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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / fs / jfs / super.c
blob50ea65451732edf196c7750c2e1f0ee60b547bba
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 const 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, ret = -EINVAL;
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 ret = -ENOMEM;
466 goto out_kfree;
467 }
468 inode->i_ino = 0;
469 inode->i_nlink = 1;
470 inode->i_size = sb->s_bdev->bd_inode->i_size;
471 inode->i_mapping->a_ops = &jfs_metapage_aops;
472 insert_inode_hash(inode);
473 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
474
475 sbi->direct_inode = inode;
476
477 rc = jfs_mount(sb);
478 if (rc) {
479 if (!silent) {
480 jfs_err("jfs_mount failed w/return code = %d", rc);
481 }
482 goto out_mount_failed;
483 }
484 if (sb->s_flags & MS_RDONLY)
485 sbi->log = NULL;
486 else {
487 rc = jfs_mount_rw(sb, 0);
488 if (rc) {
489 if (!silent) {
490 jfs_err("jfs_mount_rw failed, return code = %d",
491 rc);
492 }
493 goto out_no_rw;
494 }
495 }
496
497 sb->s_magic = JFS_SUPER_MAGIC;
498
499 inode = jfs_iget(sb, ROOT_I);
500 if (IS_ERR(inode)) {
501 ret = PTR_ERR(inode);
502 goto out_no_root;
503 }
504 sb->s_root = d_alloc_root(inode);
505 if (!sb->s_root)
506 goto out_no_root;
507
508 if (sbi->mntflag & JFS_OS2)
509 sb->s_root->d_op = &jfs_ci_dentry_operations;
510
511 /* logical blocks are represented by 40 bits in pxd_t, etc. */
512 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
513 #if BITS_PER_LONG == 32
514 /*
515 * Page cache is indexed by long.
516 * I would use MAX_LFS_FILESIZE, but it's only half as big
517 */
518 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
519 #endif
520 sb->s_time_gran = 1;
521 return 0;
522
523 out_no_root:
524 jfs_err("jfs_read_super: get root inode failed");
525 if (inode)
526 iput(inode);
527
528 out_no_rw:
529 rc = jfs_umount(sb);
530 if (rc) {
531 jfs_err("jfs_umount failed with return code %d", rc);
532 }
533 out_mount_failed:
534 filemap_write_and_wait(sbi->direct_inode->i_mapping);
535 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
536 make_bad_inode(sbi->direct_inode);
537 iput(sbi->direct_inode);
538 sbi->direct_inode = NULL;
539 out_kfree:
540 if (sbi->nls_tab)
541 unload_nls(sbi->nls_tab);
542 kfree(sbi);
543 return ret;
544 }
545
546 static void jfs_write_super_lockfs(struct super_block *sb)
547 {
548 struct jfs_sb_info *sbi = JFS_SBI(sb);
549 struct jfs_log *log = sbi->log;
550
551 if (!(sb->s_flags & MS_RDONLY)) {
552 txQuiesce(sb);
553 lmLogShutdown(log);
554 updateSuper(sb, FM_CLEAN);
555 }
556 }
557
558 static void jfs_unlockfs(struct super_block *sb)
559 {
560 struct jfs_sb_info *sbi = JFS_SBI(sb);
561 struct jfs_log *log = sbi->log;
562 int rc = 0;
563
564 if (!(sb->s_flags & MS_RDONLY)) {
565 updateSuper(sb, FM_MOUNT);
566 if ((rc = lmLogInit(log)))
567 jfs_err("jfs_unlock failed with return code %d", rc);
568 else
569 txResume(sb);
570 }
571 }
572
573 static int jfs_get_sb(struct file_system_type *fs_type,
574 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
575 {
576 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
577 mnt);
578 }
579
580 static int jfs_sync_fs(struct super_block *sb, int wait)
581 {
582 struct jfs_log *log = JFS_SBI(sb)->log;
583
584 /* log == NULL indicates read-only mount */
585 if (log) {
586 jfs_flush_journal(log, wait);
587 jfs_syncpt(log, 0);
588 }
589
590 return 0;
591 }
592
593 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
594 {
595 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
596
597 if (sbi->uid != -1)
598 seq_printf(seq, ",uid=%d", sbi->uid);
599 if (sbi->gid != -1)
600 seq_printf(seq, ",gid=%d", sbi->gid);
601 if (sbi->umask != -1)
602 seq_printf(seq, ",umask=%03o", sbi->umask);
