tests: {read,write}_dos_attributes: despaghettify

Also: actually accept all the flags in write_d_a

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13259

tests/zfs-tests/cmd/linux_dos_attributes/.gitignore

@@ -0,0 +1,2 @@
+/read_dos_attributes
+/write_dos_attributes

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

@@ -0,0 +1,8 @@
+include $(top_srcdir)/config/Rules.am
+
+pkgexecdir = $(datadir)/@PACKAGE@/zfs-tests/bin
+
+EXTRA_DIST = dos_attributes.h
+pkgexec_PROGRAMS = read_dos_attributes write_dos_attributes
+read_dos_attributes_SOURCES = read_dos_attributes.c
+write_dos_attributes_SOURCES = write_dos_attributes.c

tests/zfs-tests/cmd/linux_dos_attributes/dos_attributes.h

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: 0BSD
+
+#include <inttypes.h>
+
+
+#define	U_APPEND_SHORT		"uappnd"
+#define	U_APPEND_FULL		"uappend"
+#define	SU_APPEND_SHORT		"sappnd"
+#define	SU_APPEND_FULL		"sappend"
+
+#define	U_ARCH_SHORT		"uarch"
+#define	U_ARCH_FULL		"uarchive"
+#define	SU_ARCH_SHORT		"arch"
+#define	SU_ARCH_FULL		"archived"
+
+#define	U_HIDDEN_SHORT		"hidden"
+#define	U_HIDDEN_FULL		"uhidden"
+
+#define	SU_IMMUTABLE_FULL	"simmutable"
+#define	SU_IMMUTABLE_SHORT	"schange"
+#define	SU_IMMUTABLE		"schg"
+#define	U_IMMUTABLE_FULL	"uimmutable"
+#define	U_IMMUTABLE_SHORT	"uchange"
+#define	U_IMMUTABLE		"uchg"
+
+#define	SU_NODUMP		"nodump"
+#define	UNSET_NODUMP		"dump"
+
+#define	U_UNLINK_SHORT		"uunlnk"
+#define	U_UNLINK_FULL		"uunlink"
+#define	SU_UNLINK_SHORT		"sunlnk"
+#define	SU_UNLINK_FULL		"sunlink"
+
+#define	U_OFFLINE_SHORT		"offline"
+#define	U_OFFLINE_FULL		"uoffline"
+
+#define	U_RDONLY		"rdonly"
+#define	U_RDONLY_SHORT		"urdonly"
+#define	U_RDONLY_FULL		"readonly"
+
+#define	U_REPARSE_SHORT		"reparse"
+#define	U_REPARSE_FULL		"ureparse"
+
+#define	U_SPARSE_SHORT		"sparse"
+#define	U_SPARSE_FULL		"usparse"
+
+#define	U_SYSTEM_SHORT		"system"
+#define	U_SYSTEM_FULL		"usystem"
+
+
+static const uint64_t all_dos_attributes[] = {
+	ZFS_ARCHIVE,
+	ZFS_APPENDONLY,
+	ZFS_IMMUTABLE,
+	ZFS_NOUNLINK,
+	ZFS_NODUMP,
+	ZFS_HIDDEN,
+	ZFS_OFFLINE,
+	ZFS_READONLY,
+	ZFS_SPARSE,
+	ZFS_SYSTEM,
+	ZFS_REPARSE,
+};
+
+static const char *const all_dos_attribute_names[][7] = {
+	{U_ARCH_SHORT, U_ARCH_FULL, SU_ARCH_SHORT, SU_ARCH_FULL},
+	{U_APPEND_SHORT, U_APPEND_FULL, SU_APPEND_SHORT, SU_APPEND_FULL},
+	{SU_IMMUTABLE_FULL, SU_IMMUTABLE_SHORT, SU_IMMUTABLE,
+	    U_IMMUTABLE_FULL, U_IMMUTABLE_SHORT, U_IMMUTABLE},
+	{U_UNLINK_SHORT, U_UNLINK_FULL, SU_UNLINK_FULL, SU_UNLINK_SHORT},
+	{SU_NODUMP, /* UNSET_NODUMP */},
+	{U_HIDDEN_SHORT, U_HIDDEN_FULL},
+	{U_OFFLINE_SHORT, U_OFFLINE_FULL},
+	{U_RDONLY, U_RDONLY_SHORT, U_RDONLY_FULL},
+	{U_SPARSE_SHORT, U_SPARSE_FULL},
+	{U_SYSTEM_SHORT, U_SYSTEM_FULL},
+	{U_REPARSE_SHORT, U_REPARSE_FULL},
+};
+
+_Static_assert(
+    ARRAY_SIZE(all_dos_attributes) == ARRAY_SIZE(all_dos_attribute_names),
+	"attribute list length mismatch");

