On Wed, Jul 04, 2012 at 11:15:32AM +0200, Alain Spineux wrote:

Hi

I'm trying to unregister disks to unload the bcache module and reuse
the disk for other tests.

Can someone tell me how to unload module bcache after having run these command ?

You'd use either unregister or stop (in the various bcache directories,
depending on whether you just wanted to stop/unregister a backing device
or cache set) and then you ought to be able to rmmod it.

I should test that though, I wouldn't be surprised if something isn't
completely working.

Thanks.

#first load module
# modprobe bcache

I created a cache device on /dev/sdb1
# ./make-bcache -C -b512k -w4k --writeback /dev/sdb1

and a backing device on /dev/sdz.
# ./make-bcache -B /dev/sdz

# ./probe-bcache /dev/sdb1
5f42bdd1-4342-4ab6-8dda-855989a09604: UUID="" TYPE="bcache"

# ./probe-bcache /dev/sdz
6bbac9a4-afbd-4d40-9562-cdd290622c5d: UUID="" TYPE="bcache"


I then registered them by:
# echo /dev/sdb1 >/sys/fs/bcache/register
# echo /dev/sdz  >/sys/fs/bcache/register

I have /dev/bcache0.
/dev/bcache0 maps /dev/sdz except the first blocks
/dev/bcache0 is not yet cached by anything

# ls /sys/fs/bcache/
887d3bb6-0161-4e54-b9d8-801de9f7df83  register  register_quiet

"887d3bb6-0161-4e54-b9d8-801de9f7df83"
is the id of the bcache "pool" composed by the only caching device /dev/sdb1

# now I attach /dev/sdz to this pool
echo "887d3bb6-0161-4e54-b9d8-801de9f7df83" > /sys/block/sdz/bcache/attach



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