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kvm tools, setup: Create private directory
[linux-2.6/next.git] / fs / jfs / super.c
blob06c8a67cbe762ed29a801f79d2ed40c2ccd59c12
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_i_callback(struct rcu_head *head)
119 {
120 struct inode *inode = container_of(head, struct inode, i_rcu);
121 struct jfs_inode_info *ji = JFS_IP(inode);
122 INIT_LIST_HEAD(&inode->i_dentry);
123 kmem_cache_free(jfs_inode_cachep, ji);
124 }
125
126 static void jfs_destroy_inode(struct inode *inode)
127 {
128 struct jfs_inode_info *ji = JFS_IP(inode);
129
130 BUG_ON(!list_empty(&ji->anon_inode_list));
131
132 spin_lock_irq(&ji->ag_lock);
133 if (ji->active_ag != -1) {
134 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
135 atomic_dec(&bmap->db_active[ji->active_ag]);
136 ji->active_ag = -1;
137 }
138 spin_unlock_irq(&ji->ag_lock);
139 call_rcu(&inode->i_rcu, jfs_i_callback);
140 }
141
142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
143 {
144 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
145 s64 maxinodes;
146 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
147
148 jfs_info("In jfs_statfs");
149 buf->f_type = JFS_SUPER_MAGIC;
150 buf->f_bsize = sbi->bsize;
151 buf->f_blocks = sbi->bmap->db_mapsize;
152 buf->f_bfree = sbi->bmap->db_nfree;
153 buf->f_bavail = sbi->bmap->db_nfree;
154 /*
155 * If we really return the number of allocated & free inodes, some
156 * applications will fail because they won't see enough free inodes.
157 * We'll try to calculate some guess as to how may inodes we can
158 * really allocate
159 *
160 * buf->f_files = atomic_read(&imap->im_numinos);
161 * buf->f_ffree = atomic_read(&imap->im_numfree);
162 */
163 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
164 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
165 << L2INOSPEREXT), (s64) 0xffffffffLL);
166 buf->f_files = maxinodes;
167 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
168 atomic_read(&imap->im_numfree));
169 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
170 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
171 sizeof(sbi->uuid)/2);
172
173 buf->f_namelen = JFS_NAME_MAX;
174 return 0;
175 }
176
177 static void jfs_put_super(struct super_block *sb)
178 {
179 struct jfs_sb_info *sbi = JFS_SBI(sb);
180 int rc;
181
182 jfs_info("In jfs_put_super");
183
184 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
185
186 rc = jfs_umount(sb);
187 if (rc)
188 jfs_err("jfs_umount failed with return code %d", rc);
189
190 unload_nls(sbi->nls_tab);
191
192 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
193 iput(sbi->direct_inode);
194
195 kfree(sbi);
196 }
197
198 enum {
199 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
200 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
201 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
202 };
203
204 static const match_table_t tokens = {
205 {Opt_integrity, "integrity"},
206 {Opt_nointegrity, "nointegrity"},
207 {Opt_iocharset, "iocharset=%s"},
208 {Opt_resize, "resize=%u"},
209 {Opt_resize_nosize, "resize"},
210 {Opt_errors, "errors=%s"},
211 {Opt_ignore, "noquota"},
212 {Opt_ignore, "quota"},
213 {Opt_usrquota, "usrquota"},
214 {Opt_grpquota, "grpquota"},
215 {Opt_uid, "uid=%u"},
216 {Opt_gid, "gid=%u"},
217 {Opt_umask, "umask=%u"},
218 {Opt_err, NULL}
219 };
220
221 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
222 int *flag)
223 {
