linux-ext4 - Re: [PATCH 0/6] Extended file stat system call

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Date:	Thu, 26 Apr 2012 15:25:58 +0100
From:	David Howells <dhowells@...hat.com>
To:	Steve French <smfrench@...il.com>
Cc:	dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-ext4@...r.kernel.org,
	wine-devel@...ehq.org, kfm-devel@....org, nautilus-list@...me.org,
	linux-api@...r.kernel.org, libc-alpha@...rceware.org
Subject: Re: [PATCH 0/6] Extended file stat system call

Steve French <smfrench@...il.com> wrote:

> Would it be better to make the stable vs volatile inode number an attribute
> of the volume  or something returned by the proposed xstat?

I'm not sure what you mean by a stable vs a volatile inode number.

> > Should things like the Windows Archive, Hidden and System bits be handled
> > through IOC flags, perhaps expanded to 64-bits?
> 
> Today I export these through an psuedo-xattr in cifs.ko, I am curious how
> NTFS and FAT export these on linux.

NTFS: Not at all.

FAT: The hidden bit causes the filename to get a dot prepended (and nothing
else is noted).

> > Autofs, ntfs, btrfs, ...
> 
> Given the overlap in optional attributes between the network
> protocol and local NTFS (and ReFS and to a lesser extent FAT)
> I would expect cifs.ko and the ntfs implementations
> info to map pretty closely.

Yep.  I wasn't going to do more filesystems till we'd finished arguing about
the basic arrangement of things in struct xstat.

> > Handle remote filesystems being offline and indicate this with
> > XSTAT_INFO_OFFLINE.
> 
> You already have support for an indicator for offline files (HSM),

HSM?

> would XSTAT_INFO_OFFLINE be intended for the case
> where the network session to the server is disconnected
> (and in which you case the application does not want to reconnect)?

Hmmm...  Interesting question.  Both NTFS and CIFS have an offline attribute
(which is where I originally got this from) - but should I have a separate
indicator to indicate the client can't access a server over a network
(ie. we've gone to disconnected operation on this file)?  E.g. should there be
a XSTAT_INFO_DISCONNECTED too?

David
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