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fs: dlm: add check if dlm is currently running

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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);