ctime set by truncate even if NOCMTIME requested

Andreas Dilger adilger at clusterfs.com
Tue Sep 20 12:11:57 GMT 2005

On Sep 19, 2005  21:16 -0500, Steve French wrote:
> It does seem like
>    utime(filename, timeval)
> may be the only time we want to send time changes to the server but I am 
> not certain how risky such an approach  is even after scanning fs/open.c 
> to ignore time changes except when both ATIME/MTIME/CTIME are set at the 
> same time (as they are in sys_utime and do_utimes).   Most people 
> probably don't care if the server and client clocks are not too far off, 
> but it does affect performance (presumably even noticeable on something 
> like fsx test)

For Lustre (since we are patching the VFS anyways) we have added an
ATTR_CTIME_SET flag to distinguish whether the client has explicitly
set the ia_ctime field, or if it is an implicit update.

Cheers, Andreas
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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