[mirror_zfs.git] / cmd / zhack / zhack.c

/*
 * 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
 */

/*
 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
 * Copyright (c) 2013 Steven Hartland. All rights reserved.
 */

/*
 * zhack is a debugging tool that can write changes to ZFS pool using libzpool
 * for testing purposes. Altering pools with zhack is unsupported and may
 * result in corrupted pools.
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/dmu.h>
#include <sys/zap.h>
#include <sys/zfs_znode.h>
#include <sys/dsl_synctask.h>
#include <sys/vdev.h>
#include <sys/fs/zfs.h>
#include <sys/dmu_objset.h>
#include <sys/dsl_pool.h>
#include <sys/zio_checksum.h>
#include <sys/zio_compress.h>
#include <sys/zfeature.h>
#include <sys/dmu_tx.h>
#include <libzfs.h>

extern boolean_t zfeature_checks_disable;

const char cmdname[] = "zhack";
libzfs_handle_t *g_zfs;
static importargs_t g_importargs;
static char *g_pool;
static boolean_t g_readonly;

static void
usage(void)
{
	(void) fprintf(stderr,
	    "Usage: %s [-c cachefile] [-d dir] <subcommand> <args> ...\n"
	    "where <subcommand> <args> is one of the following:\n"
	    "\n", cmdname);

	(void) fprintf(stderr,
	    "    feature stat <pool>\n"
	    "        print information about enabled features\n"
	    "    feature enable [-r] [-d desc] <pool> <feature>\n"
	    "        add a new enabled feature to the pool\n"
	    "        -d <desc> sets the feature's description\n"
	    "        -r set read-only compatible flag for feature\n"
	    "    feature ref [-md] <pool> <feature>\n"
	    "        change the refcount on the given feature\n"
	    "        -d decrease instead of increase the refcount\n"
	    "        -m add the feature to the label if increasing refcount\n"
	    "\n"
	    "    <feature> : should be a feature guid\n");
	exit(1);
}


static void
fatal(spa_t *spa, void *tag, const char *fmt, ...)
{
	va_list ap;

	if (spa != NULL) {
		spa_close(spa, tag);
		(void) spa_export(g_pool, NULL, B_TRUE, B_FALSE);
	}

	va_start(ap, fmt);
	(void) fprintf(stderr, "%s: ", cmdname);
	(void) vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void) fprintf(stderr, "\n");

	exit(1);
}

/* ARGSUSED */
static int
space_delta_cb(dmu_object_type_t bonustype, void *data,
    uint64_t *userp, uint64_t *groupp)
{
	/*
	 * Is it a valid type of object to track?
	 */
	if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
		return (ENOENT);
	(void) fprintf(stderr, "modifying object that needs user accounting");
	abort();
	/* NOTREACHED */
}

/*
 * Target is the dataset whose pool we want to open.
 */
static void
zhack_import(char *target, boolean_t readonly)
{
	nvlist_t *config;
	nvlist_t *props;
	int error;

	kernel_init(readonly ? FREAD : (FREAD | FWRITE));
	g_zfs = libzfs_init();
	ASSERT(g_zfs != NULL);

	dmu_objset_register_type(DMU_OST_ZFS, space_delta_cb);

	g_readonly = readonly;
	g_importargs.unique = B_TRUE;
	g_importargs.can_be_active = readonly;
	g_pool = strdup(target);

	error = zpool_tryimport(g_zfs, target, &config, &g_importargs);
	if (error)
		fatal(NULL, FTAG, "cannot import '%s': %s", target,
		    libzfs_error_description(g_zfs));

	props = NULL;
	if (readonly) {
		VERIFY(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0);
		VERIFY(nvlist_add_uint64(props,
		    zpool_prop_to_name(ZPOOL_PROP_READONLY), 1) == 0);
	}

	zfeature_checks_disable = B_TRUE;
	error = spa_import(target, config, props, ZFS_IMPORT_NORMAL);
	zfeature_checks_disable = B_FALSE;
	if (error == EEXIST)
		error = 0;

	if (error)
		fatal(NULL, FTAG, "can't import '%s': %s", target,
		    strerror(error));
}

static void
zhack_spa_open(char *target, boolean_t readonly, void *tag, spa_t **spa)
{
	int err;

	zhack_import(target, readonly);

	zfeature_checks_disable = B_TRUE;
	err = spa_open(target, spa, tag);
	zfeature_checks_disable = B_FALSE;

	if (err != 0)
		fatal(*spa, FTAG, "cannot open '%s': %s", target,
		    strerror(err));
	if (spa_version(*spa) < SPA_VERSION_FEATURES) {
		fatal(*spa, FTAG, "'%s' has version %d, features not enabled",
		    target, (int)spa_version(*spa));
	}
}

static void
dump_obj(objset_t *os, uint64_t obj, const char *name)
{
	zap_cursor_t zc;
	zap_attribute_t za;

