Exemple #1
0
/*
 * Write an mmapped page to the server.
 */
int
nfs_writepage(struct page *page)
{
	struct inode *inode = page->mapping->host;
	unsigned long end_index;
	unsigned offset = PAGE_CACHE_SIZE;
	int inode_referenced = 0;
	int err;

	/*
	 * Note: We need to ensure that we have a reference to the inode
	 *       if we are to do asynchronous writes. If not, waiting
	 *       in nfs_wait_on_request() may deadlock with clear_inode().
	 *
	 *       If igrab() fails here, then it is in any case safe to
	 *       call nfs_wb_page(), since there will be no pending writes.
	 */
	if (igrab(inode) != 0)
		inode_referenced = 1;
	end_index = inode->i_size >> PAGE_CACHE_SHIFT;

	/* Ensure we've flushed out any previous writes */
	nfs_wb_page(inode,page);

	/* easy case */
	if (page->index < end_index)
		goto do_it;
	/* things got complicated... */
	offset = inode->i_size & (PAGE_CACHE_SIZE-1);

	/* OK, are we completely out? */
	err = -EIO;
	if (page->index >= end_index+1 || !offset)
		goto out;
do_it:
	lock_kernel();
	if (NFS_SERVER(inode)->wsize >= PAGE_CACHE_SIZE && !IS_SYNC(inode) &&
			inode_referenced) {
		err = nfs_writepage_async(NULL, inode, page, 0, offset);
		if (err >= 0)
			err = 0;
	} else {
		err = nfs_writepage_sync(NULL, inode, page, 0, offset); 
		if (err == offset)
			err = 0;
	}
	unlock_kernel();
out:
	UnlockPage(page);
	if (inode_referenced)
		iput(inode);
	return err;
}
Exemple #2
0
/*
 * Write an mmapped page to the server.
 */
int
nfs_writepage(struct page *page)
{
	struct inode *inode;
	unsigned long end_index;
	unsigned offset = PAGE_CACHE_SIZE;
	int err;
	struct address_space *mapping = page->mapping;

	if (!mapping)
		BUG();
	inode = mapping->host;
	if (!inode)
		BUG();
	end_index = inode->i_size >> PAGE_CACHE_SHIFT;

	/* Ensure we've flushed out any previous writes */
	nfs_wb_page(inode,page);

	/* easy case */
	if (page->index < end_index)
		goto do_it;
	/* things got complicated... */
	offset = inode->i_size & (PAGE_CACHE_SIZE-1);

	/* OK, are we completely out? */
	err = -EIO;
	if (page->index >= end_index+1 || !offset)
		goto out;
do_it:
	lock_kernel();
	if (NFS_SERVER(inode)->wsize >= PAGE_CACHE_SIZE && !IS_SYNC(inode)) {
		err = nfs_writepage_async(NULL, inode, page, 0, offset);
		if (err >= 0)
			err = 0;
	} else {
		err = nfs_writepage_sync(NULL, inode, page, 0, offset); 
		if (err == offset)
			err = 0;
	}
	unlock_kernel();
out:
	UnlockPage(page);
	return err; 
}