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

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This reverts commit eb2099f31b "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>
This commit is contained in:
J. Bruce Fields 2013-06-17 17:29:40 -04:00
parent 89f6c3362c
commit 0a262ffb75
1 changed files with 1 additions and 8 deletions
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9
fs/nfsd/nfs4state.c
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@ -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)