	(void) printf("%s_obj:\n", name);

	for (zap_cursor_init(&zc, os, obj);
	    zap_cursor_retrieve(&zc, &za) == 0;
	    zap_cursor_advance(&zc)) {
		if (za.za_integer_length == 8) {
			ASSERT(za.za_num_integers == 1);
			(void) printf("\t%s = %llu\n",
			    za.za_name, (u_longlong_t)za.za_first_integer);
		} else {
			ASSERT(za.za_integer_length == 1);
			char val[1024];
			VERIFY(zap_lookup(os, obj, za.za_name,
			    1, sizeof (val), val) == 0);
			(void) printf("\t%s = %s\n", za.za_name, val);
		}
	}
	zap_cursor_fini(&zc);
}

static void
dump_mos(spa_t *spa)
{
	nvlist_t *nv = spa->spa_label_features;
	nvpair_t *pair;

	(void) printf("label config:\n");
	for (pair = nvlist_next_nvpair(nv, NULL);
	    pair != NULL;
	    pair = nvlist_next_nvpair(nv, pair)) {
		(void) printf("\t%s\n", nvpair_name(pair));
	}
}

static void
zhack_do_feature_stat(int argc, char **argv)
{
	spa_t *spa;
	objset_t *os;
	char *target;

	argc--;
	argv++;

	if (argc < 1) {
		(void) fprintf(stderr, "error: missing pool name\n");
		usage();
	}
	target = argv[0];

	zhack_spa_open(target, B_TRUE, FTAG, &spa);
	os = spa->spa_meta_objset;

	dump_obj(os, spa->spa_feat_for_read_obj, "for_read");
	dump_obj(os, spa->spa_feat_for_write_obj, "for_write");
	dump_obj(os, spa->spa_feat_desc_obj, "descriptions");
	if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) {
		dump_obj(os, spa->spa_feat_enabled_txg_obj, "enabled_txg");
	}
	dump_mos(spa);

	spa_close(spa, FTAG);
}

static void
zhack_feature_enable_sync(void *arg, dmu_tx_t *tx)
{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	zfeature_info_t *feature = arg;

	feature_enable_sync(spa, feature, tx);

	spa_history_log_internal(spa, "zhack enable feature", tx,
	    "name=%s flags=%u",
	    feature->fi_guid, feature->fi_flags);
}

static void
zhack_do_feature_enable(int argc, char **argv)
{
	char c;
	char *desc, *target;
	spa_t *spa;
	objset_t *mos;
	zfeature_info_t feature;
	spa_feature_t nodeps[] = { SPA_FEATURE_NONE };

	/*
	 * Features are not added to the pool's label until their refcounts
	 * are incremented, so fi_mos can just be left as false for now.
	 */
	desc = NULL;
	feature.fi_uname = "zhack";
	feature.fi_flags = 0;
	feature.fi_depends = nodeps;
	feature.fi_feature = SPA_FEATURE_NONE;

	optind = 1;
	while ((c = getopt(argc, argv, "+rd:")) != -1) {
		switch (c) {
		case 'r':
			feature.fi_flags |= ZFEATURE_FLAG_READONLY_COMPAT;
			break;
		case 'd':
			desc = strdup(optarg);
			break;
		default:
			usage();
			break;
		}
	}

	if (desc == NULL)
		desc = strdup("zhack injected");
	feature.fi_desc = desc;

	argc -= optind;
	argv += optind;

	if (argc < 2) {
		(void) fprintf(stderr, "error: missing feature or pool name\n");
		usage();
	}
	target = argv[0];
	feature.fi_guid = argv[1];

	if (!zfeature_is_valid_guid(feature.fi_guid))
		fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid);

	zhack_spa_open(target, B_FALSE, FTAG, &spa);
	mos = spa->spa_meta_objset;

	if (zfeature_is_supported(feature.fi_guid))
		fatal(spa, FTAG, "'%s' is a real feature, will not enable");
	if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid))
		fatal(spa, FTAG, "feature already enabled: %s",
		    feature.fi_guid);

