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Message-ID: <571E47C8.5010805@sandisk.com>
Date: Mon, 25 Apr 2016 09:37:28 -0700
From: Bart Van Assche <bart.vanassche@...disk.com>
To: Philipp Reisner <philipp.reisner@...bit.com>,
Jens Axboe <axboe@...com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Lars Ellenberg <lars.ellenberg@...bit.com>,
"drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>
Subject: Re: [Drbd-dev] [PATCH 11/30] drbd: when receiving P_TRIM, zero-out
partial unaligned chunks
On 04/25/2016 05:13 AM, Philipp Reisner wrote:
> + while (nr_sectors >= granularity) {
> + nr = min_t(sector_t, nr_sectors, max_discard_sectors);
> + err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO, 0);
> + nr_sectors -= nr;
> + start += nr;
> + }
Hello Phil,
In blk_bio_discard_split() the following statement protects against
block drivers for which max_discard_sectors is not a multiple of the
discard granularity:
max_discard_sectors -= max_discard_sectors % granularity;
Do we need something similar in the above loop?
To Jens: should the drbd_issue_discard_or_zero_out() function go
upstream or should rather what this function does be integrated in
blkdev_issue_zeroout() as is done by the patch series "[PATCH v2 0/6]
Make blkdev_issue_discard() submit aligned discard requests"
(http://thread.gmane.org/gmane.linux.kernel.device-mapper.devel/23801)?
Thanks,
Bart.
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