Add configfs interface to enable/disable the taskname sysdata feature. This adds the following functionality:
The implementation follows the same pattern as the existing CPU number feature, ensuring consistent behavior and error handling across sysdata features.
Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Simon Horman horms@kernel.org --- drivers/net/netconsole.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index f46a0edf9c11e..9798b2b409e26 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -426,6 +426,20 @@ static ssize_t sysdata_cpu_nr_enabled_show(struct config_item *item, char *buf) return sysfs_emit(buf, "%d\n", cpu_nr_enabled); }
+/* configfs helper to display if taskname sysdata feature is enabled */ +static ssize_t sysdata_taskname_enabled_show(struct config_item *item, + char *buf) +{ + struct netconsole_target *nt = to_target(item->ci_parent); + bool taskname_enabled; + + mutex_lock(&dynamic_netconsole_mutex); + taskname_enabled = !!(nt->sysdata_fields & SYSDATA_TASKNAME); + mutex_unlock(&dynamic_netconsole_mutex); + + return sysfs_emit(buf, "%d\n", taskname_enabled); +} + /* * This one is special -- targets created through the configfs interface * are not enabled (and the corresponding netpoll activated) by default. @@ -841,6 +855,40 @@ static void disable_sysdata_feature(struct netconsole_target *nt, nt->extradata_complete[nt->userdata_length] = 0; }
+static ssize_t sysdata_taskname_enabled_store(struct config_item *item, + const char *buf, size_t count) +{ + struct netconsole_target *nt = to_target(item->ci_parent); + bool taskname_enabled, curr; + ssize_t ret; + + ret = kstrtobool(buf, &taskname_enabled); + if (ret) + return ret; + + mutex_lock(&dynamic_netconsole_mutex); + curr = !!(nt->sysdata_fields & SYSDATA_TASKNAME); + if (taskname_enabled == curr) + goto unlock_ok; + + if (taskname_enabled && + count_extradata_entries(nt) >= MAX_EXTRADATA_ITEMS) { + ret = -ENOSPC; + goto unlock; + } + + if (taskname_enabled) + nt->sysdata_fields |= SYSDATA_TASKNAME; + else + disable_sysdata_feature(nt, SYSDATA_TASKNAME); + +unlock_ok: + ret = strnlen(buf, count); +unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return ret; +} + /* configfs helper to sysdata cpu_nr feature */ static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item, const char *buf, size_t count) @@ -886,6 +934,7 @@ static ssize_t sysdata_cpu_nr_enabled_store(struct config_item *item,
CONFIGFS_ATTR(userdatum_, value); CONFIGFS_ATTR(sysdata_, cpu_nr_enabled); +CONFIGFS_ATTR(sysdata_, taskname_enabled);
static struct configfs_attribute *userdatum_attrs[] = { &userdatum_attr_value, @@ -946,6 +995,7 @@ static void userdatum_drop(struct config_group *group, struct config_item *item)
static struct configfs_attribute *userdata_attrs[] = { &sysdata_attr_cpu_nr_enabled, + &sysdata_attr_taskname_enabled, NULL, };