1 files changed, 105 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_olt.c b/fs/freevxfs/vxfs_olt.c
new file mode 100644
index 000000000..23f35187c
--- /dev/null
+++ b/fs/freevxfs/vxfs_olt.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ */
+
+/* 
+ * 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"
+#include "vxfs_extern.h"
+
+
+static inline void
+vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
+{
+	BUG_ON(infp->vsi_fshino);
+	infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]);
+}
+
+static inline void
+vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
+{
+	BUG_ON(infp->vsi_iext);
+	infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]);
+}
+
+static inline u_long
+vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
+{
+	BUG_ON(sbp->s_blocksize % bsize);
+	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 (fs32_to_cpu(infp, 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 = bp->b_data + fs32_to_cpu(infp, op->olt_size);
+	eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
+
+	while (oaddr < eaddr) {
+		struct vxfs_oltcommon	*ocp =
+			(struct vxfs_oltcommon *)oaddr;
+		
+		switch (fs32_to_cpu(infp, 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 += fs32_to_cpu(infp, ocp->olt_size);
+	}
+
+	brelse(bp);
+	return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL;
+
+fail:
+	brelse(bp);
+	return -EINVAL;
+}