tree 5789fa005f94911bc6a92a6cb8700b8025a3adc4
parent 7ca78d57d11a91bc93b35342fa58647b85bedeb1
author NeilBrown <neilb@suse.de> 1305089479 +1000
committer NeilBrown <neilb@suse.de> 1305089479 +1000

md/raid1: improve handling of pages allocated for write-behind.

The current handling and freeing of these pages is a bit fragile.
We only keep the list of allocated pages in each bio, so we need to
still have a valid bio when freeing the pages, which is a bit clumsy.

So simply store the allocated page list in the r1_bio so it can easily
be found and freed when we are finished with the r1_bio.

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