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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-02-27 22:05:29 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-27 22:36:16 +0400
commitda3b462296e421e8f54b54b7d2706488661c36e2 (patch)
tree9e1330dc3ffafa9ae758949f03b592b12a46ed84 /net/sunrpc
parent7df529af5fb4b4064f8cd62629e259ac79c0b4ca (diff)
downloadlinux-da3b462296e421e8f54b54b7d2706488661c36e2.tar.xz
SUNRPC: release per-net clients lock before calling PipeFS dentries creation
v3: 1) Lookup for client is performed from the beginning of the list on each PipeFS event handling operation. Lockdep is sad otherwise, because inode mutex is taken on PipeFS dentry creation, which can be called on mount notification, where this per-net client lock is taken on clients list walk. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index bb7ed2f3aee6..25c3da53fb69 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -204,21 +204,37 @@ static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
return err;
}
+static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct rpc_clnt *clnt;
+
+ spin_lock(&sn->rpc_client_lock);
+ list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+ if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
+ ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
+ continue;
+ atomic_inc(&clnt->cl_count);
+ spin_unlock(&sn->rpc_client_lock);
+ return clnt;
+ }
+ spin_unlock(&sn->rpc_client_lock);
+ return NULL;
+}
+
static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct super_block *sb = ptr;
struct rpc_clnt *clnt;
int error = 0;
- struct sunrpc_net *sn = net_generic(sb->s_fs_info, sunrpc_net_id);
- spin_lock(&sn->rpc_client_lock);
- list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+ while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
error = __rpc_pipefs_event(clnt, event, sb);
+ rpc_release_client(clnt);
if (error)
break;
}
- spin_unlock(&sn->rpc_client_lock);
return error;
}