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Staging: line6: needs to select SND_PCM
[linux-kbuild.git] / fs / jfs / super.c
blobb38f96bef8292ffe040eaa8b55b8f156bcad3702
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 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
183
184 lock_kernel();
185
186 rc = jfs_umount(sb);
187 if (rc)
188 jfs_err("jfs_umount failed with return code %d", rc);
189
190 unload_nls(sbi->nls_tab);
191
192 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
193 iput(sbi->direct_inode);
194
195 kfree(sbi);
196
197 unlock_kernel();
198 }
199
200 enum {
201 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
202 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
203 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
204 };
205
206 static const match_table_t tokens = {
207 {Opt_integrity, "integrity"},
208 {Opt_nointegrity, "nointegrity"},
209 {Opt_iocharset, "iocharset=%s"},
210 {Opt_resize, "resize=%u"},
211 {Opt_resize_nosize, "resize"},
212 {Opt_errors, "errors=%s"},
213 {Opt_ignore, "noquota"},
214 {Opt_ignore, "quota"},
215 {Opt_usrquota, "usrquota"},
216 {Opt_grpquota, "grpquota"},
217 {Opt_uid, "uid=%u"},
218 {Opt_gid, "gid=%u"},
219 {Opt_umask, "umask=%u"},
220 {Opt_err, NULL}
221 };
222
223 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
224 int *flag)
225 {
226 void *nls_map = (void *)-1; /* -1: no change; NULL: none */
227 char *p;
228 struct jfs_sb_info *sbi = JFS_SBI(sb);
229
230 *newLVSize = 0;
231
232 if (!options)
233 return 1;
234
235 while ((p = strsep(&options, ",")) != NULL) {
236 substring_t args[MAX_OPT_ARGS];
237 int token;
238 if (!*p)
239 continue;
240
241 token = match_token(p, tokens, args);
242 switch (token) {
243 case Opt_integrity:
244 *flag &= ~JFS_NOINTEGRITY;
245 break;
246 case Opt_nointegrity:
247 *flag |= JFS_NOINTEGRITY;
248 break;
249 case Opt_ignore:
250 /* Silently ignore the quota options */
251 /* Don't do anything ;-) */
252 break;
253 case Opt_iocharset:
254 if (nls_map && nls_map != (void *) -1)
255 unload_nls(nls_map);
256 if (!strcmp(args[0].from, "none"))
257 nls_map = NULL;
258 else {
259 nls_map = load_nls(args[0].from);
260 if (!nls_map) {
261 printk(KERN_ERR
262 "JFS: charset not found\n");
263 goto cleanup;
264 }
265 }
266 break;
267 case Opt_resize:
268 {
269 char *resize = args[0].from;
270 *newLVSize = simple_strtoull(resize, &resize, 0);
271 break;
272 }
273 case Opt_resize_nosize:
274 {
275 *newLVSize = sb->s_bdev->bd_inode->i_size >>
276 sb->s_blocksize_bits;
277 if (*newLVSize == 0)
278 printk(KERN_ERR
279 "JFS: Cannot determine volume size\n");
280 break;
281 }
282 case Opt_errors:
283 {
284 char *errors = args[0].from;
285 if (!errors || !*errors)
286 goto cleanup;
287 if (!strcmp(errors, "continue")) {
288 *flag &= ~JFS_ERR_REMOUNT_RO;
289 *flag &= ~JFS_ERR_PANIC;
290 *flag |= JFS_ERR_CONTINUE;
291 } else if (!strcmp(errors, "remount-ro")) {
292 *flag &= ~JFS_ERR_CONTINUE;
293 *flag &= ~JFS_ERR_PANIC;
294 *flag |= JFS_ERR_REMOUNT_RO;
295 } else if (!strcmp(errors, "panic")) {
296 *flag &= ~JFS_ERR_CONTINUE;
297 *flag &= ~JFS_ERR_REMOUNT_RO;
298 *flag |= JFS_ERR_PANIC;
299 } else {
300 printk(KERN_ERR
301 "JFS: %s is an invalid error handler\n",
302 errors);
303 goto cleanup;
304 }
305 break;
306 }
307
308 #ifdef CONFIG_QUOTA
309 case Opt_quota:
310 case Opt_usrquota:
311 *flag |= JFS_USRQUOTA;
312 break;
313 case Opt_grpquota:
314 *flag |= JFS_GRPQUOTA;
315 break;
316 #else
317 case Opt_usrquota:
318 case Opt_grpquota:
319 case Opt_quota:
320 printk(KERN_ERR
321 "JFS: quota operations not supported\n");
