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SUNRPC: Add a flag to avoid reference counts on credentials 

Add a flag to signal to the RPC layer that the credential is already
pinned for the duration of the RPC call.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-02-07 19:11:12 -05:00
parent 1d179d6bd6
commit 7eac52648a
3 changed files with 6 additions and 3 deletions
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1
include/linux/sunrpc/sched.h
View File

@ -132,6 +132,7 @@ struct rpc_task_setup {
#define RPC_TASK_TIMEOUT 0x1000 /* fail with ETIMEDOUT on timeout */
#define RPC_TASK_NOCONNECT 0x2000 /* return ENOTCONN if not connected */
#define RPC_TASK_NO_RETRANS_TIMEOUT 0x4000 /* wait forever for a reply */
#define RPC_TASK_CRED_NOREF 0x8000 /* No refcount on the credential */
#define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
#define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)

5
net/sunrpc/clnt.c
View File

@ -1099,8 +1099,9 @@ rpc_task_set_rpc_message(struct rpc_task *task, const struct rpc_message *msg)
task->tk_msg.rpc_proc = msg->rpc_proc;
task->tk_msg.rpc_argp = msg->rpc_argp;
task->tk_msg.rpc_resp = msg->rpc_resp;
if (msg->rpc_cred != NULL)
task->tk_msg.rpc_cred = get_cred(msg->rpc_cred);
task->tk_msg.rpc_cred = msg->rpc_cred;
if (!(task->tk_flags & RPC_TASK_CRED_NOREF))
get_cred(task->tk_msg.rpc_cred);
}
}

3
net/sunrpc/sched.c
View File

@ -1162,7 +1162,8 @@ static void rpc_release_resources_task(struct rpc_task *task)
{
xprt_release(task);
if (task->tk_msg.rpc_cred) {
put_cred(task->tk_msg.rpc_cred);
if (!(task->tk_flags & RPC_TASK_CRED_NOREF))
put_cred(task->tk_msg.rpc_cred);
task->tk_msg.rpc_cred = NULL;
}
rpc_task_release_client(task);