| | 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> |
| | 44 | |
| | 45 | #include <sys/lock.h> |
| | 46 | #include <sys/systm.h> |
| | 47 | #include <sys/ucred.h> |
| | 48 | #include <sys/vnode.h> |
| | 49 | #include <sys/buf.h> |
| | 50 | |
| | 51 | #include "quota.h" |
| | 52 | #include "inode.h" |
| | 53 | #include "ext2_extern.h" |
| | 54 | #include "ext2_fs_sb.h" |
| | 55 | #include "fs.h" |
| | 56 | |
| | 57 | #include "opt_ddb.h" |
| | 58 | |
| | 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 | */ |
| | 64 | int |
| | 65 | ext2_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp) |
| | 66 | { |
| | 67 | struct inode *ip; |
| | 68 | struct ext2_sb_info *fs; |
| | 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; |
| | 79 | if ((error = bread(vp, lblktodoff(fs, lbn), bsize, &bp)) != 0) { |
| | 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 | } |
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