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davinci: dm644x evm: setup NAND flash timing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jfs / super.c
blobec8c3e4baca3f78d666c33982d7040afcf73628b
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 int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
136 {
137 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
138 s64 maxinodes;
139 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
140
141 jfs_info("In jfs_statfs");
142 buf->f_type = JFS_SUPER_MAGIC;
143 buf->f_bsize = sbi->bsize;
144 buf->f_blocks = sbi->bmap->db_mapsize;
145 buf->f_bfree = sbi->bmap->db_nfree;
146 buf->f_bavail = sbi->bmap->db_nfree;
147 /*
148 * If we really return the number of allocated & free inodes, some
149 * applications will fail because they won't see enough free inodes.
150 * We'll try to calculate some guess as to how may inodes we can
151 * really allocate
152 *
153 * buf->f_files = atomic_read(&imap->im_numinos);
154 * buf->f_ffree = atomic_read(&imap->im_numfree);
155 */
156 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
157 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
158 << L2INOSPEREXT), (s64) 0xffffffffLL);
159 buf->f_files = maxinodes;
160 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
161 atomic_read(&imap->im_numfree));
162 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
163 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
164 sizeof(sbi->uuid)/2);
165
166 buf->f_namelen = JFS_NAME_MAX;
167 return 0;
168 }
169
170 static void jfs_put_super(struct super_block *sb)
171 {
172 struct jfs_sb_info *sbi = JFS_SBI(sb);
173 int rc;
174
175 jfs_info("In jfs_put_super");
176
177 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
178
179 lock_kernel();
180
181 rc = jfs_umount(sb);
182 if (rc)
183 jfs_err("jfs_umount failed with return code %d", rc);
184
185 unload_nls(sbi->nls_tab);
186
187 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
188 iput(sbi->direct_inode);
189
190 kfree(sbi);
191
192 unlock_kernel();
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 const 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 unload_nls(sbi->nls_tab);
352 sbi->nls_tab = nls_map;
353 }
354 return 1;
355
356 cleanup:
357 if (nls_map && nls_map != (void *) -1)
358 unload_nls(nls_map);
359 return 0;
360 }
361
362 static int jfs_remount(struct super_block *sb, int *flags, char *data)
363 {
364 s64 newLVSize = 0;
365 int rc = 0;
366 int flag = JFS_SBI(sb)->flag;
367 int ret;
368
369 if (!parse_options(data, sb, &newLVSize, &flag)) {
370 return -EINVAL;
371 }
372 lock_kernel();
373 if (newLVSize) {
374 if (sb->s_flags & MS_RDONLY) {
375 printk(KERN_ERR
376 "JFS: resize requires volume to be mounted read-write\n");
377 unlock_kernel();
378 return -EROFS;
379 }
380 rc = jfs_extendfs(sb, newLVSize, 0);
381 if (rc) {
382 unlock_kernel();
383 return rc;
384 }
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 unlock_kernel();
401 dquot_resume(sb, -1);
402 return ret;
403 }
404 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
405 rc = dquot_suspend(sb, -1);
406 if (rc < 0) {
407 unlock_kernel();
408 return rc;
409 }
410 rc = jfs_umount_rw(sb);
411 JFS_SBI(sb)->flag = flag;
412 unlock_kernel();
413 return rc;
414 }
415 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
416 if (!(sb->s_flags & MS_RDONLY)) {
417 rc = jfs_umount_rw(sb);
418 if (rc) {
419 unlock_kernel();
420 return rc;
421 }
422 JFS_SBI(sb)->flag = flag;
423 ret = jfs_mount_rw(sb, 1);
424 unlock_kernel();
425 return ret;
426 }
427 JFS_SBI(sb)->flag = flag;
428
429 unlock_kernel();
430 return 0;
431 }
432
433 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
434 {
435 struct jfs_sb_info *sbi;
436 struct inode *inode;
437 int rc;
438 s64 newLVSize = 0;
439 int flag, ret = -EINVAL;
440
441 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
442
443 if (!new_valid_dev(sb->s_bdev->bd_dev))
444 return -EOVERFLOW;
445
446 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
447 if (!sbi)
448 return -ENOMEM;
449 sb->s_fs_info = sbi;
450 sbi->sb = sb;
451 sbi->uid = sbi->gid = sbi->umask = -1;
452
453 /* initialize the mount flag and determine the default error handler */
454 flag = JFS_ERR_REMOUNT_RO;
455
456 if (!parse_options((char *) data, sb, &newLVSize, &flag))
457 goto out_kfree;
458 sbi->flag = flag;
459
460 #ifdef CONFIG_JFS_POSIX_ACL
461 sb->s_flags |= MS_POSIXACL;
462 #endif
463
464 if (newLVSize) {
465 printk(KERN_ERR "resize option for remount only\n");
466 goto out_kfree;
467 }
468
469 /*
470 * Initialize blocksize to 4K.
