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commit 3b816601e279756e781e6c4d9b3f3bd21a72ac67 upstream.
We have some reports of linux NFS clients that cannot satisfy a linux knfsd
server that always sets SEQ4_STATUS_RECALLABLE_STATE_REVOKED even though
those clients repeatedly walk all their known state using TEST_STATEID and
receive NFS4_OK for all.
Its possible for revoke_delegation() to set NFS4_REVOKED_DELEG_STID, then
nfsd4_free_stateid() finds the delegation and returns NFS4_OK to
FREE_STATEID. Afterward, revoke_delegation() moves the same delegation to
cl_revoked. This would produce the observed client/server effect.
Fix this by ensuring that the setting of sc_type to NFS4_REVOKED_DELEG_STID
and move to cl_revoked happens within the same cl_lock. This will allow
nfsd4_free_stateid() to properly remove the delegation from cl_revoked.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2217103
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2176575
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Cc: stable@vger.kernel.org # v4.17+
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
36c5aecc78