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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jfs / super.c
blob3eb13adf38623f444766ad085e0720c47284dd51
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
36 #include "jfs_incore.h"
37 #include "jfs_filsys.h"
38 #include "jfs_inode.h"
39 #include "jfs_metapage.h"
40 #include "jfs_superblock.h"
41 #include "jfs_dmap.h"
42 #include "jfs_imap.h"
43 #include "jfs_acl.h"
44 #include "jfs_debug.h"
45
46 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
47 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
48 MODULE_LICENSE("GPL");
49
50 static struct kmem_cache * jfs_inode_cachep;
51
52 static const struct super_operations jfs_super_operations;
53 static const struct export_operations jfs_export_operations;
54 static struct file_system_type jfs_fs_type;
55
56 #define MAX_COMMIT_THREADS 64
57 static int commit_threads = 0;
58 module_param(commit_threads, int, 0);
59 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
60
61 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
62 struct task_struct *jfsIOthread;
63 struct task_struct *jfsSyncThread;
64
65 #ifdef CONFIG_JFS_DEBUG
66 int jfsloglevel = JFS_LOGLEVEL_WARN;
67 module_param(jfsloglevel, int, 0644);
68 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
69 #endif
70
71 static void jfs_handle_error(struct super_block *sb)
72 {
73 struct jfs_sb_info *sbi = JFS_SBI(sb);
74
75 if (sb->s_flags & MS_RDONLY)
76 return;
77
78 updateSuper(sb, FM_DIRTY);
79
80 if (sbi->flag & JFS_ERR_PANIC)
81 panic("JFS (device %s): panic forced after error\n",
82 sb->s_id);
83 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
84 jfs_err("ERROR: (device %s): remounting filesystem "
85 "as read-only\n",
86 sb->s_id);
87 sb->s_flags |= MS_RDONLY;
88 }
89
90 /* nothing is done for continue beyond marking the superblock dirty */
91 }
92
93 void jfs_error(struct super_block *sb, const char * function, ...)
94 {
95 static char error_buf[256];
96 va_list args;
97
98 va_start(args, function);
99 vsnprintf(error_buf, sizeof(error_buf), function, args);
100 va_end(args);
101
102 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
103
104 jfs_handle_error(sb);
105 }
106
107 static struct inode *jfs_alloc_inode(struct super_block *sb)
108 {
109 struct jfs_inode_info *jfs_inode;
110
111 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
112 if (!jfs_inode)
113 return NULL;
114 return &jfs_inode->vfs_inode;
115 }
116
117 static void jfs_destroy_inode(struct inode *inode)
118 {
119 struct jfs_inode_info *ji = JFS_IP(inode);
120
121 BUG_ON(!list_empty(&ji->anon_inode_list));
122
123 spin_lock_irq(&ji->ag_lock);
124 if (ji->active_ag != -1) {
125 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
126 atomic_dec(&bmap->db_active[ji->active_ag]);
127 ji->active_ag = -1;
128 }
129 spin_unlock_irq(&ji->ag_lock);
130
131 #ifdef CONFIG_JFS_POSIX_ACL
132 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
133 posix_acl_release(ji->i_acl);
134 ji->i_acl = JFS_ACL_NOT_CACHED;
135 }
136 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
137 posix_acl_release(ji->i_default_acl);
138 ji->i_default_acl = JFS_ACL_NOT_CACHED;
139 }
140 #endif
141
142 kmem_cache_free(jfs_inode_cachep, ji);
143 }
144
145 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
146 {
147 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
148 s64 maxinodes;
149 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
150
151 jfs_info("In jfs_statfs");
152 buf->f_type = JFS_SUPER_MAGIC;
153 buf->f_bsize = sbi->bsize;
154 buf->f_blocks = sbi->bmap->db_mapsize;
155 buf->f_bfree = sbi->bmap->db_nfree;
156 buf->f_bavail = sbi->bmap->db_nfree;
157 /*
158 * If we really return the number of allocated & free inodes, some
159 * applications will fail because they won't see enough free inodes.
