136 }
137 #endif
138
139 kmem_cache_free(jfs_inode_cachep, ji);
140 }
141
142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
143 {
144 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
145 s64 maxinodes;
146 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
147
148 jfs_info("In jfs_statfs");
149 buf->f_type = JFS_SUPER_MAGIC;
150 buf->f_bsize = sbi->bsize;
151 buf->f_blocks = sbi->bmap->db_mapsize;
152 buf->f_bfree = sbi->bmap->db_nfree;
153 buf->f_bavail = sbi->bmap->db_nfree;
154 /*
155 * If we really return the number of allocated & free inodes, some
156 * applications will fail because they won't see enough free inodes.
157 * We'll try to calculate some guess as to how may inodes we can
158 * really allocate
159 *
160 * buf->f_files = atomic_read(&imap->im_numinos);
161 * buf->f_ffree = atomic_read(&imap->im_numfree);
162 */
163 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
164 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
165 << L2INOSPEREXT), (s64) 0xffffffffLL);
166 buf->f_files = maxinodes;
167 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
168 atomic_read(&imap->im_numfree));
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 rc = jfs_umount(sb);
181 if (rc)
182 jfs_err("jfs_umount failed with return code %d", rc);
183 if (sbi->nls_tab)
184 unload_nls(sbi->nls_tab);
185 sbi->nls_tab = NULL;
186
187 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
188 iput(sbi->direct_inode);
189 sbi->direct_inode = NULL;
190
191 kfree(sbi);
192 }
193
194 enum {
195 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
196 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
197 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
198 };
199
200 static match_table_t tokens = {
201 {Opt_integrity, "integrity"},
202 {Opt_nointegrity, "nointegrity"},
203 {Opt_iocharset, "iocharset=%s"},
204 {Opt_resize, "resize=%u"},
205 {Opt_resize_nosize, "resize"},
206 {Opt_errors, "errors=%s"},
207 {Opt_ignore, "noquota"},
208 {Opt_ignore, "quota"},
209 {Opt_usrquota, "usrquota"},
210 {Opt_grpquota, "grpquota"},
211 {Opt_uid, "uid=%u"},
212 {Opt_gid, "gid=%u"},
213 {Opt_umask, "umask=%u"},
214 {Opt_err, NULL}
215 };
216
217 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
218 int *flag)
219 {
220 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
221 char *p;
222 struct jfs_sb_info *sbi = JFS_SBI(sb);
223
224 *newLVSize = 0;
225
226 if (!options)
227 return 1;
228
229 while ((p = strsep(&options, ",")) != NULL) {
230 substring_t args[MAX_OPT_ARGS];
231 int token;
232 if (!*p)
233 continue;
234
235 token = match_token(p, tokens, args);
236 switch (token) {
237 case Opt_integrity:
238 *flag &= ~JFS_NOINTEGRITY;
239 break;
240 case Opt_nointegrity:
241 *flag |= JFS_NOINTEGRITY;
242 break;
243 case Opt_ignore:
244 /* Silently ignore the quota options */
245 /* Don't do anything ;-) */
246 break;
247 case Opt_iocharset:
248 if (nls_map && nls_map != (void *) -1)
249 unload_nls(nls_map);
250 if (!strcmp(args[0].from, "none"))
251 nls_map = NULL;
252 else {
253 nls_map = load_nls(args[0].from);
254 if (!nls_map) {
255 printk(KERN_ERR
256 "JFS: charset not found\n");
257 goto cleanup;
258 }
259 }
260 break;
261 case Opt_resize:
262 {
263 char *resize = args[0].from;
264 *newLVSize = simple_strtoull(resize, &resize, 0);
265 break;
266 }
267 case Opt_resize_nosize:
268 {
269 *newLVSize = sb->s_bdev->bd_inode->i_size >>
270 sb->s_blocksize_bits;
271 if (*newLVSize == 0)
272 printk(KERN_ERR
273 "JFS: Cannot determine volume size\n");
274 break;
275 }
276 case Opt_errors:
277 {
278 char *errors = args[0].from;
279 if (!errors || !*errors)
280 goto cleanup;
281 if (!strcmp(errors, "continue")) {
282 *flag &= ~JFS_ERR_REMOUNT_RO;
283 *flag &= ~JFS_ERR_PANIC;
284 *flag |= JFS_ERR_CONTINUE;
