btrfs: reduce nesting for extent processing at btrfs_lookup_extent_info()

[ Upstream commit 5c83b3beaee06aa88d4015408ac2d8bb35380b06 ]

Instead of using an if-else statement when processing the extent item at
btrfs_lookup_extent_info(), use a single if statement for the error case
since it does a goto at the end and leave the success (expected) case
following the if statement, reducing indentation and making the logic a
bit easier to follow. Also make the if statement's condition as unlikely
since it's not expected to ever happen, as it signals some corruption,
making it clear and hint the compiler to generate more efficient code.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 153297cb97a4aa7e7136fa61a52b0b3a36759eca..844b677d054ec8cd56ef2e6e8537e88d715df103 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -104,10 +104,7 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
        struct btrfs_delayed_ref_head *head;
        struct btrfs_delayed_ref_root *delayed_refs;
        struct btrfs_path *path;
-       struct btrfs_extent_item *ei;
-       struct extent_buffer *leaf;
        struct btrfs_key key;
-       u32 item_size;
        u64 num_refs;
        u64 extent_flags;
        u64 owner = 0;
@@ -157,16 +154,11 @@ search_again:
        }
 
        if (ret == 0) {
-               leaf = path->nodes[0];
-               item_size = btrfs_item_size(leaf, path->slots[0]);
-               if (item_size >= sizeof(*ei)) {
-                       ei = btrfs_item_ptr(leaf, path->slots[0],
-                                           struct btrfs_extent_item);
-                       num_refs = btrfs_extent_refs(leaf, ei);
-                       extent_flags = btrfs_extent_flags(leaf, ei);
-                       owner = btrfs_get_extent_owner_root(fs_info, leaf,
-                                                           path->slots[0]);
-               } else {
+               struct extent_buffer *leaf = path->nodes[0];
+               struct btrfs_extent_item *ei;
+               const u32 item_size = btrfs_item_size(leaf, path->slots[0]);
+
+               if (unlikely(item_size < sizeof(*ei))) {
                        ret = -EUCLEAN;
                        btrfs_err(fs_info,
                        "unexpected extent item size, has %u expect >= %zu",
@@ -179,6 +171,10 @@ search_again:
                        goto out_free;
                }
 
+               ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
+               num_refs = btrfs_extent_refs(leaf, ei);
+               extent_flags = btrfs_extent_flags(leaf, ei);
+               owner = btrfs_get_extent_owner_root(fs_info, leaf, path->slots[0]);
                BUG_ON(num_refs == 0);
        } else {
                num_refs = 0;