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From: dan@hrc.UUCP (Dan Troxel VP)
Newsgroups: comp.unix.wizards,comp.lang.c
Subject: Fs* in /usr/include/sys/param.h
Keywords: what is (dev) in FsTYPE=3
Message-ID: <374@hrc.UUCP>
Date: 14 Dec 88 02:11:03 GMT
Organization: Handwriting Research Corp. - Phoenix, AZ
Lines: 27


On a Convergent S/640 box,(basic USG config), param.h uses several
Fs defines. One is what size are the logical blocks on your system.
When FsTYPE is set to 3, it allows a system to have a combination of
512,1024,2048 logical block sizes. But with that, you have to give it
a device. Here is part of that file:

#if FsTYPE==3
	/* Dual system */
#define	BSIZE	512		/* size of file system block (bytes) */
#define	SBUFSIZE	(BSIZE*2)	/* system buffer size */
#define	BSHIFT	9		/* LOG2(BSIZE) */
#define	NINDIR	(BSIZE/sizeof(daddr_t))
#define	Fs2BLK	0x2000
#define	FsLRG(dev)	(dev&Fs2BLK)
#define	FsBSIZE(dev)	(FsLRG(dev) ? (BSIZE*2) : BSIZE)
#define	FsBSHIFT(dev)	(FsLRG(dev) ? 10 : 9)
#define	FsNINDIR(dev)	(FsLRG(dev) ? 256 : 128)
/*** lots of code deleted ***/
#endif

Normally, you when send a stucture of filsys, but on FsTYPE=3, it expects
a device, not a stucture. What do I use for the dev????
-- 
Dan Troxel VP of Computer Operations @ 
Handwriting Research Corporation - 2821 E. Camelback Road Suite 600
Phoenix, AZ  85016       WK 1-602-957-8870        HM 1-602-435-1240
UUCP : asuvax!hrc!dan