?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dma-mapping: add asm-generic/dma-mapping-common.h
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jfs / super.c
blob09b1b6ee21861507e834d7e32322db15d5b957bb
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 #include <linux/smp_lock.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_destroy_inode(struct inode *inode)
119 {
120 struct jfs_inode_info *ji = JFS_IP(inode);
121
122 BUG_ON(!list_empty(&ji->anon_inode_list));
123
124 spin_lock_irq(&ji->ag_lock);
125 if (ji->active_ag != -1) {
126 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
127 atomic_dec(&bmap->db_active[ji->active_ag]);
128 ji->active_ag = -1;
129 }
130 spin_unlock_irq(&ji->ag_lock);
131
132 #ifdef CONFIG_JFS_POSIX_ACL
133 if (ji->i_acl != JFS_ACL_NOT_CACHED) {
134 posix_acl_release(ji->i_acl);
135 ji->i_acl = JFS_ACL_NOT_CACHED;
136 }
137 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
138 posix_acl_release(ji->i_default_acl);
139 ji->i_default_acl = JFS_ACL_NOT_CACHED;
140 }
141 #endif
142
143 kmem_cache_free(jfs_inode_cachep, ji);
144 }
145
146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
147 {
148 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
149 s64 maxinodes;
150 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
151
152 jfs_info("In jfs_statfs");
153 buf->f_type = JFS_SUPER_MAGIC;
154 buf->f_bsize = sbi->bsize;
155 buf->f_blocks = sbi->bmap->db_mapsize;
156 buf->f_bfree = sbi->bmap->db_nfree;
157 buf->f_bavail = sbi->bmap->db_nfree;
158 /*
159 * If we really return the number of allocated & free inodes, some
160 * applications will fail because they won't see enough free inodes.
161 * We'll try to calculate some guess as to how may inodes we can
162 * really allocate
163 *
164 * buf->f_files = atomic_read(&imap->im_numinos);
165 * buf->f_ffree = atomic_read(&imap->im_numfree);
166 */
167 maxinodes = min((s64) atomic_read(&imap->im_numinos) +
168 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
169 << L2INOSPEREXT), (s64) 0xffffffffLL);
170 buf->f_files = maxinodes;
171 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
172 atomic_read(&imap->im_numfree));
173 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
174 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
175 sizeof(sbi->uuid)/2);
176
177 buf->f_namelen = JFS_NAME_MAX;
178 return 0;
179 }
180
181 static void jfs_put_super(struct super_block *sb)
182 {
183 struct jfs_sb_info *sbi = JFS_SBI(sb);
184 int rc;
185
186 jfs_info("In jfs_put_super");
187
188 lock_kernel();
189
190 rc = jfs_umount(sb);
191 if (rc)
192 jfs_err("jfs_umount failed with return code %d", rc);
193 if (sbi->nls_tab)
194 unload_nls(sbi->nls_tab);
195 sbi->nls_tab = NULL;
196
197 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
198 iput(sbi->direct_inode);
199 sbi->direct_inode = NULL;
200
201 kfree(sbi);
202
203 unlock_kernel();
204 }
205
206 enum {
207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
210 };
211
212 static const match_table_t tokens = {
213 {Opt_integrity, "integrity"},
214 {Opt_nointegrity, "nointegrity"},
215 {Opt_iocharset, "iocharset=%s"},
216 {Opt_resize, "resize=%u"},
217 {Opt_resize_nosize, "resize"},
218 {Opt_errors, "errors=%s"},
219 {Opt_ignore, "noquota"},
220 {Opt_ignore, "quota"},
221 {Opt_usrquota, "usrquota"},
222 {Opt_grpquota, "grpquota"},
223 {Opt_uid, "uid=%u"},
224 {Opt_gid, "gid=%u"},
225 {Opt_umask, "umask=%u"},
226 {Opt_err, NULL}
227 };
228
229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
230 int *flag)
231 {
232 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
233 char *p;
234 struct jfs_sb_info *sbi = JFS_SBI(sb);
235
236 *newLVSize = 0;
237
238 if (!options)
