Implement zfs_ioc_recv_new() for OpenZFS 2605

Adds ZFS_IOC_RECV_NEW for resumable streams and preserves the legacy
ZFS_IOC_RECV user/kernel interface.  The new interface supports all
stream options but is currently only used for resumable streams.
This way updated user space utilities will interoperate with older
kernel modules.

ZFS_IOC_RECV_NEW is modeled after the existing ZFS_IOC_SEND_NEW
handler.  Non-Linux OpenZFS platforms have opted to change the
legacy interface in an incompatible fashion instead of adding a
new ioctl.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

include/sys/fs/zfs.h

@@ -232,6 +232,7 @@ typedef enum {
 
 #define	ZPROP_SOURCE_VAL_RECVD	"$recvd"
 #define	ZPROP_N_MORE_ERRORS	"N_MORE_ERRORS"
+
 /*
  * Dataset flag implemented as a special entry in the props zap object
  * indicating that the dataset has received properties on or after
@@ -923,7 +924,7 @@ typedef struct ddt_histogram {
  */
 typedef enum zfs_ioc {
 	/*
-	 * Illumos - 70/128 numbers reserved.
+	 * Illumos - 71/128 numbers reserved.
 	 */
 	ZFS_IOC_FIRST =	('Z' << 8),
 	ZFS_IOC = ZFS_IOC_FIRST,
@@ -997,6 +998,7 @@ typedef enum zfs_ioc {
 	ZFS_IOC_BOOKMARK,
 	ZFS_IOC_GET_BOOKMARKS,
 	ZFS_IOC_DESTROY_BOOKMARKS,
+	ZFS_IOC_RECV_NEW,
 
 	/*
 	 * Linux - 3/64 numbers reserved.