160 * We'll try to calculate some guess as to how may inodes we can
161 * really allocate
162 *
163 * buf->f_files = atomic_read(&imap->im_numinos);
164 * buf->f_ffree = atomic_read(&imap->im_numfree);
165 */
166 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
167 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
168 << L2INOSPEREXT), (s64) 0xffffffffLL);
169 buf->f_files = maxinodes;
170 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
171 atomic_read(&imap->im_numfree));
172 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
173 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
174 sizeof(sbi->uuid)/2);
175
176 buf->f_namelen = JFS_NAME_MAX;
177 return 0;
178 }
179
180 static void jfs_put_super(struct super_block *sb)
181 {
182 struct jfs_sb_info *sbi = JFS_SBI(sb);
183 int rc;
184
185 jfs_info("In jfs_put_super");
186
187 lock_kernel();
188
189 rc = jfs_umount(sb);
190 if (rc)
191 jfs_err("jfs_umount failed with return code %d", rc);
192 if (sbi->nls_tab)
193 unload_nls(sbi->nls_tab);
194 sbi->nls_tab = NULL;
195
196 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
197 iput(sbi->direct_inode);
198 sbi->direct_inode = NULL;
199
200 kfree(sbi);
201
202 unlock_kernel();
203 }
204
205 enum {
206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
209 };
210
211 static const match_table_t tokens = {
212 {Opt_integrity, "integrity"},
213 {Opt_nointegrity, "nointegrity"},
214 {Opt_iocharset, "iocharset=%s"},
215 {Opt_resize, "resize=%u"},
216 {Opt_resize_nosize, "resize"},
217 {Opt_errors, "errors=%s"},
218 {Opt_ignore, "noquota"},
219 {Opt_ignore, "quota"},
220 {Opt_usrquota, "usrquota"},
221 {Opt_grpquota, "grpquota"},
222 {Opt_uid, "uid=%u"},
223 {Opt_gid, "gid=%u"},
224 {Opt_umask, "umask=%u"},
225 {Opt_err, NULL}
226 };
227
228 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
229 int *flag)
230 {
231 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
232 char *p;
233 struct jfs_sb_info *sbi = JFS_SBI(sb);
234
235 *newLVSize = 0;
236
237 if (!options)
238 return 1;
239
240 while ((p = strsep(&options, ",")) != NULL) {
241 substring_t args[MAX_OPT_ARGS];
242 int token;
243 if (!*p)
244 continue;
245
246 token = match_token(p, tokens, args);
247 switch (token) {
248 case Opt_integrity:
249 *flag &= ~JFS_NOINTEGRITY;
250 break;
251 case Opt_nointegrity:
252 *flag |= JFS_NOINTEGRITY;
253 break;
254 case Opt_ignore:
255 /* Silently ignore the quota options */
256 /* Don't do anything ;-) */
257 break;
258 case Opt_iocharset:
259 if (nls_map && nls_map != (void *) -1)
260 unload_nls(nls_map);
261 if (!strcmp(args[0].from, "none"))
262 nls_map = NULL;
263 else {
264 nls_map = load_nls(args[0].from);
265 if (!nls_map) {
266 printk(KERN_ERR
267 "JFS: charset not found\n");
268 goto cleanup;
269 }
270 }
271 break;
272 case Opt_resize:
273 {
274 char *resize = args[0].from;
275 *newLVSize = simple_strtoull(resize, &resize, 0);
276 break;
277 }
278 case Opt_resize_nosize:
279 {
280 *newLVSize = sb->s_bdev->bd_inode->i_size >>
281 sb->s_blocksize_bits;
282 if (*newLVSize == 0)
283 printk(KERN_ERR
284 "JFS: Cannot determine volume size\n");
285 break;
286 }
287 case Opt_errors:
288 {
289 char *errors = args[0].from;
290 if (!errors || !*errors)
291 goto cleanup;
292 if (!strcmp(errors, "continue")) {
293 *flag &= ~JFS_ERR_REMOUNT_RO;
294 *flag &= ~JFS_ERR_PANIC;
295 *flag |= JFS_ERR_CONTINUE;
296 } else if (!strcmp(errors, "remount-ro")) {
297 *flag &= ~JFS_ERR_CONTINUE;
298 *flag &= ~JFS_ERR_PANIC;
299 *flag |= JFS_ERR_REMOUNT_RO;
300 } else if (!strcmp(errors, "panic")) {
301 *flag &= ~JFS_ERR_CONTINUE;
302 *flag &= ~JFS_ERR_REMOUNT_RO;
