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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / jfs / super.c
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 #include <linux/smp_lock.h>
37
38 #include "jfs_incore.h"
39 #include "jfs_filsys.h"
40 #include "jfs_inode.h"
41 #include "jfs_metapage.h"
42 #include "jfs_superblock.h"
43 #include "jfs_dmap.h"
44 #include "jfs_imap.h"
45 #include "jfs_acl.h"
46 #include "jfs_debug.h"
47
48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
50 MODULE_LICENSE("GPL");
51
52 static struct kmem_cache * jfs_inode_cachep;
53
54 static const struct super_operations jfs_super_operations;
55 static const struct export_operations jfs_export_operations;
56 static struct file_system_type jfs_fs_type;
57
58 #define MAX_COMMIT_THREADS 64
59 static int commit_threads = 0;
60 module_param(commit_threads, int, 0);
61 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
62
63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
64 struct task_struct *jfsIOthread;
65 struct task_struct *jfsSyncThread;
66
67 #ifdef CONFIG_JFS_DEBUG
68 int jfsloglevel = JFS_LOGLEVEL_WARN;
69 module_param(jfsloglevel, int, 0644);
70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
71 #endif
72
73 static void jfs_handle_error(struct super_block *sb)
74 {
75 struct jfs_sb_info *sbi = JFS_SBI(sb);
76
77 if (sb->s_flags & MS_RDONLY)
78 return;
79
80 updateSuper(sb, FM_DIRTY);
81
82 if (sbi->flag & JFS_ERR_PANIC)
83 panic("JFS (device %s): panic forced after error\n",
84 sb->s_id);
85 else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
86 jfs_err("ERROR: (device %s): remounting filesystem "
87 "as read-only\n",
88 sb->s_id);
89 sb->s_flags |= MS_RDONLY;
90 }
91
92 /* nothing is done for continue beyond marking the superblock dirty */
93 }
94
95 void jfs_error(struct super_block *sb, const char * function, ...)
96 {
97 static char error_buf[256];
98 va_list args;
99
100 va_start(args, function);
101 vsnprintf(error_buf, sizeof(error_buf), function, args);
102 va_end(args);
103
104 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
105
106 jfs_handle_error(sb);
107 }
108
109 static struct inode *jfs_alloc_inode(struct super_block *sb)
110 {
111 struct jfs_inode_info *jfs_inode;
112
113 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
114 if (!jfs_inode)
115 return NULL;
116 return &jfs_inode->vfs_inode;
117 }
118
119 static void jfs_destroy_inode(struct inode *inode)
120 {
121 struct jfs_inode_info *ji = JFS_IP(inode);
122
123 BUG_ON(!list_empty(&ji->anon_inode_list));
124
125 spin_lock_irq(&ji->ag_lock);
126 if (ji->active_ag != -1) {
127 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
128 atomic_dec(&bmap->db_active[ji->active_ag]);
129 ji->active_ag = -1;
130 }
131 spin_unlock_irq(&ji->ag_lock);
132 kmem_cache_free(jfs_inode_cachep, ji);
133 }
134
135 static void jfs_clear_inode(struct inode *inode)
136 {
137 dquot_drop(inode);
138 }
139
140 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
141 {
142 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
143 s64 maxinodes;
144 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
145
146 jfs_info("In jfs_statfs");
147 buf->f_type = JFS_SUPER_MAGIC;
148 buf->f_bsize = sbi->bsize;
149 buf->f_blocks = sbi->bmap->db_mapsize;
150 buf->f_bfree = sbi->bmap->db_nfree;
151 buf->f_bavail = sbi->bmap->db_nfree;
152 /*
153 * If we really return the number of allocated & free inodes, some
154 * applications will fail because they won't see enough free inodes.