322 break;
323 #endif
324 case Opt_uid:
325 {
326 char *uid = args[0].from;
327 sbi->uid = simple_strtoul(uid, &uid, 0);
328 break;
329 }
330 case Opt_gid:
331 {
332 char *gid = args[0].from;
333 sbi->gid = simple_strtoul(gid, &gid, 0);
334 break;
335 }
336 case Opt_umask:
337 {
338 char *umask = args[0].from;
339 sbi->umask = simple_strtoul(umask, &umask, 8);
340 if (sbi->umask & ~0777) {
341 printk(KERN_ERR
342 "JFS: Invalid value of umask\n");
343 goto cleanup;
344 }
345 break;
346 }
347 default:
348 printk("jfs: Unrecognized mount option \"%s\" "
349 " or missing value\n", p);
350 goto cleanup;
351 }
352 }
353
354 if (nls_map != (void *) -1) {
355 /* Discard old (if remount) */
356 unload_nls(sbi->nls_tab);
357 sbi->nls_tab = nls_map;
358 }
359 return 1;
360
361 cleanup:
362 if (nls_map && nls_map != (void *) -1)
363 unload_nls(nls_map);
364 return 0;
365 }
366
367 static int jfs_remount(struct super_block *sb, int *flags, char *data)
368 {
369 s64 newLVSize = 0;
370 int rc = 0;
371 int flag = JFS_SBI(sb)->flag;
372 int ret;
373
374 if (!parse_options(data, sb, &newLVSize, &flag)) {
375 return -EINVAL;
376 }
377 lock_kernel();
378 if (newLVSize) {
379 if (sb->s_flags & MS_RDONLY) {
380 printk(KERN_ERR
381 "JFS: resize requires volume to be mounted read-write\n");
382 unlock_kernel();
383 return -EROFS;
384 }
385 rc = jfs_extendfs(sb, newLVSize, 0);
386 if (rc) {
387 unlock_kernel();
388 return rc;
389 }
390 }
391
392 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
393 /*
394 * Invalidate any previously read metadata. fsck may have
395 * changed the on-disk data since we mounted r/o
396 */
397 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
398
399 JFS_SBI(sb)->flag = flag;
400 ret = jfs_mount_rw(sb, 1);
401
402 /* mark the fs r/w for quota activity */
403 sb->s_flags &= ~MS_RDONLY;
404
405 unlock_kernel();
406 dquot_resume(sb, -1);
407 return ret;
408 }
409 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
410 rc = dquot_suspend(sb, -1);
411 if (rc < 0) {
412 unlock_kernel();
413 return rc;
414 }
415 rc = jfs_umount_rw(sb);
416 JFS_SBI(sb)->flag = flag;
417 unlock_kernel();
418 return rc;
419 }
420 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
421 if (!(sb->s_flags & MS_RDONLY)) {
422 rc = jfs_umount_rw(sb);
423 if (rc) {
424 unlock_kernel();
425 return rc;
426 }
427 JFS_SBI(sb)->flag = flag;
428 ret = jfs_mount_rw(sb, 1);
429 unlock_kernel();
430 return ret;
431 }
432 JFS_SBI(sb)->flag = flag;
433
434 unlock_kernel();
435 return 0;
436 }
437
438 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
439 {
440 struct jfs_sb_info *sbi;
441 struct inode *inode;
442 int rc;
443 s64 newLVSize = 0;
444 int flag, ret = -EINVAL;
445
446 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
447
448 if (!new_valid_dev(sb->s_bdev->bd_dev))
449 return -EOVERFLOW;
450
451 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
452 if (!sbi)
453 return -ENOMEM;
454 sb->s_fs_info = sbi;
455 sbi->sb = sb;
456 sbi->uid = sbi->gid = sbi->umask = -1;
457
458 /* initialize the mount flag and determine the default error handler */
459 flag = JFS_ERR_REMOUNT_RO;
460
461 if (!parse_options((char *) data, sb, &newLVSize, &flag))
462 goto out_kfree;
463 sbi->flag = flag;
464
465 #ifdef CONFIG_JFS_POSIX_ACL
466 sb->s_flags |= MS_POSIXACL;
467 #endif
468
469 if (newLVSize) {
470 printk(KERN_ERR "resize option for remount only\n");
471 goto out_kfree;
472 }
473
474 /*
475 * Initialize blocksize to 4K.
476 */
477 sb_set_blocksize(sb, PSIZE);
478
479 /*
480 * Set method vectors.
