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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.
- * @ip: inode 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_get_block - 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_get_block 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);
- }
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