zfs/zcmd/zpool/zpool_iter.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 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <libintl.h>
  29 #include <libuutil.h>
  30 #include <stddef.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <strings.h>
  34
  35 #include <libzfs.h>
  36
  37 #include "zpool_util.h"
  38
  39 /*
  40  * Private interface for iterating over pools specified on the command line.
  41  * Most consumers will call for_each_pool, but in order to support iostat, we
  42  * allow fined grained control through the zpool_list_t interface.
  43  */
  44
  45 typedef struct zpool_node {
  46         zpool_handle_t  *zn_handle;
  47         uu_avl_node_t   zn_avlnode;
  48         int             zn_mark;
  49 } zpool_node_t;
  50
  51 struct zpool_list {
  52         boolean_t       zl_findall;
  53         uu_avl_t        *zl_avl;
  54         uu_avl_pool_t   *zl_pool;
  55         zprop_list_t    **zl_proplist;
  56 };
  57
  58 /* ARGSUSED */
  59 static int
  60 zpool_compare(const void *larg, const void *rarg, void *unused)
  61 {
  62         zpool_handle_t *l = ((zpool_node_t *)larg)->zn_handle;
  63         zpool_handle_t *r = ((zpool_node_t *)rarg)->zn_handle;
  64         const char *lname = zpool_get_name(l);
  65         const char *rname = zpool_get_name(r);
  66
  67         return (strcmp(lname, rname));
  68 }
  69
  70 /*
  71  * Callback function for pool_list_get().  Adds the given pool to the AVL tree
  72  * of known pools.
  73  */
  74 static int
  75 add_pool(zpool_handle_t *zhp, void *data)
  76 {
  77         zpool_list_t *zlp = data;
  78         zpool_node_t *node = safe_malloc(sizeof (zpool_node_t));
  79         uu_avl_index_t idx;
  80
  81         node->zn_handle = zhp;
  82         uu_avl_node_init(node, &node->zn_avlnode, zlp->zl_pool);
  83         if (uu_avl_find(zlp->zl_avl, node, NULL, &idx) == NULL) {
  84                 if (zlp->zl_proplist &&
  85                     zpool_expand_proplist(zhp, zlp->zl_proplist) != 0) {
  86                         zpool_close(zhp);
  87                         free(node);
  88                         return (-1);
  89                 }
  90                 uu_avl_insert(zlp->zl_avl, node, idx);
  91         } else {
  92                 zpool_close(zhp);
  93                 free(node);
  94                 return (-1);
  95         }
  96
  97         return (0);
  98 }
  99
 100 /*
 101  * Create a list of pools based on the given arguments.  If we're given no
 102  * arguments, then iterate over all pools in the system and add them to the AVL
 103  * tree.  Otherwise, add only those pool explicitly specified on the command
 104  * line.
 105  */
 106 zpool_list_t *
 107 pool_list_get(int argc, char **argv, zprop_list_t **proplist, int *err)
 108 {
 109         zpool_list_t *zlp;
 110
 111         zlp = safe_malloc(sizeof (zpool_list_t));
 112
 113         zlp->zl_pool = uu_avl_pool_create("zfs_pool", sizeof (zpool_node_t),
 114             offsetof(zpool_node_t, zn_avlnode), zpool_compare, UU_DEFAULT);
 115
 116         if (zlp->zl_pool == NULL)
 117                 zpool_no_memory();
 118
 119         if ((zlp->zl_avl = uu_avl_create(zlp->zl_pool, NULL,
 120             UU_DEFAULT)) == NULL)
 121                 zpool_no_memory();
 122
 123         zlp->zl_proplist = proplist;
 124
 125         if (argc == 0) {
 126                 (void) zpool_iter(g_zfs, add_pool, zlp);
 127                 zlp->zl_findall = B_TRUE;
 128         } else {
 129                 int i;
 130
 131                 for (i = 0; i < argc; i++) {
 132                         zpool_handle_t *zhp;
 133
 134                         if (zhp = zpool_open_canfail(g_zfs, argv[i])) {
 135                                 if (add_pool(zhp, zlp) != 0)
 136                                         *err = B_TRUE;
 137                         } else {
 138                                 *err = B_TRUE;
 139                         }
 140                 }
 141         }
 142
 143         return (zlp);
 144 }
 145
 146 /*
 147  * Search for any new pools, adding them to the list.  We only add pools when no
 148  * options were given on the command line.  Otherwise, we keep the list fixed as
 149  * those that were explicitly specified.