481 */
482 sb->s_op = &jfs_super_operations;
483 sb->s_export_op = &jfs_export_operations;
484 #ifdef CONFIG_QUOTA
485 sb->dq_op = &dquot_operations;
486 sb->s_qcop = &dquot_quotactl_ops;
487 #endif
488
489 /*
490 * Initialize direct-mapping inode/address-space
491 */
492 inode = new_inode(sb);
493 if (inode == NULL) {
494 ret = -ENOMEM;
495 goto out_unload;
496 }
497 inode->i_ino = 0;
498 inode->i_nlink = 1;
499 inode->i_size = sb->s_bdev->bd_inode->i_size;
500 inode->i_mapping->a_ops = &jfs_metapage_aops;
501 insert_inode_hash(inode);
502 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
503
504 sbi->direct_inode = inode;
505
506 rc = jfs_mount(sb);
507 if (rc) {
508 if (!silent) {
509 jfs_err("jfs_mount failed w/return code = %d", rc);
510 }
511 goto out_mount_failed;
512 }
513 if (sb->s_flags & MS_RDONLY)
514 sbi->log = NULL;
515 else {
516 rc = jfs_mount_rw(sb, 0);
517 if (rc) {
518 if (!silent) {
519 jfs_err("jfs_mount_rw failed, return code = %d",
520 rc);
521 }
522 goto out_no_rw;
523 }
524 }
525
526 sb->s_magic = JFS_SUPER_MAGIC;
527
528 inode = jfs_iget(sb, ROOT_I);
529 if (IS_ERR(inode)) {
530 ret = PTR_ERR(inode);
531 goto out_no_rw;
532 }
533 sb->s_root = d_alloc_root(inode);
534 if (!sb->s_root)
535 goto out_no_root;
536
537 if (sbi->mntflag & JFS_OS2)
538 sb->s_root->d_op = &jfs_ci_dentry_operations;
539
540 /* logical blocks are represented by 40 bits in pxd_t, etc. */
541 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
542 #if BITS_PER_LONG == 32
543 /*
544 * Page cache is indexed by long.
545 * I would use MAX_LFS_FILESIZE, but it's only half as big
546 */
547 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
548 #endif
549 sb->s_time_gran = 1;
550 return 0;
551
552 out_no_root:
553 jfs_err("jfs_read_super: get root dentry failed");
554 iput(inode);
555
556 out_no_rw:
557 rc = jfs_umount(sb);
558 if (rc) {
559 jfs_err("jfs_umount failed with return code %d", rc);
560 }
561 out_mount_failed:
562 filemap_write_and_wait(sbi->direct_inode->i_mapping);
563 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
564 make_bad_inode(sbi->direct_inode);
565 iput(sbi->direct_inode);
566 sbi->direct_inode = NULL;
567 out_unload:
568 if (sbi->nls_tab)
569 unload_nls(sbi->nls_tab);
570 out_kfree:
571 kfree(sbi);
572 return ret;
573 }
574
575 static int jfs_freeze(struct super_block *sb)
576 {
577 struct jfs_sb_info *sbi = JFS_SBI(sb);
578 struct jfs_log *log = sbi->log;
579
580 if (!(sb->s_flags & MS_RDONLY)) {
581 txQuiesce(sb);
582 lmLogShutdown(log);
583 updateSuper(sb, FM_CLEAN);
584 }
585 return 0;
586 }
587
588 static int jfs_unfreeze(struct super_block *sb)
589 {
590 struct jfs_sb_info *sbi = JFS_SBI(sb);
591 struct jfs_log *log = sbi->log;
592 int rc = 0;
593
594 if (!(sb->s_flags & MS_RDONLY)) {
595 updateSuper(sb, FM_MOUNT);
596 if ((rc = lmLogInit(log)))
597 jfs_err("jfs_unlock failed with return code %d", rc);
598 else
599 txResume(sb);
600 }
601 return 0;
602 }
603
604 static int jfs_get_sb(struct file_system_type *fs_type,
605 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
606 {
607 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
608 mnt);
609 }
610
611 static int jfs_sync_fs(struct super_block *sb, int wait)
612 {
613 struct jfs_log *log = JFS_SBI(sb)->log;
614
615 /* log == NULL indicates read-only mount */
616 if (log) {
617 jfs_flush_journal(log, wait);
618 jfs_syncpt(log, 0);
619 }
620
621 return 0;
622 }
623
624 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
625 {
626 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
627
628 if (sbi->uid != -1)
629 seq_printf(seq, ",uid=%d", sbi->uid);
630 if (sbi->gid != -1)
631 seq_printf(seq, ",gid=%d", sbi->gid);
632 if (sbi->umask != -1)
