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
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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.
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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 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_subr.c,v 1.10 2006/03/24 18:35:33 dillon Exp $
44 #include <sys/param.h>
45 #include "ext2_fs_sb.h"
49 #include <sys/systm.h>
50 #include <sys/ucred.h>
51 #include <sys/vnode.h>
52 #include "ext2_extern.h"
54 #include <vfs/ufs/quota.h>
55 #include <vfs/ufs/inode.h>
60 void ext2_checkoverlap (struct buf *, struct inode *);
64 * Return buffer with the contents of block "offset" from the beginning of
65 * directory "ip". If "res" is non-zero, fill it in with a pointer to the
66 * remaining space in the directory.
69 ext2_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
72 struct ext2_sb_info *fs;
79 lbn = lblkno(fs, offset);
80 bsize = blksize(fs, ip, lbn);
83 if ((error = bread(vp, lblktodoff(fs, lbn), bsize, &bp)) != 0) {
88 *res = (char *)bp->b_data + blkoff(fs, offset);
95 ext2_checkoverlap(struct buf *bp, struct inode *ip)
103 start = bp->b_bio2.bio_offset;
104 last = start + bp->b_bcount - 1;
105 for (ep = buf; ep < ebp; ep++) {
106 if (ep == bp || (ep->b_flags & B_INVAL) ||
107 ep->b_vp == NULLVP || ep->b_bio2.bio_offset == NOOFFSET)
109 if (VOP_BMAP(ep->b_vp, (off_t)0, &vp, NULL, NULL, NULL))
111 if (vp != ip->i_devvp)
113 /* look for overlap */
114 if (ep->b_bcount == 0 || ep->b_bio2.bio_offset > last ||
115 ep->b_bio2.bio_offset + ep->b_bcount <= start)
117 vprint("Disk overlap", vp);
118 printf("\tstart %lld, end %lld overlap start %lld, end %lld\n",
119 start, last, ep->b_bio2.bio_offset,
120 ep->b_bio2.bio_offset + ep->b_bcount - 1);
121 panic("Disk buffer overlap");