	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
	    zhack_feature_enable_sync, &feature, 5, ZFS_SPACE_CHECK_NORMAL));

	spa_close(spa, FTAG);

	free(desc);
}

static void
feature_incr_sync(void *arg, dmu_tx_t *tx)
{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	zfeature_info_t *feature = arg;
	uint64_t refcount;

	VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
	feature_sync(spa, feature, refcount + 1, tx);
	spa_history_log_internal(spa, "zhack feature incr", tx,
	    "name=%s", feature->fi_guid);
}

static void
feature_decr_sync(void *arg, dmu_tx_t *tx)
{
	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
	zfeature_info_t *feature = arg;
	uint64_t refcount;

	VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
	feature_sync(spa, feature, refcount - 1, tx);
	spa_history_log_internal(spa, "zhack feature decr", tx,
	    "name=%s", feature->fi_guid);
}

static void
zhack_do_feature_ref(int argc, char **argv)
{
	char c;
	char *target;
	boolean_t decr = B_FALSE;
	spa_t *spa;
	objset_t *mos;
	zfeature_info_t feature;
	spa_feature_t nodeps[] = { SPA_FEATURE_NONE };

	/*
	 * fi_desc does not matter here because it was written to disk
	 * when the feature was enabled, but we need to properly set the
	 * feature for read or write based on the information we read off
	 * disk later.
	 */
	feature.fi_uname = "zhack";
	feature.fi_flags = 0;
	feature.fi_desc = NULL;
	feature.fi_depends = nodeps;
	feature.fi_feature = SPA_FEATURE_NONE;

	optind = 1;
	while ((c = getopt(argc, argv, "+md")) != -1) {
		switch (c) {
		case 'm':
			feature.fi_flags |= ZFEATURE_FLAG_MOS;
			break;
		case 'd':
			decr = B_TRUE;
			break;
		default:
			usage();
			break;
		}
	}
	argc -= optind;
	argv += optind;

	if (argc < 2) {
		(void) fprintf(stderr, "error: missing feature or pool name\n");
		usage();
	}
	target = argv[0];
	feature.fi_guid = argv[1];

	if (!zfeature_is_valid_guid(feature.fi_guid))
		fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid);

	zhack_spa_open(target, B_FALSE, FTAG, &spa);
	mos = spa->spa_meta_objset;

	if (zfeature_is_supported(feature.fi_guid)) {
		fatal(spa, FTAG,
		    "'%s' is a real feature, will not change refcount");
	}

	if (0 == zap_contains(mos, spa->spa_feat_for_read_obj,
	    feature.fi_guid)) {
		feature.fi_flags &= ~ZFEATURE_FLAG_READONLY_COMPAT;
	} else if (0 == zap_contains(mos, spa->spa_feat_for_write_obj,
	    feature.fi_guid)) {
		feature.fi_flags |= ZFEATURE_FLAG_READONLY_COMPAT;
	} else {
		fatal(spa, FTAG, "feature is not enabled: %s", feature.fi_guid);
	}

	if (decr) {
		uint64_t count;
		if (feature_get_refcount_from_disk(spa, &feature,
		    &count) == 0 && count == 0) {
			fatal(spa, FTAG, "feature refcount already 0: %s",
			    feature.fi_guid);
		}
	}

	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
	    decr ? feature_decr_sync : feature_incr_sync, &feature,
	    5, ZFS_SPACE_CHECK_NORMAL));

	spa_close(spa, FTAG);
}

static int
zhack_do_feature(int argc, char **argv)
{
	char *subcommand;

	argc--;
	argv++;
	if (argc == 0) {
		(void) fprintf(stderr,
		    "error: no feature operation specified\n");
		usage();
	}

	subcommand = argv[0];
	if (strcmp(subcommand, "stat") == 0) {
		zhack_do_feature_stat(argc, argv);
	} else if (strcmp(subcommand, "enable") == 0) {
		zhack_do_feature_enable(argc, argv);
	} else if (strcmp(subcommand, "ref") == 0) {
		zhack_do_feature_ref(argc, argv);
	} else {
		(void) fprintf(stderr, "error: unknown subcommand: %s\n",
		    subcommand);
		usage();
	}

