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[cor_2_6_31.git] / fs / jfs / super.c
blob37e6dcda8fc84f587508f8db58abdecee69524e1
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/fs.h>
21 #include <linux/module.h>
22 #include <linux/parser.h>
23 #include <linux/completion.h>
24 #include <linux/vfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/mount.h>
27 #include <linux/moduleparam.h>
28 #include <linux/kthread.h>
29 #include <linux/posix_acl.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/crc32.h>
33 #include <asm/uaccess.h>
34 #include <linux/seq_file.h>
35 #include <linux/smp_lock.h>
36
37 #include "jfs_incore.h"
38 #include "jfs_filsys.h"
39 #include "jfs_inode.h"
40 #include "jfs_metapage.h"
41 #include "jfs_superblock.h"
42 #include "jfs_dmap.h"
43 #include "jfs_imap.h"
44 #include "jfs_acl.h"
45 #include "jfs_debug.h"
46
47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
49 MODULE_LICENSE("GPL");
50
51 static struct kmem_cache * jfs_inode_cachep;
52
53 static const struct super_operations jfs_super_operations;
54 static const struct export_operations jfs_export_operations;
55 static struct file_system_type jfs_fs_type;
56
57 #define MAX_COMMIT_THREADS 64
58 static int commit_threads = 0;
59 module_param(commit_threads, int, 0);
60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
61
62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
63 struct task_struct *jfsIOthread;
64 struct task_struct *jfsSyncThread;
65
66 #ifdef CONFIG_JFS_DEBUG
67 int jfsloglevel = JFS_LOGLEVEL_WARN;
68 module_param(jfsloglevel, int, 0644);
69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
70 #endif
71
72 static void jfs_handle_error(struct super_block *sb)
73 {
74 struct jfs_sb_info *sbi = JFS_SBI(sb);
75
76 if (sb->s_flags & MS_RDONLY)
77 return;
78
79 updateSuper(sb, FM_DIRTY);
80
81 if (sbi->flag & JFS_ERR_PANIC)
82 panic("JFS (device %s): panic forced after error\n",
83 sb->s_id);
84 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
85 jfs_err("ERROR: (device %s): remounting filesystem "
86 "as read-only\n",
87 sb->s_id);
88 sb->s_flags |= MS_RDONLY;
89 }
90
91 /* nothing is done for continue beyond marking the superblock dirty */
92 }
93
94 void jfs_error(struct super_block *sb, const char * function, ...)
95 {
96 static char error_buf[256];
97 va_list args;
98
99 va_start(args, function);
100 vsnprintf(error_buf, sizeof(error_buf), function, args);
101 va_end(args);
102
103 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
104
105 jfs_handle_error(sb);
106 }
107
108 static struct inode *jfs_alloc_inode(struct super_block *sb)
109 {
110 struct jfs_inode_info *jfs_inode;
111
112 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
113 if (!jfs_inode)
114 return NULL;
115 return &jfs_inode->vfs_inode;
116 }
117
118 static void jfs_destroy_inode(struct inode *inode)
119 {
120 struct jfs_inode_info *ji = JFS_IP(inode);
121
122 BUG_ON(!list_empty(&ji->anon_inode_list));
123
124 spin_lock_irq(&ji->ag_lock);
125 if (ji->active_ag != -1) {
126 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
127 atomic_dec(&bmap->db_active[ji->active_ag]);
128 ji->active_ag = -1;
129 }
130 spin_unlock_irq(&ji->ag_lock);
131 kmem_cache_free(jfs_inode_cachep, ji);
132 }
133
134 static 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 lock_kernel();
177
178 rc = jfs_umount(sb);
179 if (rc)
180 jfs_err("jfs_umount failed with return code %d", rc);
181 if (sbi->nls_tab)
182 unload_nls(sbi->nls_tab);
183 sbi->nls_tab = NULL;
184
185 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
186 iput(sbi->direct_inode);
187 sbi->direct_inode = NULL;
188
189 kfree(sbi);
190
191 unlock_kernel();
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 const 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 int ret;
