/*
 * 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 https://opensource.org/licenses/CDDL-1.0.
 * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2016 by Delphix. All rights reserved.
 * Copyright 2017 Jason King
 * Copyright (c) 2017, Intel Corporation.
 */

#include <assert.h>
#include <sys/zfs_context.h>
#include <sys/avl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/spa.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_refcount.h>
#include <sys/zfs_ioctl.h>
#include <dlfcn.h>
#include <libzutil.h>

/*
 * Routines needed by more than one client of libzpool.
 */

static void
show_vdev_stats(const char *desc, const char *ctype, nvlist_t *nv, int indent)
{
	vdev_stat_t *vs;
	vdev_stat_t *v0 = { 0 };
	uint64_t sec;
	uint64_t is_log = 0;
	nvlist_t **child;
	uint_t c, children;
	char used[6], avail[6];
	char rops[6], wops[6], rbytes[6], wbytes[6], rerr[6], werr[6], cerr[6];

	v0 = umem_zalloc(sizeof (*v0), UMEM_NOFAIL);

	if (indent == 0 && desc != NULL) {
		(void) printf("                           "
		    " capacity   operations   bandwidth  ---- errors ----\n");
		(void) printf("description                "
		    "used avail  read write  read write  read write cksum\n");
	}

	if (desc != NULL) {
		const char *suffix = "";
		char *bias = NULL;
		char bias_suffix[32];

		(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
		(void) nvlist_lookup_string(nv, ZPOOL_CONFIG_ALLOCATION_BIAS,
		    &bias);
		if (nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
		    (uint64_t **)&vs, &c) != 0)
			vs = v0;

		if (bias != NULL) {
			(void) snprintf(bias_suffix, sizeof (bias_suffix),
			    " (%s)", bias);
			suffix = bias_suffix;
		} else if (is_log) {
			suffix = " (log)";
		}

		sec = MAX(1, vs->vs_timestamp / NANOSEC);

		nicenum(vs->vs_alloc, used, sizeof (used));
		nicenum(vs->vs_space - vs->vs_alloc, avail, sizeof (avail));
		nicenum(vs->vs_ops[ZIO_TYPE_READ] / sec, rops, sizeof (rops));
		nicenum(vs->vs_ops[ZIO_TYPE_WRITE] / sec, wops, sizeof (wops));
		nicenum(vs->vs_bytes[ZIO_TYPE_READ] / sec, rbytes,
		    sizeof (rbytes));
		nicenum(vs->vs_bytes[ZIO_TYPE_WRITE] / sec, wbytes,
		    sizeof (wbytes));
		nicenum(vs->vs_read_errors, rerr, sizeof (rerr));
		nicenum(vs->vs_write_errors, werr, sizeof (werr));
		nicenum(vs->vs_checksum_errors, cerr, sizeof (cerr));

		(void) printf("%*s%s%*s%*s%*s %5s %5s %5s %5s %5s %5s %5s\n",
		    indent, "",
		    desc,
		    (int)(indent+strlen(desc)-25-(vs->vs_space ? 0 : 12)),
		    suffix,
		    vs->vs_space ? 6 : 0, vs->vs_space ? used : "",
		    vs->vs_space ? 6 : 0, vs->vs_space ? avail : "",
		    rops, wops, rbytes, wbytes, rerr, werr, cerr);
	}
	umem_free(v0, sizeof (*v0));

	if (nvlist_lookup_nvlist_array(nv, ctype, &child, &children) != 0)
		return;

	for (c = 0; c < children; c++) {
		nvlist_t *cnv = child[c];
		char *cname = NULL, *tname;
		uint64_t np;
		int len;
		if (nvlist_lookup_string(cnv, ZPOOL_CONFIG_PATH, &cname) &&
		    nvlist_lookup_string(cnv, ZPOOL_CONFIG_TYPE, &cname))
			cname = (char *)"<unknown>";
		len = strlen(cname) + 2;
		tname = umem_zalloc(len, UMEM_NOFAIL);
		(void) strlcpy(tname, cname, len);
		if (nvlist_lookup_uint64(cnv, ZPOOL_CONFIG_NPARITY, &np) == 0)
			tname[strlen(tname)] = '0' + np;
		show_vdev_stats(tname, ctype, cnv, indent + 2);
		umem_free(tname, len);
	}
}

void
show_pool_stats(spa_t *spa)
{
	nvlist_t *config, *nvroot;
	char *name;

	VERIFY(spa_get_stats(spa_name(spa), &config, NULL, 0) == 0);

	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
	    &nvroot) == 0);
	VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
	    &name) == 0);

	show_vdev_stats(name, ZPOOL_CONFIG_CHILDREN, nvroot, 0);
	show_vdev_stats(NULL, ZPOOL_CONFIG_L2CACHE, nvroot, 0);
	show_vdev_stats(NULL, ZPOOL_CONFIG_SPARES, nvroot, 0);

	nvlist_free(config);
}

/* *k_out must be freed by the caller */
static int
set_global_var_parse_kv(const char *arg, char **k_out, u_longlong_t *v_out)
{
	int err;
	VERIFY(arg);
	char *d = strdup(arg);

	char *save = NULL;
	char *k = strtok_r(d, "=", &save);
	char *v_str = strtok_r(NULL, "=", &save);
	char *follow = strtok_r(NULL, "=", &save);
	if (k == NULL || v_str == NULL || follow != NULL) {
		err = EINVAL;
		goto err_free;
	}

	u_longlong_t val = strtoull(v_str, NULL, 0);
	if (val > UINT32_MAX) {
		fprintf(stderr, "Value for global variable '%s' must "
		    "be a 32-bit unsigned integer, got '%s'\n", k, v_str);
		err = EOVERFLOW;
		goto err_free;
	}