	return (0);
}

#define	MAX_NUM_PATHS 1024

int
main(int argc, char **argv)
{
	extern void zfs_prop_init(void);

	char *path[MAX_NUM_PATHS];
	const char *subcommand;
	int rv = 0;
	char c;

	g_importargs.path = path;

	dprintf_setup(&argc, argv);
	zfs_prop_init();

	while ((c = getopt(argc, argv, "+c:d:")) != -1) {
		switch (c) {
		case 'c':
			g_importargs.cachefile = optarg;
			break;
		case 'd':
			assert(g_importargs.paths < MAX_NUM_PATHS);
			g_importargs.path[g_importargs.paths++] = optarg;
			break;
		default:
			usage();
			break;
		}
	}

	argc -= optind;
	argv += optind;
	optind = 1;

	if (argc == 0) {
		(void) fprintf(stderr, "error: no command specified\n");
		usage();
	}

	subcommand = argv[0];

	if (strcmp(subcommand, "feature") == 0) {
		rv = zhack_do_feature(argc, argv);
	} else {
		(void) fprintf(stderr, "error: unknown subcommand: %s\n",
		    subcommand);
		usage();
	}

	if (!g_readonly && spa_export(g_pool, NULL, B_TRUE, B_FALSE) != 0) {
		fatal(NULL, FTAG, "pool export failed; "
		    "changes may not be committed to disk\n");
	}

	libzfs_fini(g_zfs);
	kernel_fini();

