Implement the _show and _store functions for the msgid_enabled configfs attribute under userdata. Set the sysdata_fields bit accordingly.
Reviewed-by: Breno Leitao leitao@debian.org Signed-off-by: Gustavo Luiz Duarte gustavold@gmail.com --- drivers/net/netconsole.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 5f8c8c6c5393..3bf8777fcd01 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -489,6 +489,19 @@ static void unregister_netcons_consoles(void) unregister_console(&netconsole); }
+static ssize_t sysdata_msgid_enabled_show(struct config_item *item, + char *buf) +{ + struct netconsole_target *nt = to_target(item->ci_parent); + bool msgid_enabled; + + mutex_lock(&dynamic_netconsole_mutex); + msgid_enabled = !!(nt->sysdata_fields & SYSDATA_MSGID); + mutex_unlock(&dynamic_netconsole_mutex); + + return sysfs_emit(buf, "%d\n", msgid_enabled); +} + /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. @@ -922,6 +935,40 @@ static void disable_sysdata_feature(struct netconsole_target *nt, nt->extradata_complete[nt->userdata_length] = 0; }
+static ssize_t sysdata_msgid_enabled_store(struct config_item *item, + const char *buf, size_t count) +{ + struct netconsole_target *nt = to_target(item->ci_parent); + bool msgid_enabled, curr; + ssize_t ret; + + ret = kstrtobool(buf, &msgid_enabled); + if (ret) + return ret; + + mutex_lock(&dynamic_netconsole_mutex); + curr = !!(nt->sysdata_fields & SYSDATA_MSGID); + if (msgid_enabled == curr) + goto unlock_ok; + + if (msgid_enabled && + count_extradata_entries(nt) >= MAX_EXTRADATA_ITEMS) { + ret = -ENOSPC; + goto unlock; + } + + if (msgid_enabled) + nt->sysdata_fields |= SYSDATA_MSGID; + else + disable_sysdata_feature(nt, SYSDATA_MSGID); + +unlock_ok: + ret = strnlen(buf, count); +unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return ret; +} + static ssize_t sysdata_release_enabled_store(struct config_item *item, const char *buf, size_t count) { @@ -1037,6 +1084,7 @@ CONFIGFS_ATTR(userdatum_, value); CONFIGFS_ATTR(sysdata_, cpu_nr_enabled); CONFIGFS_ATTR(sysdata_, taskname_enabled); CONFIGFS_ATTR(sysdata_, release_enabled); +CONFIGFS_ATTR(sysdata_, msgid_enabled);
static struct configfs_attribute *userdatum_attrs[] = { &userdatum_attr_value, @@ -1099,6 +1147,7 @@ static struct configfs_attribute *userdata_attrs[] = { &sysdata_attr_cpu_nr_enabled, &sysdata_attr_taskname_enabled, &sysdata_attr_release_enabled, + &sysdata_attr_msgid_enabled, NULL, };