drivers/s390/block/dasd_fba.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * Copyright IBM Corp. 1999, 2000
   6  *
   7  */
   8
   9 #ifndef DASD_FBA_H
  10 #define DASD_FBA_H
  11
  12 /*
  13  * Maximum number of blocks to be chained
  14  */
  15 #define DASD_FBA_MAX_BLOCKS             96
  16
  17 struct DE_fba_data {
  18         struct {
  19                 unsigned char perm:2;   /* Permissions on this extent */
  20                 unsigned char zero:2;   /* Must be zero */
  21                 unsigned char da:1;     /* usually zero */
  22                 unsigned char diag:1;   /* allow diagnose */
  23                 unsigned char zero2:2;  /* zero */
  24         } __attribute__ ((packed)) mask;
  25         __u8 zero;              /* Must be zero */
  26         __u16 blk_size;         /* Blocksize */
  27         __u32 ext_loc;          /* Extent locator */
  28         __u32 ext_beg;          /* logical number of block 0 in extent */
  29         __u32 ext_end;          /* logocal number of last block in extent */
  30 } __attribute__ ((packed));
  31
  32 struct LO_fba_data {
  33         struct {
  34                 unsigned char zero:4;
  35                 unsigned char cmd:4;
  36         } __attribute__ ((packed)) operation;
  37         __u8 auxiliary;
  38         __u16 blk_ct;
  39         __u32 blk_nr;
  40 } __attribute__ ((packed));
  41
  42 struct dasd_fba_characteristics {
  43         union {
  44                 __u8 c;
  45                 struct {
  46                         unsigned char reserved:1;
  47                         unsigned char overrunnable:1;
  48                         unsigned char burst_byte:1;
  49                         unsigned char data_chain:1;
  50                         unsigned char zeros:4;
  51                 } __attribute__ ((packed)) bits;
  52         } __attribute__ ((packed)) mode;
  53         union {
  54                 __u8 c;
  55                 struct {
  56                         unsigned char zero0:1;
  57                         unsigned char removable:1;
  58                         unsigned char shared:1;
  59                         unsigned char zero1:1;
  60                         unsigned char mam:1;
  61                         unsigned char zeros:3;
  62                 } __attribute__ ((packed)) bits;
  63         } __attribute__ ((packed)) features;
  64         __u8 dev_class;
  65         __u8 unit_type;
  66         __u16 blk_size;
  67         __u32 blk_per_cycl;
  68         __u32 blk_per_bound;
  69         __u32 blk_bdsa;
  70         __u32 reserved0;
  71         __u16 reserved1;
  72         __u16 blk_ce;
  73         __u32 reserved2;
  74         __u16 reserved3;
  75 } __attribute__ ((packed));
  76
  77 #endif                          /* DASD_FBA_H */