vdev_missing.c

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    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 https://opensource.org/licenses/CDDL-1.0.
   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 2010 Sun Microsystems, Inc.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 /*
   27  * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
   28  */
   29 
   30 /*
   31  * The 'missing' vdev is a special vdev type used only during import.  It
   32  * signifies a placeholder in the root vdev for some vdev that we know is
   33  * missing.  We pass it down to the kernel to allow the rest of the
   34  * configuration to parsed and an attempt made to open all available devices.
   35  * Because its GUID is always 0, we know that the guid sum will mismatch and we
   36  * won't be able to open the pool anyway.
   37  */
   38 
   39 #include <sys/zfs_context.h>
   40 #include <sys/spa.h>
   41 #include <sys/vdev_impl.h>
   42 #include <sys/fs/zfs.h>
   43 #include <sys/zio.h>
   44 
   45 static int
   46 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
   47     uint64_t *ashift, uint64_t *pshift)
   48 {
   49         /*
   50          * Really this should just fail.  But then the root vdev will be in the
   51          * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is
   52          * VDEV_AUX_BAD_GUID_SUM.  So we pretend to succeed, knowing that we
   53          * will fail the GUID sum check before ever trying to open the pool.
   54          */
   55         (void) vd;
   56         *psize = 0;
   57         *max_psize = 0;
   58         *ashift = 0;
   59         *pshift = 0;
   60         return (0);
   61 }
   62 
   63 static void
   64 vdev_missing_close(vdev_t *vd)
   65 {
   66         (void) vd;
   67 }
   68 
   69 static void
   70 vdev_missing_io_start(zio_t *zio)
   71 {
   72         zio->io_error = SET_ERROR(ENOTSUP);
   73         zio_execute(zio);
   74 }
   75 
   76 static void
   77 vdev_missing_io_done(zio_t *zio)
   78 {
   79         (void) zio;
   80 }
   81 
   82 vdev_ops_t vdev_missing_ops = {
   83         .vdev_op_init = NULL,
   84         .vdev_op_fini = NULL,
   85         .vdev_op_open = vdev_missing_open,
   86         .vdev_op_close = vdev_missing_close,
   87         .vdev_op_asize = vdev_default_asize,
   88         .vdev_op_min_asize = vdev_default_min_asize,
   89         .vdev_op_min_alloc = NULL,
   90         .vdev_op_io_start = vdev_missing_io_start,
   91         .vdev_op_io_done = vdev_missing_io_done,
   92         .vdev_op_state_change = NULL,
   93         .vdev_op_need_resilver = NULL,
   94         .vdev_op_hold = NULL,
   95         .vdev_op_rele = NULL,
   96         .vdev_op_remap = NULL,
   97         .vdev_op_xlate = NULL,
   98         .vdev_op_rebuild_asize = NULL,
   99         .vdev_op_metaslab_init = NULL,
  100         .vdev_op_config_generate = NULL,
  101         .vdev_op_nparity = NULL,
  102         .vdev_op_ndisks = NULL,
  103         .vdev_op_type = VDEV_TYPE_MISSING,      /* name of this vdev type */
  104         .vdev_op_leaf = B_TRUE                  /* leaf vdev */
  105 };
  106 
  107 vdev_ops_t vdev_hole_ops = {
  108         .vdev_op_init = NULL,
  109         .vdev_op_fini = NULL,
  110         .vdev_op_open = vdev_missing_open,
  111         .vdev_op_close = vdev_missing_close,
  112         .vdev_op_asize = vdev_default_asize,
  113         .vdev_op_min_asize = vdev_default_min_asize,
  114         .vdev_op_min_alloc = NULL,
  115         .vdev_op_io_start = vdev_missing_io_start,
  116         .vdev_op_io_done = vdev_missing_io_done,
  117         .vdev_op_state_change = NULL,
  118         .vdev_op_need_resilver = NULL,
  119         .vdev_op_hold = NULL,
  120         .vdev_op_rele = NULL,
  121         .vdev_op_remap = NULL,
  122         .vdev_op_xlate = NULL,
  123         .vdev_op_rebuild_asize = NULL,
  124         .vdev_op_metaslab_init = NULL,
  125         .vdev_op_config_generate = NULL,
  126         .vdev_op_nparity = NULL,
  127         .vdev_op_ndisks = NULL,
  128         .vdev_op_type = VDEV_TYPE_HOLE,         /* name of this vdev type */
  129         .vdev_op_leaf = B_TRUE                  /* leaf vdev */
  130 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/zfs/vdev_missing.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/zfs/vdev_missing.c