linux-kernel - Re: [RFC PATCH 1/2] fs: Add dirreadahead syscall and VFS hooks

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Message-ID: <20140731033156.GQ26465@dastard>
Date:	Thu, 31 Jul 2014 13:31:56 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Michael Kerrisk <mtk.manpages@...il.com>
Cc:	Abhi Das <adas@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	cluster-devel <cluster-devel@...hat.com>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH 1/2] fs: Add dirreadahead syscall and VFS hooks

On Tue, Jul 29, 2014 at 10:21:50AM +0200, Michael Kerrisk wrote:
> [CC+=linux-api]
> 
> On Fri, Jul 25, 2014 at 7:37 PM, Abhi Das <adas@...hat.com> wrote:
> > Also adds a void *opaque field to struct dir_context that can be
> > used by filesystems to temporarily store any context as this
> > struct gets passed around in the fs.

So the prototype is:

int dir_readahead(int fd, off64_t offset, unsigned int count);

Why do we need a new syscall for this?

$ man 2 readahead
....
ssize_t readahead(int fd, off64_t offset, size_t count);
....
	EINVAL fd does not refer to a file type to which readahead() can be applied.


Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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