2006-01-19 02:43:02 +01:00
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/*
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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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2006-03-25 12:07:28 +01:00
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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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2006-01-19 02:43:02 +01:00
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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/inet.h>
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#include <linux/pagemap.h>
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#include <linux/idr.h>
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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>
2007-05-20 23:22:52 +02:00
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#include <linux/sched.h>
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2007-07-11 00:57:28 +02:00
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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2006-01-19 02:43:02 +01:00
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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2009-09-23 20:00:27 +02:00
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#include "cache.h"
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2006-01-19 02:43:02 +01:00
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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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2008-03-05 14:08:09 +01:00
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* @filp: file being read
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2006-01-19 02:43:02 +01:00
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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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2007-07-11 00:57:28 +02:00
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int retval;
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loff_t offset;
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char *buffer;
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2009-09-23 20:00:27 +02:00
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struct inode *inode;
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2007-02-11 20:21:39 +01:00
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2009-09-23 20:00:27 +02:00
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inode = page->mapping->host;
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2007-07-11 00:57:28 +02:00
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P9_DPRINTK(P9_DEBUG_VFS, "\n");
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2009-09-23 20:00:27 +02:00
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BUG_ON(!PageLocked(page));
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retval = v9fs_readpage_from_fscache(inode, page);
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if (retval == 0)
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return retval;
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2006-01-19 02:43:02 +01:00
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buffer = kmap(page);
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2007-07-11 00:57:28 +02:00
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offset = page_offset(page);
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2006-01-19 02:43:02 +01:00
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2009-07-14 20:26:52 +02:00
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retval = v9fs_file_readn(filp, buffer, NULL, PAGE_CACHE_SIZE, offset);
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2009-09-23 20:00:27 +02:00
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if (retval < 0) {
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v9fs_uncache_page(inode, page);
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2007-07-11 00:57:28 +02:00
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goto done;
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2009-09-23 20:00:27 +02:00
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}
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2006-01-19 02:43:02 +01:00
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2007-07-11 00:57:28 +02:00
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memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
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2006-01-19 02:43:02 +01:00
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flush_dcache_page(page);
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SetPageUptodate(page);
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2009-09-23 20:00:27 +02:00
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v9fs_readpage_to_fscache(inode, page);
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2006-01-19 02:43:02 +01:00
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retval = 0;
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2007-07-11 00:57:28 +02:00
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done:
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2006-01-19 02:43:02 +01:00
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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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2009-09-23 20:00:27 +02:00
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/**
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* v9fs_vfs_readpages - read a set of pages from 9P
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*
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* @filp: file being read
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* @mapping: the address space
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* @pages: list of pages to read
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* @nr_pages: count of pages to read
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*
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*/
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static int v9fs_vfs_readpages(struct file *filp, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages)
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{
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int ret = 0;
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struct inode *inode;
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inode = mapping->host;
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P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, filp);
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ret = v9fs_readpages_from_fscache(inode, mapping, pages, &nr_pages);
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if (ret == 0)
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return ret;
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ret = read_cache_pages(mapping, pages, (void *)v9fs_vfs_readpage, filp);
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P9_DPRINTK(P9_DEBUG_VFS, " = %d\n", ret);
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return ret;
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}
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/**
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* v9fs_release_page - release the private state associated with a page
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*
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* Returns 1 if the page can be released, false otherwise.
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*/
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static int v9fs_release_page(struct page *page, gfp_t gfp)
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{
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if (PagePrivate(page))
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return 0;
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return v9fs_fscache_release_page(page, gfp);
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}
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/**
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* v9fs_invalidate_page - Invalidate a page completely or partially
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*
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* @page: structure to page
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* @offset: offset in the page
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*/
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static void v9fs_invalidate_page(struct page *page, unsigned long offset)
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{
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if (offset == 0)
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v9fs_fscache_invalidate_page(page);
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}
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/**
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* v9fs_launder_page - Writeback a dirty page
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* Since the writes go directly to the server, we simply return a 0
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* here to indicate success.
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*
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* Returns 0 on success.
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*/
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static int v9fs_launder_page(struct page *page)
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{
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2011-02-28 12:33:56 +01:00
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struct inode *inode = page->mapping->host;
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v9fs_fscache_wait_on_page_write(inode, page);
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2009-09-23 20:00:27 +02:00
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return 0;
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}
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2010-08-24 17:43:28 +02:00
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/**
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* v9fs_direct_IO - 9P address space operation for direct I/O
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* @rw: direction (read or write)
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* @iocb: target I/O control block
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* @iov: array of vectors that define I/O buffer
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* @pos: offset in file to begin the operation
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* @nr_segs: size of iovec array
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*
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* The presence of v9fs_direct_IO() in the address space ops vector
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* allowes open() O_DIRECT flags which would have failed otherwise.
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*
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* In the non-cached mode, we shunt off direct read and write requests before
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* the VFS gets them, so this method should never be called.
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*
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* Direct IO is not 'yet' supported in the cached mode. Hence when
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* this routine is called through generic_file_aio_read(), the read/write fails
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* with an error.
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*
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*/
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ssize_t v9fs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
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loff_t pos, unsigned long nr_segs)
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{
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P9_DPRINTK(P9_DEBUG_VFS, "v9fs_direct_IO: v9fs_direct_IO (%s) "
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"off/no(%lld/%lu) EINVAL\n",
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iocb->ki_filp->f_path.dentry->d_name.name,
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(long long) pos, nr_segs);
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return -EINVAL;
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}
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2006-06-28 13:26:44 +02:00
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const struct address_space_operations v9fs_addr_operations = {
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2006-01-19 02:43:02 +01:00
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.readpage = v9fs_vfs_readpage,
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2009-09-23 20:00:27 +02:00
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.readpages = v9fs_vfs_readpages,
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.releasepage = v9fs_release_page,
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.invalidatepage = v9fs_invalidate_page,
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.launder_page = v9fs_launder_page,
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2010-08-24 17:43:28 +02:00
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.direct_IO = v9fs_direct_IO,
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2006-01-19 02:43:02 +01:00
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};
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