From: David Chinner <dgc@sgi.com>
Date: Wed, 20 Dec 2006 23:24:01 +0000 (+1100)
Subject: [PATCH] Fix XFS after clear_page_dirty() removal
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=921320210bd2ec4f17053d283355b73048ac0e56;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] Fix XFS after clear_page_dirty() removal

XFS appears to call clear_page_dirty to get the mapping tree dirty tag
set correctly at the same time the page dirty flag is cleared.  I note
that this can be done by set_page_writeback() if we clear the dirty flag
on the page first when we are writing back the entire page.

Hence it seems to me that the XFS call to clear_page_dirty() could
easily be substituted by clear_page_dirty_for_io() followed by a call to
set_page_writeback() to get the mapping tree tags set correctly after
the page has been marked clean.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index b56eb754e2d2..7b54461695e2 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -341,9 +341,9 @@ xfs_start_page_writeback(
 {
 	ASSERT(PageLocked(page));
 	ASSERT(!PageWriteback(page));
-	set_page_writeback(page);
 	if (clear_dirty)
-		clear_page_dirty(page);
+		clear_page_dirty_for_io(page);
+	set_page_writeback(page);
 	unlock_page(page);
 	if (!buffers) {
 		end_page_writeback(page);