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authorJ. Bruce Fields <bfields@redhat.com>2013-03-21 11:21:50 -0400
committerJ. Bruce Fields <bfields@redhat.com>2013-04-04 13:25:15 -0400
commit68a3396178e6688ad7367202cdf0af8ed03c8727 (patch)
tree1a05bea4199eb6637860a5242a9f8794c0fba5c6 /fs/nfsd
parent8be2d2344cc192c20d7b2aa3211a5b74082e47d4 (diff)
nfsd4: shut down more of delegation earlier
Once we've unhashed the delegation, it's only hanging around for the benefit of an oustanding recall, which only needs the encoded filehandle, stateid, and dl_retries counter. No point keeping the file around any longer, or keeping it hashed. This also fixes a race: calls to idr_remove should really be serialized by the caller, but the nfs4_put_delegation call from the callback code isn't taking the state lock. (Better might be to cancel the callback before destroying the delegation, and remove any need for reference counting--but I don't see an easy way to cancel an rpc call.) Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7293e298aee..26a03fa6840 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -417,21 +417,18 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
return dp;
}
-static void free_stid(struct nfs4_stid *s, struct kmem_cache *slab)
+static void remove_stid(struct nfs4_stid *s)
{
struct idr *stateids = &s->sc_client->cl_stateids;
idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
- kmem_cache_free(slab, s);
}
void
nfs4_put_delegation(struct nfs4_delegation *dp)
{
if (atomic_dec_and_test(&dp->dl_count)) {
- dprintk("NFSD: freeing dp %p\n",dp);
- put_nfs4_file(dp->dl_file);
- free_stid(&dp->dl_stid, deleg_slab);
+ kmem_cache_free(deleg_slab, dp);
num_delegations--;
}
}
@@ -462,6 +459,9 @@ unhash_delegation(struct nfs4_delegation *dp)
list_del_init(&dp->dl_recall_lru);
spin_unlock(&recall_lock);
nfs4_put_deleg_lease(dp->dl_file);
+ put_nfs4_file(dp->dl_file);
+ dp->dl_file = NULL;
+ remove_stid(&dp->dl_stid);
nfs4_put_delegation(dp);
}
@@ -605,7 +605,8 @@ static void close_generic_stateid(struct nfs4_ol_stateid *stp)
static void free_generic_stateid(struct nfs4_ol_stateid *stp)
{
- free_stid(&stp->st_stid, stateid_slab);
+ remove_stid(&stp->st_stid);
+ kmem_cache_free(stateid_slab, stp);
}
static void release_lock_stateid(struct nfs4_ol_stateid *stp)