[PATCH] md: make sure the events count in an md array never returns to zero
commit1031be7a5fafd3a858dfaabb74d98f9ca20744a8
authorNeilBrown <neilb@suse.de>
Fri, 26 Jan 2007 08:57:02 +0000 (26 00:57 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 26 Jan 2007 21:50:59 +0000 (26 13:50 -0800)
treeb111bc6880571e3ad0720da828a029ecae066c8a
parent3eda22d19b76b15ef3420b251bd47a0ba0127589
[PATCH] md: make sure the events count in an md array never returns to zero

Now that we sometimes step the array events count backwards (when
transitioning dirty->clean where nothing else interesting has happened - so
that we don't need to write to spares all the time), it is possible for the
event count to return to zero, which is potentially confusing and triggers and
MD_BUG.

We could possibly remove the MD_BUG, but is just as easy, and probably safer,
to make sure we never return to zero.

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