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

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Message-ID: <CA+55aFyY+oDoK8C6C++PG=N+vtY-r1Y6fYO_3skDTzkP_SXC-A@mail.gmail.com>
Date:	Fri, 4 Mar 2016 19:06:38 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>,
	"Theodore Ts'o" <tytso@....edu>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Linux API <linux-api@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	shane.seymour@....com, Bruce Fields <bfields@...ldses.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] block: implement (some of) fallocate for block devices

On Fri, Mar 4, 2016 at 4:56 PM, Darrick J. Wong <darrick.wong@...cle.com> wrote:
> +       /* Only punch if the device can do zeroing discard. */
> +       if ((mode & FALLOC_FL_PUNCH_HOLE) &&
> +           (!blk_queue_discard(q) || !q->limits.discard_zeroes_data))
> +               return -EOPNOTSUPP;

I'm ok with this, but suspect that some users would prefer to just
turn this into ZERO_RANGE silently.

Comments from people who would be expected to use this?

            Linus