linux-ext4 - Re: [PATCH 09/18] xstat: Make special system filesystems return FS_SPECIAL

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Date:	Tue, 27 Jul 2010 14:41:24 +0100
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dhowells@...hat.com, Christoph Hellwig <hch@...radead.org>,
	viro@...IV.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 09/18] xstat: Make special system filesystems return FS_SPECIAL_FL [ver #6]

David Howells <dhowells@...hat.com> wrote:

> Also, not all the flags are per-filesystem.  The following are:
> 
> 	FS_SPECIAL_FL		/* Special file as found in procfs/sysfs */
> 	FS_REMOTE_FL		/* File is remote */

Actually, that last is not true; FS_REMOTE_FL is per-file, not per-fs.  You
can have a filesystem that has fabricated files and remote files.  For
instance, with kAFS at some point you will be go into /afs, do a lookup for a
directory that doesn't exist, but whose name represents a cell+volume, the
filesystem will fabricate a local directory and then attempt to mount a remote
directory on to it.

David
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