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btrfs: Streamline shared ref check in alloc_reserved_tree_block 

Instead of setting "parent" to ref->parent only when dealing with
a shared ref and subsequently performing another check to see
if (parent > 0), check the "node->type" directly and act accordingly.
This makes the code more streamline. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-05-21 12:27:23 +03:00 committed by David Sterba
parent 21ebfbe7e0
commit d4b20733d2
1 changed files with 2 additions and 8 deletions
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10
fs/btrfs/extent-tree.c
View File

@ -8143,17 +8143,11 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_delayed_tree_ref *ref;
u32 size = sizeof(*extent_item) + sizeof(*iref);
u64 num_bytes;
u64 parent;
u64 flags = extent_op->flags_to_set;
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
ref = btrfs_delayed_node_to_tree_ref(node);
if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)
parent = ref->parent;
else
parent = 0;
extent_key.objectid = node->bytenr;
if (skinny_metadata) {
extent_key.offset = ref->level;
@ -8202,11 +8196,11 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
}
if (parent > 0) {
if (node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF));
btrfs_set_extent_inline_ref_type(leaf, iref,
BTRFS_SHARED_BLOCK_REF_KEY);
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
btrfs_set_extent_inline_ref_offset(leaf, iref, ref->parent);
} else {
btrfs_set_extent_inline_ref_type(leaf, iref,
BTRFS_TREE_BLOCK_REF_KEY);