285 } else if (!strcmp(errors, "remount-ro")) {
286 *flag &= ~JFS_ERR_CONTINUE;
287 *flag &= ~JFS_ERR_PANIC;
288 *flag |= JFS_ERR_REMOUNT_RO;
289 } else if (!strcmp(errors, "panic")) {
290 *flag &= ~JFS_ERR_CONTINUE;
291 *flag &= ~JFS_ERR_REMOUNT_RO;
292 *flag |= JFS_ERR_PANIC;
293 } else {
294 printk(KERN_ERR
295 "JFS: %s is an invalid error handler\n",
296 errors);
297 goto cleanup;
298 }
299 break;
300 }
301
302 #ifdef CONFIG_QUOTA
303 case Opt_quota:
304 case Opt_usrquota:
305 *flag |= JFS_USRQUOTA;
306 break;
307 case Opt_grpquota:
308 *flag |= JFS_GRPQUOTA;
309 break;
310 #else
311 case Opt_usrquota:
312 case Opt_grpquota:
313 case Opt_quota:
314 printk(KERN_ERR
315 "JFS: quota operations not supported\n");
316 break;
317 #endif
318 case Opt_uid:
319 {
320 char *uid = args[0].from;
321 sbi->uid = simple_strtoul(uid, &uid, 0);
322 break;
323 }
324 case Opt_gid:
325 {
326 char *gid = args[0].from;
327 sbi->gid = simple_strtoul(gid, &gid, 0);
328 break;
329 }
330 case Opt_umask:
331 {
332 char *umask = args[0].from;
333 sbi->umask = simple_strtoul(umask, &umask, 8);
334 if (sbi->umask & ~0777) {
335 printk(KERN_ERR
336 "JFS: Invalid value of umask\n");
337 goto cleanup;
338 }
339 break;
340 }
341 default:
342 printk("jfs: Unrecognized mount option \"%s\" "
343 " or missing value\n", p);
344 goto cleanup;
345 }
346 }
347
348 if (nls_map != (void *) -1) {
349 /* Discard old (if remount) */
350 if (sbi->nls_tab)
351 unload_nls(sbi->nls_tab);
352 sbi->nls_tab = nls_map;
353 }
354 return 1;
355
356 cleanup:
357 if (nls_map && nls_map != (void *) -1)
358 unload_nls(nls_map);
359 return 0;
360 }
361
362 static int jfs_remount(struct super_block *sb, int *flags, char *data)
363 {
364 s64 newLVSize = 0;
365 int rc = 0;
366 int flag = JFS_SBI(sb)->flag;
367
368 if (!parse_options(data, sb, &newLVSize, &flag)) {
369 return -EINVAL;
370 }
371 if (newLVSize) {
372 if (sb->s_flags & MS_RDONLY) {
373 printk(KERN_ERR
374 "JFS: resize requires volume to be mounted read-write\n");
375 return -EROFS;
376 }
377 rc = jfs_extendfs(sb, newLVSize, 0);
378 if (rc)
379 return rc;
380 }
381
382 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
383 /*
384 * Invalidate any previously read metadata. fsck may have
385 * changed the on-disk data since we mounted r/o
386 */
387 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
388
389 JFS_SBI(sb)->flag = flag;
390 return jfs_mount_rw(sb, 1);
391 }
392 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
393 rc = jfs_umount_rw(sb);
394 JFS_SBI(sb)->flag = flag;
395 return rc;
396 }
397 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
398 if (!(sb->s_flags & MS_RDONLY)) {
399 rc = jfs_umount_rw(sb);
400 if (rc)
401 return rc;
402 JFS_SBI(sb)->flag = flag;
403 return jfs_mount_rw(sb, 1);
404 }
405 JFS_SBI(sb)->flag = flag;
406
407 return 0;
408 }
409
410 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
411 {
412 struct jfs_sb_info *sbi;
413 struct inode *inode;
414 int rc;
415 s64 newLVSize = 0;
416 int flag;
417
418 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
419
420 if (!new_valid_dev(sb->s_bdev->bd_dev))
421 return -EOVERFLOW;
422
423 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
424 if (!sbi)
425 return -ENOMEM;
426 sb->s_fs_info = sbi;
427 sbi->sb = sb;
428 sbi->uid = sbi->gid = sbi->umask = -1;
429
430 /* initialize the mount flag and determine the default error handler */
431 flag = JFS_ERR_REMOUNT_RO;
432
433 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
434 kfree(sbi);
435 return -EINVAL;
436 }
437 sbi->flag = flag;
438
439 #ifdef CONFIG_JFS_POSIX_ACL
440 sb->s_flags |= MS_POSIXACL;
441 #endif
442
443 if (newLVSize) {
444 printk(KERN_ERR "resize option for remount only\n");
445 return -EINVAL;
446 }
447
448 /*
449 * Initialize blocksize to 4K.
