?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
net: caif: spi: fix potential NULL dereference
[linux-2.6/next.git] / fs / jfs / super.c
blob0669fc1cc3bf25b69121cb2c34cd216e1a7a9966
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
37 #include "jfs_incore.h"
38 #include "jfs_filsys.h"
39 #include "jfs_inode.h"
40 #include "jfs_metapage.h"
41 #include "jfs_superblock.h"
42 #include "jfs_dmap.h"
43 #include "jfs_imap.h"
44 #include "jfs_acl.h"
45 #include "jfs_debug.h"
46
47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
49 MODULE_LICENSE("GPL");
50
51 static struct kmem_cache * jfs_inode_cachep;
52
53 static const struct super_operations jfs_super_operations;
54 static const struct export_operations jfs_export_operations;
55 static struct file_system_type jfs_fs_type;
56
57 #define MAX_COMMIT_THREADS 64
58 static int commit_threads = 0;
59 module_param(commit_threads, int, 0);
60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
61
62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
63 struct task_struct *jfsIOthread;
64 struct task_struct *jfsSyncThread;
65
66 #ifdef CONFIG_JFS_DEBUG
67 int jfsloglevel = JFS_LOGLEVEL_WARN;
68 module_param(jfsloglevel, int, 0644);
69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
70 #endif
71
72 static void jfs_handle_error(struct super_block *sb)
73 {
74 struct jfs_sb_info *sbi = JFS_SBI(sb);
75
76 if (sb->s_flags & MS_RDONLY)
77 return;
78
79 updateSuper(sb, FM_DIRTY);
80
81 if (sbi->flag & JFS_ERR_PANIC)
82 panic("JFS (device %s): panic forced after error\n",
83 sb->s_id);
84 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
85 jfs_err("ERROR: (device %s): remounting filesystem "
86 "as read-only\n",
87 sb->s_id);
88 sb->s_flags |= MS_RDONLY;
89 }
90
91 /* nothing is done for continue beyond marking the superblock dirty */
92 }
93
94 void jfs_error(struct super_block *sb, const char * function, ...)
95 {
96 static char error_buf[256];
97 va_list args;
98
99 va_start(args, function);
100 vsnprintf(error_buf, sizeof(error_buf), function, args);
101 va_end(args);
102
103 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
104
105 jfs_handle_error(sb);
106 }
107
108 static struct inode *jfs_alloc_inode(struct super_block *sb)
109 {
110 struct jfs_inode_info *jfs_inode;
111
112 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
113 if (!jfs_inode)
114 return NULL;
115 return &jfs_inode->vfs_inode;
116 }
117
118 static void jfs_destroy_inode(struct inode *inode)
119 {
120 struct jfs_inode_info *ji = JFS_IP(inode);
121
122 BUG_ON(!list_empty(&ji->anon_inode_list));
123
124 spin_lock_irq(&ji->ag_lock);
125 if (ji->active_ag != -1) {
126 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
127 atomic_dec(&bmap->db_active[ji->active_ag]);
128 ji->active_ag = -1;
129 }
130 spin_unlock_irq(&ji->ag_lock);
131 kmem_cache_free(jfs_inode_cachep, ji);
132 }
133
134 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
135 {
136 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
137 s64 maxinodes;
138 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
139
140 jfs_info("In jfs_statfs");
141 buf->f_type = JFS_SUPER_MAGIC;
142 buf->f_bsize = sbi->bsize;
143 buf->f_blocks = sbi->bmap->db_mapsize;
144 buf->f_bfree = sbi->bmap->db_nfree;
145 buf->f_bavail = sbi->bmap->db_nfree;
146 /*
147 * If we really return the number of allocated & free inodes, some
148 * applications will fail because they won't see enough free inodes.