471 */
472 sb_set_blocksize(sb, PSIZE);
473
474 /*
475 * Set method vectors.
476 */
477 sb->s_op = &jfs_super_operations;
478 sb->s_export_op = &jfs_export_operations;
479 #ifdef CONFIG_QUOTA
480 sb->dq_op = &dquot_operations;
481 sb->s_qcop = &dquot_quotactl_ops;
482 #endif
483
484 /*
485 * Initialize direct-mapping inode/address-space
486 */
487 inode = new_inode(sb);
488 if (inode == NULL) {
489 ret = -ENOMEM;
490 goto out_unload;
491 }
492 inode->i_ino = 0;
493 inode->i_nlink = 1;
494 inode->i_size = sb->s_bdev->bd_inode->i_size;
495 inode->i_mapping->a_ops = &jfs_metapage_aops;
496 insert_inode_hash(inode);
497 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
498
499 sbi->direct_inode = inode;
500
501 rc = jfs_mount(sb);
502 if (rc) {
503 if (!silent) {
504 jfs_err("jfs_mount failed w/return code = %d", rc);
505 }
506 goto out_mount_failed;
507 }
508 if (sb->s_flags & MS_RDONLY)
509 sbi->log = NULL;
510 else {
511 rc = jfs_mount_rw(sb, 0);
512 if (rc) {
513 if (!silent) {
514 jfs_err("jfs_mount_rw failed, return code = %d",
515 rc);
516 }
517 goto out_no_rw;
518 }
519 }
520
521 sb->s_magic = JFS_SUPER_MAGIC;
522
523 inode = jfs_iget(sb, ROOT_I);
524 if (IS_ERR(inode)) {
525 ret = PTR_ERR(inode);
526 goto out_no_rw;
527 }
528 sb->s_root = d_alloc_root(inode);
529 if (!sb->s_root)
530 goto out_no_root;
531
532 if (sbi->mntflag & JFS_OS2)
533 sb->s_root->d_op = &jfs_ci_dentry_operations;
534
535 /* logical blocks are represented by 40 bits in pxd_t, etc. */
536 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
537 #if BITS_PER_LONG == 32
538 /*
539 * Page cache is indexed by long.
540 * I would use MAX_LFS_FILESIZE, but it's only half as big
541 */
542 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
543 #endif
544 sb->s_time_gran = 1;
545 return 0;
546
547 out_no_root:
548 jfs_err("jfs_read_super: get root dentry failed");
549 iput(inode);
550
551 out_no_rw:
552 rc = jfs_umount(sb);
553 if (rc) {
554 jfs_err("jfs_umount failed with return code %d", rc);
555 }
556 out_mount_failed:
557 filemap_write_and_wait(sbi->direct_inode->i_mapping);
558 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
559 make_bad_inode(sbi->direct_inode);
560 iput(sbi->direct_inode);
561 sbi->direct_inode = NULL;
562 out_unload:
563 if (sbi->nls_tab)
564 unload_nls(sbi->nls_tab);
565 out_kfree:
566 kfree(sbi);
567 return ret;
568 }
569
570 static int jfs_freeze(struct super_block *sb)
571 {
572 struct jfs_sb_info *sbi = JFS_SBI(sb);
573 struct jfs_log *log = sbi->log;
574
575 if (!(sb->s_flags & MS_RDONLY)) {
576 txQuiesce(sb);
577 lmLogShutdown(log);
578 updateSuper(sb, FM_CLEAN);
579 }
580 return 0;
581 }
582
583 static int jfs_unfreeze(struct super_block *sb)
584 {
585 struct jfs_sb_info *sbi = JFS_SBI(sb);
586 struct jfs_log *log = sbi->log;
587 int rc = 0;
588
589 if (!(sb->s_flags & MS_RDONLY)) {
590 updateSuper(sb, FM_MOUNT);
591 if ((rc = lmLogInit(log)))
592 jfs_err("jfs_unlock failed with return code %d", rc);
593 else
594 txResume(sb);
595 }
596 return 0;
597 }
598
599 static int jfs_get_sb(struct file_system_type *fs_type,
600 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