	return (rv);
}
Commit	Line	Data
9ae529ec CS	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21
	22	/*
241b5415	23	* Copyright (c) 2011, 2015 by Delphix. All rights reserved.
95fd54a1	24	* Copyright (c) 2013 Steven Hartland. All rights reserved.
9ae529ec CS	25	*/
	26
	27	/*
	28	* zhack is a debugging tool that can write changes to ZFS pool using libzpool
	29	* for testing purposes. Altering pools with zhack is unsupported and may
	30	* result in corrupted pools.
	31	*/
	32
	33	#include <stdio.h>
	34	#include <stdlib.h>
	35	#include <ctype.h>
	36	#include <sys/zfs_context.h>
	37	#include <sys/spa.h>
	38	#include <sys/spa_impl.h>
	39	#include <sys/dmu.h>
	40	#include <sys/zap.h>
	41	#include <sys/zfs_znode.h>
	42	#include <sys/dsl_synctask.h>
	43	#include <sys/vdev.h>
	44	#include <sys/fs/zfs.h>
	45	#include <sys/dmu_objset.h>
	46	#include <sys/dsl_pool.h>
	47	#include <sys/zio_checksum.h>
	48	#include <sys/zio_compress.h>
	49	#include <sys/zfeature.h>
13fe0198	50	#include <sys/dmu_tx.h>
9ae529ec CS	51	#include <libzfs.h>
	52
	53	extern boolean_t zfeature_checks_disable;
	54
	55	const char cmdname[] = "zhack";
	56	libzfs_handle_t *g_zfs;
	57	static importargs_t g_importargs;
	58	static char *g_pool;
	59	static boolean_t g_readonly;
	60
	61	static void
	62	usage(void)
	63	{
	64	(void) fprintf(stderr,
ada82581	65	"Usage: %s [-c cachefile] [-d dir] <subcommand> <args> ...\n"
9ae529ec CS	66	"where <subcommand> <args> is one of the following:\n"
	67	"\n", cmdname);
	68
	69	(void) fprintf(stderr,
	70	" feature stat <pool>\n"
	71	" print information about enabled features\n"
9d69e9b2	72	" feature enable [-r] [-d desc] <pool> <feature>\n"
9ae529ec CS	73	" add a new enabled feature to the pool\n"
9ae529ec CS	74	" -d <desc> sets the feature's description\n"
9d69e9b2	75	" -r set read-only compatible flag for feature\n"
9ae529ec CS	76	" feature ref [-md] <pool> <feature>\n"
	77	" change the refcount on the given feature\n"
	78	" -d decrease instead of increase the refcount\n"
	79	" -m add the feature to the label if increasing refcount\n"
	80	"\n"
	81	" <feature> : should be a feature guid\n");
	82	exit(1);
	83	}
	84
	85
	86	static void
2fbc542e	87	fatal(spa_t spa, void tag, const char *fmt, ...)
9ae529ec CS	88	{
	89	va_list ap;
	90
2fbc542e GW	91	if (spa != NULL) {
	92	spa_close(spa, tag);
	93	(void) spa_export(g_pool, NULL, B_TRUE, B_FALSE);
	94	}
	95
9ae529ec CS	96	va_start(ap, fmt);
	97	(void) fprintf(stderr, "%s: ", cmdname);
	98	(void) vfprintf(stderr, fmt, ap);
	99	va_end(ap);
	100	(void) fprintf(stderr, "\n");
	101
	102	exit(1);
	103	}
	104
	105	/* ARGSUSED */
	106	static int
	107	space_delta_cb(dmu_object_type_t bonustype, void *data,
	108	uint64_t userp, uint64_t groupp)
	109	{
	110	/*
	111	* Is it a valid type of object to track?
	112	*/
	113	if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
	114	return (ENOENT);
	115	(void) fprintf(stderr, "modifying object that needs user accounting");
	116	abort();
	117	/* NOTREACHED */
	118	}
	119
	120	/*
	121	* Target is the dataset whose pool we want to open.
	122	*/
	123	static void
379ca9cf	124	zhack_import(char *target, boolean_t readonly)
9ae529ec CS	125	{
9ae529ec CS	126	nvlist_t *config;
9ae529ec	127	nvlist_t *props;
379ca9cf	128	int error;
9ae529ec CS	129
	130	kernel_init(readonly ? FREAD : (FREAD \| FWRITE));
	131	g_zfs = libzfs_init();
	132	ASSERT(g_zfs != NULL);
	133
	134	dmu_objset_register_type(DMU_OST_ZFS, space_delta_cb);
	135
	136	g_readonly = readonly;
9ae529ec CS	137	g_importargs.unique = B_TRUE;
	138	g_importargs.can_be_active = readonly;
	139	g_pool = strdup(target);
9ae529ec	140
379ca9cf OF	141	error = zpool_tryimport(g_zfs, target, &config, &g_importargs);
	142	if (error)
	143	fatal(NULL, FTAG, "cannot import '%s': %s", target,