368
369 if (!parse_options(data, sb, &newLVSize, &flag)) {
370 return -EINVAL;
371 }
372 lock_kernel();
373 if (newLVSize) {
374 if (sb->s_flags & MS_RDONLY) {
375 printk(KERN_ERR
376 "JFS: resize requires volume to be mounted read-write\n");
377 unlock_kernel();
378 return -EROFS;
379 }
380 rc = jfs_extendfs(sb, newLVSize, 0);
381 if (rc) {
382 unlock_kernel();
383 return rc;
384 }
385 }
386
387 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
388 /*
389 * Invalidate any previously read metadata. fsck may have
390 * changed the on-disk data since we mounted r/o
391 */
392 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
393
394 JFS_SBI(sb)->flag = flag;
395 ret = jfs_mount_rw(sb, 1);
396 unlock_kernel();
397 return ret;
398 }
399 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
400 rc = jfs_umount_rw(sb);
401 JFS_SBI(sb)->flag = flag;
402 unlock_kernel();
403 return rc;
404 }
405 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
406 if (!(sb->s_flags & MS_RDONLY)) {
407 rc = jfs_umount_rw(sb);
408 if (rc) {
409 unlock_kernel();
410 return rc;
411 }
412 JFS_SBI(sb)->flag = flag;
413 ret = jfs_mount_rw(sb, 1);
414 unlock_kernel();
415 return ret;
416 }
417 JFS_SBI(sb)->flag = flag;
418
419 unlock_kernel();
420 return 0;
421 }
422
423 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
424 {
425 struct jfs_sb_info *sbi;
426 struct inode *inode;
427 int rc;
428 s64 newLVSize = 0;
429 int flag, ret = -EINVAL;
430
431 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
432
433 if (!new_valid_dev(sb->s_bdev->bd_dev))
434 return -EOVERFLOW;
435
436 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
437 if (!sbi)
438 return -ENOMEM;
439 sb->s_fs_info = sbi;
440 sbi->sb = sb;
441 sbi->uid = sbi->gid = sbi->umask = -1;
442
443 /* initialize the mount flag and determine the default error handler */
444 flag = JFS_ERR_REMOUNT_RO;
445
446 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
447 kfree(sbi);
448 return -EINVAL;
449 }
450 sbi->flag = flag;
451
452 #ifdef CONFIG_JFS_POSIX_ACL
453 sb->s_flags |= MS_POSIXACL;
454 #endif
455
456 if (newLVSize) {
457 printk(KERN_ERR "resize option for remount only\n");
458 return -EINVAL;
459 }
460
461 /*
462 * Initialize blocksize to 4K.
463 */
464 sb_set_blocksize(sb, PSIZE);
465
466 /*
467 * Set method vectors.
468 */
469 sb->s_op = &jfs_super_operations;
470 sb->s_export_op = &jfs_export_operations;
471
472 /*
473 * Initialize direct-mapping inode/address-space
474 */
475 inode = new_inode(sb);
476 if (inode == NULL) {
477 ret = -ENOMEM;
478 goto out_kfree;
479 }
480 inode->i_ino = 0;
481 inode->i_nlink = 1;
482 inode->i_size = sb->s_bdev->bd_inode->i_size;
483 inode->i_mapping->a_ops = &jfs_metapage_aops;
484 insert_inode_hash(inode);
485 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
486
487 sbi->direct_inode = inode;
488
489 rc = jfs_mount(sb);
490 if (rc) {
491 if (!silent) {
492 jfs_err("jfs_mount failed w/return code = %d", rc);
493 }
494 goto out_mount_failed;
495 }
496 if (sb->s_flags & MS_RDONLY)
497 sbi->log = NULL;
498 else {
499 rc = jfs_mount_rw(sb, 0);
500 if (rc) {
501 if (!silent) {
502 jfs_err("jfs_mount_rw failed, return code = %d",
503 rc);
504 }
505 goto out_no_rw;
506 }
507 }
508
509 sb->s_magic = JFS_SUPER_MAGIC;
510
511 inode = jfs_iget(sb, ROOT_I);
512 if (IS_ERR(inode)) {
513 ret = PTR_ERR(inode);
514 goto out_no_rw;
515 }
516 sb->s_root = d_alloc_root(inode);
517 if (!sb->s_root)
518 goto out_no_root;
519
520 if (sbi->mntflag & JFS_OS2)
521 sb->s_root->d_op = &jfs_ci_dentry_operations;
522
523 /* logical blocks are represented by 40 bits in pxd_t, etc. */
524 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
525 #if BITS_PER_LONG == 32
526 /*
527 * Page cache is indexed by long.
