From: Richard Miller <miller@hamnavoe.demon.co.uk>
To: 9fans@cse.psu.edu
Subject: [9fans] venti readahead error
Date: Sat, 17 Aug 2002 21:24:04 +0100 [thread overview]
Message-ID: <20020817202434.09C0F199B7@mail.cse.psu.edu> (raw)
When venti(8) reads a data block into the cache, it can initiate a
readahead which goes beyond the last allocated block in the
data arena. This does no direct harm, but results in a rather
alarming error message "clump has bad magic number=00000000", which
may cause unnecessary anxiety by suggesting that the venti store is
corrupted.
Here's a correction:
cpu% diff /sys/src/cmd/venti/lump.c lump.c
142a143,144
> if (aa >= arena->used)
> break;
-- Richard Miller
reply other threads:[~2002-08-17 20:24 UTC|newest]
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