btrfs: use saner variable type and name to indicate extrefs at add_inode_ref()

We are using a variable named 'log_ref_ver' of type int to indicate if we
are processing an extref item or not, using a value of 1 if so, otherwise
0. This is an odd name and type, so rename it to 'is_extref_item' and
change its type to bool.

Reviewed-by: Boris Burkov <[email protected]>
Signed-off-by: Filipe Manana <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: fdmanana

fs/btrfs/tree-log.c

@@ -1385,7 +1385,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 	unsigned long ref_end;
 	struct fscrypt_str name = { 0 };
 	int ret;
-	int log_ref_ver = 0;
+	const bool is_extref_item = (key->type == BTRFS_INODE_EXTREF_KEY);
 	u64 parent_objectid;
 	u64 inode_objectid;
 	u64 ref_index = 0;
@@ -1394,11 +1394,10 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 	ref_ptr = btrfs_item_ptr_offset(eb, slot);
 	ref_end = ref_ptr + btrfs_item_size(eb, slot);
 
-	if (key->type == BTRFS_INODE_EXTREF_KEY) {
+	if (is_extref_item) {
 		struct btrfs_inode_extref *r;
 
 		ref_struct_size = sizeof(struct btrfs_inode_extref);
-		log_ref_ver = 1;
 		r = (struct btrfs_inode_extref *)ref_ptr;
 		parent_objectid = btrfs_inode_extref_parent(eb, r);
 	} else {
@@ -1430,7 +1429,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 	}
 
 	while (ref_ptr < ref_end) {
-		if (log_ref_ver) {
+		if (is_extref_item) {
 			ret = extref_get_fields(eb, ref_ptr, &name,
 						&ref_index, &parent_objectid);
 			if (ret)
@@ -1505,7 +1504,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 		ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + name.len;
 		kfree(name.name);
 		name.name = NULL;
-		if (log_ref_ver && dir) {
+		if (is_extref_item && dir) {
 			iput(&dir->vfs_inode);
 			dir = NULL;
 		}