1 files changed, 18 insertions, 0 deletions

diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index f8f20d72b852..f90d10478235 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -785,6 +785,22 @@ struct btrfs_ioctl_get_subvol_info_args {
         __u64 reserved[8];
 };
 
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+struct btrfs_ioctl_get_subvol_rootref_args {
+                /* in/out, minimum id of rootref's treeid to be searched */
+                __u64 min_treeid;
+
+                /* out */
+                struct {
+                        __u64 treeid;
+                        __u64 dirid;
+                } rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+
+                /* out, number of found items */
+                __u8 num_items;
+                __u8 align[7];
+};
+
 /* Error codes as returned by the kernel */
 enum btrfs_err_code {
         BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET = 1,
@@ -905,5 +921,7 @@ enum btrfs_err_code {
                                         struct btrfs_ioctl_logical_ino_args)
 #define BTRFS_IOC_GET_SUBVOL_INFO _IOR(BTRFS_IOCTL_MAGIC, 60, \
                                 struct btrfs_ioctl_get_subvol_info_args)
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF _IOWR(BTRFS_IOCTL_MAGIC, 61, \
+                                struct btrfs_ioctl_get_subvol_rootref_args)
 
 #endif /* _UAPI_LINUX_BTRFS_H */