linux-kernel - Re: [rfc][patch 3/4] fs: new truncate sequence

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Date:	Mon, 13 Jul 2009 09:53:24 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	linux-fsdevel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [rfc][patch 3/4] fs: new truncate sequence

On Mon, Jul 13, 2009 at 08:59:17AM +0200, Nick Piggin wrote:
> Agreed, if it is a common sequence / requirement for filesystems
> then of course I will not object to a helper to make things clearer
> or share code.
> 
> I would like to see inode_setattr renamed into simple_setattr, and
> then also .setattr made mandatory, so I don't like to cut code out
> of inode_setattr which makes it unable to be the simple_setattr
> after the old truncate code is removed.

But inode_setattr isn't anything like simple_setattr.  Except for
the truncate special case it's really just a helper to copy values
into the inode.  It doesn't even even have the same prototype as
->setattr.

A simple_setattr would look like the following:

int simple_setattr(struct dentry *dentry, struct iattr *iattr)
{
	struct inode *inode = dentry->d_inode;
	int error;

	error = inode_change_ok(inode, iattr);
        if (error)
                return error;

	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
	    (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
		if (vfs_dq_transfer(inode, iattr))
			return -EDQUOT;
	}

	if (iattr->ia_valid & ATTR_ATTR_SIZE &&
	    iattr->ia_size !== i_size_read(inode) &&
	    inode->i_op->new_truncate) {
		error = simple_setsize(inode, attr->ia_size);
		if (error)
			return error;
	}

	return inode_setattr(inode, attr);
}

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