patch-2.4.5 linux/fs/freevxfs/vxfs_olt.c

• Lines: 124
• Date: Mon May 21 12:31:06 2001
• Orig file: v2.4.4/linux/fs/freevxfs/vxfs_olt.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/fs/freevxfs/vxfs_olt.c linux/fs/freevxfs/vxfs_olt.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * 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,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#ident "$Id: vxfs_olt.c,v 1.8 2001/04/25 18:11:23 hch Exp hch $"
+
+/* 
+ * Veritas filesystem driver - object location table support.
+ */
+#include <linux/fs.h>
+#include <linux/kernel.h>
+
+#include "vxfs.h"
+#include "vxfs_olt.h"
+
+
+static __inline__ void
+vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
+{
+	if (infp->vsi_fshino)
+		BUG();
+	infp->vsi_fshino = fshp->olt_fsino[0];
+}
+
+static __inline__ void
+vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
+{
+	if (infp->vsi_iext)
+		BUG();
+	infp->vsi_iext = ilistp->olt_iext[0]; 
+}
+
+static __inline__ u_long
+vxfs_oblock(daddr_t oblock, u_long bsize)
+{
+	if ((oblock * BLOCK_SIZE) % bsize)
+		BUG();
+	return ((oblock * BLOCK_SIZE) / bsize);
+}
+
+
+/**
+ * vxfs_read_olt - read olt
+ * @sbp:	superblock of the filesystem
+ * @bsize:	blocksize of the filesystem
+ *
+ * Description:
+ *   vxfs_read_olt reads the olt of the filesystem described by @sbp
+ *   into main memory and does some basic setup.
+ *
+ * Returns:
+ *   Zero on success, else a negative error code.
+ */
+int
+vxfs_read_olt(struct super_block *sbp, u_long bsize)
+{
+	struct vxfs_sb_info	*infp = VXFS_SBI(sbp);
+	struct buffer_head	*bp;
+	struct vxfs_olt		*op;
+	char			*oaddr, *eaddr;
+
+
+	bp = bread(sbp->s_dev, vxfs_oblock(infp->vsi_oltext, bsize), bsize);
+	if (!bp || !bp->b_data)
+		goto fail;
+
+	op = (struct vxfs_olt *)bp->b_data;
+	if (op->olt_magic != VXFS_OLT_MAGIC) {
+		printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
+		goto fail;
+	}
+
+	oaddr = (char *)bp->b_data + op->olt_size;
+	eaddr = (char *)bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
+
+	while (oaddr < eaddr) {
+		struct vxfs_oltcommon	*ocp =
+			(struct vxfs_oltcommon *)oaddr;
+		
+		switch (ocp->olt_type) {
+		case VXFS_OLT_FSHEAD:
+			vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
+			break;
+		case VXFS_OLT_ILIST:
+			vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
+			break;
+		}
+
+		oaddr += ocp->olt_size;
+	}
+
+	brelse(bp);
+	return 0;
+
+fail:
+	brelse(bp);
+	return -EINVAL;
+}