149 * We'll try to calculate some guess as to how may inodes we can
150 * really allocate
151 *
152 * buf->f_files = atomic_read(&imap->im_numinos);
153 * buf->f_ffree = atomic_read(&imap->im_numfree);
154 */
155 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
156 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
157 << L2INOSPEREXT), (s64) 0xffffffffLL);
158 buf->f_files = maxinodes;
159 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
160 atomic_read(&imap->im_numfree));
161 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
162 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
163 sizeof(sbi->uuid)/2);
164
165 buf->f_namelen = JFS_NAME_MAX;
166 return 0;
167 }
168
169 static void jfs_put_super(struct super_block *sb)
170 {
171 struct jfs_sb_info *sbi = JFS_SBI(sb);
172 int rc;
173
174 jfs_info("In jfs_put_super");
175
176 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
177
178 rc = jfs_umount(sb);
179 if (rc)
180 jfs_err("jfs_umount failed with return code %d", rc);
181
182 unload_nls(sbi->nls_tab);
183
184 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
185 iput(sbi->direct_inode);
186
187 kfree(sbi);
188 }
189
190 enum {
191 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
192 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
193 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
194 };
195
196 static const match_table_t tokens = {
197 {Opt_integrity, "integrity"},
198 {Opt_nointegrity, "nointegrity"},
199 {Opt_iocharset, "iocharset=%s"},
200 {Opt_resize, "resize=%u"},
201 {Opt_resize_nosize, "resize"},
202 {Opt_errors, "errors=%s"},
203 {Opt_ignore, "noquota"},
204 {Opt_ignore, "quota"},
205 {Opt_usrquota, "usrquota"},
206 {Opt_grpquota, "grpquota"},
207 {Opt_uid, "uid=%u"},
208 {Opt_gid, "gid=%u"},
209 {Opt_umask, "umask=%u"},
210 {Opt_err, NULL}
211 };
212
213 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
214 int *flag)
215 {
216 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
217 char *p;
218 struct jfs_sb_info *sbi = JFS_SBI(sb);
219
220 *newLVSize = 0;
221
222 if (!options)
223 return 1;
224
225 while ((p = strsep(&options, ",")) != NULL) {
226 substring_t args[MAX_OPT_ARGS];
227 int token;
228 if (!*p)
229 continue;
230
231 token = match_token(p, tokens, args);
232 switch (token) {
233 case Opt_integrity:
234 *flag &= ~JFS_NOINTEGRITY;
235 break;
236 case Opt_nointegrity:
237 *flag |= JFS_NOINTEGRITY;
238 break;
239 case Opt_ignore:
240 /* Silently ignore the quota options */
241 /* Don't do anything ;-) */
242 break;
243 case Opt_iocharset:
244 if (nls_map && nls_map != (void *) -1)
245 unload_nls(nls_map);
246 if (!strcmp(args[0].from, "none"))
247 nls_map = NULL;
248 else {
249 nls_map = load_nls(args[0].from);
250 if (!nls_map) {
251 printk(KERN_ERR
252 "JFS: charset not found\n");
253 goto cleanup;
254 }
255 }
256 break;
257 case Opt_resize:
258 {
259 char *resize = args[0].from;
260 *newLVSize = simple_strtoull(resize, &resize, 0);
261 break;
262 }
263 case Opt_resize_nosize:
264 {
265 *newLVSize = sb->s_bdev->bd_inode->i_size >>
266 sb->s_blocksize_bits;
267 if (*newLVSize == 0)
268 printk(KERN_ERR
269 "JFS: Cannot determine volume size\n");
270 break;
271 }
272 case Opt_errors:
273 {
274 char *errors = args[0].from;
275 if (!errors || !*errors)
276 goto cleanup;
277 if (!strcmp(errors, "continue")) {
278 *flag &= ~JFS_ERR_REMOUNT_RO;
279 *flag &= ~JFS_ERR_PANIC;
280 *flag |= JFS_ERR_CONTINUE;
281 } else if (!strcmp(errors, "remount-ro")) {
282 *flag &= ~JFS_ERR_CONTINUE;
283 *flag &= ~JFS_ERR_PANIC;
284 *flag |= JFS_ERR_REMOUNT_RO;
285 } else if (!strcmp(errors, "panic")) {
286 *flag &= ~JFS_ERR_CONTINUE;
287 *flag &= ~JFS_ERR_REMOUNT_RO;
288 *flag |= JFS_ERR_PANIC;
289 } else {
290 printk(KERN_ERR
