rom/filesys/SFS/FS/adminspaces.h

   1 #ifndef _ADMINSPACES_H
   2 #define _ADMINSPACES_H
   3
   4 #include <exec/types.h>
   5 #include <libraries/iffparse.h>
   6 #include "blockstructure.h"
   7
   8 struct fsAdminSpace {
   9   BLCK  be_space;
  10   ULONG be_bits;      /* Set bits are used blocks, bit 31 is
  11                       the first block in the AdminSpace. */
  12 };
  13
  14
  15 #define ADMINSPACECONTAINER_ID     AROS_LONG2BE(MAKE_ID('A','D','M','C'))
  16
  17 struct fsAdminSpaceContainer {
  18   struct fsBlockHeader bheader;
  19
  20   BLCK be_next;
  21   BLCK be_previous;
  22
  23   UBYTE bits;    /* Bits 0-2: %000 = 2^0 = bitmap size 1 byte.
  24                               %001 = 2^1 = bitmap size 2 bytes.
  25                               %010 = 2^2 = bitmap size 4 bytes.
  26                               %011 = 2^3 = bitmap size 8 bytes.
  27                               %100 = 2^4 = bitmap size 16 bytes.
  28                               %101 = 2^5 = bitmap size 32 bytes.
  29                               %110 = 2^6 = bitmap size 64 bytes.
  30                               %111 = 2^7 = bitmap size 128 bytes. */
  31   UBYTE be_pad1;
  32   UWORD be_pad2;
  33
  34   struct fsAdminSpace adminspace[0];
  35 };
  36
  37
  38
  39 /*
  40
  41   INT((blocksize-sizeof(struct fsAdminSpaceContainer)) / (2^bits+4)) * 2^bits
  42
  43   Effectiveness     512  1024  2048  4096  8192
  44   -----------------------------------------------
  45      4              244   500
  46      8              320   664
  47     16              384   800
  48     32              468   864
  49     64              476   896  1856  3776  7680
  50    128              396   896  1920  3840  7808
  51   -----------------------------------------------
  52 */
  53
  54 /*
  55   30.000 files -> 3000-6000 OBJC -> 6000-12000 blocks.
  56
  57   1952 blocks/ADMC
  58
  59
  60
  61 */
  62
  63 #endif // _ADMINSPACES_H