Separate warning for incomplete and corrupt streams

This change adds a separate return code to zfs_ioc_recv that is used 
for incomplete streams, in addition to the existing return code for 
streams that contain corruption.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #10122

contrib/pyzfs/libzfs_core/_constants.py

@@ -94,6 +94,7 @@ def enum(*sequential, **named):
         'ZFS_ERR_UNKNOWN_SEND_STREAM_FEATURE',
         'ZFS_ERR_EXPORT_IN_PROGRESS',
         'ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR',
+        'ZFS_ERR_STREAM_TRUNCATED',
     ],
     {}
 )

contrib/pyzfs/libzfs_core/_error_translation.py

@@ -469,6 +469,8 @@ def _map(ret, name):
         raise lzc_exc.BadStream()
     if ret == ZFS_ERR_WRONG_PARENT:
         raise lzc_exc.WrongParent(_fs_name(snapname))
+    if ret == zfs_errno.ZFS_ERR_STREAM_TRUNCATED:
+        raise lzc_exc.StreamTruncated()
 
     raise lzc_exc.StreamIOError(ret)
 

contrib/pyzfs/libzfs_core/exceptions.py

@@ -29,7 +29,8 @@
     ZFS_ERR_NO_CHECKPOINT,
     ZFS_ERR_DEVRM_IN_PROGRESS,
     ZFS_ERR_VDEV_TOO_BIG,
-    ZFS_ERR_WRONG_PARENT
+    ZFS_ERR_WRONG_PARENT,
+    zfs_errno
 )
 
 
@@ -351,6 +352,11 @@ class StreamFeatureIncompatible(ZFSError):
     message = "Incompatible embedded feature with encrypted receive"
 
 
+class StreamTruncated(ZFSError):
+    errno = zfs_errno.ZFS_ERR_STREAM_TRUNCATED
+    message = "incomplete stream"
+    
+
 class ReceivePropertyFailure(MultipleOperationsFailure):
     message = "Receiving of properties failed for one or more reasons"
 

contrib/pyzfs/libzfs_core/test/test_libzfs_core.py

@@ -2714,7 +2714,7 @@ def test_send_resume_token_full(self):
             lzc.lzc_send(src, None, stream.fileno())
             stream.seek(0)
             stream.truncate(1024 * 3)
-            with self.assertRaises(lzc_exc.BadStream):
+            with self.assertRaises(lzc_exc.StreamTruncated):
                 lzc.lzc_receive_resumable(dst, stream.fileno())
             # Resume token code from zfs_send_resume_token_to_nvlist()
             # XXX: if used more than twice move this code into an external func
@@ -2771,7 +2771,7 @@ def test_send_resume_token_incremental(self):
             lzc.lzc_send(snap2, snap1, stream.fileno())
             stream.seek(0)
             stream.truncate(1024 * 3)
-            with self.assertRaises(lzc_exc.BadStream):
+            with self.assertRaises(lzc_exc.StreamTruncated):
                 lzc.lzc_receive_resumable(dst2, stream.fileno())
             # Resume token code from zfs_send_resume_token_to_nvlist()
             # format: <version>-<cksum>-<packed-size>-<compressed-payload>

include/sys/fs/zfs.h

@@ -1330,6 +1330,7 @@ typedef enum {
 	ZFS_ERR_UNKNOWN_SEND_STREAM_FEATURE,
 	ZFS_ERR_EXPORT_IN_PROGRESS,
 	ZFS_ERR_BOOKMARK_SOURCE_NOT_ANCESTOR,
+	ZFS_ERR_STREAM_TRUNCATED,
 } zfs_errno_t;
 
 /*

lib/libzfs/libzfs_sendrecv.c

@@ -4253,12 +4253,12 @@ recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
 
 static void
 recv_ecksum_set_aux(libzfs_handle_t *hdl, const char *target_snap,
-    boolean_t resumable)
+    boolean_t resumable, boolean_t checksum)
 {
 	char target_fs[ZFS_MAX_DATASET_NAME_LEN];
 
-	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, (checksum ?
-	    "checksum mismatch or incomplete stream"));
+	    "checksum mismatch" : "incomplete stream")));
 
 	if (!resumable)
 		return;
@@ -5206,7 +5206,9 @@ zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
 			(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
 			break;
 		case ECKSUM:
-			recv_ecksum_set_aux(hdl, destsnap, flags->resumable);
+		case ZFS_ERR_STREAM_TRUNCATED:
+			recv_ecksum_set_aux(hdl, destsnap, flags->resumable,
+			    ioctl_err == ECKSUM);
 			(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
 			break;
 		case ENOTSUP:

module/zfs/dmu_recv.c

@@ -1265,10 +1265,11 @@ receive_read(dmu_recv_cookie_t *drc, int len, void *buf)
 		    len - done, &resid);
 		if (resid == len - done) {
 			/*
-			 * Note: ECKSUM indicates that the receive
+			 * Note: ECKSUM or ZFS_ERR_STREAM_TRUNCATED indicates
-			 * was interrupted and can potentially be resumed.
+			 * that the receive was interrupted and can
+			 * potentially be resumed.
 			 */
-			drc->drc_err = SET_ERROR(ECKSUM);
+			drc->drc_err = SET_ERROR(ZFS_ERR_STREAM_TRUNCATED);
 		}
 		drc->drc_voff += len - done - resid;
 		done = len - resid;

tests/zfs-tests/cmd/libzfs_input_check/libzfs_input_check.c

@@ -556,7 +556,7 @@ test_recv_new(const char *dataset, int fd)
 	fnvlist_add_boolean(optional, "resumable");
 	fnvlist_add_uint64(optional, "action_handle", *action_handle);
 #endif
-	IOC_INPUT_TEST(ZFS_IOC_RECV_NEW, dataset, required, optional, ECKSUM);
+	IOC_INPUT_TEST(ZFS_IOC_RECV_NEW, dataset, required, optional, ZFS_ERR_STREAM_TRUNCATED);
 
 	nvlist_free(props);
 	nvlist_free(optional);