224 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
225 char *p;
226 struct jfs_sb_info *sbi = JFS_SBI(sb);
227
228 *newLVSize = 0;
229
230 if (!options)
231 return 1;
232
233 while ((p = strsep(&options, ",")) != NULL) {
234 substring_t args[MAX_OPT_ARGS];
235 int token;
236 if (!*p)
237 continue;
238
239 token = match_token(p, tokens, args);
240 switch (token) {
241 case Opt_integrity:
242 *flag &= ~JFS_NOINTEGRITY;
243 break;
244 case Opt_nointegrity:
245 *flag |= JFS_NOINTEGRITY;
246 break;
247 case Opt_ignore:
248 /* Silently ignore the quota options */
249 /* Don't do anything ;-) */
250 break;
251 case Opt_iocharset:
252 if (nls_map && nls_map != (void *) -1)
253 unload_nls(nls_map);
254 if (!strcmp(args[0].from, "none"))
255 nls_map = NULL;
256 else {
257 nls_map = load_nls(args[0].from);
258 if (!nls_map) {
259 printk(KERN_ERR
260 "JFS: charset not found\n");
261 goto cleanup;
262 }
263 }
264 break;
265 case Opt_resize:
266 {
267 char *resize = args[0].from;
268 *newLVSize = simple_strtoull(resize, &resize, 0);
269 break;
270 }
271 case Opt_resize_nosize:
272 {
273 *newLVSize = sb->s_bdev->bd_inode->i_size >>
274 sb->s_blocksize_bits;
275 if (*newLVSize == 0)
276 printk(KERN_ERR
277 "JFS: Cannot determine volume size\n");
278 break;
279 }
280 case Opt_errors:
281 {
282 char *errors = args[0].from;
283 if (!errors || !*errors)
284 goto cleanup;
285 if (!strcmp(errors, "continue")) {
286 *flag &= ~JFS_ERR_REMOUNT_RO;
287 *flag &= ~JFS_ERR_PANIC;
288 *flag |= JFS_ERR_CONTINUE;
289 } else if (!strcmp(errors, "remount-ro")) {
290 *flag &= ~JFS_ERR_CONTINUE;
291 *flag &= ~JFS_ERR_PANIC;
292 *flag |= JFS_ERR_REMOUNT_RO;
293 } else if (!strcmp(errors, "panic")) {
294 *flag &= ~JFS_ERR_CONTINUE;
295 *flag &= ~JFS_ERR_REMOUNT_RO;
296 *flag |= JFS_ERR_PANIC;
297 } else {
298 printk(KERN_ERR
299 "JFS: %s is an invalid error handler\n",
300 errors);
301 goto cleanup;
302 }
303 break;
304 }
305
306 #ifdef CONFIG_QUOTA
307 case Opt_quota:
308 case Opt_usrquota:
309 *flag |= JFS_USRQUOTA;
310 break;
311 case Opt_grpquota:
312 *flag |= JFS_GRPQUOTA;
313 break;
314 #else
315 case Opt_usrquota:
316 case Opt_grpquota:
317 case Opt_quota:
318 printk(KERN_ERR
319 "JFS: quota operations not supported\n");
320 break;
321 #endif
322 case Opt_uid:
323 {
324 char *uid = args[0].from;
325 sbi->uid = simple_strtoul(uid, &uid, 0);
326 break;
327 }
328 case Opt_gid:
329 {
330 char *gid = args[0].from;
331 sbi->gid = simple_strtoul(gid, &gid, 0);
332 break;
333 }
334 case Opt_umask:
335 {
336 char *umask = args[0].from;
337 sbi->umask = simple_strtoul(umask, &umask, 8);
338 if (sbi->umask & ~0777) {
339 printk(KERN_ERR
340 "JFS: Invalid value of umask\n");
341 goto cleanup;
342 }
343 break;
344 }
345 default:
346 printk("jfs: Unrecognized mount option \"%s\" "
347 " or missing value\n", p);
348 goto cleanup;
349 }
350 }
351
352 if (nls_map != (void *) -1) {
353 /* Discard old (if remount) */
354 unload_nls(sbi->nls_tab);
355 sbi->nls_tab = nls_map;
356 }
357 return 1;
358
359 cleanup:
360 if (nls_map && nls_map != (void *) -1)
361 unload_nls(nls_map);
362 return 0;
363 }
364
365 static int jfs_remount(struct super_block *sb, int *flags, char *data)
366 {
367 s64 newLVSize = 0;
368 int rc = 0;
369 int flag = JFS_SBI(sb)->flag;
370 int ret;
371
372 if (!parse_options(data, sb, &newLVSize, &flag)) {
373 return -EINVAL;
374 }
375
376 if (newLVSize) {
377 if (sb->s_flags & MS_RDONLY) {
