mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 14:43:03 +00:00
89488984ac
This will be turned back on once we can do allocation in ->page_mkwrite(). Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* mmap.c
|
|
*
|
|
* Code to deal with the mess that is clustered mmap.
|
|
*
|
|
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* 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 the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/rbtree.h>
|
|
|
|
#define MLOG_MASK_PREFIX ML_FILE_IO
|
|
#include <cluster/masklog.h>
|
|
|
|
#include "ocfs2.h"
|
|
|
|
#include "dlmglue.h"
|
|
#include "file.h"
|
|
#include "inode.h"
|
|
#include "mmap.h"
|
|
|
|
static struct page *ocfs2_nopage(struct vm_area_struct * area,
|
|
unsigned long address,
|
|
int *type)
|
|
{
|
|
struct page *page = NOPAGE_SIGBUS;
|
|
sigset_t blocked, oldset;
|
|
int ret;
|
|
|
|
mlog_entry("(area=%p, address=%lu, type=%p)\n", area, address,
|
|
type);
|
|
|
|
/* The best way to deal with signals in this path is
|
|
* to block them upfront, rather than allowing the
|
|
* locking paths to return -ERESTARTSYS. */
|
|
sigfillset(&blocked);
|
|
|
|
/* We should technically never get a bad ret return
|
|
* from sigprocmask */
|
|
ret = sigprocmask(SIG_BLOCK, &blocked, &oldset);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
page = filemap_nopage(area, address, type);
|
|
|
|
ret = sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
out:
|
|
mlog_exit_ptr(page);
|
|
return page;
|
|
}
|
|
|
|
static struct vm_operations_struct ocfs2_file_vm_ops = {
|
|
.nopage = ocfs2_nopage,
|
|
};
|
|
|
|
int ocfs2_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
int ret = 0, lock_level = 0;
|
|
struct ocfs2_super *osb = OCFS2_SB(file->f_dentry->d_inode->i_sb);
|
|
|
|
/*
|
|
* Only support shared writeable mmap for local mounts which
|
|
* don't know about holes.
|
|
*/
|
|
if ((!ocfs2_mount_local(osb) || ocfs2_sparse_alloc(osb)) &&
|
|
((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE)) &&
|
|
((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) {
|
|
mlog(0, "disallow shared writable mmaps %lx\n", vma->vm_flags);
|
|
/* This is -EINVAL because generic_file_readonly_mmap
|
|
* returns it in a similar situation. */
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = ocfs2_meta_lock_atime(file->f_dentry->d_inode,
|
|
file->f_vfsmnt, &lock_level);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
ocfs2_meta_unlock(file->f_dentry->d_inode, lock_level);
|
|
out:
|
|
vma->vm_ops = &ocfs2_file_vm_ops;
|
|
return 0;
|
|
}
|
|
|