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-rw-r--r--fs/freevxfs/vxfs_subr.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_subr.c b/fs/freevxfs/vxfs_subr.c
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+++ b/fs/freevxfs/vxfs_subr.c
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+// 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);
+}