155 * We'll try to calculate some guess as to how may inodes we can
156 * really allocate
157 *
158 * buf->f_files = atomic_read(&imap->im_numinos);
159 * buf->f_ffree = atomic_read(&imap->im_numfree);
160 */
161 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
162 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
163 << L2INOSPEREXT), (s64) 0xffffffffLL);
164 buf->f_files = maxinodes;
165 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
166 atomic_read(&imap->im_numfree));
167 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
168 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
169 sizeof(sbi->uuid)/2);
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
182 lock_kernel();
183
184 rc = jfs_umount(sb);
185 if (rc)
186 jfs_err("jfs_umount failed with return code %d", rc);
187
188 unload_nls(sbi->nls_tab);
189
190 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
191 iput(sbi->direct_inode);
192
193 kfree(sbi);
194
195 unlock_kernel();
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 lock_kernel();
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 unlock_kernel();
381 return -EROFS;
382 }
383 rc = jfs_extendfs(sb, newLVSize, 0);
384 if (rc) {
385 unlock_kernel();
386 return rc;
387 }
388 }
389
390 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
391 /*
392 * Invalidate any previously read metadata. fsck may have
393 * changed the on-disk data since we mounted r/o
394 */
395 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
396
397 JFS_SBI(sb)->flag = flag;
398 ret = jfs_mount_rw(sb, 1);
399 unlock_kernel();
400 return ret;
401 }
402 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
403 rc = jfs_umount_rw(sb);
404 JFS_SBI(sb)->flag = flag;
405 unlock_kernel();
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 unlock_kernel();
413 return rc;
414 }
415 JFS_SBI(sb)->flag = flag;
416 ret = jfs_mount_rw(sb, 1);
417 unlock_kernel();
418 return ret;
419 }
420 JFS_SBI(sb)->flag = flag;
421
422 unlock_kernel();
423 return 0;
424 }
425
426 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
427 {
428 struct jfs_sb_info *sbi;
429 struct inode *inode;
430 int rc;
431 s64 newLVSize = 0;
432 int flag, ret = -EINVAL;
433
434 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
435
436 if (!new_valid_dev(sb->s_bdev->bd_dev))
437 return -EOVERFLOW;
438
439 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
440 if (!sbi)
441 return -ENOMEM;
442 sb->s_fs_info = sbi;
443 sbi->sb = sb;
444 sbi->uid = sbi->gid = sbi->umask = -1;
445
446 /* initialize the mount flag and determine the default error handler */
447 flag = JFS_ERR_REMOUNT_RO;
448
449 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
450 kfree(sbi);
451 return -EINVAL;
452 }
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 return -EINVAL;
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
475 /*
476 * Initialize direct-mapping inode/address-space
477 */
478 inode = new_inode(sb);
479 if (inode == NULL) {
480 ret = -ENOMEM;
481 goto out_kfree;
482 }
483 inode->i_ino = 0;
484 inode->i_nlink = 1;
485 inode->i_size = sb->s_bdev->bd_inode->i_size;
486 inode->i_mapping->a_ops = &jfs_metapage_aops;
487 insert_inode_hash(inode);
488 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
489
490 sbi->direct_inode = inode;
491
492 rc = jfs_mount(sb);
493 if (rc) {
494 if (!silent) {
495 jfs_err("jfs_mount failed w/return code = %d", rc);
496 }
497 goto out_mount_failed;
498 }
499 if (sb->s_flags & MS_RDONLY)
500 sbi->log = NULL;
501 else {
502 rc = jfs_mount_rw(sb, 0);
503 if (rc) {
504 if (!silent) {
505 jfs_err("jfs_mount_rw failed, return code = %d",
506 rc);
507 }
508 goto out_no_rw;
509 }
510 }
511
512 sb->s_magic = JFS_SUPER_MAGIC;
513
514 inode = jfs_iget(sb, ROOT_I);
515 if (IS_ERR(inode)) {
516 ret = PTR_ERR(inode);
517 goto out_no_rw;
518 }
519 sb->s_root = d_alloc_root(inode);
520 if (!sb->s_root)
521 goto out_no_root;
522
523 if (sbi->mntflag & JFS_OS2)
524 sb->s_root->d_op = &jfs_ci_dentry_operations;
525
526 /* logical blocks are represented by 40 bits in pxd_t, etc. */
527 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
528 #if BITS_PER_LONG == 32
529 /*
530 * Page cache is indexed by long.