603 if (sbi->flag & JFS_NOINTEGRITY)
604 seq_puts(seq, ",nointegrity");
605 if (sbi->nls_tab)
606 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
607 if (sbi->flag & JFS_ERR_CONTINUE)
608 seq_printf(seq, ",errors=continue");
609 if (sbi->flag & JFS_ERR_PANIC)
610 seq_printf(seq, ",errors=panic");
611
612 #ifdef CONFIG_QUOTA
613 if (sbi->flag & JFS_USRQUOTA)
614 seq_puts(seq, ",usrquota");
615
616 if (sbi->flag & JFS_GRPQUOTA)
617 seq_puts(seq, ",grpquota");
618 #endif
619
620 return 0;
621 }
622
623 #ifdef CONFIG_QUOTA
624
625 /* Read data from quotafile - avoid pagecache and such because we cannot afford
626 * acquiring the locks... As quota files are never truncated and quota code
627 * itself serializes the operations (and noone else should touch the files)
628 * we don't have to be afraid of races */
629 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
630 size_t len, loff_t off)
631 {
632 struct inode *inode = sb_dqopt(sb)->files[type];
633 sector_t blk = off >> sb->s_blocksize_bits;
634 int err = 0;
635 int offset = off & (sb->s_blocksize - 1);
636 int tocopy;
637 size_t toread;
638 struct buffer_head tmp_bh;
639 struct buffer_head *bh;
640 loff_t i_size = i_size_read(inode);
641
642 if (off > i_size)
643 return 0;
644 if (off+len > i_size)
645 len = i_size-off;
646 toread = len;
647 while (toread > 0) {
648 tocopy = sb->s_blocksize - offset < toread ?
649 sb->s_blocksize - offset : toread;
650
651 tmp_bh.b_state = 0;
652 tmp_bh.b_size = 1 << inode->i_blkbits;
653 err = jfs_get_block(inode, blk, &tmp_bh, 0);
654 if (err)
655 return err;
656 if (!buffer_mapped(&tmp_bh)) /* A hole? */
657 memset(data, 0, tocopy);
658 else {
659 bh = sb_bread(sb, tmp_bh.b_blocknr);
660 if (!bh)
661 return -EIO;
662 memcpy(data, bh->b_data+offset, tocopy);
663 brelse(bh);
664 }
665 offset = 0;
666 toread -= tocopy;
667 data += tocopy;
668 blk++;
669 }
670 return len;
671 }
672
673 /* Write to quotafile */
674 static ssize_t jfs_quota_write(struct super_block *sb, int type,
675 const char *data, size_t len, loff_t off)
676 {
677 struct inode *inode = sb_dqopt(sb)->files[type];
678 sector_t blk = off >> sb->s_blocksize_bits;
679 int err = 0;
680 int offset = off & (sb->s_blocksize - 1);
681 int tocopy;
682 size_t towrite = len;
683 struct buffer_head tmp_bh;
684 struct buffer_head *bh;
685
686 mutex_lock(&inode->i_mutex);
687 while (towrite > 0) {
688 tocopy = sb->s_blocksize - offset < towrite ?
689 sb->s_blocksize - offset : towrite;
690
691 tmp_bh.b_state = 0;
692 tmp_bh.b_size = 1 << inode->i_blkbits;
693 err = jfs_get_block(inode, blk, &tmp_bh, 1);
694 if (err)
695 goto out;
696 if (offset || tocopy != sb->s_blocksize)
697 bh = sb_bread(sb, tmp_bh.b_blocknr);
698 else
699 bh = sb_getblk(sb, tmp_bh.b_blocknr);
700 if (!bh) {
701 err = -EIO;
702 goto out;
703 }
704 lock_buffer(bh);
705 memcpy(bh->b_data+offset, data, tocopy);
706 flush_dcache_page(bh->b_page);
707 set_buffer_uptodate(bh);
708 mark_buffer_dirty(bh);
709 unlock_buffer(bh);
710 brelse(bh);
711 offset = 0;
712 towrite -= tocopy;
713 data += tocopy;
714 blk++;
715 }
716 out:
717 if (len == towrite)
718 return err;
719 if (inode->i_size < off+len-towrite)
720 i_size_write(inode, off+len-towrite);
721 inode->i_version++;
722 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
723 mark_inode_dirty(inode);
724 mutex_unlock(&inode->i_mutex);
725 return len - towrite;
726 }
727
728 #endif
729
730 static const struct super_operations jfs_super_operations = {
731 .alloc_inode = jfs_alloc_inode,
732 .destroy_inode = jfs_destroy_inode,
733 .dirty_inode = jfs_dirty_inode,
734 .write_inode = jfs_write_inode,
735 .delete_inode = jfs_delete_inode,
736 .put_super = jfs_put_super,
737 .sync_fs = jfs_sync_fs,
738 .write_super_lockfs = jfs_write_super_lockfs,
