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linux-next/fs/9p/vfs_addr.c
Alexey Dobriyan e8edc6e03a Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.

This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
   getting them indirectly

Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
   they don't need sched.h
b) sched.h stops being dependency for significant number of files:
   on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
   after patch it's only 3744 (-8.3%).

Cross-compile tested on

	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
	alpha alpha-up
	arm
	i386 i386-up i386-defconfig i386-allnoconfig
	ia64 ia64-up
	m68k
	mips
	parisc parisc-up
	powerpc powerpc-up
	s390 s390-up
	sparc sparc-up
	sparc64 sparc64-up
	um-x86_64
	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig

as well as my two usual configs.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 09:18:19 -07:00

110 lines
2.5 KiB
C

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