mkfs/maxtrres.c

   1 /*
   2  * Copyright (c) 2000-2001,2004-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 /*
  20  * maxtrres.c
  21  *
  22  * Compute the maximum transaction reservation for a legal combination
  23  * of sector size, block size, inode size, directory version, and
  24  * directory block size.
  25  */
  26
  27 #include "libxfs.h"
  28 #include "xfs_multidisk.h"
  29
  30 int
  31 max_trans_res(
  32         unsigned long   agsize,
  33         int             crcs_enabled,
  34         int             dirversion,
  35         int             sectorlog,
  36         int             blocklog,
  37         int             inodelog,
  38         int             dirblocklog,
  39         int             logversion,
  40         int             log_sunit,
  41         int             finobt,
  42         int             rmapbt)
  43 {
  44         xfs_sb_t        *sbp;
  45         xfs_mount_t     mount;
  46         int             maxfsb;
  47
  48         memset(&mount, 0, sizeof(mount));
  49         sbp = &mount.m_sb;
  50         sbp->sb_magicnum = XFS_SB_MAGIC;
  51         sbp->sb_sectlog = sectorlog;
  52         sbp->sb_sectsize = 1 << sbp->sb_sectlog;
  53         sbp->sb_blocklog = blocklog;
  54         sbp->sb_blocksize = 1 << blocklog;
  55         sbp->sb_agblocks = agsize;
  56         sbp->sb_inodelog = inodelog;
  57         sbp->sb_inopblog = blocklog - inodelog;
  58         sbp->sb_inodesize = 1 << inodelog;
  59         sbp->sb_inopblock = 1 << (blocklog - inodelog);
  60         sbp->sb_dirblklog = dirblocklog - blocklog;
  61
  62         if (log_sunit > 0) {
  63                 log_sunit <<= blocklog;
  64                 logversion = 2;
  65         } else
  66                 log_sunit = 1;
  67         sbp->sb_logsunit = log_sunit;
  68
  69         sbp->sb_versionnum =
  70                         (crcs_enabled ? XFS_SB_VERSION_5 : XFS_SB_VERSION_4) |
  71                         (dirversion == 2 ? XFS_SB_VERSION_DIRV2BIT : 0) |
  72                         (logversion > 1 ? XFS_SB_VERSION_LOGV2BIT : 0) |
  73                         XFS_DFL_SB_VERSION_BITS;
  74         if (finobt)
  75                 sbp->sb_features_ro_compat |= XFS_SB_FEAT_RO_COMPAT_FINOBT;
  76         if (rmapbt)
  77                 sbp->sb_features_ro_compat |= XFS_SB_FEAT_RO_COMPAT_RMAPBT;
  78
  79         libxfs_mount(&mount, sbp, 0,0,0,0);
  80         maxfsb = xfs_log_calc_minimum_size(&mount);
  81         libxfs_umount(&mount);
  82
  83 #if 0
  84         printf("#define\tMAXTRRES_S%d_B%d_I%d_D%d_V%d_LSU%d\t%d\n",
  85                 sectorlog, blocklog, inodelog, dirblocklog, dirversion,
  86                 log_sunit, maxfsb);
  87 #endif
  88
  89         return maxfsb;
  90 }