?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PARISC] Zap unused variable warnings in pci.c
[linux-2.6/lfs.git] / fs / jfs / super.c
blobcff60c171943b9b23334428bd650ac829fc19b7b
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 <linux/exportfs.h>
31 #include <asm/uaccess.h>
32 #include <linux/seq_file.h>
33
34 #include "jfs_incore.h"
35 #include "jfs_filsys.h"
36 #include "jfs_inode.h"
37 #include "jfs_metapage.h"
38 #include "jfs_superblock.h"
39 #include "jfs_dmap.h"
40 #include "jfs_imap.h"
41 #include "jfs_acl.h"
42 #include "jfs_debug.h"
43
44 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
45 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
46 MODULE_LICENSE("GPL");
47
48 static struct kmem_cache * jfs_inode_cachep;
49
50 static const struct super_operations jfs_super_operations;
51 static struct export_operations jfs_export_operations;
52 static struct file_system_type jfs_fs_type;
53
54 #define MAX_COMMIT_THREADS 64
55 static int commit_threads = 0;
56 module_param(commit_threads, int, 0);
57 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
58
59 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
60 struct task_struct *jfsIOthread;
61 struct task_struct *jfsSyncThread;
62
63 #ifdef CONFIG_JFS_DEBUG
64 int jfsloglevel = JFS_LOGLEVEL_WARN;
65 module_param(jfsloglevel, int, 0644);
66 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
67 #endif
68
69 static void jfs_handle_error(struct super_block *sb)
70 {
71 struct jfs_sb_info *sbi = JFS_SBI(sb);
72
73 if (sb->s_flags & MS_RDONLY)
74 return;
75
76 updateSuper(sb, FM_DIRTY);
77
78 if (sbi->flag & JFS_ERR_PANIC)
79 panic("JFS (device %s): panic forced after error\n",
80 sb->s_id);
81 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
82 jfs_err("ERROR: (device %s): remounting filesystem "
83 "as read-only\n",
84 sb->s_id);
85 sb->s_flags |= MS_RDONLY;
86 }
87
88 /* nothing is done for continue beyond marking the superblock dirty */
89 }
90
91 void jfs_error(struct super_block *sb, const char * function, ...)
92 {
93 static char error_buf[256];
94 va_list args;
95
96 va_start(args, function);
97 vsnprintf(error_buf, sizeof(error_buf), function, args);
98 va_end(args);
99
100 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
101
102 jfs_handle_error(sb);
103 }
104
105 static struct inode *jfs_alloc_inode(struct super_block *sb)
106 {
107 struct jfs_inode_info *jfs_inode;
108
109 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
110 if (!jfs_inode)
111 return NULL;
112 return &jfs_inode->vfs_inode;
113 }
114
115 static void jfs_destroy_inode(struct inode *inode)
116 {
117 struct jfs_inode_info *ji = JFS_IP(inode);
118
119 BUG_ON(!list_empty(&ji->anon_inode_list));
120
121 spin_lock_irq(&ji->ag_lock);
122 if (ji->active_ag != -1) {
123 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
124 atomic_dec(&bmap->db_active[ji->active_ag]);
125 ji->active_ag = -1;
126 }
127 spin_unlock_irq(&ji->ag_lock);
128
129 #ifdef CONFIG_JFS_POSIX_ACL
130 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
131 posix_acl_release(ji->i_acl);
132 ji->i_acl = JFS_ACL_NOT_CACHED;
133 }
134 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
135 posix_acl_release(ji->i_default_acl);
136 ji->i_default_acl = JFS_ACL_NOT_CACHED;
137 }
138 #endif
139
140 kmem_cache_free(jfs_inode_cachep, ji);
141 }
142
143 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
144 {
145 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
146 s64 maxinodes;
147 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
148
149 jfs_info("In jfs_statfs");
150 buf->f_type = JFS_SUPER_MAGIC;
151 buf->f_bsize = sbi->bsize;
152 buf->f_blocks = sbi->bmap->db_mapsize;
153 buf->f_bfree = sbi->bmap->db_nfree;
154 buf->f_bavail = sbi->bmap->db_nfree;
155 /*
156 * If we really return the number of allocated & free inodes, some
157 * applications will fail because they won't see enough free inodes.