378 printk(KERN_ERR
379 "JFS: resize requires volume to be mounted read-write\n");
380 return -EROFS;
381 }
382 rc = jfs_extendfs(sb, newLVSize, 0);
383 if (rc)
384 return rc;
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
397 /* mark the fs r/w for quota activity */
398 sb->s_flags &= ~MS_RDONLY;
399
400 dquot_resume(sb, -1);
401 return ret;
402 }
403 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
404 rc = dquot_suspend(sb, -1);
405 if (rc < 0) {
406 return rc;
407 }
408 rc = jfs_umount_rw(sb);
409 JFS_SBI(sb)->flag = flag;
410 return rc;
411 }
412 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
413 if (!(sb->s_flags & MS_RDONLY)) {
414 rc = jfs_umount_rw(sb);
415 if (rc)
416 return rc;
417
418 JFS_SBI(sb)->flag = flag;
419 ret = jfs_mount_rw(sb, 1);
420 return ret;
421 }
422 JFS_SBI(sb)->flag = flag;
423
424 return 0;
425 }
426
427 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
428 {
429 struct jfs_sb_info *sbi;
430 struct inode *inode;
431 int rc;
432 s64 newLVSize = 0;
433 int flag, ret = -EINVAL;
434
435 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
436
437 if (!new_valid_dev(sb->s_bdev->bd_dev))
438 return -EOVERFLOW;
439
440 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
441 if (!sbi)
442 return -ENOMEM;
443
444 sb->s_fs_info = sbi;
445 sbi->sb = sb;
446 sbi->uid = sbi->gid = sbi->umask = -1;
447
448 /* initialize the mount flag and determine the default error handler */
449 flag = JFS_ERR_REMOUNT_RO;
450
451 if (!parse_options((char *) data, sb, &newLVSize, &flag))
452 goto out_kfree;
453 sbi->flag = flag;
454
455 #ifdef CONFIG_JFS_POSIX_ACL
456 sb->s_flags |= MS_POSIXACL;
457 #endif
458
459 if (newLVSize) {
460 printk(KERN_ERR "resize option for remount only\n");
461 goto out_kfree;
462 }
463
464 /*
465 * Initialize blocksize to 4K.
466 */
467 sb_set_blocksize(sb, PSIZE);
468
469 /*
470 * Set method vectors.
471 */
472 sb->s_op = &jfs_super_operations;
473 sb->s_export_op = &jfs_export_operations;
474 #ifdef CONFIG_QUOTA
475 sb->dq_op = &dquot_operations;
476 sb->s_qcop = &dquot_quotactl_ops;
477 #endif
478
479 /*
480 * Initialize direct-mapping inode/address-space
481 */
482 inode = new_inode(sb);
483 if (inode == NULL) {
484 ret = -ENOMEM;
485 goto out_unload;
486 }
487 inode->i_ino = 0;
488 inode->i_nlink = 1;
489 inode->i_size = sb->s_bdev->bd_inode->i_size;
490 inode->i_mapping->a_ops = &jfs_metapage_aops;
491 insert_inode_hash(inode);
492 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
493
494 sbi->direct_inode = inode;
495
496 rc = jfs_mount(sb);
497 if (rc) {
498 if (!silent) {
499 jfs_err("jfs_mount failed w/return code = %d", rc);
500 }
501 goto out_mount_failed;
502 }
503 if (sb->s_flags & MS_RDONLY)
504 sbi->log = NULL;
505 else {
506 rc = jfs_mount_rw(sb, 0);
507 if (rc) {
508 if (!silent) {
509 jfs_err("jfs_mount_rw failed, return code = %d",
510 rc);
511 }
512 goto out_no_rw;
513 }
514 }
515
516 sb->s_magic = JFS_SUPER_MAGIC;
517
518 if (sbi->mntflag & JFS_OS2)
519 sb->s_d_op = &jfs_ci_dentry_operations;
520
521 inode = jfs_iget(sb, ROOT_I);
522 if (IS_ERR(inode)) {
523 ret = PTR_ERR(inode);
524 goto out_no_rw;
525 }
526 sb->s_root = d_alloc_root(inode);
527 if (!sb->s_root)
528 goto out_no_root;
529
530 /* logical blocks are represented by 40 bits in pxd_t, etc. */
531 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
532 #if BITS_PER_LONG == 32
533 /*
534 * Page cache is indexed by long.
