[ccache] RE: [distcc] Fw: [NFS] nfs/mmap/rename file corruption
Gavrie Philipson
gavrie at disksites.com
Thu Aug 28 17:35:14 EST 2003
Hi Martin,
Fantastic -- it solved my problem with the corrupted object files.
Since the exports(5) manpage recommends using no_subtree_check for
rapidly changing filesystems anyway, this is not such a bad solution.
Thanks,
-- Gavrie
.
> -----Original Message-----
> From: Martin Pool [mailto:mbp at sourcefrog.net]
> Sent: Thursday, August 28, 2003 5:18
> To: distcc at lists.samba.org; ccache at lists.samba.org
> Subject: [distcc] Fw: [NFS] nfs/mmap/rename file corruption
>
>
> 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 <trond.myklebust at fys.uio.no>
> To: Martin Pool <mbp at sourcefrog.net>
> Cc: nfs at lists.sourceforge.net
> Subject: Re: [NFS] nfs/mmap/rename file corruption
>
>
> >>>>> " " == Martin Pool <mbp at sourcefrog.net> 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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