531 * I would use MAX_LFS_FILESIZE, but it's only half as big
532 */
533 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
534 #endif
535 sb->s_time_gran = 1;
536 return 0;
537
538 out_no_root:
539 jfs_err("jfs_read_super: get root dentry failed");
540 iput(inode);
541
542 out_no_rw:
543 rc = jfs_umount(sb);
544 if (rc) {
545 jfs_err("jfs_umount failed with return code %d", rc);
546 }
547 out_mount_failed:
548 filemap_write_and_wait(sbi->direct_inode->i_mapping);
549 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
550 make_bad_inode(sbi->direct_inode);
551 iput(sbi->direct_inode);
552 sbi->direct_inode = NULL;
553 out_kfree:
554 if (sbi->nls_tab)
555 unload_nls(sbi->nls_tab);
556 kfree(sbi);
557 return ret;
558 }
559
560 static int jfs_freeze(struct super_block *sb)
561 {
562 struct jfs_sb_info *sbi = JFS_SBI(sb);
563 struct jfs_log *log = sbi->log;
564
565 if (!(sb->s_flags & MS_RDONLY)) {
566 txQuiesce(sb);
567 lmLogShutdown(log);
568 updateSuper(sb, FM_CLEAN);
569 }
570 return 0;
571 }
572
573 static int jfs_unfreeze(struct super_block *sb)
574 {
575 struct jfs_sb_info *sbi = JFS_SBI(sb);
576 struct jfs_log *log = sbi->log;
577 int rc = 0;
578
579 if (!(sb->s_flags & MS_RDONLY)) {
580 updateSuper(sb, FM_MOUNT);
581 if ((rc = lmLogInit(log)))
582 jfs_err("jfs_unlock failed with return code %d", rc);
583 else
584 txResume(sb);
585 }
586 return 0;
587 }
588
589 static int jfs_get_sb(struct file_system_type *fs_type,
590 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
591 {
592 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
593 mnt);
594 }
595
596 static int jfs_sync_fs(struct super_block *sb, int wait)
597 {
598 struct jfs_log *log = JFS_SBI(sb)->log;
599
600 /* log == NULL indicates read-only mount */
601 if (log) {
602 jfs_flush_journal(log, wait);
603 jfs_syncpt(log, 0);
604 }
605
606 return 0;
607 }
608
609 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
610 {
611 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
612
613 if (sbi->uid != -1)
614 seq_printf(seq, ",uid=%d", sbi->uid);
615 if (sbi->gid != -1)
616 seq_printf(seq, ",gid=%d", sbi->gid);
617 if (sbi->umask != -1)
618 seq_printf(seq, ",umask=%03o", sbi->umask);
619 if (sbi->flag & JFS_NOINTEGRITY)
620 seq_puts(seq, ",nointegrity");
621 if (sbi->nls_tab)
622 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
623 if (sbi->flag & JFS_ERR_CONTINUE)
624 seq_printf(seq, ",errors=continue");
625 if (sbi->flag & JFS_ERR_PANIC)
626 seq_printf(seq, ",errors=panic");
627
628 #ifdef CONFIG_QUOTA
629 if (sbi->flag & JFS_USRQUOTA)
630 seq_puts(seq, ",usrquota");
631
632 if (sbi->flag & JFS_GRPQUOTA)
633 seq_puts(seq, ",grpquota");
634 #endif
635
636 return 0;
637 }
638
639 #ifdef CONFIG_QUOTA
640
641 /* Read data from quotafile - avoid pagecache and such because we cannot afford
642 * acquiring the locks... As quota files are never truncated and quota code
643 * itself serializes the operations (and noone else should touch the files)
644 * we don't have to be afraid of races */
645 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
646 size_t len, loff_t off)
647 {
648 struct inode *inode = sb_dqopt(sb)->files[type];
649 sector_t blk = off >> sb->s_blocksize_bits;
650 int err = 0;
651 int offset = off & (sb->s_blocksize - 1);
652 int tocopy;
653 size_t toread;
654 struct buffer_head tmp_bh;
655 struct buffer_head *bh;
656 loff_t i_size = i_size_read(inode);
657
658 if (off > i_size)
659 return 0;
660 if (off+len > i_size)
661 len = i_size-off;
662 toread = len;
663 while (toread > 0) {
664 tocopy = sb->s_blocksize - offset < toread ?