 150  */
 151 void
 152 pool_list_update(zpool_list_t *zlp)
 153 {
 154         if (zlp->zl_findall)
 155                 (void) zpool_iter(g_zfs, add_pool, zlp);
 156 }
 157
 158 /*
 159  * Iterate over all pools in the list, executing the callback for each
 160  */
 161 int
 162 pool_list_iter(zpool_list_t *zlp, int unavail, zpool_iter_f func,
 163     void *data)
 164 {
 165         zpool_node_t *node, *next_node;
 166         int ret = 0;
 167
 168         for (node = uu_avl_first(zlp->zl_avl); node != NULL; node = next_node) {
 169                 next_node = uu_avl_next(zlp->zl_avl, node);
 170                 if (zpool_get_state(node->zn_handle) != POOL_STATE_UNAVAIL ||
 171                     unavail)
 172                         ret |= func(node->zn_handle, data);
 173         }
 174
 175         return (ret);
 176 }
 177
 178 /*
 179  * Remove the given pool from the list.  When running iostat, we want to remove
 180  * those pools that no longer exist.
 181  */
 182 void
 183 pool_list_remove(zpool_list_t *zlp, zpool_handle_t *zhp)
 184 {
 185         zpool_node_t search, *node;
 186
 187         search.zn_handle = zhp;
 188         if ((node = uu_avl_find(zlp->zl_avl, &search, NULL, NULL)) != NULL) {
 189                 uu_avl_remove(zlp->zl_avl, node);
 190                 zpool_close(node->zn_handle);
 191                 free(node);
 192         }
 193 }
 194
 195 /*
 196  * Free all the handles associated with this list.
 197  */
 198 void
 199 pool_list_free(zpool_list_t *zlp)
 200 {
 201         uu_avl_walk_t *walk;
 202         zpool_node_t *node;
 203
 204         if ((walk = uu_avl_walk_start(zlp->zl_avl, UU_WALK_ROBUST)) == NULL) {
 205                 (void) fprintf(stderr,
 206                     gettext("internal error: out of memory"));
 207                 exit(1);
 208         }
 209
 210         while ((node = uu_avl_walk_next(walk)) != NULL) {
 211                 uu_avl_remove(zlp->zl_avl, node);
 212                 zpool_close(node->zn_handle);
 213                 free(node);
 214         }
 215
 216         uu_avl_walk_end(walk);
 217         uu_avl_destroy(zlp->zl_avl);
 218         uu_avl_pool_destroy(zlp->zl_pool);
 219
 220         free(zlp);
 221 }
 222
 223 /*
 224  * Returns the number of elements in the pool list.
 225  */
 226 int
 227 pool_list_count(zpool_list_t *zlp)
 228 {
 229         return (uu_avl_numnodes(zlp->zl_avl));
 230 }
 231
 232 /*
 233  * High level function which iterates over all pools given on the command line,
 234  * using the pool_list_* interfaces.
 235  */
 236 int
 237 for_each_pool(int argc, char **argv, boolean_t unavail,
 238     zprop_list_t **proplist, zpool_iter_f func, void *data)
 239 {
 240         zpool_list_t *list;
 241         int ret = 0;
 242
 243         if ((list = pool_list_get(argc, argv, proplist, &ret)) == NULL)
 244                 return (1);
 245
 246         if (pool_list_iter(list, unavail, func, data) != 0)
 247                 ret = 1;
 248
 249         pool_list_free(list);
 250
 251         return (ret);
 252 }