tree 1c5cab0e89ae466be9edb476ceb91e5c898fafa6
parent 624ce4f5658fa3e0303c1217bba2706142fe7568
author NeilBrown <neilb@suse.de> 1260755396 +1100
committer NeilBrown <neilb@suse.de> 1260755501 +1100

md: Support write-intent bitmaps with externally managed metadata.

In this case, the metadata needs to not be in the same
sector as the bitmap.
md will not read/write any bitmap metadata.  Config must be
done via sysfs and when a recovery makes the array non-degraded
again, writing 'true' to 'bitmap/can_clear' will allow bits in
the bitmap to be cleared again.

Signed-off-by: NeilBrown <neilb@suse.de>