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udev: kernel cmdline - accept rd.* parameters

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This commit is contained in:
Kay Sievers 2012-06-04 22:46:32 +02:00
parent f96096dbbf
commit e6f86cac16
2 changed files with 47 additions and 33 deletions
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4
man/systemd-udevd.xml
View File

@ -116,20 +116,24 @@
<refsect1><title>Kernel command line</title>
<variablelist>
<para>The parameters starting with "rd.", will be read when udev is used in an initrd.</para>
<varlistentry>
<term><varname>udev.log-priority=</varname></term>
<term><varname>rd.udev.log-priority=</varname></term>
<listitem>
<para>Set the logging priority.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>udev.children-max=</varname></term>
<term><varname>rd.udev.children-max=</varname></term>
<listitem>
<para>Limit the number of parallel executed events.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>udev.exec-delay=</varname></term>
<term><varname>rd.udev.exec-delay=</varname></term>
<listitem>
<para>Number of seconds to delay the execution of RUN instructions.
This might be useful when debugging system crashes during coldplug

76
src/udev/udevd.c
View File

@ -1013,6 +1013,48 @@ static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
return 0;
}
/*
* read the kernel commandline, in case we need to get into debug mode
* udev.log-priority=<level> syslog priority
* udev.children-max=<number of workers> events are fully serialized if set to 1
* udev.exec-delay=<number of seconds> delay execution of every executed program
*/
static void kernel_cmdline_options(struct udev *udev)
{
char *line, *w, *state;
size_t l;
if (read_one_line_file("/proc/cmdline", &line) < 0)
return;
FOREACH_WORD_QUOTED(w, l, line, state) {
char *s, *opt;
s = strndup(w, l);
if (!s)
break;
/* accept the same options for the initrd, prefixed with "rd." */
if (in_initrd() && startswith(s, "rd."))
opt = s + 3;
else
opt = s;
if (startswith(opt, "udev.log-priority="))
udev_set_log_priority(udev, util_log_priority(opt + 18));
if (startswith(opt, "udev.children-max="))
children_max = strtoul(opt + 18, NULL, 0);
if (startswith(opt, "udev.exec-delay="))
exec_delay = strtoul(opt + 16, NULL, 0);
free(s);
}
free(line);
}
int main(int argc, char *argv[])
{
struct udev *udev;
@ -1101,39 +1143,7 @@ int main(int argc, char *argv[])
}
}
/*
* read the kernel commandline, in case we need to get into debug mode
* udev.log-priority=<level> syslog priority
* udev.children-max=<number of workers> events are fully serialized if set to 1
*
*/
f = fopen("/proc/cmdline", "r");
if (f != NULL) {
char cmdline[4096];
if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
char *pos;
pos = strstr(cmdline, "udev.log-priority=");
if (pos != NULL) {
pos += strlen("udev.log-priority=");
udev_set_log_priority(udev, util_log_priority(pos));
}
pos = strstr(cmdline, "udev.children-max=");
if (pos != NULL) {
pos += strlen("udev.children-max=");
children_max = strtoul(pos, NULL, 0);
}
pos = strstr(cmdline, "udev.exec-delay=");
if (pos != NULL) {
pos += strlen("udev.exec-delay=");
exec_delay = strtoul(pos, NULL, 0);
}
}
fclose(f);
}
kernel_cmdline_options(udev);
if (getuid() != 0) {
fprintf(stderr, "root privileges required\n");