303 *flag |= JFS_ERR_PANIC;
304 } else {
305 printk(KERN_ERR
306 "JFS: %s is an invalid error handler\n",
307 errors);
308 goto cleanup;
309 }
310 break;
311 }
312
313 #ifdef CONFIG_QUOTA
314 case Opt_quota:
315 case Opt_usrquota:
316 *flag |= JFS_USRQUOTA;
317 break;
318 case Opt_grpquota:
319 *flag |= JFS_GRPQUOTA;
320 break;
321 #else
322 case Opt_usrquota:
323 case Opt_grpquota:
324 case Opt_quota:
325 printk(KERN_ERR
326 "JFS: quota operations not supported\n");
327 break;
328 #endif
329 case Opt_uid:
330 {
331 char *uid = args[0].from;
332 sbi->uid = simple_strtoul(uid, &uid, 0);
333 break;
334 }
335 case Opt_gid:
336 {
337 char *gid = args[0].from;
338 sbi->gid = simple_strtoul(gid, &gid, 0);
339 break;
340 }
341 case Opt_umask:
342 {
343 char *umask = args[0].from;
344 sbi->umask = simple_strtoul(umask, &umask, 8);
345 if (sbi->umask & ~0777) {
346 printk(KERN_ERR
347 "JFS: Invalid value of umask\n");
348 goto cleanup;
349 }
350 break;
351 }
352 default:
353 printk("jfs: Unrecognized mount option \"%s\" "
354 " or missing value\n", p);
355 goto cleanup;
356 }
357 }
358
359 if (nls_map != (void *) -1) {
360 /* Discard old (if remount) */
361 if (sbi->nls_tab)
362 unload_nls(sbi->nls_tab);
363 sbi->nls_tab = nls_map;
364 }
365 return 1;
366
367 cleanup:
368 if (nls_map && nls_map != (void *) -1)
369 unload_nls(nls_map);
370 return 0;
371 }
372
373 static int jfs_remount(struct super_block *sb, int *flags, char *data)
374 {
375 s64 newLVSize = 0;
376 int rc = 0;
377 int flag = JFS_SBI(sb)->flag;
378
379 if (!parse_options(data, sb, &newLVSize, &flag)) {
380 return -EINVAL;
381 }
382 if (newLVSize) {
383 if (sb->s_flags & MS_RDONLY) {
384 printk(KERN_ERR
385 "JFS: resize requires volume to be mounted read-write\n");
386 return -EROFS;
387 }
388 rc = jfs_extendfs(sb, newLVSize, 0);
389 if (rc)
390 return rc;
391 }
392
393 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
394 /*
395 * Invalidate any previously read metadata. fsck may have
396 * changed the on-disk data since we mounted r/o
397 */
398 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
399
400 JFS_SBI(sb)->flag = flag;
401 return jfs_mount_rw(sb, 1);
402 }
403 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
404 rc = jfs_umount_rw(sb);
405 JFS_SBI(sb)->flag = flag;
406 return rc;
407 }
408 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
409 if (!(sb->s_flags & MS_RDONLY)) {
410 rc = jfs_umount_rw(sb);
411 if (rc)
412 return rc;
413 JFS_SBI(sb)->flag = flag;
414 return jfs_mount_rw(sb, 1);
415 }
416 JFS_SBI(sb)->flag = flag;
417
418 return 0;
419 }
420
421 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
422 {
423 struct jfs_sb_info *sbi;
424 struct inode *inode;
425 int rc;
426 s64 newLVSize = 0;
427 int flag, ret = -EINVAL;
428
429 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
430
431 if (!new_valid_dev(sb->s_bdev->bd_dev))
432 return -EOVERFLOW;
433
434 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
435 if (!sbi)
436 return -ENOMEM;
437 sb->s_fs_info = sbi;
438 sbi->sb = sb;
439 sbi->uid = sbi->gid = sbi->umask = -1;
440
441 /* initialize the mount flag and determine the default error handler */
442 flag = JFS_ERR_REMOUNT_RO;
443
444 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
445 kfree(sbi);
446 return -EINVAL;
447 }
448 sbi->flag = flag;
449
450 #ifdef CONFIG_JFS_POSIX_ACL
451 sb->s_flags |= MS_POSIXACL;
452 #endif
453
454 if (newLVSize) {
455 printk(KERN_ERR "resize option for remount only\n");
456 return -EINVAL;
457 }
458
459 /*
460 * Initialize blocksize to 4K.
461 */
462 sb_set_blocksize(sb, PSIZE);
463
464 /*
465 * Set method vectors.
