btrfs: parent_start initialization cleanup

Code cleanup. parent_start is initialized multiple times when it is
not necessary to do so.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 0c910b1..284cc9d 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1100,7 +1100,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
        int level, ret;
        int last_ref = 0;
        int unlock_orig = 0;
-       u64 parent_start;
+       u64 parent_start = 0;
 
        if (*cow_ret == buf)
                unlock_orig = 1;
@@ -1119,13 +1119,8 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
        else
                btrfs_node_key(buf, &disk_key, 0);
 
-       if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
-               if (parent)
-                       parent_start = parent->start;
-               else
-                       parent_start = 0;
-       } else
-               parent_start = 0;
+       if ((root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) && parent)
+               parent_start = parent->start;
 
        cow = btrfs_alloc_tree_block(trans, root, parent_start,
                        root->root_key.objectid, &disk_key, level,
@@ -1168,8 +1163,6 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
                    btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
                        parent_start = buf->start;
-               else
-                       parent_start = 0;
 
                extent_buffer_get(cow);
                tree_mod_log_set_root_pointer(root, cow, 1);
@@ -1180,11 +1173,6 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                free_extent_buffer(buf);
                add_root_to_dirty_list(root);
        } else {
-               if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
-                       parent_start = parent->start;
-               else
-                       parent_start = 0;
-
                WARN_ON(trans->transid != btrfs_header_generation(parent));
                tree_mod_log_insert_key(root->fs_info, parent, parent_slot,
                                        MOD_LOG_KEY_REPLACE, GFP_NOFS);