1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2000-2001 Christoph Hellwig.
7 * Veritas filesystem driver - shared subroutines.
10 #include <linux/buffer_head.h>
11 #include <linux/kernel.h>
12 #include <linux/pagemap.h>
14 #include "vxfs_extern.h"
17 static int vxfs_read_folio(struct file *, struct folio *);
18 static sector_t vxfs_bmap(struct address_space *, sector_t);
20 const struct address_space_operations vxfs_aops = {
21 .read_folio = vxfs_read_folio,
26 vxfs_put_page(struct page *pp)
33 * vxfs_get_page - read a page into memory.
34 * @ip: inode to read from
38 * vxfs_get_page reads the @n th page of @ip into the pagecache.
41 * The wanted page on success, else a NULL pointer.
44 vxfs_get_page(struct address_space *mapping, u_long n)
48 pp = read_mapping_page(mapping, n, NULL);
52 /** if (!PageChecked(pp)) **/
53 /** vxfs_check_page(pp); **/
66 * vxfs_bread - read buffer for a give inode,block tuple
68 * @block: logical block
71 * The vxfs_bread function reads block no @block of
72 * @ip into the buffercache.
75 * The resulting &struct buffer_head.
78 vxfs_bread(struct inode *ip, int block)
80 struct buffer_head *bp;
83 pblock = vxfs_bmap1(ip, block);
84 bp = sb_bread(ip->i_sb, pblock);
90 * vxfs_get_block - locate buffer for given inode,block tuple
92 * @iblock: logical block
93 * @bp: buffer skeleton
94 * @create: %TRUE if blocks may be newly allocated.
97 * The vxfs_get_block function fills @bp with the right physical
98 * block and device number to perform a lowlevel read/write on
102 * Zero on success, else a negativ error code (-EIO).
105 vxfs_getblk(struct inode *ip, sector_t iblock,
106 struct buffer_head *bp, int create)
110 pblock = vxfs_bmap1(ip, iblock);
112 map_bh(bp, ip->i_sb, pblock);
120 * vxfs_read_folio - read one page synchronously into the pagecache
121 * @file: file context (unused)
122 * @folio: folio to fill in.
125 * The vxfs_read_folio routine reads @folio synchronously into the
129 * Zero on success, else a negative error code.
132 * @folio is locked and will be unlocked.
134 static int vxfs_read_folio(struct file *file, struct folio *folio)
136 return block_read_full_folio(folio, vxfs_getblk);
140 * vxfs_bmap - perform logical to physical block mapping
141 * @mapping: logical to physical mapping to use
142 * @block: logical block (relative to @mapping).
145 * Vxfs_bmap find out the corresponding phsical block to the
146 * @mapping, @block pair.
149 * Physical block number on success, else Zero.
152 * We are under the bkl.
155 vxfs_bmap(struct address_space *mapping, sector_t block)
157 return generic_block_bmap(mapping, block, vxfs_getblk);