466 */
467 sb->s_op = &jfs_super_operations;
468 sb->s_export_op = &jfs_export_operations;
469
470 /*
471 * Initialize direct-mapping inode/address-space
472 */
473 inode = new_inode(sb);
474 if (inode == NULL) {
475 ret = -ENOMEM;
476 goto out_kfree;
477 }
478 inode->i_ino = 0;
479 inode->i_nlink = 1;
480 inode->i_size = sb->s_bdev->bd_inode->i_size;
481 inode->i_mapping->a_ops = &jfs_metapage_aops;
482 insert_inode_hash(inode);
483 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
484
485 sbi->direct_inode = inode;
486
487 rc = jfs_mount(sb);
488 if (rc) {
489 if (!silent) {
490 jfs_err("jfs_mount failed w/return code = %d", rc);
491 }
492 goto out_mount_failed;
493 }
494 if (sb->s_flags & MS_RDONLY)
495 sbi->log = NULL;
496 else {
497 rc = jfs_mount_rw(sb, 0);
498 if (rc) {
499 if (!silent) {
500 jfs_err("jfs_mount_rw failed, return code = %d",
501 rc);
502 }
503 goto out_no_rw;
504 }
505 }
506
507 sb->s_magic = JFS_SUPER_MAGIC;
508
509 inode = jfs_iget(sb, ROOT_I);
510 if (IS_ERR(inode)) {
511 ret = PTR_ERR(inode);
512 goto out_no_rw;
513 }
514 sb->s_root = d_alloc_root(inode);
515 if (!sb->s_root)
516 goto out_no_root;
517
518 if (sbi->mntflag & JFS_OS2)
519 sb->s_root->d_op = &jfs_ci_dentry_operations;
520
521 /* logical blocks are represented by 40 bits in pxd_t, etc. */
522 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
523 #if BITS_PER_LONG == 32
524 /*
525 * Page cache is indexed by long.
526 * I would use MAX_LFS_FILESIZE, but it's only half as big
527 */
528 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
529 #endif
530 sb->s_time_gran = 1;
531 return 0;
532
533 out_no_root:
534 jfs_err("jfs_read_super: get root dentry failed");
535 iput(inode);
536
537 out_no_rw:
538 rc = jfs_umount(sb);
539 if (rc) {
540 jfs_err("jfs_umount failed with return code %d", rc);
541 }
542 out_mount_failed:
543 filemap_write_and_wait(sbi->direct_inode->i_mapping);
544 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
545 make_bad_inode(sbi->direct_inode);
546 iput(sbi->direct_inode);
547 sbi->direct_inode = NULL;
548 out_kfree:
549 if (sbi->nls_tab)
550 unload_nls(sbi->nls_tab);
551 kfree(sbi);
552 return ret;
553 }
554
555 static int jfs_freeze(struct super_block *sb)
556 {
557 struct jfs_sb_info *sbi = JFS_SBI(sb);
558 struct jfs_log *log = sbi->log;
559
560 if (!(sb->s_flags & MS_RDONLY)) {
561 txQuiesce(sb);
562 lmLogShutdown(log);
563 updateSuper(sb, FM_CLEAN);
564 }
565 return 0;
566 }
567
568 static int jfs_unfreeze(struct super_block *sb)
569 {
570 struct jfs_sb_info *sbi = JFS_SBI(sb);
571 struct jfs_log *log = sbi->log;
572 int rc = 0;
573
574 if (!(sb->s_flags & MS_RDONLY)) {
575 updateSuper(sb, FM_MOUNT);
576 if ((rc = lmLogInit(log)))
577 jfs_err("jfs_unlock failed with return code %d", rc);
578 else
579 txResume(sb);
580 }
581 return 0;
582 }
583
584 static int jfs_get_sb(struct file_system_type *fs_type,
585 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
586 {
587 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
588 mnt);
589 }
590
591 static int jfs_sync_fs(struct super_block *sb, int wait)
592 {
593 struct jfs_log *log = JFS_SBI(sb)->log;
594
595 /* log == NULL indicates read-only mount */
596 if (log) {
597 jfs_flush_journal(log, wait);
598 jfs_syncpt(log, 0);
599 }
600
601 return 0;
602 }
603
604 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
605 {
606 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
607
608 if (sbi->uid != -1)
609 seq_printf(seq, ",uid=%d", sbi->uid);
610 if (sbi->gid != -1)
611 seq_printf(seq, ",gid=%d", sbi->gid);
612 if (sbi->umask != -1)
613 seq_printf(seq, ",umask=%03o", sbi->umask);
614 if (sbi->flag & JFS_NOINTEGRITY)
615 seq_puts(seq, ",nointegrity");
616 if (sbi->nls_tab)
