linux-kernel - Re: [patch 3/5] VFS: pass open file to ->xattr()

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Date:	Fri, 21 Sep 2007 12:44:00 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hch@...radead.org, trond.myklebust@....uio.no,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 3/5] VFS: pass open file to ->xattr()

On Sep 21, 2007  16:59 +0200, Miklos Szeredi wrote:
> What I'm saying is that read and write are _no_more_ related to the
> file than fstat.  Read/write operate on inode data, fstat operates on
> inode metadata.

The read and write operations are DEFINITELY related to the file descriptor
because of f_pos.  Each process opening the same file can have a different
f_pos so read/write will work in different locations of the file.

In contrast getattr and getxattr operate on the single inode and you don't
get e.g. a different i_size or i_uid or i_gid depending on who opened a
file, nor is the xattr different.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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