tree 777abdad9c9ef10cb4df5c0efc736e6c64851ed8
parent c303da6d713b87b7b3f999f5acce8ecc76ff1adb
author NeilBrown <neilb@suse.de> 1202290792 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1202323278 -0800

md: allow a maximum extent to be set for resyncing

This allows userspace to control resync/reshape progress and synchronise it
with other activities, such as shared access in a SAN, or backing up critical
sections during a tricky reshape.

Writing a number of sectors (which must be a multiple of the chunk size if
such is meaningful) causes a resync to pause when it gets to that point.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>