158 * We'll try to calculate some guess as to how may inodes we can
159 * really allocate
160 *
161 * buf->f_files = atomic_read(&imap->im_numinos);
162 * buf->f_ffree = atomic_read(&imap->im_numfree);
163 */
164 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
165 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
166 << L2INOSPEREXT), (s64) 0xffffffffLL);
167 buf->f_files = maxinodes;
168 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
169 atomic_read(&imap->im_numfree));
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 rc = jfs_umount(sb);
182 if (rc)
183 jfs_err("jfs_umount failed with return code %d", rc);
184 if (sbi->nls_tab)
185 unload_nls(sbi->nls_tab);
186 sbi->nls_tab = NULL;
187
188 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
189 iput(sbi->direct_inode);
190 sbi->direct_inode = NULL;
191
192 kfree(sbi);
193 }
194
195 enum {
196 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
197 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
198 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
199 };
200
201 static match_table_t tokens = {
202 {Opt_integrity, "integrity"},
203 {Opt_nointegrity, "nointegrity"},
204 {Opt_iocharset, "iocharset=%s"},
205 {Opt_resize, "resize=%u"},
206 {Opt_resize_nosize, "resize"},
207 {Opt_errors, "errors=%s"},
208 {Opt_ignore, "noquota"},
209 {Opt_ignore, "quota"},
210 {Opt_usrquota, "usrquota"},
211 {Opt_grpquota, "grpquota"},
212 {Opt_uid, "uid=%u"},
213 {Opt_gid, "gid=%u"},
214 {Opt_umask, "umask=%u"},
215 {Opt_err, NULL}
216 };
217
218 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
219 int *flag)
220 {
221 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
222 char *p;
223 struct jfs_sb_info *sbi = JFS_SBI(sb);
224
225 *newLVSize = 0;
226
227 if (!options)
228 return 1;
229
230 while ((p = strsep(&options, ",")) != NULL) {
231 substring_t args[MAX_OPT_ARGS];
232 int token;
233 if (!*p)
234 continue;
235
236 token = match_token(p, tokens, args);
237 switch (token) {
238 case Opt_integrity:
239 *flag &= ~JFS_NOINTEGRITY;
240 break;
241 case Opt_nointegrity:
242 *flag |= JFS_NOINTEGRITY;
243 break;
244 case Opt_ignore:
245 /* Silently ignore the quota options */
246 /* Don't do anything ;-) */
247 break;
248 case Opt_iocharset:
249 if (nls_map && nls_map != (void *) -1)
250 unload_nls(nls_map);
251 if (!strcmp(args[0].from, "none"))
252 nls_map = NULL;
253 else {
254 nls_map = load_nls(args[0].from);
255 if (!nls_map) {
256 printk(KERN_ERR
257 "JFS: charset not found\n");
258 goto cleanup;
259 }
260 }
261 break;
262 case Opt_resize:
263 {
264 char *resize = args[0].from;
265 *newLVSize = simple_strtoull(resize, &resize, 0);
266 break;
267 }
268 case Opt_resize_nosize:
269 {
270 *newLVSize = sb->s_bdev->bd_inode->i_size >>
271 sb->s_blocksize_bits;
272 if (*newLVSize == 0)
273 printk(KERN_ERR
274 "JFS: Cannot determine volume size\n");
275 break;
276 }
277 case Opt_errors:
278 {
279 char *errors = args[0].from;
280 if (!errors || !*errors)
281 goto cleanup;
282 if (!strcmp(errors, "continue")) {
283 *flag &= ~JFS_ERR_REMOUNT_RO;
284 *flag &= ~JFS_ERR_PANIC;
285 *flag |= JFS_ERR_CONTINUE;
286 } else if (!strcmp(errors, "remount-ro")) {
287 *flag &= ~JFS_ERR_CONTINUE;
288 *flag &= ~JFS_ERR_PANIC;
289 *flag |= JFS_ERR_REMOUNT_RO;
290 } else if (!strcmp(errors, "panic")) {
291 *flag &= ~JFS_ERR_CONTINUE;
292 *flag &= ~JFS_ERR_REMOUNT_RO;
293 *flag |= JFS_ERR_PANIC;
294 } else {
295 printk(KERN_ERR