239 return 1;
240
241 while ((p = strsep(&options, ",")) != NULL) {
242 substring_t args[MAX_OPT_ARGS];
243 int token;
244 if (!*p)
245 continue;
246
247 token = match_token(p, tokens, args);
248 switch (token) {
249 case Opt_integrity:
250 *flag &= ~JFS_NOINTEGRITY;
251 break;
252 case Opt_nointegrity:
253 *flag |= JFS_NOINTEGRITY;
254 break;
255 case Opt_ignore:
256 /* Silently ignore the quota options */
257 /* Don't do anything ;-) */
258 break;
259 case Opt_iocharset:
260 if (nls_map && nls_map != (void *) -1)
261 unload_nls(nls_map);
262 if (!strcmp(args[0].from, "none"))
263 nls_map = NULL;
264 else {
265 nls_map = load_nls(args[0].from);
266 if (!nls_map) {
267 printk(KERN_ERR
268 "JFS: charset not found\n");
269 goto cleanup;
270 }
271 }
272 break;
273 case Opt_resize:
274 {
275 char *resize = args[0].from;
276 *newLVSize = simple_strtoull(resize, &resize, 0);
277 break;
278 }
279 case Opt_resize_nosize:
280 {
281 *newLVSize = sb->s_bdev->bd_inode->i_size >>
282 sb->s_blocksize_bits;
283 if (*newLVSize == 0)
284 printk(KERN_ERR
285 "JFS: Cannot determine volume size\n");
286 break;
287 }
288 case Opt_errors:
289 {
290 char *errors = args[0].from;
291 if (!errors || !*errors)
292 goto cleanup;
293 if (!strcmp(errors, "continue")) {
294 *flag &= ~JFS_ERR_REMOUNT_RO;
295 *flag &= ~JFS_ERR_PANIC;
296 *flag |= JFS_ERR_CONTINUE;
297 } else if (!strcmp(errors, "remount-ro")) {
298 *flag &= ~JFS_ERR_CONTINUE;
299 *flag &= ~JFS_ERR_PANIC;
300 *flag |= JFS_ERR_REMOUNT_RO;
301 } else if (!strcmp(errors, "panic")) {
302 *flag &= ~JFS_ERR_CONTINUE;
303 *flag &= ~JFS_ERR_REMOUNT_RO;
304 *flag |= JFS_ERR_PANIC;
305 } else {
306 printk(KERN_ERR
307 "JFS: %s is an invalid error handler\n",
308 errors);
309 goto cleanup;
310 }
311 break;
312 }
313
314 #ifdef CONFIG_QUOTA
315 case Opt_quota:
316 case Opt_usrquota:
317 *flag |= JFS_USRQUOTA;
318 break;
319 case Opt_grpquota:
320 *flag |= JFS_GRPQUOTA;
321 break;
322 #else
323 case Opt_usrquota:
324 case Opt_grpquota:
325 case Opt_quota:
326 printk(KERN_ERR
327 "JFS: quota operations not supported\n");
328 break;
329 #endif
330 case Opt_uid:
331 {
332 char *uid = args[0].from;
333 sbi->uid = simple_strtoul(uid, &uid, 0);
334 break;
335 }
336 case Opt_gid:
337 {
338 char *gid = args[0].from;
339 sbi->gid = simple_strtoul(gid, &gid, 0);
340 break;
341 }
342 case Opt_umask:
343 {
344 char *umask = args[0].from;
345 sbi->umask = simple_strtoul(umask, &umask, 8);
346 if (sbi->umask & ~0777) {
347 printk(KERN_ERR
348 "JFS: Invalid value of umask\n");
349 goto cleanup;
350 }
351 break;
352 }
353 default:
354 printk("jfs: Unrecognized mount option \"%s\" "
355 " or missing value\n", p);
356 goto cleanup;
357 }
358 }
359
360 if (nls_map != (void *) -1) {
361 /* Discard old (if remount) */
362 if (sbi->nls_tab)
363 unload_nls(sbi->nls_tab);
364 sbi->nls_tab = nls_map;
365 }
366 return 1;
367
368 cleanup:
369 if (nls_map && nls_map != (void *) -1)
370 unload_nls(nls_map);
371 return 0;
372 }
373
374 static int jfs_remount(struct super_block *sb, int *flags, char *data)
375 {
376 s64 newLVSize = 0;
377 int rc = 0;
378 int flag = JFS_SBI(sb)->flag;
379 int ret;
380
381 if (!parse_options(data, sb, &newLVSize, &flag)) {
382 return -EINVAL;
383 }
384 lock_kernel();
385 if (newLVSize) {
386 if (sb->s_flags & MS_RDONLY) {
387 printk(KERN_ERR
388 "JFS: resize requires volume to be mounted read-write\n");
389 unlock_kernel();
390 return -EROFS;
391 }
392 rc = jfs_extendfs(sb, newLVSize, 0);
393 if (rc) {
394 unlock_kernel();
395 return rc;
396 }
397 }
398
399 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
400 /*
401 * Invalidate any previously read metadata. fsck may have
402 * changed the on-disk data since we mounted r/o
