util.c revision 0a0551200ecbcd4f1b17560acaeeb7b6c8b0090e
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 */
25
26#include <assert.h>
27#include <sys/zfs_context.h>
28#include <sys/avl.h>
29#include <string.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <sys/spa.h>
33#include <sys/fs/zfs.h>
34#include <sys/refcount.h>
35#include <dlfcn.h>
36
37/*
38 * Routines needed by more than one client of libzpool.
39 */
40
41static void
42show_vdev_stats(const char *desc, const char *ctype, nvlist_t *nv, int indent)
43{
44	vdev_stat_t *vs;
45	vdev_stat_t v0 = { 0 };
46	uint64_t sec;
47	uint64_t is_log = 0;
48	nvlist_t **child;
49	uint_t c, children;
50	char used[6], avail[6];
51	char rops[6], wops[6], rbytes[6], wbytes[6], rerr[6], werr[6], cerr[6];
52	char *prefix = "";
53
54	if (indent == 0 && desc != NULL) {
55		(void) printf("                           "
56		    " capacity   operations   bandwidth  ---- errors ----\n");
57		(void) printf("description                "
58		    "used avail  read write  read write  read write cksum\n");
59	}
60
61	if (desc != NULL) {
62		(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &is_log);
63
64		if (is_log)
65			prefix = "log ";
66
67		if (nvlist_lookup_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS,
68		    (uint64_t **)&vs, &c) != 0)
69			vs = &v0;
70
71		sec = MAX(1, vs->vs_timestamp / NANOSEC);
72
73		nicenum(vs->vs_alloc, used, sizeof (used));
74		nicenum(vs->vs_space - vs->vs_alloc, avail, sizeof (avail));
75		nicenum(vs->vs_ops[ZIO_TYPE_READ] / sec, rops, sizeof (rops));
76		nicenum(vs->vs_ops[ZIO_TYPE_WRITE] / sec, wops, sizeof (wops));
77		nicenum(vs->vs_bytes[ZIO_TYPE_READ] / sec, rbytes,
78		    sizeof (rbytes));
79		nicenum(vs->vs_bytes[ZIO_TYPE_WRITE] / sec, wbytes,
80		    sizeof (wbytes));
81		nicenum(vs->vs_read_errors, rerr, sizeof (rerr));
82		nicenum(vs->vs_write_errors, werr, sizeof (werr));
83		nicenum(vs->vs_checksum_errors, cerr, sizeof (cerr));
84
85		(void) printf("%*s%s%*s%*s%*s %5s %5s %5s %5s %5s %5s %5s\n",
86		    indent, "",
87		    prefix,
88		    indent + strlen(prefix) - 25 - (vs->vs_space ? 0 : 12),
89		    desc,
90		    vs->vs_space ? 6 : 0, vs->vs_space ? used : "",
91		    vs->vs_space ? 6 : 0, vs->vs_space ? avail : "",
92		    rops, wops, rbytes, wbytes, rerr, werr, cerr);
93	}
94
95	if (nvlist_lookup_nvlist_array(nv, ctype, &child, &children) != 0)
96		return;
97
98	for (c = 0; c < children; c++) {
99		nvlist_t *cnv = child[c];
100		char *cname, *tname;
101		uint64_t np;
102		if (nvlist_lookup_string(cnv, ZPOOL_CONFIG_PATH, &cname) &&
103		    nvlist_lookup_string(cnv, ZPOOL_CONFIG_TYPE, &cname))
104			cname = "<unknown>";
105		tname = calloc(1, strlen(cname) + 2);
106		(void) strcpy(tname, cname);
107		if (nvlist_lookup_uint64(cnv, ZPOOL_CONFIG_NPARITY, &np) == 0)
108			tname[strlen(tname)] = '0' + np;
109		show_vdev_stats(tname, ctype, cnv, indent + 2);
110		free(tname);
111	}
112}
113
114void
115show_pool_stats(spa_t *spa)
116{
117	nvlist_t *config, *nvroot;
118	char *name;
119
120	VERIFY(spa_get_stats(spa_name(spa), &config, NULL, 0) == 0);
121
122	VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
123	    &nvroot) == 0);
124	VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME,
125	    &name) == 0);
126
127	show_vdev_stats(name, ZPOOL_CONFIG_CHILDREN, nvroot, 0);
128	show_vdev_stats(NULL, ZPOOL_CONFIG_L2CACHE, nvroot, 0);
129	show_vdev_stats(NULL, ZPOOL_CONFIG_SPARES, nvroot, 0);
130
131	nvlist_free(config);
132}
133
134/*
135 * Sets given global variable in libzpool to given unsigned 32-bit value.
136 * arg: "<variable>=<value>"
137 */
138int
139set_global_var(char *arg)
140{
141	void *zpoolhdl;
142	char *varname = arg, *varval;
143	u_longlong_t val;
144
145#ifndef _LITTLE_ENDIAN
146	/*
147	 * On big endian systems changing a 64-bit variable would set the high
148	 * 32 bits instead of the low 32 bits, which could cause unexpected
149	 * results.
150	 */
151	fprintf(stderr, "Setting global variables is only supported on "
152	    "little-endian systems\n", varname);
153	return (ENOTSUP);
154#endif
155	if ((varval = strchr(arg, '=')) != NULL) {
156		*varval = '\0';
157		varval++;
158		val = strtoull(varval, NULL, 0);
159		if (val > UINT32_MAX) {
160			fprintf(stderr, "Value for global variable '%s' must "
161			    "be a 32-bit unsigned integer\n", varname);
162			return (EOVERFLOW);
163		}
164	} else {
165		return (EINVAL);
166	}
167
168	zpoolhdl = dlopen("libzpool.so", RTLD_LAZY);
169	if (zpoolhdl != NULL) {
170		uint32_t *var;
171		var = dlsym(zpoolhdl, varname);
172		if (var == NULL) {
173			fprintf(stderr, "Global variable '%s' does not exist "
174			    "in libzpool.so\n", varname);
175			return (EINVAL);
176		}
177		*var = (uint32_t)val;
178
179		dlclose(zpoolhdl);
180	} else {
181		fprintf(stderr, "Failed to open libzpool.so to set global "
182		    "variable\n");
183		return (EIO);
184	}
185
186	return (0);
187}
188