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