From owner-freebsd-bugs  Mon Aug 19 15: 0:16 2002
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Date: Mon, 19 Aug 2002 15:00:10 -0700 (PDT)
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From: Bruce Evans <bde@zeta.org.au>
Subject: Re: misc/41792: lseek after ftruncate fails
Reply-To: Bruce Evans <bde@zeta.org.au>
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The following reply was made to PR misc/41792; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: Yury Izrailevsky <izrailev@yahoo.com>
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: misc/41792: lseek after ftruncate fails
Date: Tue, 20 Aug 2002 07:58:51 +1000 (EST)

 On Mon, 19 Aug 2002, Yury Izrailevsky wrote:
 
 > >Description:
 >       File operation problem. Running the following:
 >
 > write(fd, buffer, 8K);
 > ftruncate(fd, 0);
 > write(fd, buffer, 1);
 > off = lseek(fd, 0, SEEK_END);
 > printf("%d", off);
 >
 > Output: 24576, expected: 1.
 >
 > The size of the actual file is 1 (if you ls -l on it). However, lseek goes way past it...
 >
 > Noticed this while running connectathon rewind test (part of special test suite). But fails even if don't go over NFS but just run on the local file system.
 >
 > I suspect the problem is with the FS cache. Or perhaps lseek and/or ftruncate are just broken...
 
 This only fails over nfs under -current.  stat(2) and thus ls(1) shows that
 the file size is 24576 until the next read(2) of the file.  Then the size
 becomes 1.
 
 Bruce
 

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