include/xfs_multidisk.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2001,2004-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_MULTIDISK_H__
   7 #define __XFS_MULTIDISK_H__
   8
   9 #define XFS_DFL_SB_VERSION_BITS \
  10                 (XFS_SB_VERSION_NLINKBIT | \
  11                  XFS_SB_VERSION_EXTFLGBIT | \
  12                  XFS_SB_VERSION_DIRV2BIT)
  13
  14 #define XFS_DFL_BLOCKSIZE_LOG   12              /* 4096 byte blocks */
  15 #define XFS_DINODE_DFL_LOG      8               /* 256 byte inodes */
  16 #define XFS_DINODE_DFL_CRC_LOG  9               /* 512 byte inodes for CRCs */
  17 #define XFS_MIN_INODE_PERBLOCK  2               /* min inodes per block */
  18 #define XFS_DFL_IMAXIMUM_PCT    25              /* max % of space for inodes */
  19 #define XFS_MIN_REC_DIRSIZE     12              /* 4096 byte dirblocks (V2) */
  20 #define XFS_MAX_INODE_SIG_BITS  32              /* most significant bits in an
  21                                                  * inode number that we'll
  22                                                  * accept w/o warnings
  23                                                  */
  24
  25 #define XFS_AG_BYTES(bblog)             ((long long)BBSIZE << (bblog))
  26 #define XFS_MIN_DATA_BLOCKS(cfg)        (XFS_AG_MIN_BLOCKS((cfg)->blocklog))
  27 #define XFS_AG_MIN_BYTES                ((XFS_AG_BYTES(15)))    /* 16 MB */
  28 #define XFS_AG_MAX_BYTES                ((XFS_AG_BYTES(31)))    /* 1 TB */
  29 #define XFS_AG_MIN_BLOCKS(blog)         (XFS_AG_MIN_BYTES >> (blog))
  30 #define XFS_AG_MAX_BLOCKS(blog)         ((XFS_AG_MAX_BYTES - 1) >> (blog))
  31
  32 #define XFS_MAX_AGNUMBER                ((xfs_agnumber_t)(NULLAGNUMBER - 1))
  33
  34 /*
  35  * These values define what we consider a "multi-disk" filesystem. That is, a
  36  * filesystem that is likely to be made up of multiple devices, and hence have
  37  * some level of parallelism available to it at the IO level.
  38  */
  39 #define XFS_MULTIDISK_AGLOG             5       /* 32 AGs */
  40 #define XFS_NOMULTIDISK_AGLOG           2       /* 4 AGs */
  41 #define XFS_MULTIDISK_AGCOUNT           (1 << XFS_MULTIDISK_AGLOG)
  42
  43 #endif  /* __XFS_MULTIDISK_H__ */