LVM2+udev+multipath-tools error: can't create runfile

[PT_LAmb]

Hi,

I use LVM2 to manage all but my swap and root partitions based on The Gentoo LVM2 Installation Guide. Here's mount's output.

/dev/hda7 on / type reiserfs (rw,noatime)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
udev on /dev type tmpfs (rw,nosuid)
devpts on /dev/pts type devpts (rw)
/dev/vga/var on /var type reiserfs (rw,noatime)
/dev/vga/tmp on /tmp type reiserfs (rw,noatime)
/dev/vga/usr on /usr type reiserfs (rw,noatime)
/dev/vga/opt on /opt type reiserfs (rw,noatime)
/dev/vga/home on /home type reiserfs (rw,noatime)
/dev/vga/ccache on /var/tmp/ccache type reiserfs (rw,noatime)
/dev/vga/iso on /mnt/iso type reiserfs (rw,noatime)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
none on /proc/bus/usb type usbfs (rw)
none on /dev/shm type tmpfs (rw)

I migrated my system from devfs to udev yesterday, and during the first boot, I got 20+ error lines.

* Populating /dev with device nodes ...
device mapper prerequisites not met.
device mapper prerequisites not met.
device mapper prerequisites not met.
device mapper prerequisites not met.
...

After searching in multipath-tools' source code, I found that I had to compile Device Mapper Support and Multipath Target built in the kernel. I did it and rebooted to find that the error was replaced by another.

* Populating /dev with device nodes ...
can't create runfile
can't create runfile
can't create runfile
can't create runfile
...

I tweaked multipath/main.c and added a perror("") line right after fprintf(stderr, "can't create runfile\n");.

Code: Select all

 int try_lock (char * file)
{
        int fd;
        struct flock fl;

        /*
         * create the file to lock if it does not exist
         */
        fd = open(file, O_CREAT|O_RDWR);

        if (fd < 0) {
                fprintf(stderr, "can't create runfile\n");
                perror();
                exit(1);
        }
...

Hence that file == "/var/run/multipath.run"

As /var is a separated partition, I bound /root/newroot to / with mount / -o bind ~/newroot and checked that /var/run/multipath.run was present.

milk linux # ls -la /root/newroot/var/run/
total 0
drwxr-xr-x 2 root root 80 Aug 23 19:11 .
drwxr-xr-x 5 root root 120 Aug 22 19:02 ..
---s--xr-T 1 root root 0 Aug 23 19:11 multipath.run
milk linux #

deleted it and rebooted the system...

* Populating /dev with device nodes ...
can't create runfile
Read-only filesystem
can't create runfile
Read-only filesystem
can't create runfile
Read-only filesystem
can't create runfile
Read-only filesystem
...

I find that this error is wierd because multipath.run was again present in /var/run.

I just don't know what's happening. If someone could give me a hint, or tell me what else to check, I would be every gratefull.

Should I file this as a bug?

Thanks in advance,
Ricardo