1 files changed, 152 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_subr.c b/fs/freevxfs/vxfs_subr.c
new file mode 100644
index 0000000000..f439877ea6
--- /dev/null
+++ b/fs/freevxfs/vxfs_subr.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ */
+
+/*
+ * Veritas filesystem driver - shared subroutines.
+ */
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+
+#include "vxfs_extern.h"
+
+
+static int		vxfs_read_folio(struct file *, struct folio *);
+static sector_t		vxfs_bmap(struct address_space *, sector_t);
+
+const struct address_space_operations vxfs_aops = {
+	.read_folio =		vxfs_read_folio,
+	.bmap =			vxfs_bmap,
+};
+
+inline void
+vxfs_put_page(struct page *pp)
+{
+	kunmap(pp);
+	put_page(pp);
+}
+
+/**
+ * vxfs_get_page - read a page into memory.
+ * @mapping:	mapping to read from
+ * @n:		page number
+ *
+ * Description:
+ *   vxfs_get_page reads the @n th page of @ip into the pagecache.
+ *
+ * Returns:
+ *   The wanted page on success, else a NULL pointer.
+ */
+struct page *
+vxfs_get_page(struct address_space *mapping, u_long n)
+{
+	struct page *			pp;
+
+	pp = read_mapping_page(mapping, n, NULL);
+
+	if (!IS_ERR(pp)) {
+		kmap(pp);
+		/** if (!PageChecked(pp)) **/
+			/** vxfs_check_page(pp); **/
+	}
+	
+	return (pp);
+}
+
+/**
+ * vxfs_bread - read buffer for a give inode,block tuple
+ * @ip:		inode
+ * @block:	logical block
+ *
+ * Description:
+ *   The vxfs_bread function reads block no @block  of
+ *   @ip into the buffercache.
+ *
+ * Returns:
+ *   The resulting &struct buffer_head.
+ */
+struct buffer_head *
+vxfs_bread(struct inode *ip, int block)
+{
+	struct buffer_head	*bp;
+	daddr_t			pblock;
+
+	pblock = vxfs_bmap1(ip, block);
+	bp = sb_bread(ip->i_sb, pblock);
+
+	return (bp);
+}
+
+/**
+ * vxfs_getblk - locate buffer for given inode,block tuple
+ * @ip:		inode
+ * @iblock:	logical block
+ * @bp:		buffer skeleton
+ * @create:	%TRUE if blocks may be newly allocated.
+ *
+ * Description:
+ *   The vxfs_getblk function fills @bp with the right physical
+ *   block and device number to perform a lowlevel read/write on
+ *   it.
+ *
+ * Returns:
+ *   Zero on success, else a negativ error code (-EIO).
+ */
+static int
+vxfs_getblk(struct inode *ip, sector_t iblock,
+	    struct buffer_head *bp, int create)
+{
+	daddr_t			pblock;
+
+	pblock = vxfs_bmap1(ip, iblock);
+	if (pblock != 0) {
+		map_bh(bp, ip->i_sb, pblock);
+		return 0;
+	}
+
+	return -EIO;
+}
+
+/**
+ * vxfs_read_folio - read one page synchronously into the pagecache
+ * @file:	file context (unused)
+ * @folio:	folio to fill in.
+ *
+ * Description:
+ *   The vxfs_read_folio routine reads @folio synchronously into the
+ *   pagecache.
+ *
+ * Returns:
+ *   Zero on success, else a negative error code.
+ *
+ * Locking status:
+ *   @folio is locked and will be unlocked.
+ */
+static int vxfs_read_folio(struct file *file, struct folio *folio)
+{
+	return block_read_full_folio(folio, vxfs_getblk);
+}
+ 
+/**
+ * vxfs_bmap - perform logical to physical block mapping
+ * @mapping:	logical to physical mapping to use
+ * @block:	logical block (relative to @mapping).
+ *
+ * Description:
+ *   Vxfs_bmap find out the corresponding phsical block to the
+ *   @mapping, @block pair.
+ *
+ * Returns:
+ *   Physical block number on success, else Zero.
+ *
+ * Locking status:
+ *   We are under the bkl.
+ */
+static sector_t
+vxfs_bmap(struct address_space *mapping, sector_t block)
+{
+	return generic_block_bmap(mapping, block, vxfs_getblk);
+}