From: Christoph Hellwig <hch@lst.de>
To: anton.ivanov@cambridgegreys.com
Cc: axboe@kernel.dk, richard@nod.at, linux-um@lists.infradead.org,
hch@lst.de
Subject: Re: [PATCH 4/4] um: Add support for DISCARD in the UBD Driver
Date: Wed, 14 Nov 2018 16:30:28 +0100 [thread overview]
Message-ID: <20181114153028.GB28557@lst.de> (raw)
In-Reply-To: <20181113115947.19290-5-anton.ivanov@cambridgegreys.com>
Discards are defined to be hints. So if your fileystems return
-EOPTNOTSUPP you just stop passing them to the file system and
complete them from ->queue_rq.
Write Zeroes isn't. So if you really want to support it you
should manually write zeroes to the file as a fallback. But do you
have a real use case for Write Zeroes to start with?
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next prev parent reply other threads:[~2018-11-14 15:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-13 11:59 Revised and fixed patchset anton.ivanov
2018-11-13 11:59 ` [PATCH 1/4] um: Switch to block-mq constants in the UML UBD driver anton.ivanov
2018-11-13 13:33 ` Jens Axboe
2018-11-14 15:32 ` Christoph Hellwig
2018-11-14 17:00 ` Jens Axboe
2018-11-14 17:04 ` Anton Ivanov
2018-11-13 11:59 ` [PATCH 2/4] um: Clean-up command processing in " anton.ivanov
2018-11-13 13:34 ` Jens Axboe
2018-11-14 15:28 ` Christoph Hellwig
2018-11-14 15:31 ` Anton Ivanov
2018-11-14 15:33 ` Christoph Hellwig
2018-11-13 11:59 ` [PATCH 3/4] um: Remove unsafe printks from the io thread anton.ivanov
2018-11-13 13:31 ` Jens Axboe
2018-11-13 11:59 ` [PATCH 4/4] um: Add support for DISCARD in the UBD Driver anton.ivanov
2018-11-13 13:40 ` Jens Axboe
2018-11-13 14:04 ` Anton Ivanov
2018-11-13 15:18 ` Jens Axboe
2018-11-13 15:32 ` Anton Ivanov
2018-11-13 15:49 ` Jens Axboe
2018-11-13 15:52 ` Anton Ivanov
2018-11-14 15:30 ` Christoph Hellwig [this message]
2018-11-14 15:35 ` Anton Ivanov
-- strict thread matches above, loose matches on Subject: below --
2018-11-14 8:10 [PATCH 1/4] um: Switch to block-mq constants in the UML UBD driver anton.ivanov
2018-11-14 8:10 ` [PATCH 4/4] um: Add support for DISCARD in the UBD Driver anton.ivanov
2018-11-14 17:09 [PATCH 1/4] um: Switch to block-mq constants in the UML UBD driver anton.ivanov
2018-11-14 17:09 ` [PATCH 4/4] um: Add support for DISCARD in the UBD Driver anton.ivanov
2018-11-14 18:30 ` Anton Ivanov
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