601 {
602 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
603 mnt);
604 }
605
606 static int jfs_sync_fs(struct super_block *sb, int wait)
607 {
608 struct jfs_log *log = JFS_SBI(sb)->log;
609
610 /* log == NULL indicates read-only mount */
611 if (log) {
612 jfs_flush_journal(log, wait);
613 jfs_syncpt(log, 0);
614 }
615
616 return 0;
617 }
618
619 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
620 {
621 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
622
623 if (sbi->uid != -1)
624 seq_printf(seq, ",uid=%d", sbi->uid);
625 if (sbi->gid != -1)
626 seq_printf(seq, ",gid=%d", sbi->gid);
627 if (sbi->umask != -1)
628 seq_printf(seq, ",umask=%03o", sbi->umask);
629 if (sbi->flag & JFS_NOINTEGRITY)
630 seq_puts(seq, ",nointegrity");
631 if (sbi->nls_tab)
632 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
633 if (sbi->flag & JFS_ERR_CONTINUE)
634 seq_printf(seq, ",errors=continue");
635 if (sbi->flag & JFS_ERR_PANIC)
636 seq_printf(seq, ",errors=panic");
637
638 #ifdef CONFIG_QUOTA
639 if (sbi->flag & JFS_USRQUOTA)
640 seq_puts(seq, ",usrquota");
641
642 if (sbi->flag & JFS_GRPQUOTA)
643 seq_puts(seq, ",grpquota");
644 #endif
645
646 return 0;
647 }
648
649 #ifdef CONFIG_QUOTA
650
651 /* Read data from quotafile - avoid pagecache and such because we cannot afford
652 * acquiring the locks... As quota files are never truncated and quota code
653 * itself serializes the operations (and noone else should touch the files)
654 * we don't have to be afraid of races */
655 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
656 size_t len, loff_t off)
657 {
658 struct inode *inode = sb_dqopt(sb)->files[type];
659 sector_t blk = off >> sb->s_blocksize_bits;
660 int err = 0;
661 int offset = off & (sb->s_blocksize - 1);
662 int tocopy;
663 size_t toread;
664 struct buffer_head tmp_bh;
665 struct buffer_head *bh;
666 loff_t i_size = i_size_read(inode);
667
668 if (off > i_size)
669 return 0;
670 if (off+len > i_size)
671 len = i_size-off;
672 toread = len;
673 while (toread > 0) {
674 tocopy = sb->s_blocksize - offset < toread ?
675 sb->s_blocksize - offset : toread;
676
677 tmp_bh.b_state = 0;
678 tmp_bh.b_size = 1 << inode->i_blkbits;
679 err = jfs_get_block(inode, blk, &tmp_bh, 0);
680 if (err)
681 return err;
682 if (!buffer_mapped(&tmp_bh)) /* A hole? */
683 memset(data, 0, tocopy);
684 else {
685 bh = sb_bread(sb, tmp_bh.b_blocknr);
686 if (!bh)
687 return -EIO;
688 memcpy(data, bh->b_data+offset, tocopy);
689 brelse(bh);
690 }
691 offset = 0;
692 toread -= tocopy;
693 data += tocopy;
694 blk++;
695 }
696 return len;
697 }
698
699 /* Write to quotafile */
700 static ssize_t jfs_quota_write(struct super_block *sb, int type,
701 const char *data, size_t len, loff_t off)
702 {
703 struct inode *inode = sb_dqopt(sb)->files[type];
704 sector_t blk = off >> sb->s_blocksize_bits;
705 int err = 0;
706 int offset = off & (sb->s_blocksize - 1);
707 int tocopy;
708 size_t towrite = len;
709 struct buffer_head tmp_bh;
710 struct buffer_head *bh;
711
712 mutex_lock(&inode->i_mutex);
713 while (towrite > 0) {
714 tocopy = sb->s_blocksize - offset < towrite ?
