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Groups > linux.kernel > #1362913

Re: [PATCH 3/6] block: add ability to flag write back caching on a device

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 3/6] block: add ability to flag write back caching on a device
Date 2016-03-22 20:00 +0100
Message-ID <rfzH4-h4-5@gated-at.bofh.it> (permalink)
References <rfyKZ-88A-3@gated-at.bofh.it> <rfyL0-88A-33@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Mar 22, 2016 at 11:55:17AM -0600, Jens Axboe wrote:
> Add an internal helper and flag for setting whether a queue has
> write back caching, or write through (or none). Add a sysfs file
> to show this as well, and make it changeable from user space.

We do this by passing the REQ_FLUSH flag to blk_queue_flush today.
While that's not a great interface, adding a second one doesn't make it
any better :)

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Thread

[PATCHSET][RFC] Make background writeback not suck Jens Axboe <axboe@fb.com> - 2016-03-22 19:00 +0100
  [PATCH 3/6] block: add ability to flag write back caching on a device Jens Axboe <axboe@fb.com> - 2016-03-22 19:00 +0100
    Re: [PATCH 3/6] block: add ability to flag write back caching on a  device Christoph Hellwig <hch@infradead.org> - 2016-03-22 20:00 +0100
      Re: [PATCH 3/6] block: add ability to flag write back caching on a  device Jens Axboe <axboe@fb.com> - 2016-03-22 20:10 +0100
  Re: [PATCHSET][RFC] Make background writeback not suck Dave Chinner <david@fromorbit.com> - 2016-03-22 23:00 +0100
    Re: [PATCHSET][RFC] Make background writeback not suck Jens Axboe <axboe@fb.com> - 2016-03-22 23:10 +0100
      Re: [PATCHSET][RFC] Make background writeback not suck Dave Chinner <david@fromorbit.com> - 2016-03-22 23:40 +0100
        Re: [PATCHSET][RFC] Make background writeback not suck Jens Axboe <axboe@fb.com> - 2016-03-23 00:00 +0100

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