296 "JFS: %s is an invalid error handler\n",
297 errors);
298 goto cleanup;
299 }
300 break;
301 }
302
303 #ifdef CONFIG_QUOTA
304 case Opt_quota:
305 case Opt_usrquota:
306 *flag |= JFS_USRQUOTA;
307 break;
308 case Opt_grpquota:
309 *flag |= JFS_GRPQUOTA;
310 break;
311 #else
312 case Opt_usrquota:
313 case Opt_grpquota:
314 case Opt_quota:
315 printk(KERN_ERR
316 "JFS: quota operations not supported\n");
317 break;
318 #endif
319 case Opt_uid:
320 {
321 char *uid = args[0].from;
322 sbi->uid = simple_strtoul(uid, &uid, 0);
323 break;
324 }
325 case Opt_gid:
326 {
327 char *gid = args[0].from;
328 sbi->gid = simple_strtoul(gid, &gid, 0);
329 break;
330 }
331 case Opt_umask:
332 {
333 char *umask = args[0].from;
334 sbi->umask = simple_strtoul(umask, &umask, 8);
335 if (sbi->umask & ~0777) {
336 printk(KERN_ERR
337 "JFS: Invalid value of umask\n");
338 goto cleanup;
339 }
340 break;
341 }
342 default:
343 printk("jfs: Unrecognized mount option \"%s\" "
344 " or missing value\n", p);
345 goto cleanup;
346 }
347 }
348
349 if (nls_map != (void *) -1) {
350 /* Discard old (if remount) */
351 if (sbi->nls_tab)
352 unload_nls(sbi->nls_tab);
353 sbi->nls_tab = nls_map;
354 }
355 return 1;
356
357 cleanup:
358 if (nls_map && nls_map != (void *) -1)
359 unload_nls(nls_map);
360 return 0;
361 }
362
363 static int jfs_remount(struct super_block *sb, int *flags, char *data)
364 {
365 s64 newLVSize = 0;
366 int rc = 0;
367 int flag = JFS_SBI(sb)->flag;
368
369 if (!parse_options(data, sb, &newLVSize, &flag)) {
370 return -EINVAL;
371 }
372 if (newLVSize) {
373 if (sb->s_flags & MS_RDONLY) {
374 printk(KERN_ERR
375 "JFS: resize requires volume to be mounted read-write\n");
376 return -EROFS;
377 }
378 rc = jfs_extendfs(sb, newLVSize, 0);
379 if (rc)
380 return rc;
381 }
382
383 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
384 /*
385 * Invalidate any previously read metadata. fsck may have
386 * changed the on-disk data since we mounted r/o
387 */
388 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
389
390 JFS_SBI(sb)->flag = flag;
391 return jfs_mount_rw(sb, 1);
392 }
393 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
394 rc = jfs_umount_rw(sb);
395 JFS_SBI(sb)->flag = flag;
396 return rc;
397 }
398 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
399 if (!(sb->s_flags & MS_RDONLY)) {
400 rc = jfs_umount_rw(sb);
401 if (rc)
402 return rc;
403 JFS_SBI(sb)->flag = flag;
404 return jfs_mount_rw(sb, 1);
405 }
406 JFS_SBI(sb)->flag = flag;
407
408 return 0;
409 }
410
411 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
412 {
413 struct jfs_sb_info *sbi;
414 struct inode *inode;
415 int rc;
416 s64 newLVSize = 0;
417 int flag;
418
419 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
420
421 if (!new_valid_dev(sb->s_bdev->bd_dev))
422 return -EOVERFLOW;
423
424 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
425 if (!sbi)
426 return -ENOMEM;
427 sb->s_fs_info = sbi;
428 sbi->sb = sb;
429 sbi->uid = sbi->gid = sbi->umask = -1;
430
431 /* initialize the mount flag and determine the default error handler */
432 flag = JFS_ERR_REMOUNT_RO;
433
434 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
435 kfree(sbi);
436 return -EINVAL;
437 }
438 sbi->flag = flag;
439
440 #ifdef CONFIG_JFS_POSIX_ACL
441 sb->s_flags |= MS_POSIXACL;
442 #endif
443
444 if (newLVSize) {
445 printk(KERN_ERR "resize option for remount only\n");
446 return -EINVAL;
447 }
448
449 /*
450 * Initialize blocksize to 4K.
