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-rw-r--r--fs/freevxfs/vxfs_olt.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_olt.c b/fs/freevxfs/vxfs_olt.c
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+++ b/fs/freevxfs/vxfs_olt.c
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+/*
+ * 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.
+ */
+
+/*
+ * Veritas filesystem driver - object location table support.
+ */
+#include <linux/fs.h>
+#include <linux/buffer_head.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(struct super_block *sbp, daddr_t block, u_long bsize)
+{
+ if (sbp->s_blocksize % bsize)
+ BUG();
+ return (block * (sbp->s_blocksize / 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 = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, 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;
+ }
+
+ /*
+ * It is in theory possible that vsi_oltsize is > 1.
+ * I've not seen any such filesystem yet and I'm lazy.. --hch
+ */
+ if (infp->vsi_oltsize > 1) {
+ printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
+ printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\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;
+}