633 seq_printf(seq, ",umask=%03o", sbi->umask);
634 if (sbi->flag & JFS_NOINTEGRITY)
635 seq_puts(seq, ",nointegrity");
636 if (sbi->nls_tab)
637 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
638 if (sbi->flag & JFS_ERR_CONTINUE)
639 seq_printf(seq, ",errors=continue");
640 if (sbi->flag & JFS_ERR_PANIC)
641 seq_printf(seq, ",errors=panic");
642
643 #ifdef CONFIG_QUOTA
644 if (sbi->flag & JFS_USRQUOTA)
645 seq_puts(seq, ",usrquota");
646
647 if (sbi->flag & JFS_GRPQUOTA)
648 seq_puts(seq, ",grpquota");
649 #endif
650
651 return 0;
652 }
653
654 #ifdef CONFIG_QUOTA
655
656 /* Read data from quotafile - avoid pagecache and such because we cannot afford
657 * acquiring the locks... As quota files are never truncated and quota code
658 * itself serializes the operations (and noone else should touch the files)
659 * we don't have to be afraid of races */
660 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
661 size_t len, loff_t off)
662 {
663 struct inode *inode = sb_dqopt(sb)->files[type];
664 sector_t blk = off >> sb->s_blocksize_bits;
665 int err = 0;
666 int offset = off & (sb->s_blocksize - 1);
667 int tocopy;
668 size_t toread;
669 struct buffer_head tmp_bh;
670 struct buffer_head *bh;
671 loff_t i_size = i_size_read(inode);
672
673 if (off > i_size)
674 return 0;
675 if (off+len > i_size)
676 len = i_size-off;
677 toread = len;
678 while (toread > 0) {
679 tocopy = sb->s_blocksize - offset < toread ?
680 sb->s_blocksize - offset : toread;
681
682 tmp_bh.b_state = 0;
683 tmp_bh.b_size = 1 << inode->i_blkbits;
684 err = jfs_get_block(inode, blk, &tmp_bh, 0);
685 if (err)
686 return err;
687 if (!buffer_mapped(&tmp_bh)) /* A hole? */
688 memset(data, 0, tocopy);
689 else {
690 bh = sb_bread(sb, tmp_bh.b_blocknr);
691 if (!bh)
692 return -EIO;
693 memcpy(data, bh->b_data+offset, tocopy);
694 brelse(bh);
695 }
696 offset = 0;
697 toread -= tocopy;
698 data += tocopy;
699 blk++;
700 }
701 return len;
702 }
703
704 /* Write to quotafile */
705 static ssize_t jfs_quota_write(struct super_block *sb, int type,
706 const char *data, size_t len, loff_t off)
707 {
708 struct inode *inode = sb_dqopt(sb)->files[type];
709 sector_t blk = off >> sb->s_blocksize_bits;
710 int err = 0;
711 int offset = off & (sb->s_blocksize - 1);
712 int tocopy;
713 size_t towrite = len;
714 struct buffer_head tmp_bh;
715 struct buffer_head *bh;
716
717 mutex_lock(&inode->i_mutex);
718 while (towrite > 0) {
719 tocopy = sb->s_blocksize - offset < towrite ?
720 sb->s_blocksize - offset : towrite;
721
722 tmp_bh.b_state = 0;
723 tmp_bh.b_size = 1 << inode->i_blkbits;
724 err = jfs_get_block(inode, blk, &tmp_bh, 1);
725 if (err)
726 goto out;
727 if (offset || tocopy != sb->s_blocksize)
728 bh = sb_bread(sb, tmp_bh.b_blocknr);
729 else
730 bh = sb_getblk(sb, tmp_bh.b_blocknr);
731 if (!bh) {
732 err = -EIO;
733 goto out;
734 }
735 lock_buffer(bh);
736 memcpy(bh->b_data+offset, data, tocopy);
737 flush_dcache_page(bh->b_page);
738 set_buffer_uptodate(bh);
739 mark_buffer_dirty(bh);
740 unlock_buffer(bh);
741 brelse(bh);
742 offset = 0;
743 towrite -= tocopy;
744 data += tocopy;
745 blk++;
746 }
747 out:
748 if (len == towrite) {
749 mutex_unlock(&inode->i_mutex);
750 return err;
751 }
752 if (inode->i_size < off+len-towrite)
753 i_size_write(inode, off+len-towrite);
754 inode->i_version++;
755 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
756 mark_inode_dirty(inode);
757 mutex_unlock(&inode->i_mutex);
758 return len - towrite;
759 }
760
761 #endif
762
763 static const struct super_operations jfs_super_operations = {
764 .alloc_inode = jfs_alloc_inode,
765 .destroy_inode = jfs_destroy_inode,
766 .dirty_inode = jfs_dirty_inode,
767 .write_inode = jfs_write_inode,