	144	libzfs_error_description(g_zfs));
9ae529ec CS	145
	146	props = NULL;
	147	if (readonly) {
	148	VERIFY(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0);
	149	VERIFY(nvlist_add_uint64(props,
	150	zpool_prop_to_name(ZPOOL_PROP_READONLY), 1) == 0);
	151	}
	152
	153	zfeature_checks_disable = B_TRUE;
379ca9cf	154	error = spa_import(target, config, props, ZFS_IMPORT_NORMAL);
9ae529ec CS	155	zfeature_checks_disable = B_FALSE;
	156	if (error == EEXIST)
	157	error = 0;
	158
	159	if (error)
379ca9cf	160	fatal(NULL, FTAG, "can't import '%s': %s", target,
2fbc542e	161	strerror(error));
9ae529ec CS	162	}
	163
	164	static void
379ca9cf	165	zhack_spa_open(char target, boolean_t readonly, void tag, spa_t **spa)
9ae529ec CS	166	{
	167	int err;
	168
379ca9cf	169	zhack_import(target, readonly);
9ae529ec CS	170
	171	zfeature_checks_disable = B_TRUE;
	172	err = spa_open(target, spa, tag);
	173	zfeature_checks_disable = B_FALSE;
	174
	175	if (err != 0)
2fbc542e GW	176	fatal(*spa, FTAG, "cannot open '%s': %s", target,
2fbc542e GW	177	strerror(err));
9ae529ec	178	if (spa_version(*spa) < SPA_VERSION_FEATURES) {
2fbc542e GW	179	fatal(*spa, FTAG, "'%s' has version %d, features not enabled",
2fbc542e GW	180	target, (int)spa_version(*spa));
9ae529ec CS	181	}
	182	}
	183
	184	static void
	185	dump_obj(objset_t os, uint64_t obj, const char name)
	186	{
	187	zap_cursor_t zc;
	188	zap_attribute_t za;
	189
	190	(void) printf("%s_obj:\n", name);
	191
	192	for (zap_cursor_init(&zc, os, obj);
	193	zap_cursor_retrieve(&zc, &za) == 0;
	194	zap_cursor_advance(&zc)) {
	195	if (za.za_integer_length == 8) {
	196	ASSERT(za.za_num_integers == 1);
	197	(void) printf("\t%s = %llu\n",
	198	za.za_name, (u_longlong_t)za.za_first_integer);
	199	} else {
	200	ASSERT(za.za_integer_length == 1);
	201	char val[1024];
	202	VERIFY(zap_lookup(os, obj, za.za_name,
	203	1, sizeof (val), val) == 0);
	204	(void) printf("\t%s = %s\n", za.za_name, val);
	205	}
	206	}
	207	zap_cursor_fini(&zc);
	208	}
	209
	210	static void
	211	dump_mos(spa_t *spa)
	212	{
	213	nvlist_t *nv = spa->spa_label_features;
	214	nvpair_t *pair;
	215
	216	(void) printf("label config:\n");
	217	for (pair = nvlist_next_nvpair(nv, NULL);
	218	pair != NULL;
	219	pair = nvlist_next_nvpair(nv, pair)) {
	220	(void) printf("\t%s\n", nvpair_name(pair));
	221	}
	222	}
	223
	224	static void
	225	zhack_do_feature_stat(int argc, char **argv)
	226	{
	227	spa_t *spa;
	228	objset_t *os;
	229	char *target;
	230
	231	argc--;
	232	argv++;
	233
	234	if (argc < 1) {
	235	(void) fprintf(stderr, "error: missing pool name\n");
	236	usage();
	237	}
	238	target = argv[0];
	239
	240	zhack_spa_open(target, B_TRUE, FTAG, &spa);
	241	os = spa->spa_meta_objset;
	242
	243	dump_obj(os, spa->spa_feat_for_read_obj, "for_read");
	244	dump_obj(os, spa->spa_feat_for_write_obj, "for_write");
245	dump_obj(os, spa->spa_feat_desc_obj, "descriptions");
b0bc7a84 MG	246	if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) {
	247	dump_obj(os, spa->spa_feat_enabled_txg_obj, "enabled_txg");
	248	}
9ae529ec CS	249	dump_mos(spa);
	250
	251	spa_close(spa, FTAG);
	252	}
	253
	254	static void
fa86b5db	255	zhack_feature_enable_sync(void arg, dmu_tx_t tx)
9ae529ec	256	{
13fe0198 MA	257	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
13fe0198 MA	258	zfeature_info_t *feature = arg;
9ae529ec	259
fa86b5db MA	260	feature_enable_sync(spa, feature, tx);
fa86b5db MA	261
6f1ffb06	262	spa_history_log_internal(spa, "zhack enable feature", tx,
241b5415 MA	263	"name=%s flags=%u",
241b5415 MA	264	feature->fi_guid, feature->fi_flags);
9ae529ec CS	265	}
	266
	267	static void
	268	zhack_do_feature_enable(int argc, char **argv)
	269	{
	270	char c;
	271	char desc, target;
	272	spa_t *spa;
	273	objset_t *mos;
	274	zfeature_info_t feature;
fa86b5db	275	spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
