cddl/usr.sbin/zfsd/vdev_iterator.cc

   1 /*-
   2  * Copyright (c) 2011, 2012, 2013 Spectra Logic Corporation
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions, and the following disclaimer,
  10  *    without modification.
  11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  12  *    substantially similar to the "NO WARRANTY" disclaimer below
  13  *    ("Disclaimer") and any redistribution must be conditioned upon
  14  *    including a substantially similar Disclaimer requirement for further
  15  *    binary redistribution.
  16  *
  17  * NO WARRANTY
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGES.
  29  *
  30  * Authors: Justin T. Gibbs     (Spectra Logic Corporation)
  31  *
  32  * $FreeBSD$
  33  */
  34
  35 /**
  36  * \file vdev_iterator.cc
  37  *
  38  * Implementation of the VdevIterator class.
  39  */
  40 #include <sys/cdefs.h>
  41 #include <sys/fs/zfs.h>
  42
  43 #include <stdint.h>
  44 #include <syslog.h>
  45
  46 #include <libzfs.h>
  47
  48 #include <list>
  49 #include <string>
  50
  51 #include <devdctl/exception.h>
  52 #include <devdctl/guid.h>
  53
  54 #include "vdev.h"
  55 #include "vdev_iterator.h"
  56 #include "zfsd_exception.h"
  57
  58 /*============================ Namespace Control =============================*/
  59 using DevdCtl::Guid;
  60
  61 /*=========================== Class Implementations ==========================*/
  62 /*------------------------------- VdevIterator -------------------------------*/
  63 VdevIterator::VdevIterator(zpool_handle_t *pool)
  64  : m_poolConfig(zpool_get_config(pool, NULL))
  65 {
  66         Reset();
  67 }
  68
  69 VdevIterator::VdevIterator(nvlist_t *poolConfig)
  70  : m_poolConfig(poolConfig)
  71 {
  72         Reset();
  73 }
  74
  75 void
  76 VdevIterator::Reset()
  77 {
  78         nvlist_t  *rootVdev;
  79         nvlist    **cache_child;
  80         int        result;
  81         uint_t   cache_children;
  82
  83         result = nvlist_lookup_nvlist(m_poolConfig,
  84                                       ZPOOL_CONFIG_VDEV_TREE,
  85                                       &rootVdev);
  86         if (result != 0)
  87                 throw ZfsdException(m_poolConfig, "Unable to extract "
  88                                     "ZPOOL_CONFIG_VDEV_TREE from pool.");
  89         m_vdevQueue.assign(1, rootVdev);
  90         result = nvlist_lookup_nvlist_array(rootVdev,
  91                                             ZPOOL_CONFIG_L2CACHE,
  92                                             &cache_child,
  93                                             &cache_children);
  94         if (result == 0)
  95                 for (uint_t c = 0; c < cache_children; c++)
  96                         m_vdevQueue.push_back(cache_child[c]);
  97 }
  98
  99 nvlist_t *
 100 VdevIterator::Next()
 101 {
 102         nvlist_t *vdevConfig;
 103
 104         if (m_vdevQueue.empty())
 105                 return (NULL);
 106
 107         for (;;) {
 108                 nvlist_t **vdevChildren;
 109                 int        result;
 110                 u_int      numChildren;
 111
 112                 vdevConfig = m_vdevQueue.front();
 113                 m_vdevQueue.pop_front();
 114
 115                 /* Expand non-leaf vdevs. */
 116                 result = nvlist_lookup_nvlist_array(vdevConfig,
 117                                                     ZPOOL_CONFIG_CHILDREN,
 118                                                    &vdevChildren, &numChildren);
 119                 if (result != 0) {
 120                         /* leaf vdev */
 121                         break;
 122                 }
 123
 124                 /*
 125                  * Insert children at the head of the queue to effect a
 126                  * depth first traversal of the tree.
 127                  */
 128                 m_vdevQueue.insert(m_vdevQueue.begin(), vdevChildren,
 129                                    vdevChildren + numChildren);
 130         }
 131
 132         return (vdevConfig);
 133 }
 134
 135 void
 136 VdevIterator::Each(VdevCallback_t *callBack, void *callBackArg)
 137 {
 138         nvlist_t *vdevConfig;
 139
 140         Reset();
 141         while ((vdevConfig = Next()) != NULL) {
 142                 Vdev vdev(m_poolConfig, vdevConfig);
 143
 144                 if (callBack(vdev, callBackArg))
 145                         break;
 146         }
 147 }
 148
 149 nvlist_t *
 150 VdevIterator::Find(Guid vdevGUID)
 151 {
 152         nvlist_t *vdevConfig;
 153
 154         Reset();
 155         while ((vdevConfig = Next()) != NULL) {
 156                 Vdev vdev(m_poolConfig, vdevConfig);
 157
 158                 if (vdev.GUID() == vdevGUID)
 159                         return (vdevConfig);
 160         }
 161         return (NULL);
 162 }