This patch adds support for the two linux interfaces of the discard/TRIM
command for SSD devices and sparse/thinly-provisioned LUNs.

JFS will support batched discard via FITRIM ioctl and online discard
with the discard mount option.

I also think that a short description of the FITRIM ioctl should it made
into Documetation/ioctl/fitrim.txt - but that would be part of some
other patch. Maybe from Lukas Czerner?

For the online discard, you can also specify the minimum number of
blocks. Everything of it is described in
Documentation/filesystems/jfs.txt... so I am not writing it again in
that mail.

So than, maybe some other can stress-test JFS on some SSD as well?


Signed-off-by: Tino Reichardt <list-jfs@mcmilk.de>

PS: Sorry for my bad english ;)

-- 
regards, TR