403 */
404 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
405
406 JFS_SBI(sb)->flag = flag;
407 ret = jfs_mount_rw(sb, 1);
408 unlock_kernel();
409 return ret;
410 }
411 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
412 rc = jfs_umount_rw(sb);
413 JFS_SBI(sb)->flag = flag;
414 unlock_kernel();
415 return rc;
416 }
417 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
418 if (!(sb->s_flags & MS_RDONLY)) {
419 rc = jfs_umount_rw(sb);
420 if (rc) {
421 unlock_kernel();
422 return rc;
423 }
424 JFS_SBI(sb)->flag = flag;
425 ret = jfs_mount_rw(sb, 1);
426 unlock_kernel();
427 return ret;
428 }
429 JFS_SBI(sb)->flag = flag;
430
431 unlock_kernel();
432 return 0;
433 }
434
435 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
436 {
437 struct jfs_sb_info *sbi;
438 struct inode *inode;
439 int rc;
440 s64 newLVSize = 0;
441 int flag, ret = -EINVAL;
442
443 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
444
445 if (!new_valid_dev(sb->s_bdev->bd_dev))
446 return -EOVERFLOW;
447
448 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
449 if (!sbi)
450 return -ENOMEM;
451 sb->s_fs_info = sbi;
452 sbi->sb = sb;
453 sbi->uid = sbi->gid = sbi->umask = -1;
454
455 /* initialize the mount flag and determine the default error handler */
456 flag = JFS_ERR_REMOUNT_RO;
457
458 if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
459 kfree(sbi);
460 return -EINVAL;
461 }
462 sbi->flag = flag;
463
464 #ifdef CONFIG_JFS_POSIX_ACL
465 sb->s_flags |= MS_POSIXACL;
466 #endif
467
468 if (newLVSize) {
469 printk(KERN_ERR "resize option for remount only\n");
470 return -EINVAL;
471 }
472
473 /*
474 * Initialize blocksize to 4K.
475 */
476 sb_set_blocksize(sb, PSIZE);
477
478 /*
479 * Set method vectors.
480 */
481 sb->s_op = &jfs_super_operations;
482 sb->s_export_op = &jfs_export_operations;
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_kfree;
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, 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_kfree:
563 if (sbi->nls_tab)
564 unload_nls(sbi->nls_tab);
565 kfree(sbi);
566 return ret;
567 }
568
569 static int jfs_freeze(struct super_block *sb)
570 {
571 struct jfs_sb_info *sbi = JFS_SBI(sb);
572 struct jfs_log *log = sbi->log;
573
574 if (!(sb->s_flags & MS_RDONLY)) {
575 txQuiesce(sb);
576 lmLogShutdown(log);
577 updateSuper(sb, FM_CLEAN);
578 }
579 return 0;
580 }
581
582 static int jfs_unfreeze(struct super_block *sb)
583 {
584 struct jfs_sb_info *sbi = JFS_SBI(sb);
585 struct jfs_log *log = sbi->log;
586 int rc = 0;
587
588 if (!(sb->s_flags & MS_RDONLY)) {
589 updateSuper(sb, FM_MOUNT);
590 if ((rc = lmLogInit(log)))
591 jfs_err("jfs_unlock failed with return code %d", rc);
592 else
593 txResume(sb);
594 }
595 return 0;
596 }
597
598 static int jfs_get_sb(struct file_system_type *fs_type,
599 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
600 {
601 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
602 mnt);
603 }
604
605 static int jfs_sync_fs(struct super_block *sb, int wait)
606 {
607 struct jfs_log *log = JFS_SBI(sb)->log;
608
609 /* log == NULL indicates read-only mount */
610 if (log) {
611 jfs_flush_journal(log, wait);
612 jfs_syncpt(log, 0);
613 }
614
615 return 0;
616 }
617
618 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
619 {
620 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
621
622 if (sbi->uid != -1)
623 seq_printf(seq, ",uid=%d", sbi->uid);
624 if (sbi->gid != -1)
625 seq_printf(seq, ",gid=%d", sbi->gid);
626 if (sbi->umask != -1)
627 seq_printf(seq, ",umask=%03o", sbi->umask);
628 if (sbi->flag & JFS_NOINTEGRITY)
629 seq_puts(seq, ",nointegrity");
630 if (sbi->nls_tab)
