tree 4c6f0d852456581a7ca17286601d18d7bb030632
parent ed1e6211a0a134ff23592c6f057af982ad5dab52
author Trond Myklebust <Trond.Myklebust@netapp.com> 1312044335 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1312050890 -0400

NFS: Fix spurious readdir cookie loop messages

If the directory contents change, then we have to accept that the
file->f_pos value may shrink if we do a 'search-by-cookie'. In that
case, we should turn off the loop detection and let the NFS client
try to recover.

The patch also fixes a second loop detection bug by ensuring
that after turning on the ctx->duped flag, we read at least one new
cookie into ctx->dir_cookie before attempting to match with
ctx->dup_cookie.

Reported-by: Petr Vandrovec <petr@vandrovec.name>
Cc: stable@kernel.org [2.6.39+]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>