2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
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12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
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17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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35 * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
39 #include <sys/param.h>
42 #include <sys/systm.h>
46 #include <sys/ucred.h>
47 #include <sys/vnode.h>
49 #include <fs/ext2fs/inode.h>
50 #include <fs/ext2fs/ext2_extern.h>
51 #include <fs/ext2fs/ext2fs.h>
52 #include <fs/ext2fs/fs.h>
55 #include <fs/ext2fs/ext2_mount.h>
57 void ext2_checkoverlap(struct buf *, struct inode *);
61 * Return buffer with the contents of block "offset" from the beginning of
62 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
63 * remaining space in the directory.
66 ext2_blkatoff(vp, offset, res, bpp)
80 lbn = lblkno(fs, offset);
81 bsize = blksize(fs, ip, lbn);
84 if ((error = bread(vp, lbn, bsize, NOCRED, &bp)) != 0) {
89 *res = (char *)bp->b_data + blkoff(fs, offset);
96 ext2_checkoverlap(bp, ip)
100 struct buf *ebp, *ep;
106 last = start + btodb(bp->b_bcount) - 1;
107 for (ep = buf; ep < ebp; ep++) {
108 if (ep == bp || (ep->b_flags & B_INVAL))
110 vp = ip->i_ump->um_devvp;
111 /* look for overlap */
112 if (ep->b_bcount == 0 || ep->b_blkno > last ||
113 ep->b_blkno + btodb(ep->b_bcount) <= start)
115 vprint("Disk overlap", vp);
116 (void)printf("\tstart %d, end %d overlap start %lld, end %ld\n",
117 start, last, (long long)ep->b_blkno,
118 (long)(ep->b_blkno + btodb(ep->b_bcount) - 1));
119 panic("Disk buffer overlap");