usr/src/cmd/mdb/common/modules/md/walk_directory_block.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "mdinclude.h"
  30
  31 /*
  32  * Generic walker svm mddb directory block walker.
  33  */
  34 int
  35 mddb_db_walk_init(mdb_walk_state_t *wsp)
  36 {
  37
  38         /* Must have a start addr.  */
  39         if (wsp->walk_addr == NULL) {
  40                 mdb_warn("start address required\n");
  41                 return (WALK_ERR);
  42         }
  43         return (WALK_NEXT);
  44 }
  45
  46
  47 /*
  48  * svm mddb directory block walker step routine.
  49  */
  50 int
  51 mddb_db_walk_step(mdb_walk_state_t *wsp)
  52 {
  53         mddb_db_t       db_entry;
  54         int             status;
  55
  56         if (wsp->walk_addr == NULL)
  57                 return (WALK_DONE);
  58
  59         if (mdb_vread(&db_entry, sizeof (mddb_db_t), wsp->walk_addr) == -1) {
  60                 mdb_warn("failed to read mddb_db_t at %p",
  61                 wsp->walk_addr);
  62                 return (WALK_ERR);
  63         }
  64
  65         status = wsp->walk_callback(wsp->walk_addr, (&db_entry)->db_next,
  66             wsp->walk_cbdata);
  67
  68         wsp->walk_addr = (uintptr_t)db_entry.db_next;
  69
  70         return (status);
  71 }