9ae529ec CS	276
	277	/*
	278	* Features are not added to the pool's label until their refcounts
	279	* are incremented, so fi_mos can just be left as false for now.
	280	*/
	281	desc = NULL;
	282	feature.fi_uname = "zhack";
241b5415	283	feature.fi_flags = 0;
9ae529ec	284	feature.fi_depends = nodeps;
b0bc7a84	285	feature.fi_feature = SPA_FEATURE_NONE;
9ae529ec CS	286
9ae529ec CS	287	optind = 1;
9d69e9b2	288	while ((c = getopt(argc, argv, "+rd:")) != -1) {
9ae529ec CS	289	switch (c) {
9ae529ec CS	290	case 'r':
241b5415	291	feature.fi_flags \|= ZFEATURE_FLAG_READONLY_COMPAT;
9ae529ec CS	292	break;
	293	case 'd':
	294	desc = strdup(optarg);
	295	break;
	296	default:
	297	usage();
	298	break;
	299	}
	300	}
	301
	302	if (desc == NULL)
	303	desc = strdup("zhack injected");
	304	feature.fi_desc = desc;
	305
	306	argc -= optind;
	307	argv += optind;
	308
	309	if (argc < 2) {
	310	(void) fprintf(stderr, "error: missing feature or pool name\n");
	311	usage();
	312	}
	313	target = argv[0];
	314	feature.fi_guid = argv[1];
	315
	316	if (!zfeature_is_valid_guid(feature.fi_guid))
2fbc542e	317	fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid);
9ae529ec CS	318
	319	zhack_spa_open(target, B_FALSE, FTAG, &spa);
	320	mos = spa->spa_meta_objset;
	321
ada82581 BB	322	if (zfeature_is_supported(feature.fi_guid))
ada82581 BB	323	fatal(spa, FTAG, "'%s' is a real feature, will not enable");
9ae529ec	324	if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid))
2fbc542e GW	325	fatal(spa, FTAG, "feature already enabled: %s",
2fbc542e GW	326	feature.fi_guid);
9ae529ec	327
13fe0198	328	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
3d45fdd6	329	zhack_feature_enable_sync, &feature, 5, ZFS_SPACE_CHECK_NORMAL));
9ae529ec CS	330
	331	spa_close(spa, FTAG);
	332
	333	free(desc);
	334	}
	335
	336	static void
13fe0198	337	feature_incr_sync(void arg, dmu_tx_t tx)
9ae529ec	338	{
13fe0198 MA	339	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
13fe0198 MA	340	zfeature_info_t *feature = arg;
fa86b5db	341	uint64_t refcount;
9ae529ec	342
b0bc7a84	343	VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
fa86b5db	344	feature_sync(spa, feature, refcount + 1, tx);
6f1ffb06 MA	345	spa_history_log_internal(spa, "zhack feature incr", tx,
6f1ffb06 MA	346	"name=%s", feature->fi_guid);
9ae529ec CS	347	}
	348
	349	static void
13fe0198	350	feature_decr_sync(void arg, dmu_tx_t tx)
9ae529ec	351	{
13fe0198 MA	352	spa_t *spa = dmu_tx_pool(tx)->dp_spa;
13fe0198 MA	353	zfeature_info_t *feature = arg;
fa86b5db	354	uint64_t refcount;
9ae529ec	355
b0bc7a84	356	VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
fa86b5db	357	feature_sync(spa, feature, refcount - 1, tx);
6f1ffb06 MA	358	spa_history_log_internal(spa, "zhack feature decr", tx,
6f1ffb06 MA	359	"name=%s", feature->fi_guid);
9ae529ec CS	360	}
	361
	362	static void
	363	zhack_do_feature_ref(int argc, char **argv)
	364	{
	365	char c;
	366	char *target;
	367	boolean_t decr = B_FALSE;
	368	spa_t *spa;
	369	objset_t *mos;
	370	zfeature_info_t feature;
fa86b5db	371	spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
9ae529ec CS	372
	373	/*
	374	* fi_desc does not matter here because it was written to disk
	375	* when the feature was enabled, but we need to properly set the
	376	* feature for read or write based on the information we read off
	377	* disk later.
	378	*/
	379	feature.fi_uname = "zhack";
241b5415	380	feature.fi_flags = 0;
9ae529ec CS	381	feature.fi_desc = NULL;
9ae529ec CS	382	feature.fi_depends = nodeps;
b0bc7a84	383	feature.fi_feature = SPA_FEATURE_NONE;
9ae529ec CS	384
9ae529ec CS	385	optind = 1;
9d69e9b2	386	while ((c = getopt(argc, argv, "+md")) != -1) {
9ae529ec CS	387	switch (c) {
9ae529ec CS	388	case 'm':
241b5415	389	feature.fi_flags \|= ZFEATURE_FLAG_MOS;
