libdisk/md.c

   1 /*
   2  * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 #include "drivers.h"
  34 #include "md.h"
  35
  36 int
  37 mnt_is_md_subvol(dev_t dev)
  38 {
  39         if (major(dev) == MD_MAJOR)
  40                 return 1;
  41         if (major(dev) == get_driver_block_major("md"))
  42                 return 1;
  43         return 0;
  44 }
  45
  46 int
  47 md_get_subvol_stripe(
  48         char            *dfile,
  49         sv_type_t       type,
  50         int             *sunit,
  51         int             *swidth,
  52         struct stat64   *sb)
  53 {
  54         if (mnt_is_md_subvol(sb->st_rdev)) {
  55                 struct md_array_info    md;
  56                 int                     fd;
  57
  58                 /* Open device */
  59                 fd = open(dfile, O_RDONLY);
  60                 if (fd == -1)
  61                         return 0;
  62
  63                 /* Is this thing on... */
  64                 if (ioctl(fd, GET_ARRAY_INFO, &md)) {
  65                         fprintf(stderr,
  66                                 _("Error getting MD array info from %s\n"),
  67                                 dfile);
  68                         exit(1);
  69                 }
  70                 close(fd);
  71
  72                 /* Check state */
  73                 if (!(md.state & (1 << MD_SB_CLEAN))) {
  74                         fprintf(stderr,
  75                                 _("warning - MD array %s not in clean state\n"),
  76                                 dfile);
  77                 }
  78                 if (md.state & (1 << MD_SB_ERRORS)) {
  79                         fprintf(stderr,
  80                                 _("warning - MD array %s in error state\n"),
  81                                 dfile);
  82                         exit(1);
  83                 }
  84
  85                 /* Deduct a disk from stripe width on RAID4/5 */
  86                 if (md.level == 4 || md.level == 5)
  87                         md.nr_disks--;
  88
  89                 /* Update sizes */
  90                 *sunit = md.chunk_size >> 9;
  91                 *swidth = *sunit * md.nr_disks;
  92
  93                 return 1;
  94         }
  95         return 0;
  96 }