[PATCH v2 2/2] btrfs: simplify boolean argument for btrfs_{inc,dec}_ref

[Sun YangKai <sunk67188@gmail.com>]

Replace open-coded if/else blocks with the boolean directly and introduce
local const bool variables, making the code shorter and easier to read.

No functional change.

Signed-off-by: Sun YangKai <sunk67188@gmail.com>
---
 fs/btrfs/ctree.c       | 38 ++++++++++++--------------------------
 fs/btrfs/extent-tree.c | 17 +++++------------
 2 files changed, 17 insertions(+), 38 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 1b15cef86cbc..300fd8c16ad7 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -249,6 +249,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 	int ret = 0;
 	int level;
 	struct btrfs_disk_key disk_key;
+	const bool is_reloc_root = (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID);
 	u64 reloc_src_root = 0;
 
 	WARN_ON(test_bit(BTRFS_ROOT_SHAREABLE, &root->state) &&
@@ -262,7 +263,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 	else
 		btrfs_node_key(buf, &disk_key, 0);
 
-	if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+	if (is_reloc_root)
 		reloc_src_root = btrfs_header_owner(buf);
 	cow = btrfs_alloc_tree_block(trans, root, 0, new_root_objectid,
 				     &disk_key, level, buf->start, 0,
@@ -276,7 +277,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 	btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
 	btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN |
 				     BTRFS_HEADER_FLAG_RELOC);
-	if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+	if (is_reloc_root)
 		btrfs_set_header_flag(cow, BTRFS_HEADER_FLAG_RELOC);
 	else
 		btrfs_set_header_owner(cow, new_root_objectid);
@@ -291,16 +292,9 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 		return ret;
 	}
 
-	if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
-		ret = btrfs_inc_ref(trans, root, cow, true);
-		if (unlikely(ret))
-			btrfs_abort_transaction(trans, ret);
-	} else {
-		ret = btrfs_inc_ref(trans, root, cow, false);
-		if (unlikely(ret))
-			btrfs_abort_transaction(trans, ret);
-	}
-	if (ret) {
+	ret = btrfs_inc_ref(trans, root, cow, is_reloc_root);
+	if (unlikely(ret)) {
+		btrfs_abort_transaction(trans, ret);
 		btrfs_tree_unlock(cow);
 		free_extent_buffer(cow);
 		return ret;
@@ -362,6 +356,7 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
 	u64 owner;
 	u64 flags;
 	int ret;
+	const bool is_reloc_root = (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID);
 
 	/*
 	 * Backrefs update rules:
@@ -397,8 +392,7 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
 		}
 	} else {
 		refs = 1;
-		if (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID ||
-		    btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
+		if (is_reloc_root || btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
 			flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
 		else
 			flags = 0;
@@ -417,14 +411,13 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
 	}
 
 	if (refs > 1) {
-		if ((owner == btrfs_root_id(root) ||
-		     btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID) &&
+		if ((owner == btrfs_root_id(root) || is_reloc_root) &&
 		    !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
 			ret = btrfs_inc_ref(trans, root, buf, true);
 			if (ret)
 				return ret;
 
-			if (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID) {
+			if (is_reloc_root) {
 				ret = btrfs_dec_ref(trans, root, buf, false);
 				if (ret)
 					return ret;
@@ -437,20 +430,13 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
 			if (ret)
 				return ret;
 		} else {
-
-			if (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID)
-				ret = btrfs_inc_ref(trans, root, cow, true);
-			else
-				ret = btrfs_inc_ref(trans, root, cow, false);
+			ret = btrfs_inc_ref(trans, root, cow, is_reloc_root);
 			if (ret)
 				return ret;
 		}
 	} else {
 		if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
-			if (btrfs_root_id(root) == BTRFS_TREE_RELOC_OBJECTID)
-				ret = btrfs_inc_ref(trans, root, cow, true);
-			else
-				ret = btrfs_inc_ref(trans, root, cow, false);
+			ret = btrfs_inc_ref(trans, root, cow, is_reloc_root);
 			if (ret)
 				return ret;
 			ret = btrfs_dec_ref(trans, root, buf, true);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 527310f3aeb3..f3d33d7a2376 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5875,18 +5875,11 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
 
 	if (wc->refs[level] == 1) {
 		if (level == 0) {
-			if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
-				ret = btrfs_dec_ref(trans, root, eb, true);
-				if (ret) {
-					btrfs_abort_transaction(trans, ret);
-					return ret;
-				}
-			} else {
-				ret = btrfs_dec_ref(trans, root, eb, false);
-				if (unlikely(ret)) {
-					btrfs_abort_transaction(trans, ret);
-					return ret;
-				}
+			const bool full_backref = (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF);
+			ret = btrfs_dec_ref(trans, root, eb, full_backref);
+			if (unlikely(ret)) {
+				btrfs_abort_transaction(trans, ret);
+				return ret;
 			}
 			if (btrfs_is_fstree(btrfs_root_id(root))) {
 				ret = btrfs_qgroup_trace_leaf_items(trans, eb);
-- 
2.51.2