nfsd4: do not throw away 4.1 lock state on last unlock

This reverts commit eb2099f31b0f090684a64ef8df44a30ff7c45fc2 "nfsd4:
release lockowners on last unlock in 4.1 case".  Trond identified
language in rfc 5661 section 8.2.4 which forbids this behavior:

	Stateids associated with byte-range locks are an exception.
	They remain valid even if a LOCKU frees all remaining locks, so
	long as the open file with which they are associated remains
	open, unless the client frees the stateids via the FREE_STATEID
	operation.

And bakeathon 2013 testing found a 4.1 freebsd client was getting an
incorrect BAD_STATEID return from a FREE_STATEID in the above situation
and then failing.

The spec language honestly was probably a mistake but at this point with
implementations already following it we're probably stuck with that.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index fcc0610..a7d8a11 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4514,7 +4514,6 @@ __be32
 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
            struct nfsd4_locku *locku)
 {
-       struct nfs4_lockowner *lo;
        struct nfs4_ol_stateid *stp;
        struct file *filp = NULL;
        struct file_lock *file_lock = NULL;
@@ -4547,10 +4546,9 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                status = nfserr_jukebox;
                goto out;
        }
-       lo = lockowner(stp->st_stateowner);
        locks_init_lock(file_lock);
        file_lock->fl_type = F_UNLCK;
-       file_lock->fl_owner = (fl_owner_t)lo;
+       file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
        file_lock->fl_pid = current->tgid;
        file_lock->fl_file = filp;
        file_lock->fl_flags = FL_POSIX;
@@ -4569,11 +4567,6 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
        update_stateid(&stp->st_stid.sc_stateid);
        memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
 
-       if (nfsd4_has_session(cstate) && !check_for_locks(stp->st_file, lo)) {
-               WARN_ON_ONCE(cstate->replay_owner);
-               release_lockowner(lo);
-       }
-
 out:
        nfsd4_bump_seqid(cstate, status);
        if (!cstate->replay_owner)