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Re: [Xen-devel] building blktap as a module
| To: | Gerd Hoffmann <kraxel@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] building blktap as a module |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 16 Oct 2006 13:56:54 +0100 |
| Cc: | Andrew Warfield <Andrew.Warfield@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxxxx> |
| Delivery-date: | Mon, 16 Oct 2006 05:57:29 -0700 |
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| Thread-topic: | [Xen-devel] building blktap as a module |
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On 16/10/06 12:45, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote: >> 1. The one in blktap_release() - why? Standard semantics is for mmap >> regions to exist beyond the closing of the mapping device. Doesn't make much >> sense to do that here, but then again not really any need to explicitly >> disallow it (and add extra code to enforce). > > The linux kernel does call the drivers release() method when the last > reference is gone. If you call close() with mappings still being > active, then ->release() is _not_ called when you close the file handle > but when the last mapping is unmapped. Thus there is no point in trying > to handle active mappings there ;) I.e., they'll have been unmapped already? As you say, either way the zap is not needed... -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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