btrfs-progs: libbtrfs: make own copy of lookup_path_rootid

Remove dependency on utils.h and copy the simple lookup_path_rootid
helper.

Signed-off-by: David Sterba <dsterba@suse.com>

libbtrfs/send-stream.c

@@ -20,7 +20,6 @@
 #include "kernel-shared/send.h"
 #include "libbtrfs/send-stream.h"
 #include "crypto/crc32c.h"
-#include "common/utils.h"
 
 struct btrfs_send_stream {
 	char read_buf[BTRFS_SEND_BUF_SIZE];

libbtrfs/send-stream.h

@@ -34,6 +34,8 @@ extern "C" {
 #include <btrfs/kerncompat.h>
 #endif /* BTRFS_FLAT_INCLUDES */
 
+#include <time.h>
+
 struct btrfs_send_ops {
 	int (*subvol)(const char *path, const u8 *uuid, u64 ctransid,
 		      void *user);

libbtrfs/send-utils.c

@@ -24,12 +24,35 @@
 
 #include "kernel-shared/ctree.h"
 #include "libbtrfs/send-utils.h"
-#include "common/utils.h"
 #include "ioctl.h"
 #include "btrfs-list.h"
 
 static int btrfs_subvolid_resolve_sub(int fd, char *path, size_t *path_len,
 				      u64 subvol_id);
+/*
+ * For a given:
+ * - file or directory return the containing tree root id
+ * - subvolume return its own tree id
+ * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
+ *   undefined and function returns -1
+ */
+static int lookup_path_rootid(int fd, u64 *rootid)
+{
+	struct btrfs_ioctl_ino_lookup_args args;
+	int ret;
+
+	memset(&args, 0, sizeof(args));
+	args.treeid = 0;
+	args.objectid = BTRFS_FIRST_FREE_OBJECTID;
+
+	ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
+	if (ret < 0)
+		return -errno;
+
+	*rootid = args.treeid;
+
+	return 0;
+}
 
 static int btrfs_get_root_id_by_sub_path(int mnt_fd, const char *sub_path,
 					 u64 *root_id)