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netconsole: implement configfs for release_enabled

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Implement the configfs helpers to show and set release_enabled configfs
directories under userdata.

When enabled, set the feature bit in netconsole_target->sysdata_fields.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250314-netcons_release-v1-2-07979c4b86af@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Breno Leitao
2025-03-14 10:58:46 -07:00
committed by Paolo Abeni
parent 42211e3107
commit 343f902270
1 changed files with 49 additions and 0 deletions
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49
drivers/net/netconsole.c
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@@ -442,6 +442,19 @@ static ssize_t sysdata_taskname_enabled_show(struct config_item *item,
return sysfs_emit(buf, "%d\n", taskname_enabled);
}
static ssize_t sysdata_release_enabled_show(struct config_item *item,
char *buf)
{
struct netconsole_target *nt = to_target(item->ci_parent);
bool release_enabled;
mutex_lock(&dynamic_netconsole_mutex);
release_enabled = !!(nt->sysdata_fields & SYSDATA_TASKNAME);
mutex_unlock(&dynamic_netconsole_mutex);
return sysfs_emit(buf, "%d\n", release_enabled);
}
/*
* This one is special -- targets created through the configfs interface
* are not enabled (and the corresponding netpoll activated) by default.
@@ -859,6 +872,40 @@ static void disable_sysdata_feature(struct netconsole_target *nt,
nt->extradata_complete[nt->userdata_length] = 0;
}
static ssize_t sysdata_release_enabled_store(struct config_item *item,
const char *buf, size_t count)
{
struct netconsole_target *nt = to_target(item->ci_parent);
bool release_enabled, curr;
ssize_t ret;
ret = kstrtobool(buf, &release_enabled);
if (ret)
return ret;
mutex_lock(&dynamic_netconsole_mutex);
curr = !!(nt->sysdata_fields & SYSDATA_RELEASE);
if (release_enabled == curr)
goto unlock_ok;
if (release_enabled &&
count_extradata_entries(nt) >= MAX_EXTRADATA_ITEMS) {
ret = -ENOSPC;
goto unlock;
}
if (release_enabled)
nt->sysdata_fields |= SYSDATA_RELEASE;
else
disable_sysdata_feature(nt, SYSDATA_RELEASE);
unlock_ok:
ret = strnlen(buf, count);
unlock:
mutex_unlock(&dynamic_netconsole_mutex);
return ret;
}
static ssize_t sysdata_taskname_enabled_store(struct config_item *item,
const char *buf, size_t count)
{
@@ -939,6 +986,7 @@ 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);
CONFIGFS_ATTR(sysdata_, release_enabled);
static struct configfs_attribute *userdatum_attrs[] = {
&userdatum_attr_value,
@@ -1000,6 +1048,7 @@ 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,
&sysdata_attr_release_enabled,
NULL,
};