From: NeilBrown <neilb@suse.de>
Date: Fri, 6 Jan 2006 08:20:45 +0000 (-0800)
Subject: [PATCH] md: make sure bitmap updates are visible through filesystem
X-Git-Tag: v2.6.16-rc1~936^2~17
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=c708443c004f2310abdd7f1c353daa372b37f7a2;p=~shefty%2Frdma-dev.git

[PATCH] md: make sure bitmap updates are visible through filesystem

When we update a page_cache page in the kernel, we need to flush_dache_page or
userspace might not see the change.

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

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ee4a3424a8a..76a189ceb52 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -315,6 +315,8 @@ static int write_page(struct bitmap *bitmap, struct page *page, int wait)
 	if (bitmap->file == NULL)
 		return write_sb_page(bitmap->mddev, bitmap->offset, page, wait);
 
+	flush_dcache_page(page); /* make sure visible to anyone reading the file */
+
 	if (wait)
 		lock_page(page);
 	else {