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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-04-21 20:36:19 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-04-21 21:01:00 +0400 |
| commit | 7bf97bc27308cfdc7a8dadd40ae50f7c4cb09b01 (patch) | |
| tree | e2b24a12db92f9ae9c99b4a3d9d7ef462dd16429 | |
| parent | c77365c963cf8703ecf1004cd3b298068a3e1b76 (diff) | |
| download | linux-7bf97bc27308cfdc7a8dadd40ae50f7c4cb09b01.tar.xz | |
NFSv4: Keep dropped state owners on the LRU list for a while
To ensure that we don't reuse their identifiers.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| -rw-r--r-- | fs/nfs/nfs4state.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index b300fb840b21..7f0fcfc1fe9d 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -521,6 +521,14 @@ out: /** * nfs4_put_state_owner - Release a nfs4_state_owner * @sp: state owner data to release + * + * Note that we keep released state owners on an LRU + * list. + * This caches valid state owners so that they can be + * reused, to avoid the OPEN_CONFIRM on minor version 0. + * It also pins the uniquifier of dropped state owners for + * a while, to ensure that those state owner names are + * never reused. */ void nfs4_put_state_owner(struct nfs4_state_owner *sp) { @@ -530,15 +538,9 @@ void nfs4_put_state_owner(struct nfs4_state_owner *sp) if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) return; - if (!RB_EMPTY_NODE(&sp->so_server_node)) { - sp->so_expires = jiffies; - list_add_tail(&sp->so_lru, &server->state_owners_lru); - spin_unlock(&clp->cl_lock); - } else { - nfs4_remove_state_owner_locked(sp); - spin_unlock(&clp->cl_lock); - nfs4_free_state_owner(sp); - } + sp->so_expires = jiffies; + list_add_tail(&sp->so_lru, &server->state_owners_lru); + spin_unlock(&clp->cl_lock); } /** |