Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-qa0-f41.google.com ([209.85.216.41]:53011 "EHLO mail-qa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754412AbaG2UfJ (ORCPT ); Tue, 29 Jul 2014 16:35:09 -0400 Received: by mail-qa0-f41.google.com with SMTP id j7so276750qaq.14 for ; Tue, 29 Jul 2014 13:35:08 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, hch@infradead.org Subject: [PATCH v2 26/38] nfsd: clean up refcounting for lockowners Date: Tue, 29 Jul 2014 16:34:09 -0400 Message-Id: <1406666061-14175-27-git-send-email-jlayton@primarydata.com> In-Reply-To: <1406666061-14175-1-git-send-email-jlayton@primarydata.com> References: <1406666061-14175-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Ensure that lockowner references are only held by lockstateids and operations that are in-progress. With this, we can get rid of release_lockowner_if_empty, which will be racy once we remove client_mutex protection. Signed-off-by: Jeff Layton --- fs/nfsd/nfs4state.c | 29 +++++++---------------------- 1 file changed, 7 insertions(+), 22 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 00cb44fa07bd..549218087595 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -933,7 +933,7 @@ static void nfs4_free_lock_stateid(struct nfs4_stid *stid) nfs4_free_ol_stateid(stid); } -static void __release_lock_stateid(struct nfs4_ol_stateid *stp) +static void release_lock_stateid(struct nfs4_ol_stateid *stp) { struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); @@ -957,7 +957,7 @@ static void release_lockowner_stateids(struct nfs4_lockowner *lo) while (!list_empty(&lo->lo_owner.so_stateids)) { stp = list_first_entry(&lo->lo_owner.so_stateids, struct nfs4_ol_stateid, st_perstateowner); - __release_lock_stateid(stp); + release_lock_stateid(stp); } } @@ -968,21 +968,6 @@ static void release_lockowner(struct nfs4_lockowner *lo) nfs4_put_stateowner(&lo->lo_owner); } -static void release_lockowner_if_empty(struct nfs4_lockowner *lo) -{ - if (list_empty(&lo->lo_owner.so_stateids)) - release_lockowner(lo); -} - -static void release_lock_stateid(struct nfs4_ol_stateid *stp) -{ - struct nfs4_lockowner *lo; - - lo = lockowner(stp->st_stateowner); - __release_lock_stateid(stp); - release_lockowner_if_empty(lo); -} - static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp) __releases(&open_stp->st_stateowner->so_client->cl_lock) __acquires(&open_stp->st_stateowner->so_client->cl_lock) @@ -4323,7 +4308,7 @@ nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp) if (check_for_locks(stp->st_stid.sc_file, lo)) return nfserr_locks_held; - release_lockowner_if_empty(lo); + release_lock_stateid(stp); return nfs_ok; } @@ -4938,8 +4923,6 @@ lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); if (lo == NULL) return nfserr_jukebox; - /* FIXME: extra reference for new lockowners for the client */ - atomic_inc(&lo->lo_owner.so_count); } else { /* with an existing lockowner, seqids must be the same */ status = nfserr_bad_seqid; @@ -4950,7 +4933,6 @@ lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, *lst = find_or_create_lock_stateid(lo, fi, inode, ost, new); if (*lst == NULL) { - release_lockowner_if_empty(lo); status = nfserr_jukebox; goto out; } @@ -5379,6 +5361,7 @@ nfsd4_release_lockowner(struct svc_rqst *rqstp, continue; if (same_owner_str(tmp, owner, clid)) { sop = tmp; + atomic_inc(&sop->so_count); break; } } @@ -5392,8 +5375,10 @@ nfsd4_release_lockowner(struct svc_rqst *rqstp, lo = lockowner(sop); /* see if there are still any locks associated with it */ list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) { - if (check_for_locks(stp->st_stid.sc_file, lo)) + if (check_for_locks(stp->st_stid.sc_file, lo)) { + nfs4_put_stateowner(sop); goto out; + } } status = nfs_ok; -- 1.9.3