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: firefly_0821_release~7541^2~1302
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=025a55c8acd5b796af80305a800b343bb51c8f0c;p=firefly-linux-kernel-4.4.55.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 3b859a3e6a0e..66179bcb16f6 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1972,7 +1972,7 @@ 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_super_block */