* rd.o module refcount problem
@ 2003-05-29 10:25 Maneesh Soni
2003-05-29 10:35 ` Russell King
0 siblings, 1 reply; 2+ messages in thread
From: Maneesh Soni @ 2003-05-29 10:25 UTC (permalink / raw)
To: LKML; +Cc: axobe, Rusty
The module ref count for rd.o module is not adjusted and remains 1 while doing
the following things.
[root@llm01 mod]# insmod /sdb/linux-2.5.70/drivers/block/rd.o
[root@llm01 mod]# lsmod
Module Size Used by
rd 5568 0 - Live 0xf88b5000
[root@llm01 mod]# mkfs -t ext2 /dev/ram0
.
.
[root@llm01 mod]# lsmod
Module Size Used by
rd 5568 1 - Live 0xf88b5000
mount/umount of /dev/ram0 does not change the rd.o module ref count.
So, who is supposed to release the rd.o module gracefully?
Also mount /dev/ram0 should hold a ref and umount should release the same.
Same test on 2.4.20 looks correct and mount increments the ref count and
umount decrements the ref count.
Regards,
Maneesh
--
Maneesh Soni
IBM Linux Technology Center,
IBM India Software Lab, Bangalore.
Phone: +91-80-5044999 email: maneesh@in.ibm.com
http://lse.sourceforge.net/
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: rd.o module refcount problem
2003-05-29 10:25 rd.o module refcount problem Maneesh Soni
@ 2003-05-29 10:35 ` Russell King
0 siblings, 0 replies; 2+ messages in thread
From: Russell King @ 2003-05-29 10:35 UTC (permalink / raw)
To: Maneesh Soni; +Cc: LKML, axobe, Rusty
On Thu, May 29, 2003 at 03:55:10PM +0530, Maneesh Soni wrote:
> The module ref count for rd.o module is not adjusted and remains 1 while
> doing the following things.
>
> [root@llm01 mod]# insmod /sdb/linux-2.5.70/drivers/block/rd.o
> [root@llm01 mod]# lsmod
> Module Size Used by
> rd 5568 0 - Live 0xf88b5000
> [root@llm01 mod]# mkfs -t ext2 /dev/ram0
> .
> .
> [root@llm01 mod]# lsmod
> Module Size Used by
> rd 5568 1 - Live 0xf88b5000
>
> mount/umount of /dev/ram0 does not change the rd.o module ref count.
>
> So, who is supposed to release the rd.o module gracefully?
> Also mount /dev/ram0 should hold a ref and umount should release the same.
>
> Same test on 2.4.20 looks correct and mount increments the ref count and
> umount decrements the ref count.
I think you'll find you have to tell the ramdisk to invalidate its contents
before the module count drops.
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
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