libzfs_sendrecv: Factor out lzc_flags_from_resume_nvl

Improve the readability of zfs_send_resume_impl by moving resume nvl
decoding into a separate helper function.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org>
Closes openzfs#12967

lib/libzfs/libzfs_sendrecv.c

@@ -1456,6 +1456,7 @@ static enum lzc_send_flags
 lzc_flags_from_sendflags(const sendflags_t *flags)
 {
 	enum lzc_send_flags lzc_flags = 0;
+
 	if (flags->largeblock)
 		lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
 	if (flags->embed_data)
@@ -1466,6 +1467,7 @@ lzc_flags_from_sendflags(const sendflags_t *flags)
 		lzc_flags |= LZC_SEND_FLAG_RAW;
 	if (flags->saved)
 		lzc_flags |= LZC_SEND_FLAG_SAVED;
+
 	return (lzc_flags);
 }
 
@@ -1657,6 +1659,25 @@ find_redact_book(libzfs_handle_t *hdl, const char *path,
 	return (0);
 }
 
+static enum lzc_send_flags
+lzc_flags_from_resume_nvl(nvlist_t *resume_nvl)
+{
+	enum lzc_send_flags lzc_flags = 0;
+
+	if (nvlist_exists(resume_nvl, "largeblockok"))
+		lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
+	if (nvlist_exists(resume_nvl, "embedok"))
+		lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;
+	if (nvlist_exists(resume_nvl, "compressok"))
+		lzc_flags |= LZC_SEND_FLAG_COMPRESS;
+	if (nvlist_exists(resume_nvl, "rawok"))
+		lzc_flags |= LZC_SEND_FLAG_RAW;
+	if (nvlist_exists(resume_nvl, "savedok"))
+		lzc_flags |= LZC_SEND_FLAG_SAVED;
+
+	return (lzc_flags);
+}
+
 static int
 zfs_send_resume_impl(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
     nvlist_t *resume_nvl)
@@ -1668,7 +1689,6 @@ zfs_send_resume_impl(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
 	zfs_handle_t *zhp;
 	int error = 0;
 	char name[ZFS_MAX_DATASET_NAME_LEN];
-	enum lzc_send_flags lzc_flags = 0;
 	FILE *fout = (flags->verbosity > 0 && flags->dryrun) ? stdout : stderr;
 	uint64_t *redact_snap_guids = NULL;
 	int num_redact_snaps = 0;
@@ -1695,17 +1715,6 @@ zfs_send_resume_impl(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
 	fromguid = 0;
 	(void) nvlist_lookup_uint64(resume_nvl, "fromguid", &fromguid);
 
-	if (flags->largeblock || nvlist_exists(resume_nvl, "largeblockok"))
-		lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
-	if (flags->embed_data || nvlist_exists(resume_nvl, "embedok"))
-		lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;
-	if (flags->compress || nvlist_exists(resume_nvl, "compressok"))
-		lzc_flags |= LZC_SEND_FLAG_COMPRESS;
-	if (flags->raw || nvlist_exists(resume_nvl, "rawok"))
-		lzc_flags |= LZC_SEND_FLAG_RAW;
-	if (flags->saved || nvlist_exists(resume_nvl, "savedok"))
-		lzc_flags |= LZC_SEND_FLAG_SAVED;
-
 	if (flags->saved) {
 		(void) strcpy(name, toname);
 	} else {
@@ -1766,6 +1775,9 @@ zfs_send_resume_impl(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
 		}
 	}
 
+	enum lzc_send_flags lzc_flags = lzc_flags_from_sendflags(flags) |
+	    lzc_flags_from_resume_nvl(resume_nvl);
+
 	if (flags->verbosity != 0) {
 		/*
 		 * Some of these may have come from the resume token, set them