tests/zfs-tests/cmd/linux_dos_attributes/read_dos_attributes.c

@@ -0,0 +1,60 @@
+/*
+ * 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 2022 iXsystems, Inc.
+ */
+
+/*
+ * FreeBSD exposes additional file attributes via ls -o and chflags.
+ * Under Linux, we provide ZFS_IOC_[GS]ETDOSFLAGS ioctl()s.
+ *
+ * This application is the equivalent to FreeBSD ls -lo $1 | awk '{print $5}'.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/fs/zfs.h>
+#include "dos_attributes.h"
+
+int
+main(int argc, const char *const *argv)
+{
+	if (argc != 2)
+		errx(EXIT_FAILURE, "usage: %s file", argv[0]);
+
+	int fd = open(argv[1], O_RDONLY | O_CLOEXEC);
+	if (fd == -1)
+		err(EXIT_FAILURE, "%s", argv[1]);
+
+	uint64_t flags;
+	if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &flags) == -1)
+		err(EXIT_FAILURE, "ZFS_IOC_GETDOSFLAGS");
+
+	bool any = false;
+	for (size_t i = 0; i < ARRAY_SIZE(all_dos_attributes); ++i)
+		if (flags & all_dos_attributes[i]) {
+			if (any)
+				putchar(',');
+			(void) fputs(*all_dos_attribute_names[i], stdout);
+			any = true;
+		}
+	if (any)
+		(void) putchar('\n');
+	else
+		(void) puts("-");
+}

tests/zfs-tests/cmd/linux_dos_attributes/write_dos_attributes.c

@@ -0,0 +1,95 @@
+/*
+ * 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 2022 iXsystems, Inc.
+ */
+
+/*
+ * FreeBSD exposes additional file attributes via ls -o and chflags.
+ * Under Linux, we provide ZFS_IOC_[GS]ETDOSFLAGS ioctl()s.
+ *
+ * This application is equivalent to FreeBSD chflags.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/fs/zfs.h>
+#include "dos_attributes.h"
+
+int
+main(int argc, const char *const *argv)
+{
+	if (argc != 3)
+		errx(EXIT_FAILURE, "usage: %s flag file", argv[0]);
+
+	bool unset = false;
+	uint64_t attr = 0;
+	const char *flag = argv[1];
+	if (strcmp(flag, "0") == 0)
+		;
+	else if (strcmp(flag, SU_NODUMP) == 0)
+		attr = ZFS_NODUMP;
+	else if (strcmp(flag, UNSET_NODUMP) == 0) {
+		attr = ZFS_NODUMP;
+		unset = true;
+	} else {
+		if (strncmp(flag, "no", 2) == 0) {
+			unset = true;
+			flag += 2;
+		}
+		for (size_t i = 0; i < ARRAY_SIZE(all_dos_attribute_names); ++i)
+			for (const char *const *nm = all_dos_attribute_names[i];
+			    *nm; ++nm)
+				if (strcmp(flag, *nm) == 0) {
+					attr = all_dos_attributes[i];
+					goto found;
+				}
+
+		errx(EXIT_FAILURE, "%s: unknown flag", argv[1]);
+found:;
+	}
+
+	int fd = open(argv[2], O_RDWR | O_APPEND | O_CLOEXEC);
+	if (fd == -1)
+		err(EXIT_FAILURE, "%s", argv[2]);
+
+	uint64_t flags;
+	if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &flags) == -1)
+		err(EXIT_FAILURE, "ZFS_IOC_GETDOSFLAGS");
+
+	if (attr == 0)
+		flags = 0;
+	else if (unset)
+		flags &= ~attr;
+	else
+		flags |= attr;
+
+	if (ioctl(fd, ZFS_IOC_SETDOSFLAGS, &flags) == -1)
+		err(EXIT_FAILURE, "ZFS_IOC_SETDOSFLAGS");
+
+	uint64_t newflags;
+	if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &newflags) == -1)
+		err(EXIT_FAILURE, "second ZFS_IOC_GETDOSFLAGS");
+
+	if (newflags != flags)
+		errx(EXIT_FAILURE, "expecting %#" PRIx64 ", got %#" PRIx64
+		    "; %ssetting %#" PRIx64 "",
+		    flags, newflags, unset ? "un" : "", attr);
+
+	(void) printf("%#" PRIx64 "\n", flags);
+}