Actually, as far as Coda is concerned this only adds overhead. Coda uses
AFS2 session semantics instead of UNIX semantics, so updates are only
propagated when a file is closed.
Adding this to the generic_file_llseek will force an useless but
expensive upcall (and RPC call to the server) to every seek to check for
an updated i_size while we already know that the i_size of the file
won't have to change until it is closed and reopened.
I guess we're just (mis-)using the revalidate call as a replacement of a
missing call to i_ops->getattr from sys_stat. So perhaps adding the
revalidate to the generic_llseek is fine, but I'll just have to get that
missing getattr call into the tree.
Jan
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