451 */
452 sb_set_blocksize(sb, PSIZE);
453
454 /*
455 * Set method vectors.
456 */
457 sb->s_op = &jfs_super_operations;
458 sb->s_export_op = &jfs_export_operations;
459
460 /*
461 * Initialize direct-mapping inode/address-space
462 */
463 inode = new_inode(sb);
464 if (inode == NULL)
465 goto out_kfree;
466 inode->i_ino = 0;
467 inode->i_nlink = 1;
468 inode->i_size = sb->s_bdev->bd_inode->i_size;
469 inode->i_mapping->a_ops = &jfs_metapage_aops;
470 insert_inode_hash(inode);
471 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
472
473 sbi->direct_inode = inode;
474
475 rc = jfs_mount(sb);
476 if (rc) {
477 if (!silent) {
478 jfs_err("jfs_mount failed w/return code = %d", rc);
479 }
480 goto out_mount_failed;
481 }
482 if (sb->s_flags & MS_RDONLY)
483 sbi->log = NULL;
484 else {
485 rc = jfs_mount_rw(sb, 0);
486 if (rc) {
487 if (!silent) {
488 jfs_err("jfs_mount_rw failed, return code = %d",
489 rc);
490 }
491 goto out_no_rw;
492 }
493 }
494
495 sb->s_magic = JFS_SUPER_MAGIC;
496
497 inode = iget(sb, ROOT_I);
498 if (!inode || is_bad_inode(inode))
499 goto out_no_root;
500 sb->s_root = d_alloc_root(inode);
501 if (!sb->s_root)
502 goto out_no_root;
503
504 if (sbi->mntflag & JFS_OS2)
505 sb->s_root->d_op = &jfs_ci_dentry_operations;
506
507 /* logical blocks are represented by 40 bits in pxd_t, etc. */
508 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
509 #if BITS_PER_LONG == 32
510 /*
511 * Page cache is indexed by long.
