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[PATCH] add uevent_helper control in /sys/kernel/ 

This deprecates the /proc/sys/kernel/hotplug file, as all
this stuff should be in /sys some day, right? :)
In /sys/kernel/ we have now uevent_seqnum and uevent_helper.
The seqnum is no longer used by udev, as the version for this
kernel depends on netlink which events will never get
out-of-order.

Recent udev versions disable the /sbin/hotplug helper with
an init script, cause it leads to OOM on big boxes by running
hundreds of shells in parallel. It should be done now by:
  echo "" > /sys/kernel/uevent_helper

(Note that "-n" does not work, cause neighter proc nor sysfs
support truncate().)

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
wifi-calibration
Kay Sievers 2005-11-11 04:58:04 +01:00 committed by Greg Kroah-Hartman
parent 0296b22813
commit 0f76e5acf9
1 changed files with 22 additions and 3 deletions
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25
kernel/ksysfs.c
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@ -23,11 +23,29 @@ static struct subsys_attribute _name##_attr = \
__ATTR(_name, 0644, _name##_show, _name##_store)
#ifdef CONFIG_HOTPLUG
static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page)
/* current uevent sequence number */
static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
}
KERNEL_ATTR_RO(hotplug_seqnum);
KERNEL_ATTR_RO(uevent_seqnum);
/* uevent helper program, used during early boo */
static ssize_t uevent_helper_show(struct subsystem *subsys, char *page)
{
return sprintf(page, "%s\n", hotplug_path);
}
static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count)
{
if (count+1 > HOTPLUG_PATH_LEN)
return -ENOENT;
memcpy(hotplug_path, page, count);
hotplug_path[count] = '\0';
if (count && hotplug_path[count-1] == '\n')
hotplug_path[count-1] = '\0';
return count;
}
KERNEL_ATTR_RW(uevent_helper);
#endif
#ifdef CONFIG_KEXEC
@ -45,7 +63,8 @@ EXPORT_SYMBOL_GPL(kernel_subsys);
static struct attribute * kernel_attrs[] = {
#ifdef CONFIG_HOTPLUG
&hotplug_seqnum_attr.attr,
&uevent_seqnum_attr.attr,
&uevent_helper_attr.attr,
#endif
#ifdef CONFIG_KEXEC
&crash_notes_attr.attr,