jfs: fix readdir cookie incompatibility with NFSv4
jfs: fix readdir cookie incompatibility with NFSv4

NFSv4 reserves readdir cookie values 0-2 for special entries (. and ..),
but jfs allows a value of 2 for a non-special entry. This incompatibility
can result in the nfs client reporting a readdir loop.

This patch doesn't change the value stored internally, but adds one to
the value exposed to the iterate method.

Signed-off-by: Dave Kleikamp <d1e82e2813f00e3d60e00aa92378ef41c34f031b@oracle.com>
Tested-by: Christian Kujau <da2ea5bee82302925a2874f529684e980c179d70@nerdbynature.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs