1 /* $OpenBSD: ext2fs_subr.c,v 1.12 2005/07/03 20:14:01 drahn Exp $ */
2 /* $NetBSD: ext2fs_subr.c,v 1.1 1997/06/11 09:34:03 bouyer Exp $ */
3
4 /*
5 * Copyright (c) 1997 Manuel Bouyer.
6 * Copyright (c) 1982, 1986, 1989, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
34 * Modified for ext2fs by Manuel Bouyer.
35 */
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/vnode.h>
40 #include <sys/mount.h>
41 #include <sys/buf.h>
42
43 #include <ufs/ufs/quota.h>
44 #include <ufs/ufs/inode.h>
45 #include <ufs/ufs/ufsmount.h>
46
47 #include <ufs/ext2fs/ext2fs.h>
48 #include <ufs/ext2fs/ext2fs_extern.h>
49
50 #ifdef _KERNEL
51
52 /*
53 * Return buffer with the contents of block "offset" from the beginning of
54 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
55 * remaining space in the directory.
56 */
57 int
ext2fs_bufatoff(struct inode * ip,off_t offset,char ** res,struct buf ** bpp)58 ext2fs_bufatoff(struct inode *ip, off_t offset, char **res, struct buf **bpp)
59 {
60 struct vnode *vp;
61 struct m_ext2fs *fs;
62 struct buf *bp;
63 ufs1_daddr_t lbn;
64 int error;
65
66 vp = ITOV(ip);
67 fs = ip->i_e2fs;
68 lbn = lblkno(fs, offset);
69
70 *bpp = NULL;
71 if ((error = bread(vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) {
72 brelse(bp);
73 return (error);
74 }
75 if (res)
76 *res = (char *)bp->b_data + blkoff(fs, offset);
77 *bpp = bp;
78 return (0);
79 }
80 #endif
81
82 #if defined(_KERNEL) && defined(DIAGNOSTIC)
83 void
ext2fs_checkoverlap(bp,ip)84 ext2fs_checkoverlap(bp, ip)
85 struct buf *bp;
86 struct inode *ip;
87 {
88 struct buf *ebp, *ep;
89 ufs1_daddr_t start, last;
90 struct vnode *vp;
91
92 ebp = &buf[nbuf];
93 start = bp->b_blkno;
94 last = start + btodb(bp->b_bcount) - 1;
95 for (ep = buf; ep < ebp; ep++) {
96 if (ep == bp || (ep->b_flags & B_INVAL) ||
97 ep->b_vp == NULLVP)
98 continue;
99 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL))
100 continue;
101 if (vp != ip->i_devvp)
102 continue;
103 /* look for overlap */
104 if (ep->b_bcount == 0 || ep->b_blkno > last ||
105 ep->b_blkno + btodb(ep->b_bcount) <= start)
106 continue;
107 vprint("Disk overlap", vp);
108 printf("\tstart %d, end %d overlap start %d, end %ld\n",
109 start, last, ep->b_blkno,
110 ep->b_blkno + btodb(ep->b_bcount) - 1);
111 panic("Disk buffer overlap");
112 }
113 }
114 #endif /* DIAGNOSTIC */
115