From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 11 Sep 2009 16:33:12 +0000 (-0400)
Subject: Btrfs: fix btrfs page_mkwrite to return locked page
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=50a9b214bc6c052caa05a210ebfc1bdf0d7085b2;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

Btrfs: fix btrfs page_mkwrite to return locked page

This closes a whole where the page may be written before
the page_mkwrite caller has a chance to dirty it

(thanks to Nick Piggin)

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 233fe6f2612..c846482e798 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4552,11 +4552,14 @@ again:
 	}
 	ClearPageChecked(page);
 	set_page_dirty(page);
+	SetPageUptodate(page);
 
 	BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
 	unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
 
 out_unlock:
+	if (!ret)
+		return VM_FAULT_LOCKED;
 	unlock_page(page);
 out:
 	return ret;