528 * I would use MAX_LFS_FILESIZE, but it's only half as big
529 */
530 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
531 #endif
532 sb->s_time_gran = 1;
533 return 0;
534
535 out_no_root:
536 jfs_err("jfs_read_super: get root dentry failed");
537 iput(inode);
538
539 out_no_rw:
540 rc = jfs_umount(sb);
541 if (rc) {
542 jfs_err("jfs_umount failed with return code %d", rc);
543 }
544 out_mount_failed:
545 filemap_write_and_wait(sbi->direct_inode->i_mapping);
546 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
547 make_bad_inode(sbi->direct_inode);
548 iput(sbi->direct_inode);
549 sbi->direct_inode = NULL;
550 out_kfree:
551 if (sbi->nls_tab)
552 unload_nls(sbi->nls_tab);
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 int jfs_get_sb(struct file_system_type *fs_type,
587 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
588 {
589 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
590 mnt);
591 }
592
593 static int jfs_sync_fs(struct super_block *sb, int wait)
594 {
595 struct jfs_log *log = JFS_SBI(sb)->log;
596
597 /* log == NULL indicates read-only mount */
598 if (log) {
599 jfs_flush_journal(log, wait);
600 jfs_syncpt(log, 0);
601 }
602
603 return 0;
604 }
605
606 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
607 {
608 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
609
610 if (sbi->uid != -1)
611 seq_printf(seq, ",uid=%d", sbi->uid);
612 if (sbi->gid != -1)
613 seq_printf(seq, ",gid=%d", sbi->gid);
614 if (sbi->umask != -1)
615 seq_printf(seq, ",umask=%03o", sbi->umask);
616 if (sbi->flag & JFS_NOINTEGRITY)
617 seq_puts(seq, ",nointegrity");
618 if (sbi->nls_tab)
619 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
620 if (sbi->flag & JFS_ERR_CONTINUE)
621 seq_printf(seq, ",errors=continue");
622 if (sbi->flag & JFS_ERR_PANIC)
623 seq_printf(seq, ",errors=panic");
624
625 #ifdef CONFIG_QUOTA
626 if (sbi->flag & JFS_USRQUOTA)
627 seq_puts(seq, ",usrquota");
628
629 if (sbi->flag & JFS_GRPQUOTA)
630 seq_puts(seq, ",grpquota");
631 #endif
632
633 return 0;
634 }
635
636 #ifdef CONFIG_QUOTA
637
638 /* Read data from quotafile - avoid pagecache and such because we cannot afford
639 * acquiring the locks... As quota files are never truncated and quota code
640 * itself serializes the operations (and noone else should touch the files)
641 * we don't have to be afraid of races */
642 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
643 size_t len, loff_t off)
644 {
645 struct inode *inode = sb_dqopt(sb)->files[type];
646 sector_t blk = off >> sb->s_blocksize_bits;
647 int err = 0;
648 int offset = off & (sb->s_blocksize - 1);
649 int tocopy;
650 size_t toread;
651 struct buffer_head tmp_bh;
652 struct buffer_head *bh;
653 loff_t i_size = i_size_read(inode);
654
655 if (off > i_size)
656 return 0;
657 if (off+len > i_size)
658 len = i_size-off;
659 toread = len;
660 while (toread > 0) {
661 tocopy = sb->s_blocksize - offset < toread ?