512 * I would use MAX_LFS_FILESIZE, but it's only half as big
513 */
514 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
515 #endif
516 sb->s_time_gran = 1;
517 return 0;
518
519 out_no_root:
520 jfs_err("jfs_read_super: get root inode failed");
521 if (inode)
522 iput(inode);
523
524 out_no_rw:
525 rc = jfs_umount(sb);
526 if (rc) {
527 jfs_err("jfs_umount failed with return code %d", rc);
528 }
529 out_mount_failed:
530 filemap_write_and_wait(sbi->direct_inode->i_mapping);
531 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
532 make_bad_inode(sbi->direct_inode);
533 iput(sbi->direct_inode);
534 sbi->direct_inode = NULL;
535 out_kfree:
536 if (sbi->nls_tab)
537 unload_nls(sbi->nls_tab);
538 kfree(sbi);
539 return -EINVAL;
540 }
541
542 static void jfs_write_super_lockfs(struct super_block *sb)
543 {
544 struct jfs_sb_info *sbi = JFS_SBI(sb);
545 struct jfs_log *log = sbi->log;
546
547 if (!(sb->s_flags & MS_RDONLY)) {
548 txQuiesce(sb);
549 lmLogShutdown(log);
550 updateSuper(sb, FM_CLEAN);
551 }
552 }
553
554 static void jfs_unlockfs(struct super_block *sb)
555 {
556 struct jfs_sb_info *sbi = JFS_SBI(sb);
557 struct jfs_log *log = sbi->log;
558 int rc = 0;
559
560 if (!(sb->s_flags & MS_RDONLY)) {
561 updateSuper(sb, FM_MOUNT);
562 if ((rc = lmLogInit(log)))
563 jfs_err("jfs_unlock failed with return code %d", rc);
564 else
565 txResume(sb);
566 }
567 }
568
569 static int jfs_get_sb(struct file_system_type *fs_type,
570 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
571 {
572 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
573 mnt);
574 }
575
576 static int jfs_sync_fs(struct super_block *sb, int wait)
577 {
578 struct jfs_log *log = JFS_SBI(sb)->log;
579
580 /* log == NULL indicates read-only mount */
581 if (log) {
582 jfs_flush_journal(log, wait);
583 jfs_syncpt(log, 0);
584 }
585
586 return 0;
587 }
588
589 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
590 {
591 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
592
593 if (sbi->uid != -1)
594 seq_printf(seq, ",uid=%d", sbi->uid);
595 if (sbi->gid != -1)
596 seq_printf(seq, ",gid=%d", sbi->gid);
597 if (sbi->umask != -1)
598 seq_printf(seq, ",umask=%03o", sbi->umask);
599 if (sbi->flag & JFS_NOINTEGRITY)
600 seq_puts(seq, ",nointegrity");
601
602 #ifdef CONFIG_QUOTA
603 if (sbi->flag & JFS_USRQUOTA)
604 seq_puts(seq, ",usrquota");
605
606 if (sbi->flag & JFS_GRPQUOTA)
607 seq_puts(seq, ",grpquota");
608 #endif
609
610 return 0;
611 }
612
613 #ifdef CONFIG_QUOTA
614
615 /* Read data from quotafile - avoid pagecache and such because we cannot afford
616 * acquiring the locks... As quota files are never truncated and quota code
617 * itself serializes the operations (and noone else should touch the files)
618 * we don't have to be afraid of races */
619 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
620 size_t len, loff_t off)
621 {
622 struct inode *inode = sb_dqopt(sb)->files[type];
623 sector_t blk = off >> sb->s_blocksize_bits;
624 int err = 0;
625 int offset = off & (sb->s_blocksize - 1);
626 int tocopy;
627 size_t toread;
628 struct buffer_head tmp_bh;
629 struct buffer_head *bh;
630 loff_t i_size = i_size_read(inode);
631
632 if (off > i_size)
633 return 0;
634 if (off+len > i_size)
635 len = i_size-off;
636 toread = len;
637 while (toread > 0) {
638 tocopy = sb->s_blocksize - offset < toread ?
639 sb->s_blocksize - offset : toread;
640
641 tmp_bh.b_state = 0;
642 tmp_bh.b_size = 1 << inode->i_blkbits;
643 err = jfs_get_block(inode, blk, &tmp_bh, 0);
644 if (err)
645 return err;
646 if (!buffer_mapped(&tmp_bh)) /* A hole? */
647 memset(data, 0, tocopy);
648 else {
649 bh = sb_bread(sb, tmp_bh.b_blocknr);
650 if (!bh)
651 return -EIO;
652 memcpy(data, bh->b_data+offset, tocopy);
653 brelse(bh);
654 }
655 offset = 0;
656 toread -= tocopy;
657 data += tocopy;
658 blk++;
659 }
660 return len;
661 }
662
663 /* Write to quotafile */
664 static ssize_t jfs_quota_write(struct super_block *sb, int type,
665 const char *data, size_t len, loff_t off)
666 {
667 struct inode *inode = sb_dqopt(sb)->files[type];
668 sector_t blk = off >> sb->s_blocksize_bits;
669 int err = 0;
670 int offset = off & (sb->s_blocksize - 1);
671 int tocopy;
672 size_t towrite = len;
673 struct buffer_head tmp_bh;
674 struct buffer_head *bh;
675
676 mutex_lock(&inode->i_mutex);
677 while (towrite > 0) {
678 tocopy = sb->s_blocksize - offset < towrite ?