631 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
632 if (sbi->flag & JFS_ERR_CONTINUE)
633 seq_printf(seq, ",errors=continue");
634 if (sbi->flag & JFS_ERR_PANIC)
635 seq_printf(seq, ",errors=panic");
636
637 #ifdef CONFIG_QUOTA
638 if (sbi->flag & JFS_USRQUOTA)
639 seq_puts(seq, ",usrquota");
640
641 if (sbi->flag & JFS_GRPQUOTA)
642 seq_puts(seq, ",grpquota");
643 #endif
644
645 return 0;
646 }
647
648 #ifdef CONFIG_QUOTA
649
650 /* Read data from quotafile - avoid pagecache and such because we cannot afford
651 * acquiring the locks... As quota files are never truncated and quota code
652 * itself serializes the operations (and noone else should touch the files)
653 * we don't have to be afraid of races */
654 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
655 size_t len, loff_t off)
656 {
657 struct inode *inode = sb_dqopt(sb)->files[type];
658 sector_t blk = off >> sb->s_blocksize_bits;
659 int err = 0;
660 int offset = off & (sb->s_blocksize - 1);
661 int tocopy;
662 size_t toread;
663 struct buffer_head tmp_bh;
664 struct buffer_head *bh;
665 loff_t i_size = i_size_read(inode);
666
667 if (off > i_size)
668 return 0;
669 if (off+len > i_size)
670 len = i_size-off;
671 toread = len;
672 while (toread > 0) {
673 tocopy = sb->s_blocksize - offset < toread ?
674 sb->s_blocksize - offset : toread;
675
676 tmp_bh.b_state = 0;
677 tmp_bh.b_size = 1 << inode->i_blkbits;
678 err = jfs_get_block(inode, blk, &tmp_bh, 0);
679 if (err)
680 return err;
681 if (!buffer_mapped(&tmp_bh)) /* A hole? */
682 memset(data, 0, tocopy);
683 else {
684 bh = sb_bread(sb, tmp_bh.b_blocknr);
685 if (!bh)
686 return -EIO;
687 memcpy(data, bh->b_data+offset, tocopy);
688 brelse(bh);
689 }
690 offset = 0;
691 toread -= tocopy;
692 data += tocopy;
693 blk++;
694 }
695 return len;
696 }
697
698 /* Write to quotafile */
699 static ssize_t jfs_quota_write(struct super_block *sb, int type,
700 const char *data, size_t len, loff_t off)
701 {
702 struct inode *inode = sb_dqopt(sb)->files[type];
703 sector_t blk = off >> sb->s_blocksize_bits;
704 int err = 0;
705 int offset = off & (sb->s_blocksize - 1);
706 int tocopy;
707 size_t towrite = len;
708 struct buffer_head tmp_bh;
709 struct buffer_head *bh;
710
711 mutex_lock(&inode->i_mutex);
712 while (towrite > 0) {
713 tocopy = sb->s_blocksize - offset < towrite ?
714 sb->s_blocksize - offset : towrite;
715
716 tmp_bh.b_state = 0;
717 tmp_bh.b_size = 1 << inode->i_blkbits;
718 err = jfs_get_block(inode, blk, &tmp_bh, 1);
719 if (err)
720 goto out;
721 if (offset || tocopy != sb->s_blocksize)
722 bh = sb_bread(sb, tmp_bh.b_blocknr);
723 else
724 bh = sb_getblk(sb, tmp_bh.b_blocknr);
725 if (!bh) {
726 err = -EIO;
727 goto out;
728 }
729 lock_buffer(bh);
730 memcpy(bh->b_data+offset, data, tocopy);
731 flush_dcache_page(bh->b_page);
732 set_buffer_uptodate(bh);
733 mark_buffer_dirty(bh);
734 unlock_buffer(bh);
735 brelse(bh);
736 offset = 0;
737 towrite -= tocopy;
738 data += tocopy;
739 blk++;
740 }
741 out:
742 if (len == towrite) {
743 mutex_unlock(&inode->i_mutex);
744 return err;
745 }
746 if (inode->i_size < off+len-towrite)
747 i_size_write(inode, off+len-towrite);
748 inode->i_version++;
749 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
750 mark_inode_dirty(inode);
751 mutex_unlock(&inode->i_mutex);
752 return len - towrite;
753 }
754
755 #endif
756
757 static const struct super_operations jfs_super_operations = {
758 .alloc_inode = jfs_alloc_inode,
759 .destroy_inode = jfs_destroy_inode,
760 .dirty_inode = jfs_dirty_inode,
761 .write_inode = jfs_write_inode,
762 .delete_inode = jfs_delete_inode,
763 .put_super = jfs_put_super,
764 .sync_fs = jfs_sync_fs,
765 .freeze_fs = jfs_freeze,
766 .unfreeze_fs = jfs_unfreeze,
