kernel: Move GPL'd kernel files to sys/gnu to have them all in one place.
[dragonfly.git] / sys / gnu / vfs / ext2fs / ext2_subr.c
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1/*
2 * modified for Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 */
7/*
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)ext2_subr.c 8.2 (Berkeley) 9/21/93
40 * $FreeBSD: src/sys/gnu/ext2fs/ext2_subr.c,v 1.13.2.2 2000/08/03 18:48:27 peter Exp $
41 */
42
43#include <sys/param.h>
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44
45#include <sys/lock.h>
46#include <sys/systm.h>
47#include <sys/ucred.h>
48#include <sys/vnode.h>
984263bc 49#include <sys/buf.h>
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50
51#include "quota.h"
52#include "inode.h"
53#include "ext2_extern.h"
54#include "ext2_fs_sb.h"
55#include "fs.h"
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56
57#include "opt_ddb.h"
58
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59/*
60 * Return buffer with the contents of block "offset" from the beginning of
61 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
62 * remaining space in the directory.
63 */
64int
0f7f7a49 65ext2_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
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66{
67 struct inode *ip;
f7aae92f 68 struct ext2_sb_info *fs;
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69 struct buf *bp;
70 daddr_t lbn;
71 int bsize, error;
72
73 ip = VTOI(vp);
74 fs = ip->i_e2fs;
75 lbn = lblkno(fs, offset);
76 bsize = blksize(fs, ip, lbn);
77
78 *bpp = NULL;
54078292 79 if ((error = bread(vp, lblktodoff(fs, lbn), bsize, &bp)) != 0) {
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80 brelse(bp);
81 return (error);
82 }
83 if (res)
84 *res = (char *)bp->b_data + blkoff(fs, offset);
85 *bpp = bp;
86 return (0);
87}