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quota: kill the vfs_dq_off and vfs_dq_quota_on_remount wrappers
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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
400 /* mark the fs r/w for quota activity */
401 sb->s_flags &= ~MS_RDONLY;
402
403 unlock_kernel();
404 dquot_resume(sb, -1);
405 return ret;
406 }
407 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
408 rc = dquot_suspend(sb, -1);
409 if (rc < 0) {
410 unlock_kernel();
411 return rc;
412 }
413 rc = jfs_umount_rw(sb);
414 JFS_SBI(sb)->flag = flag;
415 unlock_kernel();
416 return rc;
417 }
418 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
419 if (!(sb->s_flags & MS_RDONLY)) {
420 rc = jfs_umount_rw(sb);
421 if (rc) {
422 unlock_kernel();
423 return rc;
424 }
425 JFS_SBI(sb)->flag = flag;
426 ret = jfs_mount_rw(sb, 1);
427 unlock_kernel();
428 return ret;
429 }
430 JFS_SBI(sb)->flag = flag;
431
432 unlock_kernel();
433 return 0;
434 }
435
436 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
437 {
438 struct jfs_sb_info *sbi;
439 struct inode *inode;
440 int rc;
441 s64 newLVSize = 0;
442 int flag, ret = -EINVAL;
443
444 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
445
446 if (!new_valid_dev(sb->s_bdev->bd_dev))
447 return -EOVERFLOW;
448
449 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
450 if (!sbi)
451 return -ENOMEM;
452 sb->s_fs_info = sbi;
453 sbi->sb = sb;
454 sbi->uid = sbi->gid = sbi->umask = -1;
455
456 /* initialize the mount flag and determine the default error handler */
457 flag = JFS_ERR_REMOUNT_RO;
458
459 if (!parse_options((char *) data, sb, &newLVSize, &flag))
460 goto out_kfree;
461 sbi->flag = flag;
462
463 #ifdef CONFIG_JFS_POSIX_ACL
464 sb->s_flags |= MS_POSIXACL;
465 #endif
466
467 if (newLVSize) {
468 printk(KERN_ERR "resize option for remount only\n");
469 goto out_kfree;
470 }
471
472 /*
473 * Initialize blocksize to 4K.
474 */
475 sb_set_blocksize(sb, PSIZE);
476
477 /*
478 * Set method vectors.
479 */
480 sb->s_op = &jfs_super_operations;
481 sb->s_export_op = &jfs_export_operations;
482
483 /*
484 * Initialize direct-mapping inode/address-space
485 */
486 inode = new_inode(sb);
487 if (inode == NULL) {
488 ret = -ENOMEM;
489 goto out_unload;
490 }
491 inode->i_ino = 0;
492 inode->i_nlink = 1;
493 inode->i_size = sb->s_bdev->bd_inode->i_size;
494 inode->i_mapping->a_ops = &jfs_metapage_aops;
495 insert_inode_hash(inode);
496 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
497
498 sbi->direct_inode = inode;
499
500 rc = jfs_mount(sb);
501 if (rc) {
502 if (!silent) {
503 jfs_err("jfs_mount failed w/return code = %d", rc);
504 }
505 goto out_mount_failed;
506 }
507 if (sb->s_flags & MS_RDONLY)
508 sbi->log = NULL;
509 else {
510 rc = jfs_mount_rw(sb, 0);
511 if (rc) {
512 if (!silent) {
513 jfs_err("jfs_mount_rw failed, return code = %d",
514 rc);
515 }
516 goto out_no_rw;
517 }
518 }
519
520 sb->s_magic = JFS_SUPER_MAGIC;
521
522 inode = jfs_iget(sb, ROOT_I);
523 if (IS_ERR(inode)) {
524 ret = PTR_ERR(inode);
525 goto out_no_rw;
526 }
527 sb->s_root = d_alloc_root(inode);
528 if (!sb->s_root)
529 goto out_no_root;
530
531 if (sbi->mntflag & JFS_OS2)
532 sb->s_root->d_op = &jfs_ci_dentry_operations;
533
534 /* logical blocks are represented by 40 bits in pxd_t, etc. */
535 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
536 #if BITS_PER_LONG == 32
537 /*
538 * Page cache is indexed by long.
539 * I would use MAX_LFS_FILESIZE, but it's only half as big
540 */
541 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
542 #endif
543 sb->s_time_gran = 1;
544 return 0;
545
546 out_no_root:
547 jfs_err("jfs_read_super: get root dentry failed");
548 iput(inode);
549
550 out_no_rw:
551 rc = jfs_umount(sb);
552 if (rc) {
553 jfs_err("jfs_umount failed with return code %d", rc);
554 }
555 out_mount_failed:
556 filemap_write_and_wait(sbi->direct_inode->i_mapping);
557 truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
558 make_bad_inode(sbi->direct_inode);
559 iput(sbi->direct_inode);
560 sbi->direct_inode = NULL;
561 out_unload:
562 if (sbi->nls_tab)
563 unload_nls(sbi->nls_tab);
564 out_kfree:
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 .clear_inode = jfs_clear_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)