2005-12-15 17:31:24 -05:00
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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* mmap.c
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*
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* Code to deal with the mess that is clustered mmap.
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/uio.h>
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#include <linux/signal.h>
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#include <linux/rbtree.h>
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#define MLOG_MASK_PREFIX ML_FILE_IO
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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2007-05-09 18:16:19 -04:00
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#include "aops.h"
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2005-12-15 17:31:24 -05:00
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#include "dlmglue.h"
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#include "file.h"
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#include "inode.h"
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#include "mmap.h"
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2007-05-09 18:16:19 -04:00
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static inline int ocfs2_vm_op_block_sigs(sigset_t *blocked, sigset_t *oldset)
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{
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/* The best way to deal with signals in the vm path is
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* to block them upfront, rather than allowing the
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* locking paths to return -ERESTARTSYS. */
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sigfillset(blocked);
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/* We should technically never get a bad return value
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* from sigprocmask */
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return sigprocmask(SIG_BLOCK, blocked, oldset);
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}
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static inline int ocfs2_vm_op_unblock_sigs(sigset_t *oldset)
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{
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return sigprocmask(SIG_SETMASK, oldset, NULL);
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}
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2005-12-15 17:31:24 -05:00
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static struct page *ocfs2_nopage(struct vm_area_struct * area,
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unsigned long address,
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int *type)
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{
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struct page *page = NOPAGE_SIGBUS;
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sigset_t blocked, oldset;
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int ret;
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2006-05-10 21:28:59 -04:00
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mlog_entry("(area=%p, address=%lu, type=%p)\n", area, address,
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type);
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2005-12-15 17:31:24 -05:00
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2007-05-09 18:16:19 -04:00
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ret = ocfs2_vm_op_block_sigs(&blocked, &oldset);
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2005-12-15 17:31:24 -05:00
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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page = filemap_nopage(area, address, type);
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2007-05-09 18:16:19 -04:00
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ret = ocfs2_vm_op_unblock_sigs(&oldset);
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2005-12-15 17:31:24 -05:00
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if (ret < 0)
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mlog_errno(ret);
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out:
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mlog_exit_ptr(page);
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return page;
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}
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2007-05-09 18:16:19 -04:00
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static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh,
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struct page *page)
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{
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int ret;
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struct address_space *mapping = inode->i_mapping;
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loff_t pos = page->index << PAGE_CACHE_SHIFT;
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unsigned int len = PAGE_CACHE_SIZE;
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pgoff_t last_index;
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struct page *locked_page = NULL;
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void *fsdata;
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loff_t size = i_size_read(inode);
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2005-12-15 17:31:24 -05:00
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2007-05-09 18:16:19 -04:00
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/*
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* Another node might have truncated while we were waiting on
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* cluster locks.
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*/
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last_index = size >> PAGE_CACHE_SHIFT;
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if (page->index > last_index) {
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ret = -EINVAL;
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goto out;
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}
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/*
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* The i_size check above doesn't catch the case where nodes
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* truncated and then re-extended the file. We'll re-check the
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* page mapping after taking the page lock inside of
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* ocfs2_write_begin_nolock().
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*/
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if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
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ret = -EINVAL;
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goto out;
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}
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/*
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* Call ocfs2_write_begin() and ocfs2_write_end() to take
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* advantage of the allocation code there. We pass a write
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* length of the whole page (chopped to i_size) to make sure
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* the whole thing is allocated.
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*
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* Since we know the page is up to date, we don't have to
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* worry about ocfs2_write_begin() skipping some buffer reads
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* because the "write" would invalidate their data.
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*/
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if (page->index == last_index)
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len = size & ~PAGE_CACHE_MASK;
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ret = ocfs2_write_begin_nolock(mapping, pos, len, 0, &locked_page,
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&fsdata, di_bh, page);
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if (ret) {
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if (ret != -ENOSPC)
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_write_end_nolock(mapping, pos, len, len, locked_page,
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fsdata);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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BUG_ON(ret != len);
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ret = 0;
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out:
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return ret;
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}
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static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
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2005-12-15 17:31:24 -05:00
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{
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2007-05-09 18:16:19 -04:00
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struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
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struct buffer_head *di_bh = NULL;
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sigset_t blocked, oldset;
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int ret, ret2;
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ret = ocfs2_vm_op_block_sigs(&blocked, &oldset);
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if (ret < 0) {
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mlog_errno(ret);
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return ret;
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}
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/*
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* The cluster locks taken will block a truncate from another
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* node. Taking the data lock will also ensure that we don't
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* attempt page truncation as part of a downconvert.
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*/
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ret = ocfs2_meta_lock(inode, &di_bh, 1);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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2006-11-15 02:49:02 -05:00
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2007-01-17 16:10:55 -05:00
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/*
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2007-05-09 18:16:19 -04:00
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* The alloc sem should be enough to serialize with
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* ocfs2_truncate_file() changing i_size as well as any thread
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* modifying the inode btree.
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2007-01-17 16:10:55 -05:00
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*/
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2007-05-09 18:16:19 -04:00
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down_write(&OCFS2_I(inode)->ip_alloc_sem);
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ret = ocfs2_data_lock(inode, 1);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_meta_unlock;
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2005-12-15 17:31:24 -05:00
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}
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2007-05-09 18:16:19 -04:00
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ret = __ocfs2_page_mkwrite(inode, di_bh, page);
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ocfs2_data_unlock(inode, 1);
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out_meta_unlock:
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up_write(&OCFS2_I(inode)->ip_alloc_sem);
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brelse(di_bh);
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ocfs2_meta_unlock(inode, 1);
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out:
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ret2 = ocfs2_vm_op_unblock_sigs(&oldset);
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if (ret2 < 0)
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mlog_errno(ret2);
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return ret;
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}
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static struct vm_operations_struct ocfs2_file_vm_ops = {
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.nopage = ocfs2_nopage,
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.page_mkwrite = ocfs2_page_mkwrite,
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};
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int ocfs2_mmap(struct file *file, struct vm_area_struct *vma)
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{
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int ret = 0, lock_level = 0;
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2006-11-15 02:49:02 -05:00
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ret = ocfs2_meta_lock_atime(file->f_dentry->d_inode,
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file->f_vfsmnt, &lock_level);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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ocfs2_meta_unlock(file->f_dentry->d_inode, lock_level);
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out:
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2005-12-15 17:31:24 -05:00
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vma->vm_ops = &ocfs2_file_vm_ops;
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return 0;
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}
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