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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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 1.3 2003/07/21 07:57:43 dillon Exp $
44 #include <sys/param.h>
45 #include <gnu/ext2fs/ext2_fs_sb.h>
46 #include <gnu/ext2fs/fs.h>
49 #include <sys/systm.h>
50 #include <sys/ucred.h>
51 #include <sys/vnode.h>
52 #include <gnu/ext2fs/ext2_extern.h>
54 #include <ufs/ufs/quota.h>
55 #include <ufs/ufs/inode.h>
60 void ext2_checkoverlap __P((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(vp, offset, res, bpp)
76 register struct ext2_sb_info *fs;
83 lbn = lblkno(fs, offset);
84 bsize = blksize(fs, ip, lbn);
87 if ((error = bread(vp, lbn, bsize, &bp)) != 0) {
92 *res = (char *)bp->b_data + blkoff(fs, offset);
99 ext2_checkoverlap(bp, ip)
103 register struct buf *ebp, *ep;
104 register daddr_t start, last;
109 last = start + btodb(bp->b_bcount) - 1;
110 for (ep = buf; ep < ebp; ep++) {
111 if (ep == bp || (ep->b_flags & B_INVAL) ||
114 if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL, NULL))
116 if (vp != ip->i_devvp)
118 /* look for overlap */
119 if (ep->b_bcount == 0 || ep->b_blkno > last ||
120 ep->b_blkno + btodb(ep->b_bcount) <= start)
122 vprint("Disk overlap", vp);
123 (void)printf("\tstart %d, end %d overlap start %d, end %d\n",
124 start, last, ep->b_blkno,
125 ep->b_blkno + btodb(ep->b_bcount) - 1);
126 panic("Disk buffer overlap");