535 * I would use MAX_LFS_FILESIZE, but it's only half as big
536 */
537 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
538 #endif
539 sb->s_time_gran = 1;
540 return 0;
541
542 out_no_root:
543 jfs_err("jfs_read_super: get root dentry failed");
544 iput(inode);
545
546 out_no_rw:
547 rc = jfs_umount(sb);
548 if (rc) {
549 jfs_err("jfs_umount failed with return code %d", rc);
550 }
551 out_mount_failed:
552 filemap_write_and_wait(sbi->direct_inode->i_mapping);
553 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
554 make_bad_inode(sbi->direct_inode);
555 iput(sbi->direct_inode);
556 sbi->direct_inode = NULL;
557 out_unload:
558 if (sbi->nls_tab)
559 unload_nls(sbi->nls_tab);
560 out_kfree:
561 kfree(sbi);
562 return ret;
563 }
564
565 static int jfs_freeze(struct super_block *sb)
566 {
567 struct jfs_sb_info *sbi = JFS_SBI(sb);
568 struct jfs_log *log = sbi->log;
569
570 if (!(sb->s_flags & MS_RDONLY)) {
571 txQuiesce(sb);
572 lmLogShutdown(log);
573 updateSuper(sb, FM_CLEAN);
574 }
575 return 0;
576 }
577
578 static int jfs_unfreeze(struct super_block *sb)
579 {
580 struct jfs_sb_info *sbi = JFS_SBI(sb);
581 struct jfs_log *log = sbi->log;
582 int rc = 0;
583
584 if (!(sb->s_flags & MS_RDONLY)) {
585 updateSuper(sb, FM_MOUNT);
586 if ((rc = lmLogInit(log)))
587 jfs_err("jfs_unlock failed with return code %d", rc);
588 else
589 txResume(sb);
590 }
591 return 0;
592 }
593
594 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
595 int flags, const char *dev_name, void *data)
596 {
597 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
598 }
599
600 static int jfs_sync_fs(struct super_block *sb, int wait)
601 {
602 struct jfs_log *log = JFS_SBI(sb)->log;
603
604 /* log == NULL indicates read-only mount */
605 if (log) {
606 jfs_flush_journal(log, wait);
607 jfs_syncpt(log, 0);
608 }
609
610 return 0;
611 }
612
613 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
614 {
615 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
616
617 if (sbi->uid != -1)
618 seq_printf(seq, ",uid=%d", sbi->uid);
619 if (sbi->gid != -1)
620 seq_printf(seq, ",gid=%d", sbi->gid);
621 if (sbi->umask != -1)
622 seq_printf(seq, ",umask=%03o", sbi->umask);
623 if (sbi->flag & JFS_NOINTEGRITY)
624 seq_puts(seq, ",nointegrity");
625 if (sbi->nls_tab)
626 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
627 if (sbi->flag & JFS_ERR_CONTINUE)
628 seq_printf(seq, ",errors=continue");
629 if (sbi->flag & JFS_ERR_PANIC)
630 seq_printf(seq, ",errors=panic");
631
632 #ifdef CONFIG_QUOTA
633 if (sbi->flag & JFS_USRQUOTA)
634 seq_puts(seq, ",usrquota");
635
636 if (sbi->flag & JFS_GRPQUOTA)
637 seq_puts(seq, ",grpquota");
638 #endif
639
640 return 0;
641 }
642
643 #ifdef CONFIG_QUOTA
644
645 /* Read data from quotafile - avoid pagecache and such because we cannot afford
646 * acquiring the locks... As quota files are never truncated and quota code
647 * itself serializes the operations (and no one else should touch the files)
648 * we don't have to be afraid of races */
649 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
650 size_t len, loff_t off)
651 {
652 struct inode *inode = sb_dqopt(sb)->files[type];
653 sector_t blk = off >> sb->s_blocksize_bits;
654 int err = 0;
655 int offset = off & (sb->s_blocksize - 1);
656 int tocopy;
657 size_t toread;
658 struct buffer_head tmp_bh;
659 struct buffer_head *bh;
660 loff_t i_size = i_size_read(inode);
661
662 if (off > i_size)
663 return 0;
664 if (off+len > i_size)
665 len = i_size-off;
666 toread = len;
667 while (toread > 0) {
668 tocopy = sb->s_blocksize - offset < toread ?