291 "JFS: %s is an invalid error handler\n",
292 errors);
293 goto cleanup;
294 }
295 break;
296 }
297
298 #ifdef CONFIG_QUOTA
299 case Opt_quota:
300 case Opt_usrquota:
301 *flag |= JFS_USRQUOTA;
302 break;
303 case Opt_grpquota:
304 *flag |= JFS_GRPQUOTA;
305 break;
306 #else
307 case Opt_usrquota:
308 case Opt_grpquota:
309 case Opt_quota:
310 printk(KERN_ERR
311 "JFS: quota operations not supported\n");
312 break;
313 #endif
314 case Opt_uid:
315 {
316 char *uid = args[0].from;
317 sbi->uid = simple_strtoul(uid, &uid, 0);
318 break;
319 }
320 case Opt_gid:
321 {
322 char *gid = args[0].from;
323 sbi->gid = simple_strtoul(gid, &gid, 0);
324 break;
325 }
326 case Opt_umask:
327 {
328 char *umask = args[0].from;
329 sbi->umask = simple_strtoul(umask, &umask, 8);
330 if (sbi->umask & ~0777) {
331 printk(KERN_ERR
332 "JFS: Invalid value of umask\n");
333 goto cleanup;
334 }
335 break;
336 }
337 default:
338 printk("jfs: Unrecognized mount option \"%s\" "
339 " or missing value\n", p);
340 goto cleanup;
341 }
342 }
343
344 if (nls_map != (void *) -1) {
345 /* Discard old (if remount) */
346 unload_nls(sbi->nls_tab);
347 sbi->nls_tab = nls_map;
348 }
349 return 1;
350
351 cleanup:
352 if (nls_map && nls_map != (void *) -1)
353 unload_nls(nls_map);
354 return 0;
355 }
356
357 static int jfs_remount(struct super_block *sb, int *flags, char *data)
358 {
359 s64 newLVSize = 0;
360 int rc = 0;
361 int flag = JFS_SBI(sb)->flag;
362 int ret;
363
364 if (!parse_options(data, sb, &newLVSize, &flag)) {
365 return -EINVAL;
366 }
367
368 if (newLVSize) {
369 if (sb->s_flags & MS_RDONLY) {
370 printk(KERN_ERR
371 "JFS: resize requires volume to be mounted read-write\n");
372 return -EROFS;
373 }
374 rc = jfs_extendfs(sb, newLVSize, 0);
375 if (rc)
376 return rc;
377 }
378
379 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
380 /*
381 * Invalidate any previously read metadata. fsck may have
382 * changed the on-disk data since we mounted r/o
383 */
384 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
385
386 JFS_SBI(sb)->flag = flag;
387 ret = jfs_mount_rw(sb, 1);
388
389 /* mark the fs r/w for quota activity */
390 sb->s_flags &= ~MS_RDONLY;
391
392 dquot_resume(sb, -1);
393 return ret;
394 }
395 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
396 rc = dquot_suspend(sb, -1);
397 if (rc < 0) {
398 return rc;
399 }
400 rc = jfs_umount_rw(sb);
401 JFS_SBI(sb)->flag = flag;
402 return rc;
403 }
404 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
405 if (!(sb->s_flags & MS_RDONLY)) {
406 rc = jfs_umount_rw(sb);
407 if (rc)
408 return rc;
409
410 JFS_SBI(sb)->flag = flag;
411 ret = jfs_mount_rw(sb, 1);
412 return ret;
413 }
414 JFS_SBI(sb)->flag = flag;
415
416 return 0;
417 }
418
419 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
420 {
421 struct jfs_sb_info *sbi;
422 struct inode *inode;
423 int rc;
424 s64 newLVSize = 0;
425 int flag, ret = -EINVAL;
426
427 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
428
429 if (!new_valid_dev(sb->s_bdev->bd_dev))
430 return -EOVERFLOW;
431
432 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
433 if (!sbi)
434 return -ENOMEM;
435
436 sb->s_fs_info = sbi;
437 sbi->sb = sb;
438 sbi->uid = sbi->gid = sbi->umask = -1;
439
440 /* initialize the mount flag and determine the default error handler */
441 flag = JFS_ERR_REMOUNT_RO;
442
443 if (!parse_options((char *) data, sb, &newLVSize, &flag))
444 goto out_kfree;
445 sbi->flag = flag;
446
447 #ifdef CONFIG_JFS_POSIX_ACL
448 sb->s_flags |= MS_POSIXACL;
449 #endif
450
451 if (newLVSize) {
452 printk(KERN_ERR "resize option for remount only\n");
453 goto out_kfree;
454 }
455
456 /*
457 * Initialize blocksize to 4K.
458 */
459 sb_set_blocksize(sb, PSIZE);
460
461 /*
462 * Set method vectors.
