3.19.8-ckt8 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
commit 3fcbbd244ed1d20dc0eb7d48d729503992fa9b7d upstream.
It's possible that a DELEGRETURN could race with (e.g.) client expiry,
in which case we could end up putting the delegation hash reference more
than once.
Have unhash_delegation_locked return a bool that indicates whether it
was already unhashed. In the case of destroy_delegation we only
conditionally put the hash reference if that returns true.
The other callers of unhash_delegation_locked call it while walking
list_heads that shouldn't yet be detached. If we find that it doesn't
return true in those cases, then throw a WARN_ON as that indicates that
we have a partially hashed delegation, and that something is likely very
wrong.
Tested-by: Andrew W Elble <aweits@xxxxxxx>
Tested-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index aab4990..8bb73f8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -715,13 +715,16 @@ hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
}
-static void
+static bool
unhash_delegation_locked(struct nfs4_delegation *dp)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
lockdep_assert_held(&state_lock);
+ if (list_empty(&dp->dl_perfile))
+ return false;
+
dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
/* Ensure that deleg break won't try to requeue it */
++dp->dl_time;
@@ -730,15 +733,20 @@ unhash_delegation_locked(struct nfs4_delegation *dp)
list_del_init(&dp->dl_recall_lru);
list_del_init(&dp->dl_perfile);
spin_unlock(&fp->fi_lock);
+ return true;
}
static void destroy_delegation(struct nfs4_delegation *dp)
{
+ bool unhashed;
+
spin_lock(&state_lock);
- unhash_delegation_locked(dp);
+ unhashed = unhash_delegation_locked(dp);
spin_unlock(&state_lock);
- nfs4_put_deleg_lease(dp->dl_stid.sc_file);
- nfs4_put_stid(&dp->dl_stid);
+ if (unhashed) {
+ nfs4_put_deleg_lease(dp->dl_stid.sc_file);
+ nfs4_put_stid(&dp->dl_stid);
+ }
}
static void revoke_delegation(struct nfs4_delegation *dp)
@@ -1653,7 +1661,7 @@ __destroy_client(struct nfs4_client *clp)
spin_lock(&state_lock);
while (!list_empty(&clp->cl_delegations)) {
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
- unhash_delegation_locked(dp);
+ WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
@@ -4252,7 +4260,7 @@ nfs4_laundromat(struct nfsd_net *nn)
new_timeo = min(new_timeo, t);
break;
}
- unhash_delegation_locked(dp);
+ WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
@@ -6164,7 +6172,7 @@ static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
continue;
atomic_inc(&clp->cl_refcount);
- unhash_delegation_locked(dp);
+ WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, victims);
}
++count;
@@ -6494,7 +6502,7 @@ nfs4_state_shutdown_net(struct net *net)
spin_lock(&state_lock);
list_for_each_safe(pos, next, &nn->del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
- unhash_delegation_locked(dp);
+ WARN_ON(!unhash_delegation_locked(dp));
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&state_lock);
--
1.9.1
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