617 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
618 if (sbi->flag & JFS_ERR_CONTINUE)
619 seq_printf(seq, ",errors=continue");
620 if (sbi->flag & JFS_ERR_PANIC)
621 seq_printf(seq, ",errors=panic");
622
623 #ifdef CONFIG_QUOTA
624 if (sbi->flag & JFS_USRQUOTA)
625 seq_puts(seq, ",usrquota");
626
627 if (sbi->flag & JFS_GRPQUOTA)
628 seq_puts(seq, ",grpquota");
629 #endif
630
631 return 0;
632 }
633
634 #ifdef CONFIG_QUOTA
635
636 /* Read data from quotafile - avoid pagecache and such because we cannot afford
637 * acquiring the locks... As quota files are never truncated and quota code
638 * itself serializes the operations (and noone else should touch the files)
639 * we don't have to be afraid of races */
640 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
641 size_t len, loff_t off)
642 {
643 struct inode *inode = sb_dqopt(sb)->files[type];
644 sector_t blk = off >> sb->s_blocksize_bits;
645 int err = 0;
646 int offset = off & (sb->s_blocksize - 1);
647 int tocopy;
648 size_t toread;
649 struct buffer_head tmp_bh;
650 struct buffer_head *bh;
651 loff_t i_size = i_size_read(inode);
652
653 if (off > i_size)
654 return 0;
655 if (off+len > i_size)
656 len = i_size-off;
657 toread = len;
658 while (toread > 0) {
659 tocopy = sb->s_blocksize - offset < toread ?
660 sb->s_blocksize - offset : toread;
661
662 tmp_bh.b_state = 0;
663 tmp_bh.b_size = 1 << inode->i_blkbits;
664 err = jfs_get_block(inode, blk, &tmp_bh, 0);
665 if (err)
666 return err;
667 if (!buffer_mapped(&tmp_bh)) /* A hole? */
668 memset(data, 0, tocopy);
669 else {
670 bh = sb_bread(sb, tmp_bh.b_blocknr);
671 if (!bh)
672 return -EIO;
673 memcpy(data, bh->b_data+offset, tocopy);
674 brelse(bh);
675 }
676 offset = 0;
677 toread -= tocopy;
678 data += tocopy;
679 blk++;
680 }
681 return len;
682 }
683
684 /* Write to quotafile */
685 static ssize_t jfs_quota_write(struct super_block *sb, int type,
686 const char *data, size_t len, loff_t off)
687 {
688 struct inode *inode = sb_dqopt(sb)->files[type];
689 sector_t blk = off >> sb->s_blocksize_bits;
690 int err = 0;
691 int offset = off & (sb->s_blocksize - 1);
692 int tocopy;
693 size_t towrite = len;
694 struct buffer_head tmp_bh;
695 struct buffer_head *bh;
696
697 mutex_lock(&inode->i_mutex);
698 while (towrite > 0) {
699 tocopy = sb->s_blocksize - offset < towrite ?
700 sb->s_blocksize - offset : towrite;
701
702 tmp_bh.b_state = 0;
703 tmp_bh.b_size = 1 << inode->i_blkbits;
704 err = jfs_get_block(inode, blk, &tmp_bh, 1);
705 if (err)
706 goto out;
707 if (offset || tocopy != sb->s_blocksize)
708 bh = sb_bread(sb, tmp_bh.b_blocknr);
709 else
710 bh = sb_getblk(sb, tmp_bh.b_blocknr);
711 if (!bh) {
712 err = -EIO;
713 goto out;
714 }
715 lock_buffer(bh);
716 memcpy(bh->b_data+offset, data, tocopy);
717 flush_dcache_page(bh->b_page);
718 set_buffer_uptodate(bh);
719 mark_buffer_dirty(bh);
720 unlock_buffer(bh);
721 brelse(bh);
722 offset = 0;
723 towrite -= tocopy;
724 data += tocopy;
725 blk++;
726 }
727 out:
728 if (len == towrite) {
729 mutex_unlock(&inode->i_mutex);
730 return err;
731 }
732 if (inode->i_size < off+len-towrite)
733 i_size_write(inode, off+len-towrite);
734 inode->i_version++;
735 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
736 mark_inode_dirty(inode);
737 mutex_unlock(&inode->i_mutex);
738 return len - towrite;
739 }
740
741 #endif
742
743 static const struct super_operations jfs_super_operations = {
744 .alloc_inode = jfs_alloc_inode,
745 .destroy_inode = jfs_destroy_inode,
746 .dirty_inode = jfs_dirty_inode,
747 .write_inode = jfs_write_inode,
748 .delete_inode = jfs_delete_inode,
749 .put_super = jfs_put_super,
750 .sync_fs = jfs_sync_fs,
751 .freeze_fs = jfs_freeze,
