linux-kernel - Re: [PATCH 03/25] vfs: split __dentry

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Message-ID: <CAJfpegu8byHvPk3_KM3f1HE0dyaytVtsjZcUH5RB4pfwbQHEYA@mail.gmail.com>
Date:	Mon, 26 Mar 2012 15:22:09 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Trond.Myklebust@...app.com,
	sfrench@...ba.org, sage@...dream.net, ericvh@...il.com,
	mszeredi@...e.cz
Subject: Re: [PATCH 03/25] vfs: split __dentry_open()

On Sat, Mar 24, 2012 at 3:12 PM, Christoph Hellwig <hch@...radead.org> wrote:
> On Wed, Mar 07, 2012 at 10:22:20PM +0100, Miklos Szeredi wrote:
>> From: Miklos Szeredi <mszeredi@...e.cz>
>>
>> Split __dentry_open() into two functions:
>>
>>   do_dentry_open() - does most of the actual work, doesn't put file on failure
>>   open_check_o_direct() - after a successful open, checks direct_IO method
>>
>> This will allow i_op->atomic_open to do just the file initialization and leave
>> the direct_IO checking to the VFS.
>
> I think the O_DIRECT checks should move out of the VFS.  The direct I/O
> method isn't called from the VFS anywhere, but just from the
> generic_file_* routines in filemap.c, which suggest doing the O_DIRECT
> check in there as well.

Returning the error at the earliest opportunity (from open as opposed
to read/write) makes sense.  Given that some apps may actually rely on
the return value from open to verify O_DIRECT support, it doesn't seem
to be a good idea to move the checks to read/write.

Thanks,
Miklos
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