NFSv4: Fix handling of revoked delegations by setattr

Currently, _nfs4_do_setattr() will use the delegation stateid if no
writeable open file stateid is available.
If the server revokes that delegation stateid, then the call to
nfs4_handle_exception() will fail to handle the error due to the
lack of a struct nfs4_state, and will just convert the error into
an EIO.

This patch just removes the requirement that we must have a
struct nfs4_state in order to invalidate the delegation and
retry.

Reported-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 83197fb60d5f..af05df3c7c79 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -304,9 +304,13 @@ static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struc
                 case -NFS4ERR_DELEG_REVOKED:
                 case -NFS4ERR_ADMIN_REVOKED:
                 case -NFS4ERR_BAD_STATEID:
+                        if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
+                                nfs_remove_bad_delegation(inode);
+                                exception->retry = 1;
+                                break;
+                        }
                         if (state == NULL)
                                 break;
-                        nfs_remove_bad_delegation(state->inode);
                         ret = nfs4_schedule_stateid_recovery(server, state);
                         if (ret < 0)
                                 break;