rbd: update capacity in rbd_dev_refresh()
authorAlex Elder <elder@inktank.com>
Mon, 6 May 2013 12:40:30 +0000 (07:40 -0500)
committerAlex Elder <elder@inktank.com>
Wed, 8 May 2013 12:45:30 +0000 (07:45 -0500)
commit00a653e216a8427547774ab3f2cc92709c3e28c9
tree0fcefd1576f7906ef3643b4f92f808b9a05af7af
parente627db085e0dab7744b68f3c927be6ed6df2f7f9
rbd: update capacity in rbd_dev_refresh()

When a mapped image changes size, we change the capacity recorded
for the Linux disk associated with it, in rbd_update_mapping_size().
That function is called in two places--the format 1 and format 2
refresh routines.

There is no need to set the capacity while holding the header
semaphore.  Instead, do it in the common rbd_dev_refresh(), using
the logic that's already there to initiate disk revalidation.

Add handling in the request function, just in case a request
that exceeds the capacity of the device comes in (perhaps one
that was started before a refresh shrunk the device).

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
drivers/block/rbd.c