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 <[email protected]>

Author: behlendorf

include/libzfs_core.h

@@ -69,6 +69,9 @@ int lzc_receive_resumable(const char *, nvlist_t *, const char *,
     boolean_t, int);
 int lzc_receive_with_header(const char *, nvlist_t *, const char *, boolean_t,
     boolean_t, int, const struct dmu_replay_record *);
+int lzc_receive_one(const char *, nvlist_t *, const char *, boolean_t,
+    boolean_t, int, const struct dmu_replay_record *, int, uint64_t *,
+    uint64_t *, uint64_t *, nvlist_t **);
 
 boolean_t lzc_exists(const char *);
 

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.

include/sys/zfs_ioctl.h

@@ -389,15 +389,14 @@ typedef struct zfs_cmd {
 	uint64_t	zc_iflags;		/* internal to zfs(7fs) */
 	zfs_share_t	zc_share;
 	dmu_objset_stats_t zc_objset_stats;
-	dmu_replay_record_t zc_begin_record;
+	struct drr_begin zc_begin_record;
 	zinject_record_t zc_inject_record;
 	uint32_t	zc_defer_destroy;
 	uint32_t	zc_flags;
 	uint64_t	zc_action_handle;
 	int		zc_cleanup_fd;
 	uint8_t		zc_simple;
-	boolean_t	zc_resumable;
-	uint8_t		zc_pad[2];		/* alignment */
+	uint8_t		zc_pad[3];		/* alignment */
 	uint64_t	zc_sendobj;
 	uint64_t	zc_fromobj;
 	uint64_t	zc_createtxg;