669 sb->s_blocksize - offset : toread;
670
671 tmp_bh.b_state = 0;
672 tmp_bh.b_size = 1 << inode->i_blkbits;
673 err = jfs_get_block(inode, blk, &tmp_bh, 0);
674 if (err)
675 return err;
676 if (!buffer_mapped(&tmp_bh)) /* A hole? */
677 memset(data, 0, tocopy);
678 else {
679 bh = sb_bread(sb, tmp_bh.b_blocknr);
680 if (!bh)
681 return -EIO;
682 memcpy(data, bh->b_data+offset, tocopy);
683 brelse(bh);
684 }
685 offset = 0;
686 toread -= tocopy;
687 data += tocopy;
688 blk++;
689 }
690 return len;
691 }
692
693 /* Write to quotafile */
694 static ssize_t jfs_quota_write(struct super_block *sb, int type,
695 const char *data, size_t len, loff_t off)
696 {
697 struct inode *inode = sb_dqopt(sb)->files[type];
698 sector_t blk = off >> sb->s_blocksize_bits;
699 int err = 0;
700 int offset = off & (sb->s_blocksize - 1);
701 int tocopy;
702 size_t towrite = len;
703 struct buffer_head tmp_bh;
704 struct buffer_head *bh;
705
706 mutex_lock(&inode->i_mutex);
707 while (towrite > 0) {
708 tocopy = sb->s_blocksize - offset < towrite ?
709 sb->s_blocksize - offset : towrite;
710
711 tmp_bh.b_state = 0;
712 tmp_bh.b_size = 1 << inode->i_blkbits;
713 err = jfs_get_block(inode, blk, &tmp_bh, 1);
714 if (err)
715 goto out;
716 if (offset || tocopy != sb->s_blocksize)
717 bh = sb_bread(sb, tmp_bh.b_blocknr);
718 else
719 bh = sb_getblk(sb, tmp_bh.b_blocknr);
720 if (!bh) {
721 err = -EIO;
722 goto out;
723 }
724 lock_buffer(bh);
725 memcpy(bh->b_data+offset, data, tocopy);
726 flush_dcache_page(bh->b_page);
727 set_buffer_uptodate(bh);
728 mark_buffer_dirty(bh);
729 unlock_buffer(bh);
730 brelse(bh);
731 offset = 0;
732 towrite -= tocopy;
733 data += tocopy;
734 blk++;
735 }
736 out:
737 if (len == towrite) {
738 mutex_unlock(&inode->i_mutex);
739 return err;
740 }
741 if (inode->i_size < off+len-towrite)
742 i_size_write(inode, off+len-towrite);
743 inode->i_version++;
744 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
745 mark_inode_dirty(inode);
746 mutex_unlock(&inode->i_mutex);
747 return len - towrite;
748 }
749
750 #endif
751
752 static const struct super_operations jfs_super_operations = {
753 .alloc_inode = jfs_alloc_inode,
754 .destroy_inode = jfs_destroy_inode,
755 .dirty_inode = jfs_dirty_inode,
756 .write_inode = jfs_write_inode,
757 .evict_inode = jfs_evict_inode,
758 .put_super = jfs_put_super,
759 .sync_fs = jfs_sync_fs,
760 .freeze_fs = jfs_freeze,
761 .unfreeze_fs = jfs_unfreeze,
762 .statfs = jfs_statfs,
763 .remount_fs = jfs_remount,
764 .show_options = jfs_show_options,
765 #ifdef CONFIG_QUOTA
766 .quota_read = jfs_quota_read,
767 .quota_write = jfs_quota_write,
768 #endif
769 };
770
771 static const struct export_operations jfs_export_operations = {
772 .fh_to_dentry = jfs_fh_to_dentry,
773 .fh_to_parent = jfs_fh_to_parent,
774 .get_parent = jfs_get_parent,
775 };
776
777 static struct file_system_type jfs_fs_type = {
778 .owner = THIS_MODULE,
779 .name = "jfs",
780 .mount = jfs_do_mount,
