2 * Copyright (c) 2000-2001 Christoph Hellwig.
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30 #ident "$Id: vxfs_subr.c,v 1.1.1.1 2005/04/11 02:50:46 jack Exp $"
33 * Veritas filesystem driver - shared subroutines.
36 #include <linux/kernel.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
40 #include "vxfs_kcompat.h"
41 #include "vxfs_extern.h"
44 static int vxfs_readpage(struct file *, struct page *);
45 static int vxfs_bmap(struct address_space *, long);
47 struct address_space_operations vxfs_aops = {
48 .readpage = vxfs_readpage,
50 .sync_page = block_sync_page,
55 * vxfs_get_page - read a page into memory.
56 * @ip: inode to read from
60 * vxfs_get_page reads the @n th page of @ip into the pagecache.
63 * The wanted page on success, else a NULL pointer.
66 vxfs_get_page(struct address_space *mapping, u_long n)
70 pp = read_cache_page(mapping, n,
71 (filler_t*)mapping->a_ops->readpage, NULL);
76 if (!Page_Uptodate(pp))
78 /** if (!PageChecked(pp)) **/
79 /** vxfs_check_page(pp); **/
92 vxfs_put_page(struct page *pp)
95 page_cache_release(pp);
99 * vxfs_bread - read buffer for a give inode,block tuple
101 * @block: logical block
104 * The vxfs_bread function reads block no @block of
105 * @ip into the buffercache.
108 * The resulting &struct buffer_head.
111 vxfs_bread(struct inode *ip, int block)
113 struct buffer_head *bp;
116 pblock = vxfs_bmap1(ip, block);
117 bp = sb_bread(ip->i_sb, pblock);
123 * vxfs_get_block - locate buffer for given inode,block tuple
125 * @iblock: logical block
126 * @bp: buffer skeleton
127 * @create: %TRUE if blocks may be newly allocated.
130 * The vxfs_get_block function fills @bp with the right physical
131 * block and device number to perform a lowlevel read/write on
135 * Zero on success, else a negativ error code (-EIO).
138 vxfs_getblk(struct inode *ip, sector_t iblock,
139 struct buffer_head *bp, int create)
143 pblock = vxfs_bmap1(ip, iblock);
145 map_bh(bp, ip->i_sb, pblock);
153 * vxfs_readpage - read one page synchronously into the pagecache
154 * @file: file context (unused)
155 * @page: page frame to fill in.
158 * The vxfs_readpage routine reads @page synchronously into the
162 * Zero on success, else a negative error code.
165 * @page is locked and will be unlocked.
168 vxfs_readpage(struct file *file, struct page *page)
170 return block_read_full_page(page, vxfs_getblk);
174 * vxfs_bmap - perform logical to physical block mapping
175 * @mapping: logical to physical mapping to use
176 * @block: logical block (relative to @mapping).
179 * Vxfs_bmap find out the corresponding phsical block to the
180 * @mapping, @block pair.
183 * Physical block number on success, else Zero.
186 * We are under the bkl.
189 vxfs_bmap(struct address_space *mapping, long block)
191 return generic_block_bmap(mapping, block, vxfs_getblk);