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authorJ. Bruce Fields <bfields@redhat.com>2019-03-21 03:03:02 +0300
committerJ. Bruce Fields <bfields@redhat.com>2019-07-04 00:52:49 +0300
commit59f8e91b75ecf16f22d62eca0659c13901eff5f3 (patch)
tree71be0a7af288721f33e8c34e5ff6691d9c200098 /fs/nfsd
parent14ed14cc7c062bbed7821be0a93938dc78a49803 (diff)
downloadlinux-59f8e91b75ecf16f22d62eca0659c13901eff5f3.tar.xz
nfsd4: use reference count to free client
Keep a second reference count which is what is really used to decide when to free the client's memory. Next I'm going to add an nfsd/clients/ directory with a subdirectory for each NFSv4 client. File objects under nfsd/clients/ will hold these references. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c26
-rw-r--r--fs/nfsd/state.h1
2 files changed, 22 insertions, 5 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 194da1700cc4..de68c3cbea2b 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1879,6 +1879,24 @@ err_no_name:
return NULL;
}
+static void __free_client(struct kref *k)
+{
+ struct nfs4_client *clp = container_of(k, struct nfs4_client, cl_ref);
+
+ free_svc_cred(&clp->cl_cred);
+ kfree(clp->cl_ownerstr_hashtbl);
+ kfree(clp->cl_name.data);
+ idr_destroy(&clp->cl_stateids);
+ if (clp->cl_nfsd_dentry)
+ nfsd_client_rmdir(clp->cl_nfsd_dentry);
+ kmem_cache_free(client_slab, clp);
+}
+
+void drop_client(struct nfs4_client *clp)
+{
+ kref_put(&clp->cl_ref, __free_client);
+}
+
static void
free_client(struct nfs4_client *clp)
{
@@ -1891,11 +1909,7 @@ free_client(struct nfs4_client *clp)
free_session(ses);
}
rpc_destroy_wait_queue(&clp->cl_cb_waitq);
- free_svc_cred(&clp->cl_cred);
- kfree(clp->cl_ownerstr_hashtbl);
- kfree(clp->cl_name.data);
- idr_destroy(&clp->cl_stateids);
- kmem_cache_free(client_slab, clp);
+ drop_client(clp);
}
/* must be called under the client_lock */
@@ -2216,6 +2230,8 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
free_client(clp);
return NULL;
}
+
+ kref_init(&clp->cl_ref);
nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
clp->cl_time = get_seconds();
clear_bit(0, &clp->cl_cb_slot_busy);
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index f79ad7202e82..8eacdbc50cd7 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -348,6 +348,7 @@ struct nfs4_client {
u32 cl_exchange_flags;
/* number of rpc's in progress over an associated session: */
atomic_t cl_rpc_users;
+ struct kref cl_ref;
struct nfs4_op_map cl_spo_must_allow;
/* for nfs41 callbacks */