532 lines
12 KiB
C
532 lines
12 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, 2015 by Delphix. All rights reserved.
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* Copyright (c) 2013 Steven Hartland. All rights reserved.
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*/
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/*
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* zhack is a debugging tool that can write changes to ZFS pool using libzpool
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* for testing purposes. Altering pools with zhack is unsupported and may
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* result in corrupted pools.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/spa_impl.h>
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#include <sys/dmu.h>
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#include <sys/zap.h>
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#include <sys/zfs_znode.h>
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#include <sys/dsl_synctask.h>
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#include <sys/vdev.h>
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#include <sys/fs/zfs.h>
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#include <sys/dmu_objset.h>
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#include <sys/dsl_pool.h>
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#include <sys/zio_checksum.h>
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#include <sys/zio_compress.h>
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#include <sys/zfeature.h>
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#include <sys/dmu_tx.h>
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#include <libzutil.h>
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extern boolean_t zfeature_checks_disable;
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const char cmdname[] = "zhack";
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static importargs_t g_importargs;
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static char *g_pool;
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static boolean_t g_readonly;
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static void
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usage(void)
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{
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(void) fprintf(stderr,
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"Usage: %s [-c cachefile] [-d dir] <subcommand> <args> ...\n"
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"where <subcommand> <args> is one of the following:\n"
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"\n", cmdname);
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(void) fprintf(stderr,
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" feature stat <pool>\n"
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" print information about enabled features\n"
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" feature enable [-r] [-d desc] <pool> <feature>\n"
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" add a new enabled feature to the pool\n"
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" -d <desc> sets the feature's description\n"
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" -r set read-only compatible flag for feature\n"
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" feature ref [-md] <pool> <feature>\n"
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" change the refcount on the given feature\n"
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" -d decrease instead of increase the refcount\n"
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" -m add the feature to the label if increasing refcount\n"
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"\n"
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" <feature> : should be a feature guid\n");
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exit(1);
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}
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static void
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fatal(spa_t *spa, void *tag, const char *fmt, ...)
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{
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va_list ap;
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if (spa != NULL) {
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spa_close(spa, tag);
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(void) spa_export(g_pool, NULL, B_TRUE, B_FALSE);
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}
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va_start(ap, fmt);
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(void) fprintf(stderr, "%s: ", cmdname);
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(void) vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void) fprintf(stderr, "\n");
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exit(1);
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}
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/* ARGSUSED */
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static int
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space_delta_cb(dmu_object_type_t bonustype, void *data,
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uint64_t *userp, uint64_t *groupp, uint64_t *projectp)
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{
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/*
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* Is it a valid type of object to track?
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*/
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if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
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return (ENOENT);
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(void) fprintf(stderr, "modifying object that needs user accounting");
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abort();
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/* NOTREACHED */
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}
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/*
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* Target is the dataset whose pool we want to open.
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*/
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static void
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zhack_import(char *target, boolean_t readonly)
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{
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nvlist_t *config;
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nvlist_t *props;
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int error;
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kernel_init(readonly ? FREAD : (FREAD | FWRITE));
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dmu_objset_register_type(DMU_OST_ZFS, space_delta_cb);
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g_readonly = readonly;
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g_importargs.can_be_active = readonly;
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g_pool = strdup(target);
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error = zpool_find_config(NULL, target, &config, &g_importargs,
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&libzpool_config_ops);
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if (error)
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fatal(NULL, FTAG, "cannot import '%s'", target);
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props = NULL;
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if (readonly) {
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VERIFY(nvlist_alloc(&props, NV_UNIQUE_NAME, 0) == 0);
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VERIFY(nvlist_add_uint64(props,
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zpool_prop_to_name(ZPOOL_PROP_READONLY), 1) == 0);
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}
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zfeature_checks_disable = B_TRUE;
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error = spa_import(target, config, props,
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(readonly ? ZFS_IMPORT_SKIP_MMP : ZFS_IMPORT_NORMAL));
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zfeature_checks_disable = B_FALSE;
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if (error == EEXIST)
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error = 0;
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if (error)
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fatal(NULL, FTAG, "can't import '%s': %s", target,
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strerror(error));
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}
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static void
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zhack_spa_open(char *target, boolean_t readonly, void *tag, spa_t **spa)
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{
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int err;
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zhack_import(target, readonly);
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zfeature_checks_disable = B_TRUE;
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err = spa_open(target, spa, tag);
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zfeature_checks_disable = B_FALSE;
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if (err != 0)
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fatal(*spa, FTAG, "cannot open '%s': %s", target,
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strerror(err));
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if (spa_version(*spa) < SPA_VERSION_FEATURES) {
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fatal(*spa, FTAG, "'%s' has version %d, features not enabled",
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target, (int)spa_version(*spa));
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}
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}
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static void
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dump_obj(objset_t *os, uint64_t obj, const char *name)
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{
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zap_cursor_t zc;
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zap_attribute_t za;
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(void) printf("%s_obj:\n", name);
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for (zap_cursor_init(&zc, os, obj);
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zap_cursor_retrieve(&zc, &za) == 0;
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zap_cursor_advance(&zc)) {
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if (za.za_integer_length == 8) {
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ASSERT(za.za_num_integers == 1);
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(void) printf("\t%s = %llu\n",
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za.za_name, (u_longlong_t)za.za_first_integer);
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} else {
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ASSERT(za.za_integer_length == 1);
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char val[1024];
