Date: Sun, 2 Oct 2005 16:40:34 +0100 From: Joao Barros <joao.barros@gmail.com> To: freebsd-hackers@freebsd.org Subject: Importing bio aka RAID Management Framework from OpenBSD Message-ID: <70e8236f0510020840s41fb5a93o20209f64409fd426@mail.gmail.com>
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Hi all,
I proposed to import bio aka RAID Management Framework from OpenBSD.
I have studied how bio is implemented in OpenBSD and here is a quick
resume of the 3 components that make bio:
- bio - ioctl tunnel pseudo-device
/dev/bio.c biovar.h
The bio driver provides userland applications ioctl access to devices
otherwise not found as /dev nodes. The /dev/bio device node operates =
by
delegating ioctl(2) calls to a requested device driver. Only drivers
which have registered with the bio device can be accessed via this int=
er-
face.
- ciss, amr - supported device drivers
- bioctl - RAID management interface
RAID device drivers which support management functionality can register
their services with the bio(4) driver. bioctl then can be used to mai=
n-
tain RAID volumes.
After analysing the structure of /src my initial idea was:
new /src/sys/contrib/dev/bio/bio.c biovar.h
new /src/sys/modules/bio/makefile
new /src/contrib/bio/bioctl.c
edit amr and ciss to register themselves on bio
1st: are these the correct places to be putting this files?
2nd: the drivers need to register to bio, this one being a kernel
module. If bio is not compiled in that can represent a problem. Ideas?
References:
Theo De Raadt initial presentation of bio:
http://marc.theaimsgroup.com/?l=3Dopenbsd-misc&m=3D112630095818062
bio manpage: http://www.openbsd.org/cgi-bin/man.cgi?query=3Dbio&sektion=3D4=
&arch=3Di386&apropos=3D0&manpath=3DOpenBSD+Current
bioctl manpage:
http://www.openbsd.org/cgi-bin/man.cgi?query=3Dbioctl&sektion=3D8&arch=3Di3=
86&apropos=3D0&manpath=3DOpenBSD+Current
--
Joao Barros
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