Date: Fri, 10 Dec 2010 16:37:16 +0200 From: Andriy Gapon <avg@freebsd.org> To: Lev Serebryakov <lev@serebryakov.spb.ru> Cc: freebsd-geom@freebsd.org Subject: Re: struct bio: mark as complete, but keep data buffer (and protect it from freeing/using)? Message-ID: <4D023B1C.3070707@freebsd.org> In-Reply-To: <166474821.20101209220023@serebryakov.spb.ru> References: <166474821.20101209220023@serebryakov.spb.ru>
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on 09/12/2010 21:00 Lev Serebryakov said the following: > Hello, Freebsd-geom. > > Is it possible to mark "struct bio" as complete (pass to > g_io_deliver()) but hold its data buffer, to avoid unnecessary data > copy? What do you mean by 'hold'? Store bio_data pointer locally? I think that that greatly depends on what owner of that bio is going to do with it after the operation completes. E.g. if it frees that memory then the pointer would become stale. So, in general case, it would probably be not a good idea. -- Andriy Gapon
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