Date: Thu, 20 Dec 2012 11:49:18 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-arch@freebsd.org Subject: Re: Unmapped I/O Message-ID: <kauqfc$rau$1@ger.gmane.org> In-Reply-To: <20121219135451.GU71906@kib.kiev.ua> References: <20121219135451.GU71906@kib.kiev.ua>
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[-- Attachment #1 --] On 19/12/2012 14:54, Konstantin Belousov wrote: > Besides not mapped buffers, not mapped BIOs are introduced, marked > with the flag BIO_NOTMAPPED. Unmapped buffers are directly translated > to unmapped BIOs. Geom providers may indicate an acceptance of the > unmapped BIOs. If provider does not handle unmapped i/o requests, > geom now automatically establishes transient mapping for the i/o > pages. Hi, Can you write up more details on what this means for GEOM developers: what is to be gained / lost (on GEOM level) for existing GEOM classes, and how to "indicate acceptance" for umapped BIOs? [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlDS7S8ACgkQ/QjVBj3/HSyhmQCfSxnxOEfWaZTnx+IIgZ4sv+Ev fxUAnRIHLBgaSCtkZQdYMyRjrKEG9iK+ =QbNP -----END PGP SIGNATURE-----
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