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VERIFY(zap_lookup(os, obj, za.za_name,
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1, sizeof (val), val) == 0);
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(void) printf("\t%s = %s\n", za.za_name, val);
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}
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}
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zap_cursor_fini(&zc);
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}
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static void
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dump_mos(spa_t *spa)
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{
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nvlist_t *nv = spa->spa_label_features;
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nvpair_t *pair;
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(void) printf("label config:\n");
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for (pair = nvlist_next_nvpair(nv, NULL);
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pair != NULL;
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pair = nvlist_next_nvpair(nv, pair)) {
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(void) printf("\t%s\n", nvpair_name(pair));
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}
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}
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static void
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zhack_do_feature_stat(int argc, char **argv)
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{
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spa_t *spa;
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objset_t *os;
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char *target;
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argc--;
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argv++;
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if (argc < 1) {
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(void) fprintf(stderr, "error: missing pool name\n");
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usage();
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}
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target = argv[0];
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zhack_spa_open(target, B_TRUE, FTAG, &spa);
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os = spa->spa_meta_objset;
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dump_obj(os, spa->spa_feat_for_read_obj, "for_read");
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dump_obj(os, spa->spa_feat_for_write_obj, "for_write");
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dump_obj(os, spa->spa_feat_desc_obj, "descriptions");
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if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) {
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dump_obj(os, spa->spa_feat_enabled_txg_obj, "enabled_txg");
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}
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dump_mos(spa);
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spa_close(spa, FTAG);
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}
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static void
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zhack_feature_enable_sync(void *arg, dmu_tx_t *tx)
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{
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spa_t *spa = dmu_tx_pool(tx)->dp_spa;
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zfeature_info_t *feature = arg;
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feature_enable_sync(spa, feature, tx);
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spa_history_log_internal(spa, "zhack enable feature", tx,
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"name=%s flags=%u",
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feature->fi_guid, feature->fi_flags);
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}
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static void
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zhack_do_feature_enable(int argc, char **argv)
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{
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int c;
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char *desc, *target;
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spa_t *spa;
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objset_t *mos;
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zfeature_info_t feature;
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spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
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/*
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* Features are not added to the pool's label until their refcounts
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* are incremented, so fi_mos can just be left as false for now.
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*/
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desc = NULL;
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feature.fi_uname = "zhack";
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feature.fi_flags = 0;
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feature.fi_depends = nodeps;
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feature.fi_feature = SPA_FEATURE_NONE;
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optind = 1;
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while ((c = getopt(argc, argv, "+rd:")) != -1) {
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switch (c) {
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case 'r':
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feature.fi_flags |= ZFEATURE_FLAG_READONLY_COMPAT;
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break;
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case 'd':
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desc = strdup(optarg);
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break;
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default:
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usage();
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break;
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}
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}
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if (desc == NULL)
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desc = strdup("zhack injected");
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feature.fi_desc = desc;
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argc -= optind;
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argv += optind;
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if (argc < 2) {
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(void) fprintf(stderr, "error: missing feature or pool name\n");
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usage();
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}
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target = argv[0];
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feature.fi_guid = argv[1];
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if (!zfeature_is_valid_guid(feature.fi_guid))
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fatal(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid);
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zhack_spa_open(target, B_FALSE, FTAG, &spa);
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mos = spa->spa_meta_objset;
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if (zfeature_is_supported(feature.fi_guid))
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fatal(spa, FTAG, "'%s' is a real feature, will not enable");
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if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid))
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fatal(spa, FTAG, "feature already enabled: %s",
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feature.fi_guid);
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VERIFY0(dsl_sync_task(spa_name(spa), NULL,
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zhack_feature_enable_sync, &feature, 5, ZFS_SPACE_CHECK_NORMAL));
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spa_close(spa, FTAG);
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free(desc);
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}
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static void
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feature_incr_sync(void *arg, dmu_tx_t *tx)
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{
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spa_t *spa = dmu_tx_pool(tx)->dp_spa;
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zfeature_info_t *feature = arg;
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uint64_t refcount;
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VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
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feature_sync(spa, feature, refcount + 1, tx);
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spa_history_log_internal(spa, "zhack feature incr", tx,
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"name=%s", feature->fi_guid);
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}
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static void
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feature_decr_sync(void *arg, dmu_tx_t *tx)
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{
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spa_t *spa = dmu_tx_pool(tx)->dp_spa;
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zfeature_info_t *feature = arg;
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uint64_t refcount;
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VERIFY0(feature_get_refcount_from_disk(spa, feature, &refcount));
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feature_sync(spa, feature, refcount - 1, tx);
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spa_history_log_internal(spa, "zhack feature decr", tx,
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"name=%s", feature->fi_guid);
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}
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static void
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zhack_do_feature_ref(int argc, char **argv)
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{
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int c;
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char *target;
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boolean_t decr = B_FALSE;
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spa_t *spa;
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objset_t *mos;
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zfeature_info_t feature;
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spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
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/*
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* 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;
|
||
|
|
int 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");
|
||
|
|
}
|
||
|
|
|
||
|
|
kernel_fini();
|
||
|
|
|
||
|
|
return (rv);
|
||
|
|
}
|