From: NeilBrown <neilb@suse.de>
Date: Fri, 9 Dec 2011 03:27:00 +0000 (+1100)
Subject: md/bitmap: be more consistent when setting new bits in memory bitmap.
X-Git-Tag: next-20111212~39^2~31
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=880adb70938f40a592954db347e6a4a35e0c72da;p=karo-tx-linux.git

md/bitmap: be more consistent when setting new bits in memory bitmap.

For each active region corresponding to a bit in the bitmap with have
a 14bit counter (and some flags).
This counts
   number of active writes + bit in the on-disk bitmap + delay-needed.

The "delay-needed" is because we always want a delay before clearing a
bit.  So the number here is normally number of active writes plus 2.
If there have been no writes for a while, we drop to 1.
If still no writes we clear the bit and drop to 0.

So for consistency, when setting bit from the on-disk bitmap or by
request from user-space it is best to set the counter to '2' to start
with.

In particular we might also set the NEEDED_MASK flag at this time, and
in all other cases NEEDED_MASK is only set when the counter is 2 or
more.

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index b6907118283a..7a43f76ecf63 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1590,7 +1590,7 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
 	}
 	if (!*bmc) {
 		struct page *page;
-		*bmc = 1 | (needed ? NEEDED_MASK : 0);
+		*bmc = 2 | (needed ? NEEDED_MASK : 0);
 		bitmap_count_page(bitmap, offset, 1);
 		page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap));
 		set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);