[PATCH 6/6] ubifs: Wait for page writeback to provide stable pages

[Darrick J. Wong]

When stable pages are required, we have to wait if the page is just
going to disk and we want to modify it. Add proper callback to
ubifs_vm_page_mkwrite().

CC: Artem Bityutskiy <dedekind1 at gmail.com>
CC: Adrian Hunter <adrian.hunter at intel.com>
CC: linux-mtd at lists.infradead.org
From: Jan Kara <jack at suse.cz>
Signed-off-by: Jan Kara <jack at suse.cz>
Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 fs/ubifs/file.c |    1 +
 1 file changed, 1 insertion(+)


diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 5bc7781..4f6493c 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1522,6 +1522,7 @@ static int ubifs_vm_page_mkwrite(struct vm_area_struct *vma,
 			ubifs_release_dirty_inode_budget(c, ui);
 	}
 
+	wait_for_stable_page(page);
 	unlock_page(page);
 	return 0;