Btrfs: add tree_mod_dont_log helper

Replace duplicate code by small inline helper function.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 26e8dc1..c7c4848 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -455,14 +455,25 @@ unlock:
        return ret;
 }
 
+static inline int tree_mod_dont_log(struct btrfs_fs_info *fs_info,
+                                   struct extent_buffer *eb) {
+       smp_mb();
+       if (list_empty(&(fs_info)->tree_mod_seq_list))
+               return 1;
+       if (!eb)
+               return 0;
+       if (btrfs_header_level(eb) == 0)
+               return 1;
+       return 0;
+}
+
 static inline int tree_mod_alloc(struct btrfs_fs_info *fs_info, gfp_t flags,
                                 struct tree_mod_elem **tm_ret)
 {
        struct tree_mod_elem *tm;
        int seq;
 
-       smp_mb();
-       if (list_empty(&fs_info->tree_mod_seq_list))
+       if (tree_mod_dont_log(fs_info, NULL))
                return 0;
 
        tm = *tm_ret = kzalloc(sizeof(*tm), flags);
@@ -643,8 +654,7 @@ tree_mod_log_eb_copy(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
        int ret;
        int i;
 
-       smp_mb();
-       if (list_empty(&fs_info->tree_mod_seq_list))
+       if (tree_mod_dont_log(fs_info, NULL))
                return;
 
        if (btrfs_header_level(dst) == 0 && btrfs_header_level(src) == 0)
@@ -691,11 +701,7 @@ static void tree_mod_log_free_eb(struct btrfs_fs_info *fs_info,
        int ret;
        u32 nritems;
 
-       smp_mb();
-       if (list_empty(&fs_info->tree_mod_seq_list))
-               return;
-
-       if (btrfs_header_level(eb) == 0)
+       if (tree_mod_dont_log(fs_info, eb))
                return;
 
        nritems = btrfs_header_nritems(eb);