662 sb->s_blocksize - offset : toread;
663
664 tmp_bh.b_state = 0;
665 tmp_bh.b_size = 1 << inode->i_blkbits;
666 err = jfs_get_block(inode, blk, &tmp_bh, 0);
667 if (err)
668 return err;
669 if (!buffer_mapped(&tmp_bh)) /* A hole? */
670 memset(data, 0, tocopy);
671 else {
672 bh = sb_bread(sb, tmp_bh.b_blocknr);
673 if (!bh)
674 return -EIO;
675 memcpy(data, bh->b_data+offset, tocopy);
676 brelse(bh);
677 }
678 offset = 0;
679 toread -= tocopy;
680 data += tocopy;
681 blk++;
682 }
683 return len;
684 }
685
686 /* Write to quotafile */
687 static ssize_t jfs_quota_write(struct super_block *sb, int type,
688 const char *data, size_t len, loff_t off)
689 {
690 struct inode *inode = sb_dqopt(sb)->files[type];
691 sector_t blk = off >> sb->s_blocksize_bits;
692 int err = 0;
693 int offset = off & (sb->s_blocksize - 1);
694 int tocopy;
695 size_t towrite = len;
696 struct buffer_head tmp_bh;
697 struct buffer_head *bh;
698
699 mutex_lock(&inode->i_mutex);
700 while (towrite > 0) {
701 tocopy = sb->s_blocksize - offset < towrite ?
702 sb->s_blocksize - offset : towrite;
703
704 tmp_bh.b_state = 0;
705 tmp_bh.b_size = 1 << inode->i_blkbits;
706 err = jfs_get_block(inode, blk, &tmp_bh, 1);
707 if (err)
708 goto out;
709 if (offset || tocopy != sb->s_blocksize)
710 bh = sb_bread(sb, tmp_bh.b_blocknr);
711 else
712 bh = sb_getblk(sb, tmp_bh.b_blocknr);
713 if (!bh) {
714 err = -EIO;
715 goto out;
716 }
717 lock_buffer(bh);
718 memcpy(bh->b_data+offset, data, tocopy);
719 flush_dcache_page(bh->b_page);
720 set_buffer_uptodate(bh);
721 mark_buffer_dirty(bh);
722 unlock_buffer(bh);
723 brelse(bh);
724 offset = 0;
725 towrite -= tocopy;
726 data += tocopy;
727 blk++;
728 }
729 out:
730 if (len == towrite) {
731 mutex_unlock(&inode->i_mutex);
732 return err;
733 }
734 if (inode->i_size < off+len-towrite)
735 i_size_write(inode, off+len-towrite);
736 inode->i_version++;
737 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
738 mark_inode_dirty(inode);
739 mutex_unlock(&inode->i_mutex);
740 return len - towrite;
741 }
742
743 #endif
744
745 static const struct super_operations jfs_super_operations = {
746 .alloc_inode = jfs_alloc_inode,
747 .destroy_inode = jfs_destroy_inode,
748 .dirty_inode = jfs_dirty_inode,
749 .write_inode = jfs_write_inode,
750 .delete_inode = jfs_delete_inode,
751 .put_super = jfs_put_super,
752 .sync_fs = jfs_sync_fs,
753 .freeze_fs = jfs_freeze,
754 .unfreeze_fs = jfs_unfreeze,
755 .statfs = jfs_statfs,
756 .remount_fs = jfs_remount,
757 .show_options = jfs_show_options,
758 #ifdef CONFIG_QUOTA
759 .quota_read = jfs_quota_read,
760 .quota_write = jfs_quota_write,
761 #endif
762 };
763
764 static const struct export_operations jfs_export_operations = {
765 .fh_to_dentry = jfs_fh_to_dentry,
766 .fh_to_parent = jfs_fh_to_parent,
767 .get_parent = jfs_get_parent,
768 };
769
770 static struct file_system_type jfs_fs_type = {
771 .owner = THIS_MODULE,
772 .name = "jfs",
773 .get_sb = jfs_get_sb,
774 .kill_sb = kill_block_super,
