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SUNRPC: traverse clients tree on PipeFS event

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v2: recursion was replaced by loop

If client is a clone, then it's parent can not be in the list.
But parent's Pipefs dentries have to be created and destroyed.

Note: event skip helper for clients introduced

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Stanislav Kinsbursky 2012-04-27 13:00:17 +04:00 committed by Trond Myklebust
parent 37629b572c
commit ea8cfa0679
1 changed files with 25 additions and 4 deletions
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29
net/sunrpc/clnt.c
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@ -176,8 +176,16 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name)
return 0;
}
static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
struct super_block *sb)
static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
{
if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
return 1;
return 0;
}
static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
struct super_block *sb)
{
struct dentry *dentry;
int err = 0;
@ -206,6 +214,20 @@ static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
return err;
}
static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
struct super_block *sb)
{
int error = 0;
for (;; clnt = clnt->cl_parent) {
if (!rpc_clnt_skip_event(clnt, event))
error = __rpc_clnt_handle_event(clnt, event, sb);
if (error || clnt == clnt->cl_parent)
break;
}
return error;
}
static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
{
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
@ -215,8 +237,7 @@ static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
if (clnt->cl_program->pipe_dir_name == NULL)
break;
if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
if (rpc_clnt_skip_event(clnt, event))
continue;
if (atomic_inc_not_zero(&clnt->cl_count) == 0)
continue;