[linux-cifs-client] Polished patch to avoid data-loss

[Steven French]

With LookupCacheEnabled IIRC file size (or other inode metadata) for a
multiply open (for write) file is only out of date for at most 1 second -
which I believe is a reasonable compromise.   NFS allows their timeout for
revalidate to be configured.

Even locally for applications with multiple processes writing to the same
file there can be races between seek in one process and write.


Steve French
Senior Software Engineer
Linux Technology Center - IBM Austin
phone: 512-838-2294
email: sfrench at-sign us dot ibm dot com
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