781 .kill_sb = kill_block_super,
782 .fs_flags = FS_REQUIRES_DEV,
783 };
784
785 static void init_once(void *foo)
786 {
787 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
788
789 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
790 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
791 init_rwsem(&jfs_ip->rdwrlock);
792 mutex_init(&jfs_ip->commit_mutex);
793 init_rwsem(&jfs_ip->xattr_sem);
794 spin_lock_init(&jfs_ip->ag_lock);
795 jfs_ip->active_ag = -1;
796 inode_init_once(&jfs_ip->vfs_inode);
797 }
798
799 static int __init init_jfs_fs(void)
800 {
801 int i;
802 int rc;
803
804 jfs_inode_cachep =
805 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
806 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
807 init_once);
808 if (jfs_inode_cachep == NULL)
809 return -ENOMEM;
810
811 /*
812 * Metapage initialization
813 */
814 rc = metapage_init();
815 if (rc) {
816 jfs_err("metapage_init failed w/rc = %d", rc);
817 goto free_slab;
818 }
819
820 /*
821 * Transaction Manager initialization
822 */
823 rc = txInit();
824 if (rc) {
825 jfs_err("txInit failed w/rc = %d", rc);
826 goto free_metapage;
827 }
828
829 /*
830 * I/O completion thread (endio)
831 */
832 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
833 if (IS_ERR(jfsIOthread)) {
834 rc = PTR_ERR(jfsIOthread);
835 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
836 goto end_txmngr;
837 }
838
839 if (commit_threads < 1)
840 commit_threads = num_online_cpus();
841 if (commit_threads > MAX_COMMIT_THREADS)
842 commit_threads = MAX_COMMIT_THREADS;
843
844 for (i = 0; i < commit_threads; i++) {
845 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
846 if (IS_ERR(jfsCommitThread[i])) {
847 rc = PTR_ERR(jfsCommitThread[i]);
848 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
849 commit_threads = i;
850 goto kill_committask;
851 }
852 }
853
854 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
855 if (IS_ERR(jfsSyncThread)) {
856 rc = PTR_ERR(jfsSyncThread);
857 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
858 goto kill_committask;
859 }
860
861 #ifdef PROC_FS_JFS
862 jfs_proc_init();
863 #endif
864
865 return register_filesystem(&jfs_fs_type);
866
867 kill_committask:
868 for (i = 0; i < commit_threads; i++)
869 kthread_stop(jfsCommitThread[i]);
870 kthread_stop(jfsIOthread);
871 end_txmngr:
872 txExit();
873 free_metapage:
874 metapage_exit();
875 free_slab:
876 kmem_cache_destroy(jfs_inode_cachep);
877 return rc;
878 }
879
880 static void __exit exit_jfs_fs(void)
881 {
882 int i;
883
884 jfs_info("exit_jfs_fs called");
885
886 txExit();
887 metapage_exit();
888
889 kthread_stop(jfsIOthread);
890 for (i = 0; i < commit_threads; i++)
891 kthread_stop(jfsCommitThread[i]);
892 kthread_stop(jfsSyncThread);
893 #ifdef PROC_FS_JFS
894 jfs_proc_clean();
895 #endif
896 unregister_filesystem(&jfs_fs_type);
897 kmem_cache_destroy(jfs_inode_cachep);
898 }
899
900 module_init(init_jfs_fs)
901 module_exit(exit_jfs_fs)
linux-next