108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* linux/fs/9p/vfs_addr.c
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*
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* This file contians vfs address (mmap) ops for 9P2000.
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*
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* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <linux/inet.h>
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#include <linux/pagemap.h>
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#include <linux/idr.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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/**
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* v9fs_vfs_readpage - read an entire page in from 9P
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*
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* @file: file being read
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* @page: structure to page
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*
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*/
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static int v9fs_vfs_readpage(struct file *filp, struct page *page)
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{
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char *buffer = NULL;
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int retval = -EIO;
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loff_t offset = page_offset(page);
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int count = PAGE_CACHE_SIZE;
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struct inode *inode = filp->f_dentry->d_inode;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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int rsize = v9ses->maxdata - V9FS_IOHDRSZ;
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struct v9fs_fid *v9f = filp->private_data;
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struct v9fs_fcall *fcall = NULL;
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int fid = v9f->fid;
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int total = 0;
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int result = 0;
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buffer = kmap(page);
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do {
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if (count < rsize)
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rsize = count;
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result = v9fs_t_read(v9ses, fid, offset, rsize, &fcall);
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if (result < 0) {
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printk(KERN_ERR "v9fs_t_read returned %d\n",
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result);
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kfree(fcall);
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goto UnmapAndUnlock;
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} else
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offset += result;
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memcpy(buffer, fcall->params.rread.data, result);
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count -= result;
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buffer += result;
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total += result;
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kfree(fcall);
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if (result < rsize)
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break;
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} while (count);
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memset(buffer, 0, count);
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flush_dcache_page(page);
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SetPageUptodate(page);
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retval = 0;
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UnmapAndUnlock:
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kunmap(page);
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unlock_page(page);
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return retval;
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}
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const struct address_space_operations v9fs_addr_operations = {
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.readpage = v9fs_vfs_readpage,
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};
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