[PATCH] nbd:clear NBD_BOUND flag when NBD connection is closed

[medadyoung]

From: Medad <medadyo...@gmail.com>

    If we do NOT clear NBD_BOUND flag when NBD connection is closed,
    then the original NBD device could not be used again.

Signed-off-by: Medad <medadyo...@gmail.com>
---
 drivers/block/nbd.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 64278f4..5c88490 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -277,10 +277,14 @@ static void sock_shutdown(struct nbd_device *nbd)
        struct nbd_config *config = nbd->config;
        int i;
 
-       if (config->num_connections == 0)
+       if (config->num_connections == 0) {
+               clear_bit(NBD_BOUND, &config->runtime_flags);
                return;
-       if (test_and_set_bit(NBD_DISCONNECTED, &config->runtime_flags))
+       }
+       if (test_and_set_bit(NBD_DISCONNECTED, &config->runtime_flags)) {
+               clear_bit(NBD_BOUND, &config->runtime_flags);
                return;
+       }
 
        for (i = 0; i < config->num_connections; i++) {
                struct nbd_sock *nsock = config->socks[i];
@@ -944,7 +948,7 @@ static int nbd_reconnect_socket(struct nbd_device *nbd, 
unsigned long arg)
                sockfd_put(old);
 
                clear_bit(NBD_DISCONNECTED, &config->runtime_flags);
-
+               clear_bit(NBD_BOUND, &config->runtime_flags);
                /* We take the tx_mutex in an error path in the recv_work, so we
                 * need to queue_work outside of the tx_mutex.
                 */
@@ -1020,6 +1024,7 @@ static int nbd_disconnect(struct nbd_device *nbd)
        dev_info(disk_to_dev(nbd->disk), "NBD_DISCONNECT\n");
        set_bit(NBD_DISCONNECT_REQUESTED, &config->runtime_flags);
        send_disconnects(nbd);
+       clear_bit(NBD_BOUND, &config->runtime_flags);
        return 0;
 }
 
-- 
2.7.4