2 * modified for Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
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9 * The Regents of the University of California. All rights reserved.
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21 * This product includes software developed by the University of
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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 1.7 2004/04/08 20:57:52 cpressey 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, lbn, bsize, &bp)) != 0) {
88 *res = (char *)bp->b_data + blkoff(fs, offset);
95 ext2_checkoverlap(struct buf *bp, struct inode *ip)
103 last = start + btodb(bp->b_bcount) - 1;
104 for (ep = buf; ep < ebp; ep++) {
105 if (ep == bp || (ep->b_flags & B_INVAL) ||
108 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL, NULL))
110 if (vp != ip->i_devvp)
112 /* look for overlap */
113 if (ep->b_bcount == 0 || ep->b_blkno > last ||
114 ep->b_blkno + btodb(ep->b_bcount) <= start)
116 vprint("Disk overlap", vp);
117 (void)printf("\tstart %d, end %d overlap start %d, end %d\n",
118 start, last, ep->b_blkno,
119 ep->b_blkno + btodb(ep->b_bcount) - 1);
120 panic("Disk buffer overlap");