tree 14f9fd4ef0299f16274ce2980baef7b96f111bea
parent ac81b2ee45eb811fdb0aa1cfb71d468d944d00ce
author NeilBrown <neilb@suse.de> 1136535612 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136565241 -0800

[PATCH] md: improve raid1 "IO Barrier" concept

raid1 needs to put up a barrier to new requests while it does resync or other
background recovery.  The code for this is currently open-coded, slighty
obscure by its use of two waitqueues, and not documented.

This patch gathers all the related code into 4 functions, and includes a
comment which (hopefully) explains what is happening.

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