From: Kent Overstreet <kmo-PEzghdH756F8UrSeD/g0lQ@public.gmane.org>
To: sheng qiu <herbert1984106-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: reverse link from bucket to keys
Date: Mon, 8 Jul 2013 14:48:59 -0700 [thread overview]
Message-ID: <20130708214859.GB1959@kmo-pixel> (raw)
In-Reply-To: <CAB7xdikiVCeG=fJENSGY2K256CGOZrp=MYE8q6quSGX0h=ph9g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Mon, Jul 08, 2013 at 09:44:41AM -0400, sheng qiu wrote:
> Hi Kent,
>
> Thanks a lot for your reply.
>
> Then i have a question about the bucket invalidation. when bcache
> choose to replace a bucket, will the keys that reside on that bucket
> still be in the btree? since you do not have information about which
> keys reside on the bucket, how do you update the btree?
>
> i can think out two ways, one is you periodically scan the btree nodes
> and delete the stale nodes, the other way is when you get a cache hit
> on stale nodes, then you delete it at that moment. How bcache does
> this? Can you tell me the functions involve for these operations? i am
> interested in this part of codes.
This is documented in the code - start here:
http://evilpiepirate.org/git/linux-bcache.git/tree/drivers/md/bcache/bcache.h?h=bcache-dev
next prev parent reply other threads:[~2013-07-08 21:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-07 14:47 reverse link from bucket to keys sheng qiu
[not found] ` <CAB7xdi=zBrOfPH9PwCeu=wrguku5utMXJM1pQFiRa1GZU6xGEw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-07 16:24 ` Kent Overstreet
[not found] ` <CALJ65zk1kkUgOa4iqAFkA+64eU+6cEa=HRNQxZQ5SOwn4e5jAA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-08 13:44 ` sheng qiu
[not found] ` <CAB7xdikiVCeG=fJENSGY2K256CGOZrp=MYE8q6quSGX0h=ph9g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-08 21:48 ` Kent Overstreet [this message]
2013-07-09 15:24 ` sheng qiu
[not found] ` <CAB7xdinkyiE1Wp+K3=WyA7J1==G3t_coXoDn3wf_6ZvyUV+Vkg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-10 15:22 ` sheng qiu
[not found] ` <CAB7xdi=wn1O4+g8cynMpSrD114RVsXf4O6Jzz+cytcb=RZhHAg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-10 21:14 ` sheng qiu
[not found] ` <CAB7xdinPKr6orbY4Oc-CH-e5aeGwghLsiTFmFC4Qs80PwniBcg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-10 23:02 ` Kent Overstreet
2013-07-11 2:16 ` sheng qiu
[not found] ` <CAB7xdik_nDtJbz-YBaKkQ6XDVQT65ZiSB9E7WWZHon8jXH57SQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-11 13:45 ` sheng qiu
[not found] ` <CAB7xdikjXhAyM5dqVXuEUgL4RHM4L0uf0ksXZ_6uU3-ZgAKR4g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-11 15:02 ` sheng qiu
[not found] ` <CAB7xdinRH6ysM6O1x4jB00acqOvtRwPN00xjm2jkmvML37f3JQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-12 2:10 ` Kent Overstreet
2013-07-12 2:22 ` sheng qiu
[not found] ` <CAB7xdimtWj728xp9amk=K3-dnCWugFYLSUDuueHQwRYOP13dmw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-12 2:25 ` Kent Overstreet
2013-07-12 2:29 ` sheng qiu
[not found] ` <CAB7xdinz82AstkNTptXa2z3VFsAB4AT3NXf-Y0X7PZ+27k6iAw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-12 2:41 ` Kent Overstreet
2013-07-16 15:14 ` sheng qiu
[not found] ` <CAB7xdimAMQSovzRkBz47KwrVqDt1C4-d3iL6cBcrTGoqJ0dJNg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-16 20:59 ` Kent Overstreet
2013-07-17 22:28 ` sheng qiu
[not found] ` <CAB7xdim3d3Q7jM7+q8mwUVh6yCW1JQaM_xzWOnGHrkMxbS8EMA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-23 19:46 ` Kent Overstreet
2013-07-12 2:01 ` Kent Overstreet
2013-07-10 23:01 ` Kent Overstreet
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