From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 13 Apr 2012 15:49:04 +0000 (-0400)
Subject: btrfs: btrfs_root_readonly() broken on big-endian
X-Git-Tag: v3.3.4~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0f97b2f7316b31570474f501cfc82aaa043b541;p=thirdparty%2Fkernel%2Fstable.git

btrfs: btrfs_root_readonly() broken on big-endian

commit 6ed3cf2cdfce4c9f1d73171bd3f27d9cb77b734e upstream.

->root_flags is __le64 and all accesses to it go through the helpers
that do proper conversions.  Except for btrfs_root_readonly(), which
checks bit 0 as in host-endian...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 80b6486fd5e64..91128d7e9d391 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2115,7 +2115,7 @@ BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
 
 static inline bool btrfs_root_readonly(struct btrfs_root *root)
 {
-	return root->root_item.flags & BTRFS_ROOT_SUBVOL_RDONLY;
+	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
 }
 
 /* struct btrfs_root_backup */