tree 69e1c082cb33d19a508c764da613e0c6b5ced27b
parent ffd96e35c16a99fdb490cc5723b8e32135ae5883
author NeilBrown <neilb@suse.de> 1311643189 +1000
committer NeilBrown <neilb@suse.de> 1311643189 +1000

md/raid5: Remove use of sh->lock in sync_request

This is the start of a series of patches to remove sh->lock.

sync_request takes sh->lock before setting STRIPE_SYNCING to ensure
there is no race with testing it in handle_stripe[56].

Instead, use a new flag STRIPE_SYNC_REQUESTED and test it early
in handle_stripe[56] (after getting the same lock) and perform the
same set/clear operations if it was set.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>