send_iterate_snap : doall send without fromsnap

The behavior of a NULL fromsnap was inadvertently changed for a doall
send when the send/recv logic in libzfs was updated.  Restore the
previous behavior by correcting send_iterate_snap() to include all
the snapshots in the nvlist for this case. 

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Cedric Maunoury <cedric.maunoury@gmail.com>
Closes #11608

configure.ac

@@ -228,6 +228,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/cmd/readmmap/Makefile
 	tests/zfs-tests/cmd/rename_dir/Makefile
 	tests/zfs-tests/cmd/rm_lnkcnt_zero_file/Makefile
+	tests/zfs-tests/cmd/send_doall/Makefile
 	tests/zfs-tests/cmd/stride_dd/Makefile
 	tests/zfs-tests/cmd/threadsappend/Makefile
 	tests/zfs-tests/cmd/user_ns_exec/Makefile

lib/libzfs/libzfs_sendrecv.c

@@ -321,6 +321,15 @@ send_iterate_snap(zfs_handle_t *zhp, void *arg)
 	}
 
 	if (!sd->recursive) {
+
+		/*
+		 * To allow a doall stream to work properly
+		 * with a NULL fromsnap
+		 */
+		if (sd->doall && sd->fromsnap == NULL && !sd->seenfrom) {
+			sd->seenfrom = B_TRUE;
+		}
+
 		if (!sd->seenfrom && isfromsnap) {
 			sd->seenfrom = B_TRUE;
 			zfs_close(zhp);

tests/runfiles/common.run

@@ -804,7 +804,7 @@ tests = ['recv_dedup', 'recv_dedup_encrypted_zvol', 'rsend_001_pos',
     'send_freeobjects', 'send_realloc_files',
     'send_realloc_encrypted_files', 'send_spill_block', 'send_holds',
     'send_hole_birth', 'send_mixed_raw', 'send-wR_encrypted_zvol',
-    'send_partial_dataset', 'send_invalid']
+    'send_partial_dataset', 'send_invalid', 'send_doall']
 tags = ['functional', 'rsend']
 
 [tests/functional/scrub_mirror]

tests/zfs-tests/cmd/Makefile.am

@@ -24,6 +24,7 @@ SUBDIRS = \
 	readmmap \
 	rename_dir \
 	rm_lnkcnt_zero_file \
+	send_doall \
 	stride_dd \
 	threadsappend
 

tests/zfs-tests/cmd/send_doall/.gitignore

@@ -0,0 +1 @@
+/send_doall

tests/zfs-tests/cmd/send_doall/Makefile.am

@@ -0,0 +1,11 @@
+include $(top_srcdir)/config/Rules.am
+
+pkgexecdir = $(datadir)/@PACKAGE@/zfs-tests/bin
+
+pkgexec_PROGRAMS = send_doall
+
+send_doall_SOURCES = send_doall.c
+send_doall_LDADD = \
+	$(abs_top_builddir)/lib/libzfs_core/libzfs_core.la \
+	$(abs_top_builddir)/lib/libzfs/libzfs.la \
+	$(abs_top_builddir)/lib/libnvpair/libnvpair.la

tests/zfs-tests/cmd/send_doall/send_doall.c

@@ -0,0 +1,87 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Portions Copyright 2020 iXsystems, Inc.
+ */
+
+/*
+ * Test a corner case : a "doall" send without children datasets.
+ */
+
+#include <libzfs.h>
+#include <libzfs_core.h>
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sysexits.h>
+#include <err.h>
+
+static void
+usage(const char *name)
+{
+	fprintf(stderr, "usage: %s snap\n", name);
+	exit(EX_USAGE);
+}
+
+int
+main(int argc, char const * const argv[])
+{
+	sendflags_t flags = { 0 };
+	libzfs_handle_t *zhdl;
+	zfs_handle_t *zhp;
+	const char *tofull, *fsname, *tosnap, *p;
+	int error;
+
+	if (argc != 2)
+		usage(argv[0]);
+
+	tofull = argv[1];
+
+	p = strchr(tofull, '@');
+	if (p == NULL)
+		usage(argv[0]);
+	tosnap = p + 1;
+
+	fsname = strndup(tofull, p - tofull);
+
+	zhdl = libzfs_init();
+	if (zhdl == NULL)
+		errx(EX_OSERR, "libzfs_init(): %s", libzfs_error_init(errno));
+
+	zhp = zfs_open(zhdl, fsname, ZFS_TYPE_FILESYSTEM);
+	if (zhp == NULL)
+		err(EX_OSERR, "zfs_open(\"%s\")", fsname);
+
+	flags.doall = B_TRUE;
+
+	error = zfs_send(zhp, NULL, tosnap, &flags,
+	    STDOUT_FILENO, NULL, NULL, NULL);
+
+	zfs_close(zhp);
+
+	libzfs_fini(zhdl);
+	free((void *)fsname);
+
+	return (error);
+}

tests/zfs-tests/include/commands.cfg

@@ -215,6 +215,7 @@ export ZFSTEST_FILES='badsend
     readmmap
     rename_dir
     rm_lnkcnt_zero_file
+    send_doall
     threadsappend
     user_ns_exec
     xattrtest

tests/zfs-tests/tests/functional/rsend/Makefile.am

@@ -53,7 +53,8 @@ dist_pkgdata_SCRIPTS = \
 	send_hole_birth.ksh \
 	send_invalid.ksh \
 	send_mixed_raw.ksh \
-	send-wR_encrypted_zvol.ksh
+	send-wR_encrypted_zvol.ksh \
+	send_doall.ksh
 
 dist_pkgdata_DATA = \
 	dedup.zsend.bz2 \
@@ -62,3 +63,4 @@ dist_pkgdata_DATA = \
 	fs.tar.gz \
 	rsend.cfg \
 	rsend.kshlib
+

tests/zfs-tests/tests/functional/rsend/send_doall.ksh

@@ -0,0 +1,67 @@
+#!/bin/ksh
+
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright (c) 2019 by Lawrence Livermore National Security, LLC.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/rsend/rsend.kshlib
+
+#
+# Description:
+# Verify send_doall stream is properly received
+#
+# Strategy:
+# 1) Create a set of snapshots.
+# 2) Send these snapshots (from origin to the last one) to a file using send_doall.
+# 3) Receive the file to newfs to test if the stream is properly handled.
+#
+
+verify_runnable "both"
+
+log_assert "Verify send_doall stream is correct"
+
+function cleanup
+{
+	rm -f $BACKDIR/fs@*
+	destroy_dataset $POOL/fs "-rR"
+	destroy_dataset $POOL/newfs "-rR"
+}
+
+log_onexit cleanup
+
+log_must zfs create $POOL/fs
+log_must zfs create $POOL/fs/child
+
+# Create 3 files and a snapshot between each file creation.
+for i in {1..3}; do
+	file="/$POOL/fs/file$i"
+	log_must mkfile 16384 $file
+
+	file="/$POOL/fs/child/file$i"
+	log_must mkfile 16384 $file
+
+	log_must zfs snapshot -r $POOL/fs@snap$i
+done
+
+# Snapshot the pool and send it to the new dataset.
+log_must eval "send_doall $POOL/fs@snap3 >$BACKDIR/fs@snap3"
+log_must eval "zfs recv $POOL/newfs < $BACKDIR/fs@snap3"
+
+zfs list $POOL/newfs/child
+if [[ $? -eq 0 ]]; then
+	log_fail "Children dataset should not have been received"
+fi
+
+log_pass "Verify send_doall stream is correct"