From fda3594362184383e73f0a2a5fa5b38ac0e04fd8 Mon Sep 17 00:00:00 2001 From: Steve French Date: Thu, 20 Jan 2011 18:06:34 +0000 Subject: [PATCH] [CIFS] cifs: reconnect unresponsive servers If the server isn't responding to echoes, we don't want to leave tasks hung waiting for it to reply. At that point, we'll want to reconnect so that soft mounts can return an error to userspace quickly. If the client hasn't received a reply after a specified number of echo intervals, assume that the transport is down and attempt to reconnect the socket. The number of echo_intervals to wait before attempting to reconnect is tunable via a module parameter. Setting it to 0, means that the client will never attempt to reconnect. The default is 5. Signed-off-by: Jeff Layton --- fs/cifs/cifsfs.c | 6 +++++- fs/cifs/cifsglob.h | 3 +++ fs/cifs/connect.c | 21 +++++++++++++++++---- 3 files changed, 25 insertions(+), 5 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index d9f652a522a6..99d777a03dd0 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -77,7 +77,11 @@ unsigned int cifs_max_pending = CIFS_MAX_REQ; module_param(cifs_max_pending, int, 0); MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. " "Default: 50 Range: 2 to 256"); - +unsigned short echo_retries = 5; +module_param(echo_retries, ushort, 0644); +MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and " + "reconnecting server. Default: 5. 0 means " + "never reconnect."); extern mempool_t *cifs_sm_req_poolp; extern mempool_t *cifs_req_poolp; extern mempool_t *cifs_mid_poolp; diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 9c728dd5b146..7040abc638fa 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -804,6 +804,9 @@ GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */ GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/ +/* reconnect after this many failed echo attempts */ +GLOBAL_EXTERN unsigned short echo_retries; + void cifs_oplock_break(struct work_struct *work); void cifs_oplock_break_get(struct cifsFileInfo *cfile); void cifs_oplock_break_put(struct cifsFileInfo *cfile); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index f38ca084c9d2..f5d7b59a3553 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -186,6 +186,7 @@ cifs_reconnect(struct TCP_Server_Info *server) kfree(server->session_key.response); server->session_key.response = NULL; server->session_key.len = 0; + server->lstrp = jiffies; mutex_unlock(&server->srv_mutex); /* mark submitted MIDs for retry and issue callback */ @@ -420,7 +421,20 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server) smb_msg.msg_control = NULL; smb_msg.msg_controllen = 0; pdu_length = 4; /* enough to get RFC1001 header */ + incomplete_rcv: + if (echo_retries > 0 && + time_after(jiffies, server->lstrp + + (echo_retries * SMB_ECHO_INTERVAL))) { + cERROR(1, "Server %s has not responded in %d seconds. " + "Reconnecting...", server->hostname, + (echo_retries * SMB_ECHO_INTERVAL / HZ)); + cifs_reconnect(server); + csocket = server->ssocket; + wake_up(&server->response_q); + continue; + } + length = kernel_recvmsg(csocket, &smb_msg, &iov, 1, pdu_length, 0 /* BB other flags? */); @@ -581,6 +595,8 @@ incomplete_rcv: } mid_entry = NULL; + server->lstrp = jiffies; + spin_lock(&GlobalMid_Lock); list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { mid_entry = list_entry(tmp, struct mid_q_entry, qhead); @@ -629,10 +645,6 @@ multi_t2_fnd: #ifdef CONFIG_CIFS_STATS2 mid_entry->when_received = jiffies; #endif - /* so we do not time out requests to server - which is still responding (since server could - be busy but not dead) */ - server->lstrp = jiffies; break; } mid_entry = NULL; @@ -1685,6 +1697,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info) volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); tcp_ses->session_estab = false; tcp_ses->sequence_number = 0; + tcp_ses->lstrp = jiffies; INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); INIT_LIST_HEAD(&tcp_ses->smb_ses_list); INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request); -- 2.30.2