[PATCH] btrfs: simplify btrfs_lookup_inode_extref() by removing unused parameters

[Sun YangKai <sunk67188@gmail.com>]

The `btrfs_lookup_inode_extref()` function no longer requires transaction
handle, insert length, or COW flag, as the onlycaller now perform a
read-only lookup using `trans = NULL`, `ins_len = 0`, and `cow = 0`.

This patch removes the unused parameters from the function signature and
call sites, simplifying the interface and clarifying its current usage as
a read-only lookup helper.

No functional changes intended.

Signed-off-by: Sun YangKai <sunk67188@gmail.com>
---
 fs/btrfs/inode-item.c | 8 +++-----
 fs/btrfs/inode-item.h | 4 +---
 fs/btrfs/tree-log.c   | 5 ++---
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index a61c3540d67b..a35abe10de64 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -79,12 +79,10 @@ struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
 
 /* Returns NULL if no extref found */
 struct btrfs_inode_extref *
-btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
-			  struct btrfs_root *root,
+btrfs_lookup_inode_extref(struct btrfs_root *root,
 			  struct btrfs_path *path,
 			  const struct fscrypt_str *name,
-			  u64 inode_objectid, u64 ref_objectid, int ins_len,
-			  int cow)
+			  u64 inode_objectid, u64 ref_objectid)
 {
 	int ret;
 	struct btrfs_key key;
@@ -93,7 +91,7 @@ btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
 	key.type = BTRFS_INODE_EXTREF_KEY;
 	key.offset = btrfs_extref_hash(ref_objectid, name->name, name->len);
 
-	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 	if (ret < 0)
 		return ERR_PTR(ret);
 	if (ret > 0)
diff --git a/fs/btrfs/inode-item.h b/fs/btrfs/inode-item.h
index c11b97fdccc4..c57661bdde30 100644
--- a/fs/btrfs/inode-item.h
+++ b/fs/btrfs/inode-item.h
@@ -102,12 +102,10 @@ int btrfs_lookup_inode(struct btrfs_trans_handle *trans,
 		       struct btrfs_key *location, int mod);
 
 struct btrfs_inode_extref *btrfs_lookup_inode_extref(
-			  struct btrfs_trans_handle *trans,
 			  struct btrfs_root *root,
 			  struct btrfs_path *path,
 			  const struct fscrypt_str *name,
-			  u64 inode_objectid, u64 ref_objectid, int ins_len,
-			  int cow);
+			  u64 inode_objectid, u64 ref_objectid);
 
 struct btrfs_inode_ref *btrfs_find_name_in_backref(const struct extent_buffer *leaf,
 						   int slot,
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 97e933113b82..66fff2bc60f3 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1125,9 +1125,8 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
 	btrfs_release_path(path);
 
 	/* Same search but for extended refs */
-	extref = btrfs_lookup_inode_extref(NULL, root, path, name,
-					   inode_objectid, parent_objectid, 0,
-					   0);
+	extref = btrfs_lookup_inode_extref(root, path, name,
+					   inode_objectid, parent_objectid);
 	if (IS_ERR(extref)) {
 		return PTR_ERR(extref);
 	} else if (extref) {
-- 
2.49.0