nfs41: Allow NFSv4 and NFSv4.1 callback services to coexist
Tracks the nfs_callback_info for both versions, enabling the callback
service for v4 and v4.1 to run concurrently and be stopped independently
of each other.
Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 37815f3..e69b8f6 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -36,7 +36,7 @@
struct task_struct *task;
};
-static struct nfs_callback_data nfs_callback_info;
+static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
static DEFINE_MUTEX(nfs_callback_mutex);
static struct svc_program nfs4_callback_program;
@@ -60,7 +60,7 @@
&nfs_callback_set_tcpport, 0644);
/*
- * This is the callback kernel thread.
+ * This is the NFSv4 callback kernel thread.
*/
static int
nfs4_callback_svc(void *vrqstp)
@@ -174,8 +174,6 @@
finish_wait(&serv->sv_cb_waitq, &wq);
}
unlock_kernel();
- nfs_callback_info.task = NULL;
- svc_exit_thread(rqstp);
return 0;
}
@@ -251,13 +249,14 @@
struct svc_serv *serv = NULL;
struct svc_rqst *rqstp;
int (*callback_svc)(void *vrqstp);
+ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
char svc_name[12];
int ret = 0;
int minorversion_setup;
mutex_lock(&nfs_callback_mutex);
- if (nfs_callback_info.users++ || nfs_callback_info.task != NULL) {
- nfs_callback_bc_serv(minorversion, xprt, &nfs_callback_info);
+ if (cb_info->users++ || cb_info->task != NULL) {
+ nfs_callback_bc_serv(minorversion, xprt, cb_info);
goto out;
}
serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE, NULL);
@@ -282,17 +281,14 @@
svc_sock_update_bufs(serv);
sprintf(svc_name, "nfsv4.%u-svc", minorversion);
- nfs_callback_info.serv = serv;
- nfs_callback_info.rqst = rqstp;
- nfs_callback_info.task = kthread_run(callback_svc,
- nfs_callback_info.rqst,
- svc_name);
- if (IS_ERR(nfs_callback_info.task)) {
- ret = PTR_ERR(nfs_callback_info.task);
- svc_exit_thread(nfs_callback_info.rqst);
- nfs_callback_info.serv = NULL;
- nfs_callback_info.rqst = NULL;
- nfs_callback_info.task = NULL;
+ cb_info->serv = serv;
+ cb_info->rqst = rqstp;
+ cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name);
+ if (IS_ERR(cb_info->task)) {
+ ret = PTR_ERR(cb_info->task);
+ svc_exit_thread(cb_info->rqst);
+ cb_info->rqst = NULL;
+ cb_info->task = NULL;
goto out_err;
}
out:
@@ -309,23 +305,25 @@
out_err:
dprintk("NFS: Couldn't create callback socket or server thread; "
"err = %d\n", ret);
- nfs_callback_info.users--;
+ cb_info->users--;
goto out;
}
/*
* Kill the callback thread if it's no longer being used.
*/
-void nfs_callback_down(void)
+void nfs_callback_down(int minorversion)
{
+ struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
+
mutex_lock(&nfs_callback_mutex);
- nfs_callback_info.users--;
- if (nfs_callback_info.users == 0 && nfs_callback_info.task != NULL) {
- kthread_stop(nfs_callback_info.task);
- svc_exit_thread(nfs_callback_info.rqst);
- nfs_callback_info.serv = NULL;
- nfs_callback_info.rqst = NULL;
- nfs_callback_info.task = NULL;
+ cb_info->users--;
+ if (cb_info->users == 0 && cb_info->task != NULL) {
+ kthread_stop(cb_info->task);
+ svc_exit_thread(cb_info->rqst);
+ cb_info->serv = NULL;
+ cb_info->rqst = NULL;
+ cb_info->task = NULL;
}
mutex_unlock(&nfs_callback_mutex);
}
diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index 29123b5..88d2e11 100644
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -64,11 +64,8 @@
#ifdef CONFIG_NFS_V4
extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
-extern void nfs_callback_down(void);
-#else
-#define nfs_callback_up() (0)
-#define nfs_callback_down() do {} while(0)
-#endif
+extern void nfs_callback_down(int minorversion);
+#endif /* CONFIG_NFS_V4 */
/*
* nfs41: Callbacks are expected to not cause substantial latency,
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index df2b40d..ac6575c 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -181,7 +181,7 @@
{
#ifdef CONFIG_NFS_V4
if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
- nfs_callback_down();
+ nfs_callback_down(clp->cl_minorversion);
#endif /* CONFIG_NFS_V4 */
}