9ae529ec CS	390	break;
	391	case 'd':
	392	decr = B_TRUE;
	393	break;
	394	default:
	395	usage();
	396	break;
	397	}
	398	}
	399	argc -= optind;
	400	argv += optind;
	401
	402	if (argc < 2) {
	403	(void) fprintf(stderr, "error: missing feature or pool name\n");
	404	usage();
	405	}
	406	target = argv[0];
	407	feature.fi_guid = argv[1];
	408
	409	if (!zfeature_is_valid_guid(feature.fi_guid))
2fbc542e	410	fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid);
9ae529ec CS	411
	412	zhack_spa_open(target, B_FALSE, FTAG, &spa);
	413	mos = spa->spa_meta_objset;
	414
fa86b5db MA	415	if (zfeature_is_supported(feature.fi_guid)) {
	416	fatal(spa, FTAG,
	417	"'%s' is a real feature, will not change refcount");
	418	}
9ae529ec CS	419
	420	if (0 == zap_contains(mos, spa->spa_feat_for_read_obj,
	421	feature.fi_guid)) {
241b5415	422	feature.fi_flags &= ~ZFEATURE_FLAG_READONLY_COMPAT;
9ae529ec CS	423	} else if (0 == zap_contains(mos, spa->spa_feat_for_write_obj,
9ae529ec CS	424	feature.fi_guid)) {
241b5415	425	feature.fi_flags \|= ZFEATURE_FLAG_READONLY_COMPAT;
9ae529ec	426	} else {
2fbc542e	427	fatal(spa, FTAG, "feature is not enabled: %s", feature.fi_guid);
9ae529ec CS	428	}
9ae529ec CS	429
fa86b5db MA	430	if (decr) {
fa86b5db MA	431	uint64_t count;
b0bc7a84	432	if (feature_get_refcount_from_disk(spa, &feature,
72c407f8	433	&count) == 0 && count == 0) {
fa86b5db MA	434	fatal(spa, FTAG, "feature refcount already 0: %s",
	435	feature.fi_guid);
	436	}
	437	}
9ae529ec	438
13fe0198	439	VERIFY0(dsl_sync_task(spa_name(spa), NULL,
3d45fdd6 MA	440	decr ? feature_decr_sync : feature_incr_sync, &feature,
3d45fdd6 MA	441	5, ZFS_SPACE_CHECK_NORMAL));
9ae529ec CS	442
	443	spa_close(spa, FTAG);
	444	}
	445
	446	static int
	447	zhack_do_feature(int argc, char **argv)
	448	{
	449	char *subcommand;
	450
	451	argc--;
	452	argv++;
	453	if (argc == 0) {
	454	(void) fprintf(stderr,
	455	"error: no feature operation specified\n");
	456	usage();
	457	}
	458
	459	subcommand = argv[0];
	460	if (strcmp(subcommand, "stat") == 0) {
	461	zhack_do_feature_stat(argc, argv);
	462	} else if (strcmp(subcommand, "enable") == 0) {
	463	zhack_do_feature_enable(argc, argv);
	464	} else if (strcmp(subcommand, "ref") == 0) {
	465	zhack_do_feature_ref(argc, argv);
	466	} else {
	467	(void) fprintf(stderr, "error: unknown subcommand: %s\n",
	468	subcommand);
	469	usage();
	470	}
	471
	472	return (0);
	473	}
	474
	475	#define MAX_NUM_PATHS 1024
	476
	477	int
	478	main(int argc, char **argv)
	479	{
	480	extern void zfs_prop_init(void);
	481
	482	char *path[MAX_NUM_PATHS];
	483	const char *subcommand;
	484	int rv = 0;
	485	char c;
	486
	487	g_importargs.path = path;
	488
	489	dprintf_setup(&argc, argv);
	490	zfs_prop_init();
	491
9d69e9b2	492	while ((c = getopt(argc, argv, "+c:d:")) != -1) {
9ae529ec CS	493	switch (c) {
	494	case 'c':
	495	g_importargs.cachefile = optarg;
	496	break;
	497	case 'd':
	498	assert(g_importargs.paths < MAX_NUM_PATHS);
	499	g_importargs.path[g_importargs.paths++] = optarg;
	500	break;
	501	default:
	502	usage();
	503	break;
	504	}
	505	}
	506
	507	argc -= optind;
	508	argv += optind;
	509	optind = 1;
	510
	511	if (argc == 0) {
	512	(void) fprintf(stderr, "error: no command specified\n");
	513	usage();
	514	}
	515
	516	subcommand = argv[0];
	517
	518	if (strcmp(subcommand, "feature") == 0) {
	519	rv = zhack_do_feature(argc, argv);
	520	} else {
	521	(void) fprintf(stderr, "error: unknown subcommand: %s\n",
	522	subcommand);
	523	usage();
	524	}
	525
2fbc542e GW	526	if (!g_readonly && spa_export(g_pool, NULL, B_TRUE, B_FALSE) != 0) {
2fbc542e GW	527	fatal(NULL, FTAG, "pool export failed; "
9ae529ec CS	528	"changes may not be committed to disk\n");
	529	}
	530
	531	libzfs_fini(g_zfs);
	532	kernel_fini();
	533
	534	return (rv);
	535	}