Deprecate deduplicated send streams

Dedup send can only deduplicate over the set of blocks in the send
command being invoked, and it does not take advantage of the dedup table
to do so. This is a very common misconception among not only users, but
developers, and makes the feature seem more useful than it is. As a
result, many users are using the feature but not getting any benefit
from it.

Dedup send requires a nontrivial expenditure of memory and CPU to
operate, especially if the dataset(s) being sent is (are) not already
using a dedup-strength checksum.

Dedup send adds developer burden. It expands the test matrix when
developing new features, causing bugs in released code, and delaying
development efforts by forcing more testing to be done.

As a result, we are deprecating the use of `zfs send -D` and receiving
of such streams.  This change adds a warning to the man page, and also
prints the warning whenever dedup send or receive are used.

In a future release, we plan to:
1. remove the kernel code for generating deduplicated streams
2. make `zfs send -D` generate regular, non-deduplicated streams
3. remove the kernel code for receiving deduplicated streams
4. make `zfs receive` of deduplicated streams process them in userland
   to "re-duplicate" them, so that they can still be received.

Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes openzfs#7887
Closes openzfs#10117

cmd/zfs/zfs_main.c

@@ -4144,6 +4144,16 @@ zfs_do_send(int argc, char **argv)
 		}
 	}
 
+	if (flags.dedup) {
+		(void) fprintf(stderr,
+		    gettext("WARNING: deduplicated send is "
+		    "deprecated, and will be removed in a\n"
+		    "future release. (In the future, the flag will be "
+		    "accepted, but a\n"
+		    "regular, non-deduplicated stream will be "
+		    "generated.)\n\n"));
+	}
+
 	argc -= optind;
 	argv += optind;
 

include/libzfs_impl.h

@@ -71,6 +71,7 @@ struct libzfs_handle {
 	int libzfs_pool_iter;
 	char libzfs_chassis_id[256];
 	boolean_t libzfs_prop_debug;
+	boolean_t libzfs_dedup_warning_printed;
 };
 
 #define	ZFSSHARE_MISS	0x01	/* Didn't find entry in cache */

lib/libzfs/libzfs_sendrecv.c

@@ -3984,6 +3984,26 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
 			(void) printf("found clone origin %s\n", origin);
 	}
 
+	if (!hdl->libzfs_dedup_warning_printed &&
+	    (DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
+	    DMU_BACKUP_FEATURE_DEDUP)) {
+		(void) fprintf(stderr,
+		    gettext("WARNING: This is a deduplicated send stream.  "
+		    "The ability to send and\n"
+		    "receive deduplicated send streams is deprecated.  "
+		    "In the future, the\n"
+		    "ability to receive a deduplicated send stream with "
+		    "\"zfs receive\" will be\n"
+		    "removed. However, in the future, a utility will be "
+		    "provided to convert a\n"
+		    "deduplicated send stream to a regular "
+		    "(non-deduplicated) stream. This\n"
+		    "future utility will require that the send stream be "
+		    "located in a\n"
+		    "seek-able file, rather than provided by a pipe.\n\n"));
+		hdl->libzfs_dedup_warning_printed = B_TRUE;
+	}
+
 	boolean_t resuming = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
 	    DMU_BACKUP_FEATURE_RESUMING;
 	boolean_t raw = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &

man/man8/zfs.8

@@ -3461,6 +3461,9 @@ By default, a full stream is generated.
 .Bl -tag -width "-D"
 .It Fl D, -dedup
 Generate a deduplicated stream.
+\fBDeduplicated send is deprecated and will be removed in a future release.\fR
+(In the future, the flag will be accepted but a regular, non-deduplicated
+stream will be generated.)
 Blocks which would have been sent multiple times in the send stream will only be
 sent once.
 The receiving system must also support this feature to receive a deduplicated
@@ -3835,6 +3838,18 @@ destroyed by using the
 .Nm zfs Cm destroy Fl d
 command.
 .Pp
+Deduplicated send streams can be generated by using the
+.Nm zfs Cm send Fl D
+command.
+\fBThe ability to send and receive deduplicated send streams is deprecated.\fR
+In the future, the ability to receive a deduplicated send stream with
+.Nm zfs Cm receive
+will be removed.
+However, in the future, a utility will be provided to convert a
+deduplicated send stream to a regular (non-deduplicated) stream.
+This future utility will require that the send stream be located in a
+seek-able file, rather than provided by a pipe.
+.Pp
 If
 .Fl o Em property Ns = Ns Ar value
 or