tree e2d8dc88c99ecc14d6d87596d95b3de9b9dc87c9
parent 96c3fd1f3802371610c620cff03f9d825707e80e
author NeilBrown <neilb@suse.de> 1324595874 +1100
committer NeilBrown <neilb@suse.de> 1324595874 +1100

md/raid10: preferentially read from replacement device if possible.

When reading (for array reads, not for recovery etc) we read from the
replacement device if it has recovered far enough.
This requires storing the chosen rdev in the 'r10_bio' so we can make
sure to drop the ref on the right device when the read finishes.

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