include/xfs_multidisk.h

   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 #ifndef __XFS_MULTIDISK_H__
  19 #define __XFS_MULTIDISK_H__
  20
  21 #define XFS_DFL_SB_VERSION_BITS \
  22                 (XFS_SB_VERSION_NLINKBIT | \
  23                  XFS_SB_VERSION_EXTFLGBIT | \
  24                  XFS_SB_VERSION_DIRV2BIT)
  25
  26 #define XFS_DFL_BLOCKSIZE_LOG   12              /* 4096 byte blocks */
  27 #define XFS_DINODE_DFL_LOG      8               /* 256 byte inodes */
  28 #define XFS_DINODE_DFL_CRC_LOG  9               /* 512 byte inodes for CRCs */
  29 #define XFS_MIN_DATA_BLOCKS     100
  30 #define XFS_MIN_INODE_PERBLOCK  2               /* min inodes per block */
  31 #define XFS_DFL_IMAXIMUM_PCT    25              /* max % of space for inodes */
  32 #define XFS_IFLAG_ALIGN         true            /* -i align defaults on */
  33 #define XFS_MIN_REC_DIRSIZE     12              /* 4096 byte dirblocks (V2) */
  34 #define XFS_DFL_DIR_VERSION     2               /* default directory version */
  35 #define XFS_DFL_LOG_SIZE        1000            /* default log size, blocks */
  36 #define XFS_DFL_LOG_FACTOR      5               /* default log size, factor */
  37                                                 /* with max trans reservation */
  38 #define XFS_MAX_INODE_SIG_BITS  32              /* most significant bits in an
  39                                                  * inode number that we'll
  40                                                  * accept w/o warnings
  41                                                  */
  42
  43 #define XFS_AG_BYTES(bblog)     ((long long)BBSIZE << (bblog))
  44 #define XFS_AG_MIN_BYTES        ((XFS_AG_BYTES(15)))    /* 16 MB */
  45 #define XFS_AG_MAX_BYTES        ((XFS_AG_BYTES(31)))    /* 1 TB */
  46 #define XFS_AG_MIN_BLOCKS(blog) (XFS_AG_MIN_BYTES >> (blog))
  47 #define XFS_AG_MAX_BLOCKS(blog) ((XFS_AG_MAX_BYTES - 1) >> (blog))
  48
  49 #define XFS_MAX_AGNUMBER        ((xfs_agnumber_t)(NULLAGNUMBER - 1))
  50
  51 /*
  52  * These values define what we consider a "multi-disk" filesystem. That is, a
  53  * filesystem that is likely to be made up of multiple devices, and hence have
  54  * some level of parallelism available to it at the IO level.
  55  */
  56 #define XFS_MULTIDISK_AGLOG             5       /* 32 AGs */
  57 #define XFS_NOMULTIDISK_AGLOG           2       /* 4 AGs */
  58 #define XFS_MULTIDISK_AGCOUNT           (1 << XFS_MULTIDISK_AGLOG)
  59
  60 extern long long cvtnum(unsigned int blksize, unsigned int sectsize,
  61                         const char *str);
  62
  63 /* proto.c */
  64 extern char *setup_proto (char *fname);
  65 extern void parse_proto (xfs_mount_t *mp, struct fsxattr *fsx, char **pp);
  66 extern void res_failed (int err);
  67
  68 /* maxtrres.c */
  69 extern int max_trans_res(unsigned long agsize, int crcs_enabled, int dirversion,
  70                 int sectorlog, int blocklog, int inodelog, int dirblocklog,
  71                 int logversion, int log_sunit, int finobt, int rmapbt);
  72
  73 #endif  /* __XFS_MULTIDISK_H__ */