739 .unlockfs = jfs_unlockfs,
740 .statfs = jfs_statfs,
741 .remount_fs = jfs_remount,
742 .show_options = jfs_show_options,
743 #ifdef CONFIG_QUOTA
744 .quota_read = jfs_quota_read,
745 .quota_write = jfs_quota_write,
746 #endif
747 };
748
749 static const struct export_operations jfs_export_operations = {
750 .fh_to_dentry = jfs_fh_to_dentry,
751 .fh_to_parent = jfs_fh_to_parent,
752 .get_parent = jfs_get_parent,
753 };
754
755 static struct file_system_type jfs_fs_type = {
756 .owner = THIS_MODULE,
757 .name = "jfs",
758 .get_sb = jfs_get_sb,
759 .kill_sb = kill_block_super,
760 .fs_flags = FS_REQUIRES_DEV,
761 };
762
763 static void init_once(struct kmem_cache *cachep, void *foo)
764 {
765 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
766
767 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
768 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
769 init_rwsem(&jfs_ip->rdwrlock);
770 mutex_init(&jfs_ip->commit_mutex);
771 init_rwsem(&jfs_ip->xattr_sem);
772 spin_lock_init(&jfs_ip->ag_lock);
773 jfs_ip->active_ag = -1;
774 #ifdef CONFIG_JFS_POSIX_ACL
775 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
776 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
777 #endif
778 inode_init_once(&jfs_ip->vfs_inode);
779 }
780
781 static int __init init_jfs_fs(void)
782 {
783 int i;
784 int rc;
785
786 jfs_inode_cachep =
787 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
788 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
789 init_once);
790 if (jfs_inode_cachep == NULL)
791 return -ENOMEM;
792
793 /*
794 * Metapage initialization
795 */
796 rc = metapage_init();
797 if (rc) {
798 jfs_err("metapage_init failed w/rc = %d", rc);
799 goto free_slab;
800 }
801
802 /*
803 * Transaction Manager initialization
804 */
805 rc = txInit();
806 if (rc) {
807 jfs_err("txInit failed w/rc = %d", rc);
808 goto free_metapage;
809 }
810
811 /*
812 * I/O completion thread (endio)
813 */
814 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
815 if (IS_ERR(jfsIOthread)) {
816 rc = PTR_ERR(jfsIOthread);
817 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
818 goto end_txmngr;
819 }
820
821 if (commit_threads < 1)
822 commit_threads = num_online_cpus();
823 if (commit_threads > MAX_COMMIT_THREADS)
824 commit_threads = MAX_COMMIT_THREADS;
825
826 for (i = 0; i < commit_threads; i++) {
827 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
828 if (IS_ERR(jfsCommitThread[i])) {
829 rc = PTR_ERR(jfsCommitThread[i]);
830 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
831 commit_threads = i;
832 goto kill_committask;
833 }
834 }
835
836 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
837 if (IS_ERR(jfsSyncThread)) {
838 rc = PTR_ERR(jfsSyncThread);
839 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
840 goto kill_committask;
841 }
842
843 #ifdef PROC_FS_JFS
844 jfs_proc_init();
845 #endif
846
847 return register_filesystem(&jfs_fs_type);
848
849 kill_committask:
850 for (i = 0; i < commit_threads; i++)
851 kthread_stop(jfsCommitThread[i]);
852 kthread_stop(jfsIOthread);
853 end_txmngr:
854 txExit();
855 free_metapage:
856 metapage_exit();
857 free_slab:
858 kmem_cache_destroy(jfs_inode_cachep);
859 return rc;
860 }
861
862 static void __exit exit_jfs_fs(void)
863 {
864 int i;
865
866 jfs_info("exit_jfs_fs called");
867
868 txExit();
869 metapage_exit();
870
871 kthread_stop(jfsIOthread);
872 for (i = 0; i < commit_threads; i++)
873 kthread_stop(jfsCommitThread[i]);
874 kthread_stop(jfsSyncThread);
875 #ifdef PROC_FS_JFS
876 jfs_proc_clean();
877 #endif
878 unregister_filesystem(&jfs_fs_type);
879 kmem_cache_destroy(jfs_inode_cachep);
880 }
881
882 module_init(init_jfs_fs)
883 module_exit(exit_jfs_fs)
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