In summary: to make ccache work safely on an NFS filesystem, the
filesystem must be exported with no_subtree_check. Otherwise data can
be lost when it renames recently-written files. :-(
----------------------
Begin forwarded message:
Date: 27 Aug 2003 21:37:38 -0400
From: Trond Myklebust <[EMAIL PROTECTED]>
To: Martin Pool <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Subject: Re: [NFS] nfs/mmap/rename file corruption
>>>>> " " == Martin Pool <[EMAIL PROTECTED]> writes:
> - ccache runs distcc with output to a temporary file
> - distcc opens, mmaps, writes to, munmaps, and closes the
temporary > file
> - distcc exits
> - ccache renames the temporary file to its proper location in
the > ccache
> - ccache opens the file read only, and reads from it
Is this a rename from one directory to the other? If so, are you using
the 'no_subtree_check' option on the server? Without the latter option
enabled, I would indeed expect the behaviour that you describe.
Cheers,
Trond
--
Martin
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