450 */
451 sb_set_blocksize(sb, PSIZE);
452
453 /*
454 * Set method vectors.
455 */
456 sb->s_op = &jfs_super_operations;
457 sb->s_export_op = &jfs_export_operations;
458
459 /*
460 * Initialize direct-mapping inode/address-space
461 */
462 inode = new_inode(sb);
463 if (inode == NULL)
464 goto out_kfree;
465 inode->i_ino = 0;
466 inode->i_nlink = 1;
467 inode->i_size = sb->s_bdev->bd_inode->i_size;
468 inode->i_mapping->a_ops = &jfs_metapage_aops;
469 insert_inode_hash(inode);
470 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
471
472 sbi->direct_inode = inode;
473
474 rc = jfs_mount(sb);
475 if (rc) {
476 if (!silent) {
477 jfs_err("jfs_mount failed w/return code = %d", rc);
478 }
479 goto out_mount_failed;
480 }
481 if (sb->s_flags & MS_RDONLY)
482 sbi->log = NULL;
483 else {
484 rc = jfs_mount_rw(sb, 0);
485 if (rc) {
486 if (!silent) {
487 jfs_err("jfs_mount_rw failed, return code = %d",
488 rc);
489 }
490 goto out_no_rw;
491 }
492 }
493
494 sb->s_magic = JFS_SUPER_MAGIC;
495
496 inode = iget(sb, ROOT_I);
497 if (!inode || is_bad_inode(inode))
498 goto out_no_root;
499 sb->s_root = d_alloc_root(inode);
500 if (!sb->s_root)
501 goto out_no_root;
502
503 if (sbi->mntflag & JFS_OS2)
504 sb->s_root->d_op = &jfs_ci_dentry_operations;
505
506 /* logical blocks are represented by 40 bits in pxd_t, etc. */
507 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
508 #if BITS_PER_LONG == 32
509 /*
510 * Page cache is indexed by long.
511 * I would use MAX_LFS_FILESIZE, but it's only half as big
512 */
513 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
514 #endif
515 sb->s_time_gran = 1;
516 return 0;
517
518 out_no_root:
519 jfs_err("jfs_read_super: get root inode failed");
520 if (inode)
521 iput(inode);
522
523 out_no_rw:
524 rc = jfs_umount(sb);
525 if (rc) {
526 jfs_err("jfs_umount failed with return code %d", rc);
527 }
528 out_mount_failed:
529 filemap_write_and_wait(sbi->direct_inode->i_mapping);
530 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
531 make_bad_inode(sbi->direct_inode);
532 iput(sbi->direct_inode);
533 sbi->direct_inode = NULL;
534 out_kfree:
535 if (sbi->nls_tab)
536 unload_nls(sbi->nls_tab);
537 kfree(sbi);
538 return -EINVAL;
539 }
540
541 static void jfs_write_super_lockfs(struct super_block *sb)
542 {
543 struct jfs_sb_info *sbi = JFS_SBI(sb);
544 struct jfs_log *log = sbi->log;
545
546 if (!(sb->s_flags & MS_RDONLY)) {
547 txQuiesce(sb);
548 lmLogShutdown(log);
549 updateSuper(sb, FM_CLEAN);
550 }
551 }
552
553 static void jfs_unlockfs(struct super_block *sb)
554 {
555 struct jfs_sb_info *sbi = JFS_SBI(sb);
556 struct jfs_log *log = sbi->log;
557 int rc = 0;
558
559 if (!(sb->s_flags & MS_RDONLY)) {
560 updateSuper(sb, FM_MOUNT);
561 if ((rc = lmLogInit(log)))
562 jfs_err("jfs_unlock failed with return code %d", rc);
563 else
564 txResume(sb);
565 }
566 }
567
568 static int jfs_get_sb(struct file_system_type *fs_type,
569 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
570 {
571 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
572 mnt);
573 }
574
575 static int jfs_sync_fs(struct super_block *sb, int wait)
576 {
577 struct jfs_log *log = JFS_SBI(sb)->log;
578
579 /* log == NULL indicates read-only mount */
580 if (log) {
581 jfs_flush_journal(log, wait);
582 jfs_syncpt(log, 0);
583 }
584
585 return 0;
586 }
587
588 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
589 {
590 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
591
592 if (sbi->uid != -1)
593 seq_printf(seq, ",uid=%d", sbi->uid);
594 if (sbi->gid != -1)
595 seq_printf(seq, ",gid=%d", sbi->gid);
596 if (sbi->umask != -1)
597 seq_printf(seq, ",umask=%03o", sbi->umask);