463 */
464 sb->s_op = &jfs_super_operations;
465 sb->s_export_op = &jfs_export_operations;
466 #ifdef CONFIG_QUOTA
467 sb->dq_op = &dquot_operations;
468 sb->s_qcop = &dquot_quotactl_ops;
469 #endif
470
471 /*
472 * Initialize direct-mapping inode/address-space
473 */
474 inode = new_inode(sb);
475 if (inode == NULL) {
476 ret = -ENOMEM;
477 goto out_unload;
478 }
479 inode->i_ino = 0;
480 inode->i_nlink = 1;
481 inode->i_size = sb->s_bdev->bd_inode->i_size;
482 inode->i_mapping->a_ops = &jfs_metapage_aops;
483 insert_inode_hash(inode);
484 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
485
486 sbi->direct_inode = inode;
487
488 rc = jfs_mount(sb);
489 if (rc) {
490 if (!silent) {
491 jfs_err("jfs_mount failed w/return code = %d", rc);
492 }
493 goto out_mount_failed;
494 }
495 if (sb->s_flags & MS_RDONLY)
496 sbi->log = NULL;
497 else {
498 rc = jfs_mount_rw(sb, 0);
499 if (rc) {
500 if (!silent) {
501 jfs_err("jfs_mount_rw failed, return code = %d",
502 rc);
503 }
504 goto out_no_rw;
505 }
506 }
507
508 sb->s_magic = JFS_SUPER_MAGIC;
509
510 inode = jfs_iget(sb, ROOT_I);
511 if (IS_ERR(inode)) {
512 ret = PTR_ERR(inode);
513 goto out_no_rw;
514 }
515 sb->s_root = d_alloc_root(inode);
516 if (!sb->s_root)
517 goto out_no_root;
518
519 if (sbi->mntflag & JFS_OS2)
520 sb->s_root->d_op = &jfs_ci_dentry_operations;
521
522 /* logical blocks are represented by 40 bits in pxd_t, etc. */
523 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
524 #if BITS_PER_LONG == 32
525 /*
526 * Page cache is indexed by long.
527 * I would use MAX_LFS_FILESIZE, but it's only half as big
528 */
529 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
530 #endif
531 sb->s_time_gran = 1;
532 return 0;
533
534 out_no_root:
535 jfs_err("jfs_read_super: get root dentry failed");
536 iput(inode);
537
538 out_no_rw:
539 rc = jfs_umount(sb);
540 if (rc) {
541 jfs_err("jfs_umount failed with return code %d", rc);
542 }
543 out_mount_failed:
544 filemap_write_and_wait(sbi->direct_inode->i_mapping);
545 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
546 make_bad_inode(sbi->direct_inode);
547 iput(sbi->direct_inode);
548 sbi->direct_inode = NULL;
549 out_unload:
550 if (sbi->nls_tab)
551 unload_nls(sbi->nls_tab);
552 out_kfree:
553 kfree(sbi);
554 return ret;
555 }
556
557 static int jfs_freeze(struct super_block *sb)
558 {
559 struct jfs_sb_info *sbi = JFS_SBI(sb);
560 struct jfs_log *log = sbi->log;
561
562 if (!(sb->s_flags & MS_RDONLY)) {
563 txQuiesce(sb);
564 lmLogShutdown(log);
565 updateSuper(sb, FM_CLEAN);
566 }
567 return 0;
568 }
569
570 static int jfs_unfreeze(struct super_block *sb)
571 {
572 struct jfs_sb_info *sbi = JFS_SBI(sb);
573 struct jfs_log *log = sbi->log;
574 int rc = 0;
575
576 if (!(sb->s_flags & MS_RDONLY)) {
577 updateSuper(sb, FM_MOUNT);
578 if ((rc = lmLogInit(log)))
579 jfs_err("jfs_unlock failed with return code %d", rc);
580 else
581 txResume(sb);
582 }
583 return 0;
584 }
585
586 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
587 int flags, const char *dev_name, void *data)
588 {
589 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
590 }
591
592 static int jfs_sync_fs(struct super_block *sb, int wait)
593 {
594 struct jfs_log *log = JFS_SBI(sb)->log;
595
596 /* log == NULL indicates read-only mount */
597 if (log) {
598 jfs_flush_journal(log, wait);
599 jfs_syncpt(log, 0);
600 }
601
602 return 0;
603 }
604
605 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
606 {
607 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
608
609 if (sbi->uid != -1)
610 seq_printf(seq, ",uid=%d", sbi->uid);
611 if (sbi->gid != -1)
612 seq_printf(seq, ",gid=%d", sbi->gid);
613 if (sbi->umask != -1)
