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nfsd: clean up refcounting for lockowners

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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 <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-07-29 21:34:31 -04:00 committed by J. Bruce Fields
parent e4f1dd7fc2
commit 5adfd8850b
1 changed files with 7 additions and 22 deletions
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29
fs/nfsd/nfs4state.c
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@ -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;