598 if (sbi->flag & JFS_NOINTEGRITY)
599 seq_puts(seq, ",nointegrity");
600
601 #ifdef CONFIG_QUOTA
602 if (sbi->flag & JFS_USRQUOTA)
603 seq_puts(seq, ",usrquota");
604
605 if (sbi->flag & JFS_GRPQUOTA)
606 seq_puts(seq, ",grpquota");
607 #endif
608
609 return 0;
610 }
611
612 #ifdef CONFIG_QUOTA
613
614 /* Read data from quotafile - avoid pagecache and such because we cannot afford
615 * acquiring the locks... As quota files are never truncated and quota code
616 * itself serializes the operations (and noone else should touch the files)
617 * we don't have to be afraid of races */
618 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
619 size_t len, loff_t off)
620 {
621 struct inode *inode = sb_dqopt(sb)->files[type];
622 sector_t blk = off >> sb->s_blocksize_bits;
623 int err = 0;
624 int offset = off & (sb->s_blocksize - 1);
625 int tocopy;
626 size_t toread;
627 struct buffer_head tmp_bh;
628 struct buffer_head *bh;
629 loff_t i_size = i_size_read(inode);
630
631 if (off > i_size)
632 return 0;
633 if (off+len > i_size)
634 len = i_size-off;
635 toread = len;
636 while (toread > 0) {
637 tocopy = sb->s_blocksize - offset < toread ?
638 sb->s_blocksize - offset : toread;
639
640 tmp_bh.b_state = 0;
641 tmp_bh.b_size = 1 << inode->i_blkbits;
642 err = jfs_get_block(inode, blk, &tmp_bh, 0);
643 if (err)
644 return err;
645 if (!buffer_mapped(&tmp_bh)) /* A hole? */
646 memset(data, 0, tocopy);
647 else {
648 bh = sb_bread(sb, tmp_bh.b_blocknr);
649 if (!bh)
650 return -EIO;
651 memcpy(data, bh->b_data+offset, tocopy);
652 brelse(bh);
653 }
654 offset = 0;
655 toread -= tocopy;
656 data += tocopy;
657 blk++;
658 }
659 return len;
660 }
661
662 /* Write to quotafile */
663 static ssize_t jfs_quota_write(struct super_block *sb, int type,
664 const char *data, size_t len, loff_t off)
665 {
666 struct inode *inode = sb_dqopt(sb)->files[type];
667 sector_t blk = off >> sb->s_blocksize_bits;
668 int err = 0;
669 int offset = off & (sb->s_blocksize - 1);
670 int tocopy;
671 size_t towrite = len;
672 struct buffer_head tmp_bh;
673 struct buffer_head *bh;
674
675 mutex_lock(&inode->i_mutex);
676 while (towrite > 0) {
677 tocopy = sb->s_blocksize - offset < towrite ?
678 sb->s_blocksize - offset : towrite;
679
680 tmp_bh.b_state = 0;
681 tmp_bh.b_size = 1 << inode->i_blkbits;
682 err = jfs_get_block(inode, blk, &tmp_bh, 1);
683 if (err)
684 goto out;
685 if (offset || tocopy != sb->s_blocksize)
686 bh = sb_bread(sb, tmp_bh.b_blocknr);
687 else
688 bh = sb_getblk(sb, tmp_bh.b_blocknr);
689 if (!bh) {
690 err = -EIO;
691 goto out;
692 }
693 lock_buffer(bh);
694 memcpy(bh->b_data+offset, data, tocopy);
695 flush_dcache_page(bh->b_page);
696 set_buffer_uptodate(bh);
697 mark_buffer_dirty(bh);
698 unlock_buffer(bh);
699 brelse(bh);
700 offset = 0;
701 towrite -= tocopy;
702 data += tocopy;
703 blk++;
704 }
705 out:
706 if (len == towrite)
707 return err;
708 if (inode->i_size < off+len-towrite)
709 i_size_write(inode, off+len-towrite);
710 inode->i_version++;
711 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
712 mark_inode_dirty(inode);
713 mutex_unlock(&inode->i_mutex);
714 return len - towrite;
715 }
716
717 #endif
718
719 static const struct super_operations jfs_super_operations = {
720 .alloc_inode = jfs_alloc_inode,
721 .destroy_inode = jfs_destroy_inode,
722 .read_inode = jfs_read_inode,
723 .dirty_inode = jfs_dirty_inode,
724 .write_inode = jfs_write_inode,
725 .delete_inode = jfs_delete_inode,
726 .put_super = jfs_put_super,
727 .sync_fs = jfs_sync_fs,
728 .write_super_lockfs = jfs_write_super_lockfs,
729 .unlockfs = jfs_unlockfs,
730 .statfs = jfs_statfs,
731 .remount_fs = jfs_remount,
