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authorShirish Pargaonkar <shirishpargaonkar@gmail.com>2013-10-03 05:44:45 -0500
committerSteve French <smfrench@gmail.com>2013-10-06 20:18:42 -0500
commiteb4c7df6c20b407ecbf1a985edc33d967371c2e8 (patch)
tree09e3117fabaa3ec8f95f3e70a747f5e0f9990ada /fs
parentc31f330719b7331b2112a5525fe5941a99ac223d (diff)
downloadlinux-eb4c7df6c20b407ecbf1a985edc33d967371c2e8.tar.gz
cifs: Avoid umount hangs with smb2 when server is unresponsive
Do not send SMB2 Logoff command when reconnecting, the way smb1 code base works. Also, no need to wait for a credit for an echo command when one is already in flight. Without these changes, umount command hangs if the server is unresponsive e.g. hibernating. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/smb2pdu.c6
-rw-r--r--fs/cifs/transport.c9
2 files changed, 13 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index eba0efde66d..edccb525246 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -687,6 +687,10 @@ SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
else
return -EIO;
+ /* no need to send SMB logoff if uid already closed due to reconnect */
+ if (ses->need_reconnect)
+ goto smb2_session_already_dead;
+
rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
if (rc)
return rc;
@@ -701,6 +705,8 @@ SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
+
+smb2_session_already_dead:
return rc;
}
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 6fdcb1b4a10..800b938e406 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -410,8 +410,13 @@ static int
wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
const int optype)
{
- return wait_for_free_credits(server, timeout,
- server->ops->get_credits_field(server, optype));
+ int *val;
+
+ val = server->ops->get_credits_field(server, optype);
+ /* Since an echo is already inflight, no need to wait to send another */
+ if (*val <= 0 && optype == CIFS_ECHO_OP)
+ return -EAGAIN;
+ return wait_for_free_credits(server, timeout, val);
}
static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,