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| author | Jeff Layton <jlayton@redhat.com> | 2011-01-11 07:24:23 -0500 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2011-01-20 17:48:10 +0000 |
| commit | c74093b694998d30105d9904686da5e3576497c4 (patch) | |
| tree | 2f4758b3d24ea2a1647a7402c8c49ffb515b388d /fs/cifs/connect.c | |
| parent | 766fdbb57fdb1e53bc34c431103e95383d7f13ba (diff) | |
| download | lwn-c74093b694998d30105d9904686da5e3576497c4.tar.gz lwn-c74093b694998d30105d9904686da5e3576497c4.zip | |
cifs: set up recurring workqueue job to do SMB echo requests
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/connect.c')
| -rw-r--r-- | fs/cifs/connect.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index aa66de1db5f5..f38ca084c9d2 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -52,6 +52,9 @@ #define CIFS_PORT 445 #define RFC1001_PORT 139 +/* SMB echo "timeout" -- FIXME: tunable? */ +#define SMB_ECHO_INTERVAL (60 * HZ) + extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24); @@ -333,6 +336,26 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB) } +static void +cifs_echo_request(struct work_struct *work) +{ + int rc; + struct TCP_Server_Info *server = container_of(work, + struct TCP_Server_Info, echo.work); + + /* no need to ping if we got a response recently */ + if (time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ)) + goto requeue_echo; + + rc = CIFSSMBEcho(server); + if (rc) + cFYI(1, "Unable to send echo request to server: %s", + server->hostname); + +requeue_echo: + queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL); +} + static int cifs_demultiplex_thread(struct TCP_Server_Info *server) { @@ -1571,6 +1594,8 @@ cifs_put_tcp_session(struct TCP_Server_Info *server) list_del_init(&server->tcp_ses_list); spin_unlock(&cifs_tcp_ses_lock); + cancel_delayed_work_sync(&server->echo); + spin_lock(&GlobalMid_Lock); server->tcpStatus = CifsExiting; spin_unlock(&GlobalMid_Lock); @@ -1662,6 +1687,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info) tcp_ses->sequence_number = 0; 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); /* * at this point we are the only ones with the pointer @@ -1710,6 +1736,9 @@ cifs_get_tcp_session(struct smb_vol *volume_info) cifs_fscache_get_client_cookie(tcp_ses); + /* queue echo request delayed work */ + queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL); + return tcp_ses; out_err_crypto_release: |