On Fri, 8 Sep 2006 00:59:27 +0400
Alexey Dobriyan <[email protected]> wrote:
> You'd laugh, but...
>
> Summary:
>
> After loading and unloading rd.ko many times "ls -l /dev/ram*"
> results are not persistent.
>
> Steps to reproduce:
>
> # while true; do modprobe rd && rmmod rd; done
> [wait ~10 seconds]
> ^C
> # modprobe rd
>
> # ls -l /dev/ram*
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram12 -> rd/12
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram6 -> rd/6
> # ls -l /dev/ram*
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram0 -> rd/0
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram13 -> rd/13
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram6 -> rd/6
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram7 -> rd/7
> # ls -l /dev/ram*
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram0 -> rd/0
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram1 -> rd/1
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram11 -> rd/11
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram12 -> rd/12
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram14 -> rd/14
> lrwxrwxrwx 1 root root 5 Sep 8 00:35 /dev/ram15 -> rd/15
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram3 -> rd/3
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram7 -> rd/7
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram8 -> rd/8
> lrwxrwxrwx 1 root root 4 Sep 8 00:35 /dev/ram9 -> rd/9
>
> Versions:
>
> Linux 2.6.18-rc5
> udev 087
So I assume udev is still madly crunching on its message backlog while
this is happening?
If so, ug.
> P.S.:
>
> This was noticed while investigating #4899
> http://bugme.osdl.org/show_bug.cgi?id=4899
> where /dev/ram0 when opened, pins module indefinitely. It seems that
> adding ->release() which undoes
>
> inode = igrab(bdev->bd_inode);
>
> should do the trick. Am I right?
Looks right.
I'm not sure that igrab() is needed though. Probably bd_openers is
sufficient.
I'm also not sure that rd_open() needs to play with bd_openers.
fs/block_dev.c:do_open() already does that.
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