util.c revision f06dce2c1f0f3af78581e7574f65bfba843ddb6e
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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2016 by Delphix. All rights reserved.
24 * Copyright 2017 RackTop Systems.
25 */
26
27#include <assert.h>
28#include <sys/zfs_context.h>
29#include <sys/avl.h>
30#include <string.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <sys/spa.h>
34#include <sys/fs/zfs.h>
35#include <sys/refcount.h>
36#include <dlfcn.h>
37
38extern void nicenum(uint64_t num, char *buf, size_t);
39
40/*
41 * Routines needed by more than one client of libzpool.
42 */
43
44static void
45show_vdev_stats(const char *desc, const char *ctype, nvlist_t *nv, int indent)
46{
47	vdev_stat_t *vs;
48	vdev_stat_t v0 = { 0 };
49	uint64_t sec;
50	uint64_t is_log = 0;
51	nvlist_t **child;
52	uint_t c, children;
53	char used[6], avail[6];
54	char rops[6], wops[6], rbytes[6], wbytes[6], rerr[6], werr[6], cerr[6];
55	char *prefix = "";
56
57	if (indent == 0 && desc != NULL) {
58		(void) printf("                           "
59		    " capacity   operations   bandwidth  ---- errors ----\n");
60		(void) printf("description                "
61		    "used avail  read write  read write  read write cksum\n");
62	}
63
64	if (desc != NULL) {
65		(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
66
67		if (is_log)
68			prefix = "log ";
69
70		if (nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
71		    (uint64_t **)&vs, &c) != 0)
72			vs = &v0;
73
74		sec = MAX(1, vs->vs_timestamp / NANOSEC);
75
76		nicenum(vs->vs_alloc, used, sizeof (used));
77		nicenum(vs->vs_space - vs->vs_alloc, avail, sizeof (avail));
78		nicenum(vs->vs_ops[ZIO_TYPE_READ] / sec, rops, sizeof (rops));
79		nicenum(vs->vs_ops[ZIO_TYPE_WRITE] / sec, wops, sizeof (wops));
80		nicenum(vs->vs_bytes[ZIO_TYPE_READ] / sec, rbytes,
81		    sizeof (rbytes));
82		nicenum(vs->vs_bytes[ZIO_TYPE_WRITE] / sec, wbytes,
83		    sizeof (wbytes));
84		nicenum(vs->vs_read_errors, rerr, sizeof (rerr));
85		nicenum(vs->vs_write_errors, werr, sizeof (werr));
86		nicenum(vs->vs_checksum_errors, cerr, sizeof (cerr));
87
88		(void) printf("%*s%s%*s%*s%*s %5s %5s %5s %5s %5s %5s %5s\n",
89		    indent, "",
90		    prefix,
91		    indent + strlen(prefix) - 25 - (vs->vs_space ? 0 : 12),
92		    desc,
93		    vs->vs_space ? 6 : 0, vs->vs_space ? used : "",
94		    vs->vs_space ? 6 : 0, vs->vs_space ? avail : "",
95		    rops, wops, rbytes, wbytes, rerr, werr, cerr);
96	}
97
98	if (nvlist_lookup_nvlist_array(nv, ctype, &child, &children) != 0)
99		return;
100
101	for (c = 0; c < children; c++) {
102		nvlist_t *cnv = child[c];
103		char *cname, *tname;
104		uint64_t np;
105		if (nvlist_lookup_string(cnv, ZPOOL_CONFIG_PATH, &cname) &&
106		    nvlist_lookup_string(cnv, ZPOOL_CONFIG_TYPE, &cname))
107			cname = "<unknown>";
108		tname = calloc(1, strlen(cname) + 2);
109		(void) strcpy(tname, cname);
110		if (nvlist_lookup_uint64(cnv, ZPOOL_CONFIG_NPARITY, &np) == 0)
111			tname[strlen(tname)] = '0' + np;
112		show_vdev_stats(tname, ctype, cnv, indent + 2);
113		free(tname);
114	}
115}
116
117void
118show_pool_stats(spa_t *spa)
119{
120	nvlist_t *config, *nvroot;
121	char *name;
122
123	VERIFY(spa_get_stats(spa_name(spa), &config, NULL, 0) == 0);
124
125	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
126	    &nvroot) == 0);
127	VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
128	    &name) == 0);
129
130	show_vdev_stats(name, ZPOOL_CONFIG_CHILDREN, nvroot, 0);
131	show_vdev_stats(NULL, ZPOOL_CONFIG_L2CACHE, nvroot, 0);
132	show_vdev_stats(NULL, ZPOOL_CONFIG_SPARES, nvroot, 0);
133
134	nvlist_free(config);
135}
136
137/*
138 * Sets given global variable in libzpool to given unsigned 32-bit value.
139 * arg: "<variable>=<value>"
140 */
141int
142set_global_var(char *arg)
143{
144	void *zpoolhdl;
145	char *varname = arg, *varval;
146	u_longlong_t val;
147
148#ifndef _LITTLE_ENDIAN
149	/*
150	 * On big endian systems changing a 64-bit variable would set the high
151	 * 32 bits instead of the low 32 bits, which could cause unexpected
152	 * results.
153	 */
154	fprintf(stderr, "Setting global variables is only supported on "
155	    "little-endian systems\n", varname);
156	return (ENOTSUP);
157#endif
158	if ((varval = strchr(arg, '=')) != NULL) {
159		*varval = '\0';
160		varval++;
161		val = strtoull(varval, NULL, 0);
162		if (val > UINT32_MAX) {
163			fprintf(stderr, "Value for global variable '%s' must "
164			    "be a 32-bit unsigned integer\n", varname);
165			return (EOVERFLOW);
166		}
167	} else {
168		return (EINVAL);
169	}
170
171	zpoolhdl = dlopen("libzpool.so", RTLD_LAZY);
172	if (zpoolhdl != NULL) {
173		uint32_t *var;
174		var = dlsym(zpoolhdl, varname);
175		if (var == NULL) {
176			fprintf(stderr, "Global variable '%s' does not exist "
177			    "in libzpool.so\n", varname);
178			return (EINVAL);
179		}
180		*var = (uint32_t)val;
181
182		dlclose(zpoolhdl);
183	} else {
184		fprintf(stderr, "Failed to open libzpool.so to set global "
185		    "variable\n");
186		return (EIO);
187	}
188
189	return (0);
190}
191