The wake_up_var interface is fragile as barriers are sometimes needed.
There are now new interfaces so that most wake-ups can use an interface
that is guaranteed to have all barriers needed.
This patch changes the wake up on cl_cb_inflight to use
atomic_dec_and_wake_up().
It also changes the wake up on rp_locked to use store_release_wake_up().
This involves changing rp_locked from atomic_t to int.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
fs/nfsd/nfs4callback.c | 3 +--
fs/nfsd/nfs4state.c | 16 ++++++----------
fs/nfsd/state.h | 2 +-
3 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 3877b53e429f..a8dc9de2f7fb 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1036,8 +1036,7 @@ static void nfsd41_cb_inflight_begin(struct nfs4_client *clp)
static void nfsd41_cb_inflight_end(struct nfs4_client *clp)
{
- if (atomic_dec_and_test(&clp->cl_cb_inflight))
- wake_up_var(&clp->cl_cb_inflight);
+ atomic_dec_and_wake_up(&clp->cl_cb_inflight);
}
static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 741b9449f727..9fbf7c8f0a3e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4739,7 +4739,7 @@ static void init_nfs4_replay(struct nfs4_replay *rp)
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
- atomic_set(&rp->rp_locked, RP_UNLOCKED);
+ rp->rp_locked = RP_UNLOCKED;
}
static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
@@ -4747,9 +4747,9 @@ static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
{
if (!nfsd4_has_session(cstate)) {
wait_var_event(&so->so_replay.rp_locked,
- atomic_cmpxchg(&so->so_replay.rp_locked,
- RP_UNLOCKED, RP_LOCKED) != RP_LOCKED);
- if (atomic_read(&so->so_replay.rp_locked) == RP_UNHASHED)
+ cmpxchg(&so->so_replay.rp_locked,
+ RP_UNLOCKED, RP_LOCKED) != RP_LOCKED);
+ if (so->so_replay.rp_locked == RP_UNHASHED)
return -EAGAIN;
cstate->replay_owner = nfs4_get_stateowner(so);
}
@@ -4762,9 +4762,7 @@ void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
if (so != NULL) {
cstate->replay_owner = NULL;
- atomic_set(&so->so_replay.rp_locked, RP_UNLOCKED);
- smp_mb__after_atomic();
- wake_up_var(&so->so_replay.rp_locked);
+ store_release_wake_up(&so->so_replay.rp_locked, RP_UNLOCKED);
nfs4_put_stateowner(so);
}
}
@@ -5069,9 +5067,7 @@ move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
* Some threads with a reference might be waiting for rp_locked,
* so tell them to stop waiting.
*/
- atomic_set(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED);
- smp_mb__after_atomic();
- wake_up_var(&oo->oo_owner.so_replay.rp_locked);
+ store_release_wake_up(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED);
wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
release_all_access(s);
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index e16bb3717fb9..ba30b2335b66 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -505,7 +505,7 @@ struct nfs4_replay {
unsigned int rp_buflen;
char *rp_buf;
struct knfsd_fh rp_openfh;
- atomic_t rp_locked;
+ int rp_locked;
char rp_ibuf[NFSD4_REPLAY_ISIZE];
};
--
2.47.0