679 sb->s_blocksize - offset : towrite;
680
681 tmp_bh.b_state = 0;
682 tmp_bh.b_size = 1 << inode->i_blkbits;
683 err = jfs_get_block(inode, blk, &tmp_bh, 1);
684 if (err)
685 goto out;
686 if (offset || tocopy != sb->s_blocksize)
687 bh = sb_bread(sb, tmp_bh.b_blocknr);
688 else
689 bh = sb_getblk(sb, tmp_bh.b_blocknr);
690 if (!bh) {
691 err = -EIO;
692 goto out;
693 }
694 lock_buffer(bh);
695 memcpy(bh->b_data+offset, data, tocopy);
696 flush_dcache_page(bh->b_page);
697 set_buffer_uptodate(bh);
698 mark_buffer_dirty(bh);
699 unlock_buffer(bh);
700 brelse(bh);
701 offset = 0;
702 towrite -= tocopy;
703 data += tocopy;
704 blk++;
705 }
706 out:
707 if (len == towrite)
708 return err;
709 if (inode->i_size < off+len-towrite)
710 i_size_write(inode, off+len-towrite);
711 inode->i_version++;
712 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
713 mark_inode_dirty(inode);
714 mutex_unlock(&inode->i_mutex);
715 return len - towrite;
716 }
717
718 #endif
719
720 static const struct super_operations jfs_super_operations = {
721 .alloc_inode = jfs_alloc_inode,
722 .destroy_inode = jfs_destroy_inode,
723 .read_inode = jfs_read_inode,
724 .dirty_inode = jfs_dirty_inode,
725 .write_inode = jfs_write_inode,
726 .delete_inode = jfs_delete_inode,
727 .put_super = jfs_put_super,
728 .sync_fs = jfs_sync_fs,
729 .write_super_lockfs = jfs_write_super_lockfs,
730 .unlockfs = jfs_unlockfs,
731 .statfs = jfs_statfs,
732 .remount_fs = jfs_remount,
733 .show_options = jfs_show_options,
734 #ifdef CONFIG_QUOTA
735 .quota_read = jfs_quota_read,
736 .quota_write = jfs_quota_write,
737 #endif
738 };
739
740 static struct export_operations jfs_export_operations = {
741 .get_dentry = jfs_get_dentry,
742 .get_parent = jfs_get_parent,
743 };
744
745 static struct file_system_type jfs_fs_type = {
746 .owner = THIS_MODULE,
747 .name = "jfs",
748 .get_sb = jfs_get_sb,
749 .kill_sb = kill_block_super,
750 .fs_flags = FS_REQUIRES_DEV,
751 };
752
753 static void init_once(struct kmem_cache *cachep, void *foo)
754 {
755 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
756
757 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
758 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
759 init_rwsem(&jfs_ip->rdwrlock);
760 mutex_init(&jfs_ip->commit_mutex);
761 init_rwsem(&jfs_ip->xattr_sem);
762 spin_lock_init(&jfs_ip->ag_lock);
763 jfs_ip->active_ag = -1;
764 #ifdef CONFIG_JFS_POSIX_ACL
765 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
766 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
767 #endif
768 inode_init_once(&jfs_ip->vfs_inode);
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);
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)
Log-structured file system for Linux