665 sb->s_blocksize - offset : toread;
666
667 tmp_bh.b_state = 0;
668 tmp_bh.b_size = 1 << inode->i_blkbits;
669 err = jfs_get_block(inode, blk, &tmp_bh, 0);
670 if (err)
671 return err;
672 if (!buffer_mapped(&tmp_bh)) /* A hole? */
673 memset(data, 0, tocopy);
674 else {
675 bh = sb_bread(sb, tmp_bh.b_blocknr);
676 if (!bh)
677 return -EIO;
678 memcpy(data, bh->b_data+offset, tocopy);
679 brelse(bh);
680 }
681 offset = 0;
682 toread -= tocopy;
683 data += tocopy;
684 blk++;
685 }
686 return len;
687 }
688
689 /* Write to quotafile */
690 static ssize_t jfs_quota_write(struct super_block *sb, int type,
691 const char *data, size_t len, loff_t off)
692 {
693 struct inode *inode = sb_dqopt(sb)->files[type];
694 sector_t blk = off >> sb->s_blocksize_bits;
695 int err = 0;
696 int offset = off & (sb->s_blocksize - 1);
697 int tocopy;
698 size_t towrite = len;
699 struct buffer_head tmp_bh;
700 struct buffer_head *bh;
701
702 mutex_lock(&inode->i_mutex);
703 while (towrite > 0) {
704 tocopy = sb->s_blocksize - offset < towrite ?
705 sb->s_blocksize - offset : towrite;
706
707 tmp_bh.b_state = 0;
708 tmp_bh.b_size = 1 << inode->i_blkbits;
709 err = jfs_get_block(inode, blk, &tmp_bh, 1);
710 if (err)
711 goto out;
712 if (offset || tocopy != sb->s_blocksize)
713 bh = sb_bread(sb, tmp_bh.b_blocknr);
714 else
715 bh = sb_getblk(sb, tmp_bh.b_blocknr);
716 if (!bh) {
717 err = -EIO;
718 goto out;
719 }
720 lock_buffer(bh);
721 memcpy(bh->b_data+offset, data, tocopy);
722 flush_dcache_page(bh->b_page);
723 set_buffer_uptodate(bh);
724 mark_buffer_dirty(bh);
725 unlock_buffer(bh);
726 brelse(bh);
727 offset = 0;
728 towrite -= tocopy;
729 data += tocopy;
730 blk++;
731 }
732 out:
733 if (len == towrite) {
734 mutex_unlock(&inode->i_mutex);
735 return err;
736 }
737 if (inode->i_size < off+len-towrite)
738 i_size_write(inode, off+len-towrite);
739 inode->i_version++;
740 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
741 mark_inode_dirty(inode);
742 mutex_unlock(&inode->i_mutex);
743 return len - towrite;
744 }
745
746 #endif
747
748 static const struct super_operations jfs_super_operations = {
749 .alloc_inode = jfs_alloc_inode,
750 .destroy_inode = jfs_destroy_inode,
751 .dirty_inode = jfs_dirty_inode,
752 .write_inode = jfs_write_inode,
753 .delete_inode = jfs_delete_inode,
754 .clear_inode = jfs_clear_inode,
755 .put_super = jfs_put_super,
756 .sync_fs = jfs_sync_fs,
757 .freeze_fs = jfs_freeze,
758 .unfreeze_fs = jfs_unfreeze,
759 .statfs = jfs_statfs,
760 .remount_fs = jfs_remount,
761 .show_options = jfs_show_options,
762 #ifdef CONFIG_QUOTA
763 .quota_read = jfs_quota_read,
764 .quota_write = jfs_quota_write,
765 #endif
766 };
767
768 static const struct export_operations jfs_export_operations = {
769 .fh_to_dentry = jfs_fh_to_dentry,
770 .fh_to_parent = jfs_fh_to_parent,
771 .get_parent = jfs_get_parent,
772 };
773
774 static struct file_system_type jfs_fs_type = {
775 .owner = THIS_MODULE,
776 .name = "jfs",
777 .get_sb = jfs_get_sb,