775 .fs_flags = FS_REQUIRES_DEV,
776 };
777
778 static void init_once(void *foo)
779 {
780 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
781
782 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
783 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
784 init_rwsem(&jfs_ip->rdwrlock);
785 mutex_init(&jfs_ip->commit_mutex);
786 init_rwsem(&jfs_ip->xattr_sem);
787 spin_lock_init(&jfs_ip->ag_lock);
788 jfs_ip->active_ag = -1;
789 inode_init_once(&jfs_ip->vfs_inode);
790 }
791
792 static int __init init_jfs_fs(void)
793 {
794 int i;
795 int rc;
796
797 jfs_inode_cachep =
798 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
799 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
800 init_once);
801 if (jfs_inode_cachep == NULL)
802 return -ENOMEM;
803
804 /*
805 * Metapage initialization
806 */
807 rc = metapage_init();
808 if (rc) {
809 jfs_err("metapage_init failed w/rc = %d", rc);
810 goto free_slab;
811 }
812
813 /*
814 * Transaction Manager initialization
815 */
816 rc = txInit();
817 if (rc) {
818 jfs_err("txInit failed w/rc = %d", rc);
819 goto free_metapage;
820 }
821
822 /*
823 * I/O completion thread (endio)
824 */
825 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
826 if (IS_ERR(jfsIOthread)) {
827 rc = PTR_ERR(jfsIOthread);
828 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
829 goto end_txmngr;
830 }
831
832 if (commit_threads < 1)
833 commit_threads = num_online_cpus();
834 if (commit_threads > MAX_COMMIT_THREADS)
835 commit_threads = MAX_COMMIT_THREADS;
836
837 for (i = 0; i < commit_threads; i++) {
838 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
839 if (IS_ERR(jfsCommitThread[i])) {
840 rc = PTR_ERR(jfsCommitThread[i]);
841 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
842 commit_threads = i;
843 goto kill_committask;
844 }
845 }
846
847 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
848 if (IS_ERR(jfsSyncThread)) {
849 rc = PTR_ERR(jfsSyncThread);
850 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
851 goto kill_committask;
852 }
853
854 #ifdef PROC_FS_JFS
855 jfs_proc_init();
856 #endif
857
858 return register_filesystem(&jfs_fs_type);
859
860 kill_committask:
861 for (i = 0; i < commit_threads; i++)
862 kthread_stop(jfsCommitThread[i]);
863 kthread_stop(jfsIOthread);
864 end_txmngr:
865 txExit();
866 free_metapage:
867 metapage_exit();
868 free_slab:
869 kmem_cache_destroy(jfs_inode_cachep);
870 return rc;
871 }
872
873 static void __exit exit_jfs_fs(void)
874 {
875 int i;
876
877 jfs_info("exit_jfs_fs called");
878
879 txExit();
880 metapage_exit();
881
882 kthread_stop(jfsIOthread);
883 for (i = 0; i < commit_threads; i++)
884 kthread_stop(jfsCommitThread[i]);
885 kthread_stop(jfsSyncThread);
886 #ifdef PROC_FS_JFS
887 jfs_proc_clean();
888 #endif
889 unregister_filesystem(&jfs_fs_type);
890 kmem_cache_destroy(jfs_inode_cachep);
891 }
892
893 module_init(init_jfs_fs)
894 module_exit(exit_jfs_fs)
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