diff options
| -rw-r--r-- | fs/nfsd/nfs4callback.c | 71 |
1 files changed, 34 insertions, 37 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index 31d6633c7fe..c17a5202ee3 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -39,6 +39,7 @@ #include <linux/errno.h> #include <linux/delay.h> #include <linux/sched.h> +#include <linux/kthread.h> #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/clnt.h> @@ -365,6 +366,35 @@ nfsd4_lookupcred(struct nfs4_client *clp, int taskflags) return ret; } +/* Reference counting, callback cleanup, etc., all look racy as heck. + * And why is cb_set an atomic? */ + +static int do_probe_callback(void *data) +{ + struct nfs4_client *clp = data; + struct nfs4_callback *cb = &clp->cl_callback; + struct rpc_message msg = { + .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], + .rpc_argp = clp, + }; + int status; + + msg.rpc_cred = nfsd4_lookupcred(clp, 0); + if (IS_ERR(msg.rpc_cred)) + goto out; + status = rpc_call_sync(cb->cb_client, &msg, RPC_TASK_SOFT); + put_rpccred(msg.rpc_cred); + + if (status) { + rpc_shutdown_client(cb->cb_client); + cb->cb_client = NULL; + } else + atomic_set(&cb->cb_set, 1); +out: + put_nfs4_client(clp); + return 0; +} + /* * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... */ @@ -390,11 +420,7 @@ nfsd4_probe_callback(struct nfs4_client *clp) .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */ .flags = (RPC_CLNT_CREATE_NOPING), }; - struct rpc_message msg = { - .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], - .rpc_argp = clp, - }; - int status; + struct task_struct *t; if (atomic_read(&cb->cb_set)) return; @@ -426,16 +452,11 @@ nfsd4_probe_callback(struct nfs4_client *clp) /* the task holds a reference to the nfs4_client struct */ atomic_inc(&clp->cl_count); - msg.rpc_cred = nfsd4_lookupcred(clp,0); - if (IS_ERR(msg.rpc_cred)) - goto out_release_clp; - status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL); - put_rpccred(msg.rpc_cred); + t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe"); - if (status != 0) { - dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n"); + if (IS_ERR(t)) goto out_release_clp; - } + return; out_release_clp: @@ -447,30 +468,6 @@ out_err: (int)clp->cl_name.len, clp->cl_name.data); } -static void -nfs4_cb_null(struct rpc_task *task, void *dummy) -{ - struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; - struct nfs4_callback *cb = &clp->cl_callback; - __be32 addr = htonl(cb->cb_addr); - - dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status); - - if (task->tk_status < 0) { - dprintk("NFSD: callback establishment to client %.*s failed\n", - (int)clp->cl_name.len, clp->cl_name.data); - goto out; - } - atomic_set(&cb->cb_set, 1); - dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr)); -out: - put_nfs4_client(clp); -} - -static const struct rpc_call_ops nfs4_cb_null_ops = { - .rpc_call_done = nfs4_cb_null, -}; - /* * called with dp->dl_count inc'ed. * nfs4_lock_state() may or may not have been called. |