NeilBrown 2c810cddc4 md: allow a reshape operation to be reversed. ... Currently a reshape operation always progresses from the start of the array to the end unless the number of devices is being reduced, in which case it progressed in the opposite direction. To reverse a partial reshape which changes the number of devices you can stop the array and re-assemble with the raid-disks numbers reversed and it will undo. However for a reshape that does not change the number of devices it is not possible to reverse the reshape in the middle - you have to wait until it completes. So add a 'reshape_direction' attribute with is either 'forwards' or 'backwards' and can be explicitly set when delta_disks is zero. This will become more important when we allow the data_offset to change in a reshape. Then the explicit statement of what direction is being used will be more useful. This can be enabled in raid5 trivially as it already supports reverse reshape and just needs to use a different trigger to request it. Signed-off-by: NeilBrown <neilb@suse.de>		2012-05-21 09:27:00 +10:00
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Kbuild
md_p.h	md: allow a reshape operation to be reversed.	2012-05-21 09:27:00 +10:00
md_u.h
pq.h	md: Fix userspace free_pages() macro	2011-12-23 10:17:51 +11:00
xor.h