715 sb->s_blocksize - offset : towrite;
716
717 tmp_bh.b_state = 0;
718 tmp_bh.b_size = 1 << inode->i_blkbits;
719 err = jfs_get_block(inode, blk, &tmp_bh, 1);
720 if (err)
721 goto out;
722 if (offset || tocopy != sb->s_blocksize)
723 bh = sb_bread(sb, tmp_bh.b_blocknr);
724 else
725 bh = sb_getblk(sb, tmp_bh.b_blocknr);
726 if (!bh) {
727 err = -EIO;
728 goto out;
729 }
730 lock_buffer(bh);
731 memcpy(bh->b_data+offset, data, tocopy);
732 flush_dcache_page(bh->b_page);
733 set_buffer_uptodate(bh);
734 mark_buffer_dirty(bh);
735 unlock_buffer(bh);
736 brelse(bh);
737 offset = 0;
738 towrite -= tocopy;
739 data += tocopy;
740 blk++;
741 }
742 out:
743 if (len == towrite) {
744 mutex_unlock(&inode->i_mutex);
745 return err;
746 }
747 if (inode->i_size < off+len-towrite)
748 i_size_write(inode, off+len-towrite);
749 inode->i_version++;
750 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
751 mark_inode_dirty(inode);
752 mutex_unlock(&inode->i_mutex);
753 return len - towrite;
754 }
755
756 #endif
757
758 static const struct super_operations jfs_super_operations = {
759 .alloc_inode = jfs_alloc_inode,
760 .destroy_inode = jfs_destroy_inode,
761 .dirty_inode = jfs_dirty_inode,
762 .write_inode = jfs_write_inode,
763 .evict_inode = jfs_evict_inode,
764 .put_super = jfs_put_super,
765 .sync_fs = jfs_sync_fs,
766 .freeze_fs = jfs_freeze,
767 .unfreeze_fs = jfs_unfreeze,
768 .statfs = jfs_statfs,
769 .remount_fs = jfs_remount,
770 .show_options = jfs_show_options,
771 #ifdef CONFIG_QUOTA
772 .quota_read = jfs_quota_read,
773 .quota_write = jfs_quota_write,
774 #endif
775 };
776
777 static const struct export_operations jfs_export_operations = {
778 .fh_to_dentry = jfs_fh_to_dentry,
779 .fh_to_parent = jfs_fh_to_parent,
780 .get_parent = jfs_get_parent,
781 };
782
783 static struct file_system_type jfs_fs_type = {
784 .owner = THIS_MODULE,
785 .name = "jfs",
786 .get_sb = jfs_get_sb,
787 .kill_sb = kill_block_super,
788 .fs_flags = FS_REQUIRES_DEV,
789 };
790
791 static void init_once(void *foo)
792 {
793 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
794
795 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
796 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
797 init_rwsem(&jfs_ip->rdwrlock);
798 mutex_init(&jfs_ip->commit_mutex);
799 init_rwsem(&jfs_ip->xattr_sem);
800 spin_lock_init(&jfs_ip->ag_lock);
801 jfs_ip->active_ag = -1;
802 inode_init_once(&jfs_ip->vfs_inode);
803 }
804
805 static int __init init_jfs_fs(void)
806 {
807 int i;
808 int rc;
809
810 jfs_inode_cachep =
811 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
812 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
813 init_once);
814 if (jfs_inode_cachep == NULL)
815 return -ENOMEM;
816
817 /*
818 * Metapage initialization
819 */
820 rc = metapage_init();
821 if (rc) {
822 jfs_err("metapage_init failed w/rc = %d", rc);
823 goto free_slab;
824 }
825
826 /*
827 * Transaction Manager initialization
828 */
829 rc = txInit();
830 if (rc) {
831 jfs_err("txInit failed w/rc = %d", rc);
832 goto free_metapage;
833 }
834
835 /*
836 * I/O completion thread (endio)
837 */
838 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
839 if (IS_ERR(jfsIOthread)) {
840 rc = PTR_ERR(jfsIOthread);
841 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
842 goto end_txmngr;
843 }
844
845 if (commit_threads < 1)
846 commit_threads = num_online_cpus();
847 if (commit_threads > MAX_COMMIT_THREADS)
848 commit_threads = MAX_COMMIT_THREADS;
849
850 for (i = 0; i < commit_threads; i++) {
851 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
852 if (IS_ERR(jfsCommitThread[i])) {
853 rc = PTR_ERR(jfsCommitThread[i]);
854 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
855 commit_threads = i;
856 goto kill_committask;
857 }
858 }
859
860 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
861 if (IS_ERR(jfsSyncThread)) {
862 rc = PTR_ERR(jfsSyncThread);
863 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
864 goto kill_committask;
865 }
866
867 #ifdef PROC_FS_JFS
868 jfs_proc_init();
869 #endif
870
871 return register_filesystem(&jfs_fs_type);
872
873 kill_committask:
874 for (i = 0; i < commit_threads; i++)
875 kthread_stop(jfsCommitThread[i]);
876 kthread_stop(jfsIOthread);
877 end_txmngr:
878 txExit();
879 free_metapage:
880 metapage_exit();
881 free_slab:
882 kmem_cache_destroy(jfs_inode_cachep);
883 return rc;
884 }
885
886 static void __exit exit_jfs_fs(void)
887 {
888 int i;
889
890 jfs_info("exit_jfs_fs called");
891
892 txExit();
893 metapage_exit();
894
895 kthread_stop(jfsIOthread);
896 for (i = 0; i < commit_threads; i++)
897 kthread_stop(jfsCommitThread[i]);
898 kthread_stop(jfsSyncThread);
899 #ifdef PROC_FS_JFS
900 jfs_proc_clean();
901 #endif
902 unregister_filesystem(&jfs_fs_type);
903 kmem_cache_destroy(jfs_inode_cachep);
904 }
905
906 module_init(init_jfs_fs)
907 module_exit(exit_jfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree