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netconsole: add configfs controls for taskname sysdata feature

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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>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Breno Leitao 2025-02-28 04:50:21 -08:00 committed by Paolo Abeni
parent 33e4b29f2b
commit 09e877590b
1 changed files with 50 additions and 0 deletions
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50
drivers/net/netconsole.c
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@ -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,
};