linux-kernel - Re: [PATCH 3/3] btrfs: set FS_SUPPORTS_SEEK

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Message-ID: <alpine.LSU.2.11.1504210319440.1535@eggly.anvils>
Date:	Tue, 21 Apr 2015 03:23:42 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	NeilBrown <neilb@...e.de>
cc:	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.cz>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 3/3] btrfs: set FS_SUPPORTS_SEEK_HOLE flag.

On Tue, 21 Apr 2015, Christoph Hellwig wrote:
> On Mon, Apr 20, 2015 at 01:58:35PM +0100, Al Viro wrote:
> > > > Do ext4 and xfs support this, do you know?
> > > 
> > > Yes.  As do f2fs, ocfs2, gfs2, ceph and NFSv4.2
> > 
> > Er...  Nominally, gfs2 supports it.  By treating all files as "there's a
> > hole starting at EOF".  Same as ext2 or even minix...
> 
> Yeah remove gfs2 from the list.

But please add tmpfs to the list -
though I doubt you're interested in caching its files.

Hugh
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