linux-kernel - Re: [PATCH 3/3] block: implement (some of) fallocate for block devices

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Date:	Mon, 21 Mar 2016 11:17:26 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	Christoph Hellwig <hch@...radead.org>, axboe@...nel.dk,
	torvalds@...ux-foundation.org, bfields@...ldses.org, tytso@....edu,
	martin.petersen@...cle.com, linux-api@...r.kernel.org,
	david@...morbit.com, linux-kernel@...r.kernel.org,
	shane.seymour@....com, linux-fsdevel@...r.kernel.org,
	jlayton@...chiereds.net, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/3] block: implement (some of) fallocate for block
 devices

On Mon, Mar 21, 2016 at 10:52:35AM -0700, Darrick J. Wong wrote:
> > I don't really understand the comment.  But I think you'd be much
> 
> I don't know of a block device primitive that corresponds to the "default"
> mode of fallocate, as documented in the manpage (i.e. mode == 0).  I agree
> that the whole thing could be simplified in the manner you point out below.

SCSI allows 'anchoring' blocks, which is pretty similar to a normal
fallocate, but we don't support anchoring blocks in Linux yet.