Currently the echo interval is set to 60 seconds using a macro. This
setting determines the interval at which echo requests are sent to the
server on an idling connection. This setting also affects the time
required for a connection to an unresponsive server to timeout.
Making this setting a tunable allows users to control the echo interval
times as well as control the time after which the connecting to an
unresponsive server times out.
v2: Change MIN and MAX timeout values
v3: Remove incorrect comment in cifs_get_tcp_session
Signed-off-by: Sachin Prabhu <sprabhu@xxxxxxxxxx>
---
fs/cifs/cifsfs.c | 2 ++
fs/cifs/cifsglob.h | 8 ++++++--
fs/cifs/connect.c | 32 ++++++++++++++++++++++++++------
3 files changed, 34 insertions(+), 8 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index cbc0f4b..eab2de6 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -507,6 +507,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_printf(s, ",rsize=%u", cifs_sb->rsize);
seq_printf(s, ",wsize=%u", cifs_sb->wsize);
+ seq_printf(s, ",echo_interval=%lu",
+ tcon->ses->server->echo_interval / HZ);
/* convert actimeo and display it in seconds */
seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 2b510c5..9d14926 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -70,8 +70,10 @@
#define SERVER_NAME_LENGTH 40
#define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1)
-/* SMB echo "timeout" -- FIXME: tunable? */
-#define SMB_ECHO_INTERVAL (60 * HZ)
+/* echo interval in seconds */
+#define SMB_ECHO_INTERVAL_MIN 1
+#define SMB_ECHO_INTERVAL_MAX 600
+#define SMB_ECHO_INTERVAL_DEFAULT 60
#include "cifspdu.h"
@@ -507,6 +509,7 @@ struct smb_vol {
struct sockaddr_storage dstaddr; /* destination address */
struct sockaddr_storage srcaddr; /* allow binding to a local IP */
struct nls_table *local_nls;
+ unsigned int echo_interval; /* echo interval in secs */
};
#define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
@@ -628,6 +631,7 @@ struct TCP_Server_Info {
unsigned int max_read;
unsigned int max_write;
#endif /* CONFIG_CIFS_SMB2 */
+ unsigned long echo_interval;
};
static inline unsigned int
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ecb0803..dc405db 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -95,6 +95,7 @@ enum {
Opt_cruid, Opt_gid, Opt_file_mode,
Opt_dirmode, Opt_port,
Opt_rsize, Opt_wsize, Opt_actimeo,
+ Opt_echo_interval,
/* Mount options which take string value */
Opt_user, Opt_pass, Opt_ip,
@@ -188,6 +189,7 @@ static const match_table_t cifs_mount_option_tokens = {
{ Opt_rsize, "rsize=%s" },
{ Opt_wsize, "wsize=%s" },
{ Opt_actimeo, "actimeo=%s" },
+ { Opt_echo_interval, "echo_interval=%s" },
{ Opt_blank_user, "user=" },
{ Opt_blank_user, "username=" },
@@ -418,6 +420,7 @@ cifs_echo_request(struct work_struct *work)
int rc;
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, echo.work);
+ unsigned long echo_interval = server->echo_interval;
/*
* We cannot send an echo if it is disabled or until the
@@ -427,7 +430,7 @@ cifs_echo_request(struct work_struct *work)
*/
if (!server->ops->need_neg || server->ops->need_neg(server) ||
(server->ops->can_echo && !server->ops->can_echo(server)) ||
- time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
+ time_before(jiffies, server->lstrp + echo_interval - HZ))
goto requeue_echo;
rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
@@ -436,7 +439,7 @@ cifs_echo_request(struct work_struct *work)
server->hostname);
requeue_echo:
- queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
+ queue_delayed_work(cifsiod_wq, &server->echo, echo_interval);
}
static bool
@@ -487,9 +490,9 @@ server_unresponsive(struct TCP_Server_Info *server)
* a response in >60s.
*/
if (server->tcpStatus == CifsGood &&
- time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
- cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
- server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
+ time_after(jiffies, server->lstrp + 2 * server->echo_interval)) {
+ cifs_dbg(VFS, "Server %s has not responded in %lu seconds. Reconnecting...\n",
+ server->hostname, (2 * server->echo_interval) / HZ);
cifs_reconnect(server);
wake_up(&server->response_q);
return true;
@@ -1624,6 +1627,14 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
goto cifs_parse_mount_err;
}
break;
+ case Opt_echo_interval:
+ if (get_option_ul(args, &option)) {
+ cifs_dbg(VFS, "%s: Invalid echo interval value\n",
+ __func__);
+ goto cifs_parse_mount_err;
+ }
+ vol->echo_interval = option;
+ break;
/* String Arguments */
@@ -2089,6 +2100,9 @@ static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
if (!match_security(server, vol))
return 0;
+ if (server->echo_interval != vol->echo_interval)
+ return 0;
+
return 1;
}
@@ -2208,6 +2222,12 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
tcp_ses->tcpStatus = CifsNew;
++tcp_ses->srv_count;
+ if (volume_info->echo_interval > SMB_ECHO_INTERVAL_MIN ||
+ volume_info->echo_interval < SMB_ECHO_INTERVAL_MAX)
+ tcp_ses->echo_interval = volume_info->echo_interval * HZ;
+ else
+ tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
+
rc = ip_connect(tcp_ses);
if (rc < 0) {
cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
@@ -2237,7 +2257,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
cifs_fscache_get_client_cookie(tcp_ses);
/* queue echo request delayed work */
- queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
+ queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
return tcp_ses;
--
2.5.0
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