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Date:      Wed, 22 Mar 2000 04:50:03 -0800 (PST)
From:      Bruce Evans <bde@zeta.org.au>
To:        freebsd-bugs@FreeBSD.org
Subject:   Re: Re: bin/17405: one more fstat patch
Message-ID:  <200003221250.EAA49354@freefall.freebsd.org>

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The following reply was made to PR bin/17405; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: Peter Edwards <peter.edwards@openet-telecom.com>
Cc: freebsd-gnats-submit@FreeBSD.ORG, peter.edwards@ireland.com
Subject: Re: Re: bin/17405: one more fstat patch
Date: Wed, 22 Mar 2000 23:40:23 +1100 (EST)

 On Wed, 22 Mar 2000, Peter Edwards wrote:
 
 > Hi,
 > With getfname &ing 0xffff, and nfs_filestat() not doing it, you'll
 > never find the filesystem for an NFS inode. I guess I picked adding
 > one 0xffff rather than removing the rest, 'cause it seemed more likely
 > the single omission was in error rather than the two or three uses 
 > of 0xffff.
 
 Well, until about 6 months ago, the nfs fsid was
 makedev(128 + mtype, xxxfs_mntid) (see kern_conf.c:getnewfsid()), so
 nfs fsids were <= 0xffff in the usual case where there have been <= 256
 mount(2) calls for non-disk filesystems.
 
 > I suppose my bug is that the 0xffff is being applied inconsistently,
 > while the quoted PR's bug is that the 0xffff is incorrect :)
 > Is the 0xffff is some historical artifact, then?
 
 I think it is just a wrong fix for bogus sign extension caused by dev_t
 being (signed) short.
 
 Bruce
 
 


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