btrfs: add multi-statement protection to btrfs_set/clear_and_info macros

Multi-statement macros should be enclosed in do/while(0) block to make
their use safe in single statement if conditions. All current uses of
the macros are safe, so this change is for future protection.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c083628..7a4ce88 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1279,18 +1279,18 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
                                         BTRFS_MOUNT_##opt)
 
 #define btrfs_set_and_info(fs_info, opt, fmt, args...)                 \
-{                                                                      \
+do {                                                                   \
        if (!btrfs_test_opt(fs_info, opt))                              \
                btrfs_info(fs_info, fmt, ##args);                       \
        btrfs_set_opt(fs_info->mount_opt, opt);                         \
-}
+} while (0)
 
 #define btrfs_clear_and_info(fs_info, opt, fmt, args...)               \
-{                                                                      \
+do {                                                                   \
        if (btrfs_test_opt(fs_info, opt))                               \
                btrfs_info(fs_info, fmt, ##args);                       \
        btrfs_clear_opt(fs_info->mount_opt, opt);                       \
-}
+} while (0)
 
 /*
  * Requests for changes that need to be done during transaction commit.