From: cinap_lenrek@felloff.net
To: 9fans@9fans.net
Subject: Re: [9fans] duppage
Date: Tue, 10 Jun 2014 16:06:24 +0200 [thread overview]
Message-ID: <7489e8dd7f2d225fec01b198419f89fe@felloff.net> (raw)
In-Reply-To: <8a74e4235d48b56ef9fd8eee42c95c74@brasstown.quanstro.net>
no. my attachimage() compares qid + mountid (which is unique) and
reattaches the passed in channel if image->c was nil. when
a porcess exits, the segments are released, decrementing ref of
the pages and the images. the image has an additional field pgref where
it counts the number of page references (that is, the number of
references minus the references from segments). in putimage(),
when image->ref == image->pgref, we know that all references
to our image are from the cache only and thats when we close the image
channel and set image->c to nil. once the image gets attached again,
image->c will be set again as mentioned above.
this is just to avoid holding the channel reference when the image
is only kept arround for the cache. so mounts will go away propery
and not wait until the image is reclaimed.
it will find the right image for the channel in any case. nothing
has changed in that regard.
--
cinap
next prev parent reply other threads:[~2014-06-10 14:06 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-08 14:53 erik quanstrom
2014-06-08 17:15 ` cinap_lenrek
2014-06-08 17:22 ` Charles Forsyth
2014-06-08 17:34 ` erik quanstrom
2014-06-08 17:50 ` Charles Forsyth
2014-06-08 17:53 ` erik quanstrom
2014-06-08 17:54 ` cinap_lenrek
2014-06-08 18:15 ` erik quanstrom
2014-06-08 18:37 ` Charles Forsyth
2014-06-09 8:23 ` Charles Forsyth
2014-06-09 13:21 ` erik quanstrom
2014-06-10 1:35 ` erik quanstrom
2014-06-10 3:53 ` cinap_lenrek
2014-06-10 12:58 ` erik quanstrom
2014-06-10 13:56 ` Steve Simon
2014-06-10 15:30 ` erik quanstrom
2014-06-10 14:06 ` cinap_lenrek [this message]
2014-06-11 18:04 ` erik quanstrom
2014-06-08 17:49 ` cinap_lenrek
-- strict thread matches above, loose matches on Subject: below --
2012-03-13 23:55 erik quanstrom
2012-02-25 3:29 cinap_lenrek
2012-02-25 20:09 ` Charles Forsyth
2012-02-26 4:13 ` erik quanstrom
2012-02-29 10:31 ` Richard Miller
2012-02-29 14:14 ` cinap_lenrek
2012-02-29 19:35 ` Richard Miller
2012-02-29 19:50 ` cinap_lenrek
2012-03-03 9:58 ` Richard Miller
2012-03-03 19:30 ` cinap_lenrek
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