	*k_out = strdup(k);
	*v_out = val;
	free(d);
	return (0);

err_free:
	free(d);

	return (err);
}

/*
 * Sets given global variable in libzpool to given unsigned 32-bit value.
 * arg: "<variable>=<value>"
 */
int
set_global_var(char const *arg)
{
	void *zpoolhdl;
	char *varname;
	u_longlong_t val;
	int ret;

#ifndef _ZFS_LITTLE_ENDIAN
	/*
	 * On big endian systems changing a 64-bit variable would set the high
	 * 32 bits instead of the low 32 bits, which could cause unexpected
	 * results.
	 */
	fprintf(stderr, "Setting global variables is only supported on "
	    "little-endian systems\n");
	ret = ENOTSUP;
	goto out_ret;
#endif

	if ((ret = set_global_var_parse_kv(arg, &varname, &val)) != 0) {
		goto out_ret;
	}

	zpoolhdl = dlopen("libzpool.so", RTLD_LAZY);
	if (zpoolhdl != NULL) {
		uint32_t *var;
		var = dlsym(zpoolhdl, varname);
		if (var == NULL) {
			fprintf(stderr, "Global variable '%s' does not exist "
			    "in libzpool.so\n", varname);
			ret = EINVAL;
			goto out_dlclose;
		}
		*var = (uint32_t)val;

	} else {
		fprintf(stderr, "Failed to open libzpool.so to set global "
		    "variable\n");
		ret = EIO;
		goto out_free;
	}

	ret = 0;

out_dlclose:
	dlclose(zpoolhdl);
out_free:
	free(varname);
out_ret:
	return (ret);
}

static nvlist_t *
refresh_config(void *unused, nvlist_t *tryconfig)
{
	(void) unused;
	return (spa_tryimport(tryconfig));
}

#if defined(__FreeBSD__)

#include <sys/param.h>
#include <sys/sysctl.h>
#include <os/freebsd/zfs/sys/zfs_ioctl_compat.h>

static int
pool_active(void *unused, const char *name, uint64_t guid, boolean_t *isactive)
{
	(void) unused, (void) guid;
	zfs_iocparm_t zp;
	zfs_cmd_t *zc = NULL;
#ifdef ZFS_LEGACY_SUPPORT
	zfs_cmd_legacy_t *zcl = NULL;
#endif
	unsigned long request;
	int ret;

	int fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
	if (fd < 0)
		return (-1);

	/*
	 * Use ZFS_IOC_POOL_STATS to check if the pool is active.  We want to
	 * avoid adding a dependency on libzfs_core solely for this ioctl(),
	 * therefore we manually craft the stats command.  Note that the command
	 * ID is identical between the openzfs and legacy ioctl() formats.
	 */
	int ver = ZFS_IOCVER_NONE;
	size_t ver_size = sizeof (ver);

	sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0);

	switch (ver) {
	case ZFS_IOCVER_OZFS:
		zc = umem_zalloc(sizeof (zfs_cmd_t), UMEM_NOFAIL);

		(void) strlcpy(zc->zc_name, name, sizeof (zc->zc_name));
		zp.zfs_cmd = (uint64_t)(uintptr_t)zc;
		zp.zfs_cmd_size = sizeof (zfs_cmd_t);
		zp.zfs_ioctl_version = ZFS_IOCVER_OZFS;

		request = _IOWR('Z', ZFS_IOC_POOL_STATS, zfs_iocparm_t);
		ret = ioctl(fd, request, &zp);

		free((void *)(uintptr_t)zc->zc_nvlist_dst);
		umem_free(zc, sizeof (zfs_cmd_t));

		break;
#ifdef ZFS_LEGACY_SUPPORT
	case ZFS_IOCVER_LEGACY:
		zcl = umem_zalloc(sizeof (zfs_cmd_legacy_t), UMEM_NOFAIL);

		(void) strlcpy(zcl->zc_name, name, sizeof (zcl->zc_name));
		zp.zfs_cmd = (uint64_t)(uintptr_t)zcl;
		zp.zfs_cmd_size = sizeof (zfs_cmd_legacy_t);
		zp.zfs_ioctl_version = ZFS_IOCVER_LEGACY;

		request = _IOWR('Z', ZFS_IOC_POOL_STATS, zfs_iocparm_t);
		ret = ioctl(fd, request, &zp);

		free((void *)(uintptr_t)zcl->zc_nvlist_dst);
		umem_free(zcl, sizeof (zfs_cmd_legacy_t));

		break;
#endif
	default:
		fprintf(stderr, "unrecognized zfs ioctl version %d", ver);
		exit(1);
	}

	(void) close(fd);

	*isactive = (ret == 0);

	return (0);
}
#else
static int
pool_active(void *unused, const char *name, uint64_t guid,
    boolean_t *isactive)
{
	(void) unused, (void) guid;
	int fd = open(ZFS_DEV, O_RDWR | O_CLOEXEC);
	if (fd < 0)
		return (-1);

	/*
	 * Use ZFS_IOC_POOL_STATS to check if a pool is active.
	 */
	zfs_cmd_t *zcp = umem_zalloc(sizeof (zfs_cmd_t), UMEM_NOFAIL);
	(void) strlcpy(zcp->zc_name, name, sizeof (zcp->zc_name));

	int ret = ioctl(fd, ZFS_IOC_POOL_STATS, zcp);

	free((void *)(uintptr_t)zcp->zc_nvlist_dst);
	umem_free(zcp, sizeof (zfs_cmd_t));

	(void) close(fd);

	*isactive = (ret == 0);

	return (0);
}
#endif

pool_config_ops_t libzpool_config_ops = {
	.pco_refresh_config = refresh_config,
	.pco_pool_active = pool_active,
};