752 .unfreeze_fs = jfs_unfreeze,
753 .statfs = jfs_statfs,
754 .remount_fs = jfs_remount,
755 .show_options = jfs_show_options,
756 #ifdef CONFIG_QUOTA
757 .quota_read = jfs_quota_read,
758 .quota_write = jfs_quota_write,
759 #endif
760 };
761
762 static const struct export_operations jfs_export_operations = {
763 .fh_to_dentry = jfs_fh_to_dentry,
764 .fh_to_parent = jfs_fh_to_parent,
765 .get_parent = jfs_get_parent,
766 };
767
768 static struct file_system_type jfs_fs_type = {
769 .owner = THIS_MODULE,
770 .name = "jfs",
771 .get_sb = jfs_get_sb,
772 .kill_sb = kill_block_super,
773 .fs_flags = FS_REQUIRES_DEV,
774 };
775
776 static void init_once(void *foo)
777 {
778 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
779
780 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
781 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
782 init_rwsem(&jfs_ip->rdwrlock);
783 mutex_init(&jfs_ip->commit_mutex);
784 init_rwsem(&jfs_ip->xattr_sem);
785 spin_lock_init(&jfs_ip->ag_lock);
786 jfs_ip->active_ag = -1;
787 #ifdef CONFIG_JFS_POSIX_ACL
788 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
789 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
790 #endif
791 inode_init_once(&jfs_ip->vfs_inode);
792 }
793
794 static int __init init_jfs_fs(void)
795 {
796 int i;
797 int rc;
798
799 jfs_inode_cachep =
800 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
801 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
802 init_once);
803 if (jfs_inode_cachep == NULL)
804 return -ENOMEM;
805
806 /*
807 * Metapage initialization
808 */
809 rc = metapage_init();
810 if (rc) {
811 jfs_err("metapage_init failed w/rc = %d", rc);
812 goto free_slab;
813 }
814
815 /*
816 * Transaction Manager initialization
817 */
818 rc = txInit();
819 if (rc) {
820 jfs_err("txInit failed w/rc = %d", rc);
821 goto free_metapage;
822 }
823
824 /*
825 * I/O completion thread (endio)
826 */
827 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
828 if (IS_ERR(jfsIOthread)) {
829 rc = PTR_ERR(jfsIOthread);
830 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
831 goto end_txmngr;
832 }
833
834 if (commit_threads < 1)
835 commit_threads = num_online_cpus();
836 if (commit_threads > MAX_COMMIT_THREADS)
837 commit_threads = MAX_COMMIT_THREADS;
838
839 for (i = 0; i < commit_threads; i++) {
840 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
841 if (IS_ERR(jfsCommitThread[i])) {
842 rc = PTR_ERR(jfsCommitThread[i]);
843 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
844 commit_threads = i;
845 goto kill_committask;
846 }
847 }
848
849 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
850 if (IS_ERR(jfsSyncThread)) {
851 rc = PTR_ERR(jfsSyncThread);
852 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
853 goto kill_committask;
854 }
855
856 #ifdef PROC_FS_JFS
857 jfs_proc_init();
858 #endif
859
860 return register_filesystem(&jfs_fs_type);
861
862 kill_committask:
863 for (i = 0; i < commit_threads; i++)
864 kthread_stop(jfsCommitThread[i]);
865 kthread_stop(jfsIOthread);
866 end_txmngr:
867 txExit();
868 free_metapage:
869 metapage_exit();
870 free_slab:
871 kmem_cache_destroy(jfs_inode_cachep);
872 return rc;
873 }
874
875 static void __exit exit_jfs_fs(void)
876 {
877 int i;
878
879 jfs_info("exit_jfs_fs called");
880
881 txExit();
882 metapage_exit();
883
884 kthread_stop(jfsIOthread);
885 for (i = 0; i < commit_threads; i++)
886 kthread_stop(jfsCommitThread[i]);
887 kthread_stop(jfsSyncThread);
888 #ifdef PROC_FS_JFS
889 jfs_proc_clean();
890 #endif
891 unregister_filesystem(&jfs_fs_type);
892 kmem_cache_destroy(jfs_inode_cachep);
893 }
894
895 module_init(init_jfs_fs)
896 module_exit(exit_jfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree