cmd/zpool/zpool_util.c

   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 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <errno.h>
  27 #include <libgen.h>
  28 #include <libintl.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <strings.h>
  32 #include <ctype.h>
  33
  34 #include "zpool_util.h"
  35
  36 /*
  37  * Utility function to guarantee malloc() success.
  38  */
  39 void *
  40 safe_malloc(size_t size)
  41 {
  42         void *data;
  43
  44         if ((data = calloc(1, size)) == NULL) {
  45                 (void) fprintf(stderr, "internal error: out of memory\n");
  46                 exit(1);
  47         }
  48
  49         return (data);
  50 }
  51
  52 /*
  53  * Utility function to guarantee realloc() success.
  54  */
  55 void *
  56 safe_realloc(void *from, size_t size)
  57 {
  58         void *data;
  59
  60         if ((data = realloc(from, size)) == NULL) {
  61                 (void) fprintf(stderr, "internal error: out of memory\n");
  62                 exit(1);
  63         }
  64
  65         return (data);
  66 }
  67
  68 /*
  69  * Display an out of memory error message and abort the current program.
  70  */
  71 void
  72 zpool_no_memory(void)
  73 {
  74         assert(errno == ENOMEM);
  75         (void) fprintf(stderr,
  76             gettext("internal error: out of memory\n"));
  77         exit(1);
  78 }
  79
  80 /*
  81  * Return the number of logs in supplied nvlist
  82  */
  83 uint_t
  84 num_logs(nvlist_t *nv)
  85 {
  86         uint_t nlogs = 0;
  87         uint_t c, children;
  88         nvlist_t **child;
  89
  90         if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
  91             &child, &children) != 0)
  92                 return (0);
  93
  94         for (c = 0; c < children; c++) {
  95                 uint64_t is_log = B_FALSE;
  96
  97                 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
  98                     &is_log);
  99                 if (is_log)
 100                         nlogs++;
 101         }
 102         return (nlogs);
 103 }
 104
 105 /* Find the max element in an array of uint64_t values */
 106 uint64_t
 107 array64_max(uint64_t array[], unsigned int len)
 108 {
 109         uint64_t max = 0;
 110         int i;
 111         for (i = 0; i < len; i++)
 112                 max = MAX(max, array[i]);
 113
 114         return (max);
 115 }
 116
 117 /*
 118  * Find highest one bit set.
 119  * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
 120  */
 121 int
 122 highbit64(uint64_t i)
 123 {
 124         if (i == 0)
 125                 return (0);
 126
 127         return (NBBY * sizeof (uint64_t) - __builtin_clzll(i));
 128 }
 129
 130 /*
 131  * Find lowest one bit set.
 132  * Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
 133  */
 134 int
 135 lowbit64(uint64_t i)
 136 {
 137         if (i == 0)
 138                 return (0);
 139
 140         return (__builtin_ffsll(i));
 141 }