From b578d55fdd80140f657130abd85aebeb345755fb Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Mon, 27 Mar 2006 01:18:12 -0800
Subject: [PATCH] md: Only checkpoint expansion progress occasionally
Instead of checkpointing at each stripe, only checkpoint when a new write
would overwrite uncheckpointed data. Block any write to the uncheckpointed
area. Arbitrarily checkpoint at least every 3Meg.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
include/linux/raid/raid5.h | 3 +++
1 file changed, 3 insertions(+)
(limited to 'include/linux')
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index abcdf0d0658..914af667044 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -217,6 +217,9 @@ struct raid5_private_data {
/* used during an expand */
sector_t expand_progress; /* MaxSector when no expand happening */
+ sector_t expand_lo; /* from here up to expand_progress it out-of-bounds
+ * as we haven't flushed the metadata yet
+ */
int previous_raid_disks;
struct list_head handle_list; /* stripes needing handling */
--
cgit