md/bitmap: separate bitmap file allocation to its own function.
authorNeilBrown <neilb@suse.de>
Tue, 22 May 2012 03:55:12 +0000 (13:55 +1000)
committerNeilBrown <neilb@suse.de>
Tue, 22 May 2012 03:55:12 +0000 (13:55 +1000)
This will allow allocation before swapping in a new bitmap.

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

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