614 seq_printf(seq, ",umask=%03o", sbi->umask);
615 if (sbi->flag & JFS_NOINTEGRITY)
616 seq_puts(seq, ",nointegrity");
617 if (sbi->nls_tab)
618 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
619 if (sbi->flag & JFS_ERR_CONTINUE)
620 seq_printf(seq, ",errors=continue");
621 if (sbi->flag & JFS_ERR_PANIC)
622 seq_printf(seq, ",errors=panic");
623
624 #ifdef CONFIG_QUOTA
625 if (sbi->flag & JFS_USRQUOTA)
626 seq_puts(seq, ",usrquota");
627
628 if (sbi->flag & JFS_GRPQUOTA)
629 seq_puts(seq, ",grpquota");
630 #endif
631
632 return 0;
633 }
634
635 #ifdef CONFIG_QUOTA
636
637 /* Read data from quotafile - avoid pagecache and such because we cannot afford
638 * acquiring the locks... As quota files are never truncated and quota code
639 * itself serializes the operations (and noone else should touch the files)
640 * we don't have to be afraid of races */
641 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
642 size_t len, loff_t off)
643 {
644 struct inode *inode = sb_dqopt(sb)->files[type];
645 sector_t blk = off >> sb->s_blocksize_bits;
646 int err = 0;
647 int offset = off & (sb->s_blocksize - 1);
648 int tocopy;
649 size_t toread;
650 struct buffer_head tmp_bh;
651 struct buffer_head *bh;
652 loff_t i_size = i_size_read(inode);
653
654 if (off > i_size)
655 return 0;
656 if (off+len > i_size)
657 len = i_size-off;
658 toread = len;
659 while (toread > 0) {
660 tocopy = sb->s_blocksize - offset < toread ?
661 sb->s_blocksize - offset : toread;
662
663 tmp_bh.b_state = 0;
664 tmp_bh.b_size = 1 << inode->i_blkbits;
665 err = jfs_get_block(inode, blk, &tmp_bh, 0);
666 if (err)
667 return err;
668 if (!buffer_mapped(&tmp_bh)) /* A hole? */
669 memset(data, 0, tocopy);
670 else {
671 bh = sb_bread(sb, tmp_bh.b_blocknr);
672 if (!bh)
673 return -EIO;
674 memcpy(data, bh->b_data+offset, tocopy);
675 brelse(bh);
676 }
677 offset = 0;
678 toread -= tocopy;
679 data += tocopy;
680 blk++;
681 }
682 return len;
683 }
684
685 /* Write to quotafile */
686 static ssize_t jfs_quota_write(struct super_block *sb, int type,
687 const char *data, size_t len, loff_t off)
688 {
689 struct inode *inode = sb_dqopt(sb)->files[type];
690 sector_t blk = off >> sb->s_blocksize_bits;
691 int err = 0;
692 int offset = off & (sb->s_blocksize - 1);
693 int tocopy;
694 size_t towrite = len;
695 struct buffer_head tmp_bh;
696 struct buffer_head *bh;
697
698 mutex_lock(&inode->i_mutex);
699 while (towrite > 0) {
700 tocopy = sb->s_blocksize - offset < towrite ?
701 sb->s_blocksize - offset : towrite;
702
703 tmp_bh.b_state = 0;
704 tmp_bh.b_size = 1 << inode->i_blkbits;
705 err = jfs_get_block(inode, blk, &tmp_bh, 1);
706 if (err)
707 goto out;
708 if (offset || tocopy != sb->s_blocksize)
709 bh = sb_bread(sb, tmp_bh.b_blocknr);
710 else
711 bh = sb_getblk(sb, tmp_bh.b_blocknr);
712 if (!bh) {
713 err = -EIO;
714 goto out;
715 }
716 lock_buffer(bh);
717 memcpy(bh->b_data+offset, data, tocopy);
718 flush_dcache_page(bh->b_page);
719 set_buffer_uptodate(bh);
720 mark_buffer_dirty(bh);
721 unlock_buffer(bh);
722 brelse(bh);
723 offset = 0;
724 towrite -= tocopy;
725 data += tocopy;
726 blk++;
727 }
728 out:
729 if (len == towrite) {
730 mutex_unlock(&inode->i_mutex);
731 return err;
732 }
733 if (inode->i_size < off+len-towrite)
734 i_size_write(inode, off+len-towrite);
735 inode->i_version++;
736 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
737 mark_inode_dirty(inode);
738 mutex_unlock(&inode->i_mutex);
739 return len - towrite;
740 }
741
742 #endif
743
744 static const struct super_operations jfs_super_operations = {
745 .alloc_inode = jfs_alloc_inode,
746 .destroy_inode = jfs_destroy_inode,
747 .dirty_inode = jfs_dirty_inode,