767 .statfs = jfs_statfs,
768 .remount_fs = jfs_remount,
769 .show_options = jfs_show_options,
770 #ifdef CONFIG_QUOTA
771 .quota_read = jfs_quota_read,
772 .quota_write = jfs_quota_write,
773 #endif
774 };
775
776 static const struct export_operations jfs_export_operations = {
777 .fh_to_dentry = jfs_fh_to_dentry,
778 .fh_to_parent = jfs_fh_to_parent,
779 .get_parent = jfs_get_parent,
780 };
781
782 static struct file_system_type jfs_fs_type = {
783 .owner = THIS_MODULE,
784 .name = "jfs",
785 .get_sb = jfs_get_sb,
786 .kill_sb = kill_block_super,
787 .fs_flags = FS_REQUIRES_DEV,
788 };
789
790 static void init_once(void *foo)
791 {
792 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
793
794 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
795 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
796 init_rwsem(&jfs_ip->rdwrlock);
797 mutex_init(&jfs_ip->commit_mutex);
798 init_rwsem(&jfs_ip->xattr_sem);
799 spin_lock_init(&jfs_ip->ag_lock);
800 jfs_ip->active_ag = -1;
801 #ifdef CONFIG_JFS_POSIX_ACL
802 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
803 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
804 #endif
805 inode_init_once(&jfs_ip->vfs_inode);
806 }
807
808 static int __init init_jfs_fs(void)
809 {
810 int i;
811 int rc;
812
813 jfs_inode_cachep =
814 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
815 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
816 init_once);
817 if (jfs_inode_cachep == NULL)
818 return -ENOMEM;
819
820 /*
821 * Metapage initialization
822 */
823 rc = metapage_init();
824 if (rc) {
825 jfs_err("metapage_init failed w/rc = %d", rc);
826 goto free_slab;
827 }
828
829 /*
830 * Transaction Manager initialization
831 */
832 rc = txInit();
833 if (rc) {
834 jfs_err("txInit failed w/rc = %d", rc);
835 goto free_metapage;
836 }
837
838 /*
839 * I/O completion thread (endio)
840 */
841 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
842 if (IS_ERR(jfsIOthread)) {
843 rc = PTR_ERR(jfsIOthread);
844 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
845 goto end_txmngr;
846 }
847
848 if (commit_threads < 1)
849 commit_threads = num_online_cpus();
850 if (commit_threads > MAX_COMMIT_THREADS)
851 commit_threads = MAX_COMMIT_THREADS;
852
853 for (i = 0; i < commit_threads; i++) {
854 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
855 if (IS_ERR(jfsCommitThread[i])) {
856 rc = PTR_ERR(jfsCommitThread[i]);
857 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
858 commit_threads = i;
859 goto kill_committask;
860 }
861 }
862
863 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
864 if (IS_ERR(jfsSyncThread)) {
865 rc = PTR_ERR(jfsSyncThread);
866 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
867 goto kill_committask;
868 }
869
870 #ifdef PROC_FS_JFS
871 jfs_proc_init();
872 #endif
873
874 return register_filesystem(&jfs_fs_type);
875
876 kill_committask:
877 for (i = 0; i < commit_threads; i++)
878 kthread_stop(jfsCommitThread[i]);
879 kthread_stop(jfsIOthread);
880 end_txmngr:
881 txExit();
882 free_metapage:
883 metapage_exit();
884 free_slab:
885 kmem_cache_destroy(jfs_inode_cachep);
886 return rc;
887 }
888
889 static void __exit exit_jfs_fs(void)
890 {
891 int i;
892
893 jfs_info("exit_jfs_fs called");
894
895 txExit();
896 metapage_exit();
897
898 kthread_stop(jfsIOthread);
899 for (i = 0; i < commit_threads; i++)
900 kthread_stop(jfsCommitThread[i]);
901 kthread_stop(jfsSyncThread);
902 #ifdef PROC_FS_JFS
903 jfs_proc_clean();
904 #endif
905 unregister_filesystem(&jfs_fs_type);
906 kmem_cache_destroy(jfs_inode_cachep);
907 }
908
909 module_init(init_jfs_fs)
910 module_exit(exit_jfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree