From: Alexander Aring aahringo@redhat.com
[ Upstream commit 517461630d1c25ee4dfc1dee80973a64189d6ccf ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/dlm/config.c | 34 ++++++++++++++++++++++++++++++++-- fs/dlm/lowcomms.c | 2 +- fs/dlm/lowcomms.h | 3 +++ 3 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/fs/dlm/config.c b/fs/dlm/config.c index 8439610c266a..88d95d96e36c 100644 --- a/fs/dlm/config.c +++ b/fs/dlm/config.c @@ -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); diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 440dce99d0d9..c438ce0ac115 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -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; diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h index 790d6703b17e..bcd4dbd1dc98 100644 --- a/fs/dlm/lowcomms.h +++ b/fs/dlm/lowcomms.h @@ -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);