778 .kill_sb = kill_block_super,
779 .fs_flags = FS_REQUIRES_DEV,
780 };
781
782 static void init_once(void *foo)
783 {
784 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
785
786 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
787 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
788 init_rwsem(&jfs_ip->rdwrlock);
789 mutex_init(&jfs_ip->commit_mutex);
790 init_rwsem(&jfs_ip->xattr_sem);
791 spin_lock_init(&jfs_ip->ag_lock);
792 jfs_ip->active_ag = -1;
793 inode_init_once(&jfs_ip->vfs_inode);
794 }
795
796 static int __init init_jfs_fs(void)
797 {
798 int i;
799 int rc;
800
801 jfs_inode_cachep =
802 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
803 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
804 init_once);
805 if (jfs_inode_cachep == NULL)
806 return -ENOMEM;
807
808 /*
809 * Metapage initialization
810 */
811 rc = metapage_init();
812 if (rc) {
813 jfs_err("metapage_init failed w/rc = %d", rc);
814 goto free_slab;
815 }
816
817 /*
818 * Transaction Manager initialization
819 */
820 rc = txInit();
821 if (rc) {
822 jfs_err("txInit failed w/rc = %d", rc);
823 goto free_metapage;
824 }
825
826 /*
827 * I/O completion thread (endio)
828 */
829 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
830 if (IS_ERR(jfsIOthread)) {
831 rc = PTR_ERR(jfsIOthread);
832 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
833 goto end_txmngr;
834 }
835
836 if (commit_threads < 1)
837 commit_threads = num_online_cpus();
838 if (commit_threads > MAX_COMMIT_THREADS)
839 commit_threads = MAX_COMMIT_THREADS;
840
841 for (i = 0; i < commit_threads; i++) {
842 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
843 if (IS_ERR(jfsCommitThread[i])) {
844 rc = PTR_ERR(jfsCommitThread[i]);
845 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
846 commit_threads = i;
847 goto kill_committask;
848 }
849 }
850
851 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
852 if (IS_ERR(jfsSyncThread)) {
853 rc = PTR_ERR(jfsSyncThread);
854 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
855 goto kill_committask;
856 }
857
858 #ifdef PROC_FS_JFS
859 jfs_proc_init();
860 #endif
861
862 return register_filesystem(&jfs_fs_type);
863
864 kill_committask:
865 for (i = 0; i < commit_threads; i++)
866 kthread_stop(jfsCommitThread[i]);
867 kthread_stop(jfsIOthread);
868 end_txmngr:
869 txExit();
870 free_metapage:
871 metapage_exit();
872 free_slab:
873 kmem_cache_destroy(jfs_inode_cachep);
874 return rc;
875 }
876
877 static void __exit exit_jfs_fs(void)
878 {
879 int i;
880
881 jfs_info("exit_jfs_fs called");
882
883 txExit();
884 metapage_exit();
885
886 kthread_stop(jfsIOthread);
887 for (i = 0; i < commit_threads; i++)
888 kthread_stop(jfsCommitThread[i]);
889 kthread_stop(jfsSyncThread);
890 #ifdef PROC_FS_JFS
891 jfs_proc_clean();
892 #endif
893 unregister_filesystem(&jfs_fs_type);
894 kmem_cache_destroy(jfs_inode_cachep);
895 }
896
897 module_init(init_jfs_fs)
898 module_exit(exit_jfs_fs)
kernel source for telekom puls (alcatel/mediatek)