mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 15:34:48 +08:00
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2000-2001 Christoph Hellwig.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL").
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Veritas filesystem driver - support for 'immed' inodes.
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
|
|
#include "vxfs.h"
|
|
#include "vxfs_extern.h"
|
|
#include "vxfs_inode.h"
|
|
|
|
|
|
static int vxfs_immed_readpage(struct file *, struct page *);
|
|
|
|
/*
|
|
* Address space operations for immed files and directories.
|
|
*/
|
|
const struct address_space_operations vxfs_immed_aops = {
|
|
.readpage = vxfs_immed_readpage,
|
|
};
|
|
|
|
/**
|
|
* vxfs_immed_readpage - read part of an immed inode into pagecache
|
|
* @file: file context (unused)
|
|
* @page: page frame to fill in.
|
|
*
|
|
* Description:
|
|
* vxfs_immed_readpage reads a part of the immed area of the
|
|
* file that hosts @pp into the pagecache.
|
|
*
|
|
* Returns:
|
|
* Zero on success, else a negative error code.
|
|
*
|
|
* Locking status:
|
|
* @page is locked and will be unlocked.
|
|
*/
|
|
static int
|
|
vxfs_immed_readpage(struct file *fp, struct page *pp)
|
|
{
|
|
struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
|
|
u_int64_t offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT;
|
|
caddr_t kaddr;
|
|
|
|
kaddr = kmap(pp);
|
|
memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
|
|
kunmap(pp);
|
|
|
|
flush_dcache_page(pp);
|
|
SetPageUptodate(pp);
|
|
unlock_page(pp);
|
|
|
|
return 0;
|
|
}
|