drivers/filter/inc.h

   1 /* Filter driver - general include file */
   2 #define _MINIX 1
   3 #define _SYSTEM 1
   4 #include <minix/config.h>
   5 #include <minix/const.h>
   6 #include <minix/type.h>
   7 #include <minix/com.h>
   8 #include <minix/ipc.h>
   9 #include <sys/ioc_disk.h>
  10 #include <minix/sysutil.h>
  11 #include <minix/syslib.h>
  12 #include <minix/partition.h>
  13 #include <minix/ds.h>
  14 #include <minix/callnr.h>
  15 #include <minix/blockdriver.h>
  16 #include <minix/optset.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <errno.h>
  21 #include <string.h>
  22
  23 #define SECTOR_SIZE     512
  24
  25 typedef enum {
  26   ST_NIL,               /* Zero checksums */
  27   ST_XOR,               /* XOR-based checksums */
  28   ST_CRC,               /* CRC32-based checksums */
  29   ST_MD5                /* MD5-based checksums */
  30 } checksum_type;
  31
  32 typedef enum {
  33   FLT_WRITE,            /* write to up to two disks */
  34   FLT_READ,             /* read from one disk */
  35   FLT_READ2             /* read from both disks */
  36 } disk_operation;
  37
  38 struct driverinfo {
  39   char *label;
  40   int minor;
  41   endpoint_t endpt;
  42   int up_event;
  43
  44   int problem;          /* one of BD_* */
  45   int error;            /* one of E*, only relevant if problem>0 */
  46   int retries;
  47   int kills;
  48 };
  49
  50 /* UP event characterization. */
  51 #define UP_EXPECTED     0
  52 #define UP_NONE         1
  53 #define UP_PENDING      2
  54
  55 /* Something was wrong and the disk driver has been restarted/refreshed,
  56  * so the request needs to be redone.
  57  */
  58 #define RET_REDO        1
  59
  60 /* The cases where the disk driver need to be restarted/refreshed by RS.
  61  * BD_DEAD: the disk driver has died. Restart it.
  62  * BD_PROTO: a protocol error has occurred. Refresh it.
  63  * BD_DATA: a data error has occurred. Refresh it.
  64  */
  65 typedef enum {
  66   BD_NONE,
  67   BD_DEAD,
  68   BD_PROTO,
  69   BD_DATA,
  70   BD_LAST
  71 } driver_state;
  72
  73 #define DRIVER_MAIN     0
  74 #define DRIVER_BACKUP   1
  75
  76 /* Requests for more than this many bytes will be allocated dynamically. */
  77 #define BUF_SIZE        (256 * 1024)
  78 #define SBUF_SIZE       (BUF_SIZE * 2)
  79
  80 #define LABEL_SIZE      32
  81
  82 typedef unsigned long   sector_t;
  83
  84 /* main.c */
  85 extern int USE_CHECKSUM;
  86 extern int USE_MIRROR;
  87 extern int BAD_SUM_ERROR;
  88 extern int USE_SUM_LAYOUT;
  89 extern int SUM_TYPE;
  90 extern int SUM_SIZE;
  91 extern int NR_SUM_SEC;
  92 extern int NR_RETRIES;
  93 extern int NR_RESTARTS;
  94 extern int DRIVER_TIMEOUT;
  95 extern int CHUNK_SIZE;
  96
  97 extern char MAIN_LABEL[LABEL_SIZE];
  98 extern char BACKUP_LABEL[LABEL_SIZE];
  99 extern int MAIN_MINOR;
 100 extern int BACKUP_MINOR;
 101
 102 /* sum.c */
 103 extern void sum_init(void);
 104 extern int transfer(u64_t pos, char *buffer, size_t *sizep, int flag_rw);
 105 extern u64_t convert(u64_t size);
 106
 107 /* driver.c */
 108 extern void driver_init(void);
 109 extern void driver_shutdown(void);
 110 extern u64_t get_raw_size(void);
 111 extern void reset_kills(void);
 112 extern int check_driver(int which);
 113 extern int bad_driver(int which, int type, int error);
 114 extern int read_write(u64_t pos, char *bufa, char *bufb, size_t *sizep,
 115         int flag_rw);
 116 extern void ds_event(void);
 117
 118 /* util.c */
 119 extern char *flt_malloc(size_t size, char *sbuf, size_t ssize);
 120 extern void flt_free(char *buf, size_t size, const char *sbuf);
 121 extern clock_t flt_alarm(clock_t dt);
 122