732 .show_options = jfs_show_options,
733 #ifdef CONFIG_QUOTA
734 .quota_read = jfs_quota_read,
735 .quota_write = jfs_quota_write,
736 #endif
737 };
738
739 static struct export_operations jfs_export_operations = {
740 .get_parent = jfs_get_parent,
741 };
742
743 static struct file_system_type jfs_fs_type = {
744 .owner = THIS_MODULE,
745 .name = "jfs",
746 .get_sb = jfs_get_sb,
747 .kill_sb = kill_block_super,
748 .fs_flags = FS_REQUIRES_DEV,
749 };
750
751 static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags)
752 {
753 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
754
755 if (flags & SLAB_CTOR_CONSTRUCTOR) {
756 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
757 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
758 init_rwsem(&jfs_ip->rdwrlock);
759 mutex_init(&jfs_ip->commit_mutex);
760 init_rwsem(&jfs_ip->xattr_sem);
761 spin_lock_init(&jfs_ip->ag_lock);
762 jfs_ip->active_ag = -1;
763 #ifdef CONFIG_JFS_POSIX_ACL
764 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
765 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
766 #endif
767 inode_init_once(&jfs_ip->vfs_inode);
768 }
769 }
770
771 static int __init init_jfs_fs(void)
772 {
773 int i;
774 int rc;
775
776 jfs_inode_cachep =
777 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
778 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
779 init_once, NULL);
780 if (jfs_inode_cachep == NULL)
781 return -ENOMEM;
782
783 /*
784 * Metapage initialization
785 */
786 rc = metapage_init();
787 if (rc) {
788 jfs_err("metapage_init failed w/rc = %d", rc);
789 goto free_slab;
790 }
791
792 /*
793 * Transaction Manager initialization
794 */
795 rc = txInit();
796 if (rc) {
797 jfs_err("txInit failed w/rc = %d", rc);
798 goto free_metapage;
799 }
800
801 /*
802 * I/O completion thread (endio)
803 */
804 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
805 if (IS_ERR(jfsIOthread)) {
806 rc = PTR_ERR(jfsIOthread);
807 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
808 goto end_txmngr;
809 }
810
811 if (commit_threads < 1)
812 commit_threads = num_online_cpus();
813 if (commit_threads > MAX_COMMIT_THREADS)
814 commit_threads = MAX_COMMIT_THREADS;
815
816 for (i = 0; i < commit_threads; i++) {
817 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
818 if (IS_ERR(jfsCommitThread[i])) {
819 rc = PTR_ERR(jfsCommitThread[i]);
820 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
821 commit_threads = i;
822 goto kill_committask;
823 }
824 }
825
826 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
827 if (IS_ERR(jfsSyncThread)) {
828 rc = PTR_ERR(jfsSyncThread);
829 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
830 goto kill_committask;
831 }
832
833 #ifdef PROC_FS_JFS
834 jfs_proc_init();
835 #endif
836
837 return register_filesystem(&jfs_fs_type);
838
839 kill_committask:
840 for (i = 0; i < commit_threads; i++)
841 kthread_stop(jfsCommitThread[i]);
842 kthread_stop(jfsIOthread);
843 end_txmngr:
844 txExit();
845 free_metapage:
846 metapage_exit();
847 free_slab:
848 kmem_cache_destroy(jfs_inode_cachep);
849 return rc;
850 }
851
852 static void __exit exit_jfs_fs(void)
853 {
854 int i;
855
856 jfs_info("exit_jfs_fs called");
857
858 txExit();
859 metapage_exit();
860
861 kthread_stop(jfsIOthread);
862 for (i = 0; i < commit_threads; i++)
863 kthread_stop(jfsCommitThread[i]);
864 kthread_stop(jfsSyncThread);
865 #ifdef PROC_FS_JFS
866 jfs_proc_clean();
867 #endif
868 unregister_filesystem(&jfs_fs_type);
869 kmem_cache_destroy(jfs_inode_cachep);
870 }
871
872 module_init(init_jfs_fs)
873 module_exit(exit_jfs_fs)
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