Main code for the ext2fs filesystem. Please refer to the COPYRIGHT.INFO

file for GPL restrictions.  This code was ported to the BSD platform
by Godmar Back <gback@facility.cs.utah.edu> and specifically to FreeBSD
by John Dyson.  This code is still green and should be used with caution.
Additional changes to UFS necessary to make this code work will be commited
seperately.
Submitted by:	Godmar Back <gback@facility.cs.utah.edu>
Obtained from:	Lites/Mach4

1 files changed, 128 insertions, 0 deletions

diff --git a/sys/gnu/ext2fs/ext2_subr.c b/sys/gnu/ext2fs/ext2_subr.c
new file mode 100644
index 0000000..c27abe5
--- /dev/null
+++ b/sys/gnu/ext2fs/ext2_subr.c
@@ -0,0 +1,128 @@
+/*
+ *  modified for Lites 1.1
+ *
+ *  Aug 1995, Godmar Back (gback@cs.utah.edu)
+ *  University of Utah, Department of Computer Science
+ */
+/*
+ * Copyright (c) 1982, 1986, 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)ext2_subr.c	8.2 (Berkeley) 9/21/93
+ */
+
+#include <sys/param.h>
+#include <gnu/ext2fs/ext2_fs.h>
+#include <gnu/ext2fs/ext2_fs_sb.h>
+#include <gnu/ext2fs/fs.h>
+
+#include <sys/systm.h>
+#include <sys/vnode.h>
+#include <gnu/ext2fs/ext2_extern.h>
+#include <sys/buf.h>
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+
+/*
+ * Return buffer with the contents of block "offset" from the beginning of
+ * directory "ip".  If "res" is non-zero, fill it in with a pointer to the
+ * remaining space in the directory.
+ */
+int
+ext2_blkatoff(ap)
+	struct vop_blkatoff_args /* {
+		struct vnode *a_vp;
+		off_t a_offset;
+		char **a_res;
+		struct buf **a_bpp;
+	} */ *ap;
+{
+	struct inode *ip;
+	register struct ext2_sb_info *fs;
+	struct buf *bp;
+	daddr_t lbn;
+	int bsize, error;
+
+	ip = VTOI(ap->a_vp);
+	fs = ip->i_e2fs;
+	lbn = lblkno(fs, ap->a_offset);
+	bsize = blksize(fs, ip, lbn);
+
+	*ap->a_bpp = NULL;
+	if (error = bread(ap->a_vp, lbn, bsize, NOCRED, &bp)) {
+		brelse(bp);
+		return (error);
+	}
+	if (ap->a_res)
+		*ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
+	*ap->a_bpp = bp;
+	return (0);
+}
+
+#if defined(KERNEL) && defined(DIAGNOSTIC)
+void
+ext2_checkoverlap(bp, ip)
+	struct buf *bp;
+	struct inode *ip;
+{
+	register struct buf *ebp, *ep;
+	register daddr_t start, last;
+	struct vnode *vp;
+
+	ebp = &buf[nbuf];
+	start = bp->b_blkno;
+	last = start + btodb(bp->b_bcount) - 1;
+	for (ep = buf; ep < ebp; ep++) {
+		if (ep == bp || (ep->b_flags & B_INVAL) ||
+		    ep->b_vp == NULLVP)
+			continue;
+#if !defined(__FreeBSD__)
+		if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL))
+			continue;
+#else
+		if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL, NULL))
+			continue;
+#endif
+		if (vp != ip->i_devvp)
+			continue;
+		/* look for overlap */
+		if (ep->b_bcount == 0 || ep->b_blkno > last ||
+		    ep->b_blkno + btodb(ep->b_bcount) <= start)
+			continue;
+		vprint("Disk overlap", vp);
+		(void)printf("\tstart %d, end %d overlap start %d, end %d\n",
+			start, last, ep->b_blkno,
+			ep->b_blkno + btodb(ep->b_bcount) - 1);
+		panic("Disk buffer overlap");
+	}
+}
+#endif /* DIAGNOSTIC */
+