748 .write_inode = jfs_write_inode,
749 .evict_inode = jfs_evict_inode,
750 .put_super = jfs_put_super,
751 .sync_fs = jfs_sync_fs,
752 .freeze_fs = jfs_freeze,
753 .unfreeze_fs = jfs_unfreeze,
754 .statfs = jfs_statfs,
755 .remount_fs = jfs_remount,
756 .show_options = jfs_show_options,
757 #ifdef CONFIG_QUOTA
758 .quota_read = jfs_quota_read,
759 .quota_write = jfs_quota_write,
760 #endif
761 };
762
763 static const struct export_operations jfs_export_operations = {
764 .fh_to_dentry = jfs_fh_to_dentry,
765 .fh_to_parent = jfs_fh_to_parent,
766 .get_parent = jfs_get_parent,
767 };
768
769 static struct file_system_type jfs_fs_type = {
770 .owner = THIS_MODULE,
771 .name = "jfs",
772 .mount = jfs_do_mount,
773 .kill_sb = kill_block_super,
774 .fs_flags = FS_REQUIRES_DEV,
775 };
776
777 static void init_once(void *foo)
778 {
779 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
780
781 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
782 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
783 init_rwsem(&jfs_ip->rdwrlock);
784 mutex_init(&jfs_ip->commit_mutex);
785 init_rwsem(&jfs_ip->xattr_sem);
786 spin_lock_init(&jfs_ip->ag_lock);
787 jfs_ip->active_ag = -1;
788 inode_init_once(&jfs_ip->vfs_inode);
789 }
790
791 static int __init init_jfs_fs(void)
792 {
793 int i;
794 int rc;
795
796 jfs_inode_cachep =
797 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
798 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
799 init_once);
800 if (jfs_inode_cachep == NULL)
801 return -ENOMEM;
802
803 /*
804 * Metapage initialization
805 */
806 rc = metapage_init();
807 if (rc) {
808 jfs_err("metapage_init failed w/rc = %d", rc);
809 goto free_slab;
810 }
811
812 /*
813 * Transaction Manager initialization
814 */
815 rc = txInit();
816 if (rc) {
817 jfs_err("txInit failed w/rc = %d", rc);
818 goto free_metapage;
819 }
820
821 /*
822 * I/O completion thread (endio)
823 */
824 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
825 if (IS_ERR(jfsIOthread)) {
826 rc = PTR_ERR(jfsIOthread);
827 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
828 goto end_txmngr;
829 }
830
831 if (commit_threads < 1)
832 commit_threads = num_online_cpus();
833 if (commit_threads > MAX_COMMIT_THREADS)
834 commit_threads = MAX_COMMIT_THREADS;
835
836 for (i = 0; i < commit_threads; i++) {
837 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
838 if (IS_ERR(jfsCommitThread[i])) {
839 rc = PTR_ERR(jfsCommitThread[i]);
840 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
841 commit_threads = i;
842 goto kill_committask;
843 }
844 }
845
846 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
847 if (IS_ERR(jfsSyncThread)) {
848 rc = PTR_ERR(jfsSyncThread);
849 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
850 goto kill_committask;
851 }
852
853 #ifdef PROC_FS_JFS
854 jfs_proc_init();
855 #endif
856
857 return register_filesystem(&jfs_fs_type);
858
859 kill_committask:
860 for (i = 0; i < commit_threads; i++)
861 kthread_stop(jfsCommitThread[i]);
862 kthread_stop(jfsIOthread);
863 end_txmngr:
864 txExit();
865 free_metapage:
866 metapage_exit();
867 free_slab:
868 kmem_cache_destroy(jfs_inode_cachep);
869 return rc;
870 }
871
872 static void __exit exit_jfs_fs(void)
873 {
874 int i;
875
876 jfs_info("exit_jfs_fs called");
877
878 txExit();
879 metapage_exit();
880
881 kthread_stop(jfsIOthread);
882 for (i = 0; i < commit_threads; i++)
883 kthread_stop(jfsCommitThread[i]);
884 kthread_stop(jfsSyncThread);
885 #ifdef PROC_FS_JFS
886 jfs_proc_clean();
887 #endif
888 unregister_filesystem(&jfs_fs_type);
889 kmem_cache_destroy(jfs_inode_cachep);
890 }
891
892 module_init(init_jfs_fs)
893 module_exit(exit_jfs_fs)
linux-next