768 .delete_inode = jfs_delete_inode,
769 .clear_inode = jfs_clear_inode,
770 .put_super = jfs_put_super,
771 .sync_fs = jfs_sync_fs,
772 .freeze_fs = jfs_freeze,
773 .unfreeze_fs = jfs_unfreeze,
774 .statfs = jfs_statfs,
775 .remount_fs = jfs_remount,
776 .show_options = jfs_show_options,
777 #ifdef CONFIG_QUOTA
778 .quota_read = jfs_quota_read,
779 .quota_write = jfs_quota_write,
780 #endif
781 };
782
783 static const struct export_operations jfs_export_operations = {
784 .fh_to_dentry = jfs_fh_to_dentry,
785 .fh_to_parent = jfs_fh_to_parent,
786 .get_parent = jfs_get_parent,
787 };
788
789 static struct file_system_type jfs_fs_type = {
790 .owner = THIS_MODULE,
791 .name = "jfs",
792 .get_sb = jfs_get_sb,
793 .kill_sb = kill_block_super,
794 .fs_flags = FS_REQUIRES_DEV,
795 };
796
797 static void init_once(void *foo)
798 {
799 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
800
801 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
802 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
803 init_rwsem(&jfs_ip->rdwrlock);
804 mutex_init(&jfs_ip->commit_mutex);
805 init_rwsem(&jfs_ip->xattr_sem);
806 spin_lock_init(&jfs_ip->ag_lock);
807 jfs_ip->active_ag = -1;
808 inode_init_once(&jfs_ip->vfs_inode);
809 }
810
811 static int __init init_jfs_fs(void)
812 {
813 int i;
814 int rc;
815
816 jfs_inode_cachep =
817 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
818 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
819 init_once);
820 if (jfs_inode_cachep == NULL)
821 return -ENOMEM;
822
823 /*
824 * Metapage initialization
825 */
826 rc = metapage_init();
827 if (rc) {
828 jfs_err("metapage_init failed w/rc = %d", rc);
829 goto free_slab;
830 }
831
832 /*
833 * Transaction Manager initialization
834 */
835 rc = txInit();
836 if (rc) {
837 jfs_err("txInit failed w/rc = %d", rc);
838 goto free_metapage;
839 }
840
841 /*
842 * I/O completion thread (endio)
843 */
844 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
845 if (IS_ERR(jfsIOthread)) {
846 rc = PTR_ERR(jfsIOthread);
847 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
848 goto end_txmngr;
849 }
850
851 if (commit_threads < 1)
852 commit_threads = num_online_cpus();
853 if (commit_threads > MAX_COMMIT_THREADS)
854 commit_threads = MAX_COMMIT_THREADS;
855
856 for (i = 0; i < commit_threads; i++) {
857 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
858 if (IS_ERR(jfsCommitThread[i])) {
859 rc = PTR_ERR(jfsCommitThread[i]);
860 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
861 commit_threads = i;
862 goto kill_committask;
863 }
864 }
865
866 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
867 if (IS_ERR(jfsSyncThread)) {
868 rc = PTR_ERR(jfsSyncThread);
869 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
870 goto kill_committask;
871 }
872
873 #ifdef PROC_FS_JFS
874 jfs_proc_init();
875 #endif
876
877 return register_filesystem(&jfs_fs_type);
878
879 kill_committask:
880 for (i = 0; i < commit_threads; i++)
881 kthread_stop(jfsCommitThread[i]);
882 kthread_stop(jfsIOthread);
883 end_txmngr:
884 txExit();
885 free_metapage:
886 metapage_exit();
887 free_slab:
888 kmem_cache_destroy(jfs_inode_cachep);
889 return rc;
890 }
891
892 static void __exit exit_jfs_fs(void)
893 {
894 int i;
895
896 jfs_info("exit_jfs_fs called");
897
898 txExit();
899 metapage_exit();
900
901 kthread_stop(jfsIOthread);
902 for (i = 0; i < commit_threads; i++)
903 kthread_stop(jfsCommitThread[i]);
904 kthread_stop(jfsSyncThread);
905 #ifdef PROC_FS_JFS
906 jfs_proc_clean();
907 #endif
908 unregister_filesystem(&jfs_fs_type);
909 kmem_cache_destroy(jfs_inode_cachep);
910 }
911
912 module_init(init_jfs_fs)
913 module_exit(exit_jfs_fs)
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