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fs: dlm: add check if dlm is currently running 

This patch adds checks for dlm config attributes regarding to protocol
parameters as it makes only sense to change them when dlm is not running.
It also adds a check for valid protocol specifiers and return invalid
argument if they are not supported.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2021-03-01 17:05:13 -05:00 committed by David Teigland
parent 8aa9540b49
commit 517461630d
3 changed files with 36 additions and 3 deletions
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34
fs/dlm/config.c
View File

@ -164,6 +164,36 @@ static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
} \
CONFIGFS_ATTR(cluster_, name);
static int dlm_check_protocol_and_dlm_running(unsigned int x)
{
switch (x) {
case 0:
/* TCP */
break;
case 1:
/* SCTP */
break;
default:
return -EINVAL;
}
if (dlm_allow_conn)
return -EBUSY;
return 0;
}
static int dlm_check_zero_and_dlm_running(unsigned int x)
{
if (!x)
return -EINVAL;
if (dlm_allow_conn)
return -EBUSY;
return 0;
}
static int dlm_check_zero(unsigned int x)
{
if (!x)
@ -180,7 +210,7 @@ static int dlm_check_buffer_size(unsigned int x)
return 0;
}
CLUSTER_ATTR(tcp_port, dlm_check_zero);
CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
CLUSTER_ATTR(recover_timer, dlm_check_zero);
@ -188,7 +218,7 @@ CLUSTER_ATTR(toss_secs, dlm_check_zero);
CLUSTER_ATTR(scan_secs, dlm_check_zero);
CLUSTER_ATTR(log_debug, NULL);
CLUSTER_ATTR(log_info, NULL);
CLUSTER_ATTR(protocol, NULL);
CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
CLUSTER_ATTR(mark, NULL);
CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
CLUSTER_ATTR(waitwarn_us, NULL);

2
fs/dlm/lowcomms.c
View File

@ -135,7 +135,7 @@ static DEFINE_SPINLOCK(dlm_node_addrs_spin);
static struct listen_connection listen_con;
static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT];
static int dlm_local_count;
static int dlm_allow_conn;
int dlm_allow_conn;
/* Work queues */
static struct workqueue_struct *recv_workqueue;

3
fs/dlm/lowcomms.h
View File

@ -14,6 +14,9 @@
#define LOWCOMMS_MAX_TX_BUFFER_LEN 4096
/* switch to check if dlm is running */
extern int dlm_allow_conn;
int dlm_lowcomms_start(void);
void dlm_lowcomms_stop(void);
void dlm_lowcomms_exit(void);