tree 3469e56a27837bfe7a01a399baccc90579e46ef6
parent 33e38ac6887d975fe2635c7fcaefb6d5495cb2e1
author Goldwyn Rodrigues <rgoldwyn@suse.com> 1435156232 -0500
committer NeilBrown <neilb@suse.com> 1437709079 +1000

Fix read-balancing during node failure

During a node failure, We need to suspend read balancing so that the
reads are directed to the first device and stale data is not read.
Suspending writes is not required because these would be recorded and
synced eventually.

A new flag MD_CLUSTER_SUSPEND_READ_BALANCING is set in recover_prep().
area_resyncing() will respond true for the entire devices if this
flag is set and the request type is READ. The flag is cleared
in recover_done().

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reported-By: David Teigland <teigland@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>