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/driver.h>
  16 #include <unistd.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <errno.h>
  20 #include <string.h>
  21
  22 #define SECTOR_SIZE     512
  23
  24 typedef enum {
  25   ST_NIL,               /* Zero checksums */
  26   ST_XOR,               /* XOR-based checksums */
  27   ST_CRC,               /* CRC32-based checksums */
  28   ST_MD5                /* MD5-based checksums */
  29 } checksum_type;
  30
  31 typedef enum {
  32   FLT_WRITE,            /* write to up to two disks */
  33   FLT_READ,             /* read from one disk */
  34   FLT_READ2             /* read from both disks */
  35 } disk_operation;
  36
  37 struct driverinfo {
  38   char *label;
  39   int minor;
  40   endpoint_t endpt;
  41   int up_event;
  42
  43   int problem;          /* one of BD_* */
  44   int error;            /* one of E*, only relevant if problem>0 */
  45   int retries;
  46   int kills;
  47 };
  48
  49 /* UP event characterization. */
  50 #define UP_EXPECTED     0
  51 #define UP_NONE         1
  52 #define UP_PENDING      2
  53
  54 /* Something was wrong and the disk driver has been restarted/refreshed,
  55  * so the request needs to be redone.
  56  */
  57 #define RET_REDO        1
  58
  59 /* The cases where the disk driver need to be restarted/refreshed by RS.
  60  * BD_DEAD: the disk driver has died. Restart it.
  61  * BD_PROTO: a protocol error has occurred. Refresh it.
  62  * BD_DATA: a data error has occurred. Refresh it.
  63  */
  64 typedef enum {
  65   BD_NONE,
  66   BD_DEAD,
  67   BD_PROTO,
  68   BD_DATA,
  69   BD_LAST
  70 } driver_state;
  71
  72 #define DRIVER_MAIN     0
  73 #define DRIVER_BACKUP   1
  74
  75 /* Requests for more than this many bytes will be allocated dynamically. */
  76 #define BUF_SIZE        (256 * 1024)
  77 #define SBUF_SIZE       (BUF_SIZE * 2)
  78
  79 #define LABEL_SIZE      32
  80
  81 typedef unsigned long   sector_t;
  82
  83 /* main.c */
  84 extern int USE_CHECKSUM;
  85 extern int USE_MIRROR;
  86 extern int BAD_SUM_ERROR;
  87 extern int USE_SUM_LAYOUT;
  88 extern int SUM_TYPE;
  89 extern int SUM_SIZE;
  90 extern int NR_SUM_SEC;
  91 extern int NR_RETRIES;
  92 extern int NR_RESTARTS;
  93 extern int DRIVER_TIMEOUT;
  94 extern int CHUNK_SIZE;
  95
  96 extern char MAIN_LABEL[LABEL_SIZE];
  97 extern char BACKUP_LABEL[LABEL_SIZE];
  98 extern int MAIN_MINOR;
  99 extern int BACKUP_MINOR;
 100
 101 /* sum.c */
 102 extern void sum_init(void);
 103 extern int transfer(u64_t pos, char *buffer, size_t *sizep, int flag_rw);
 104 extern u64_t convert(u64_t size);
 105
 106 /* driver.c */
 107 extern void driver_init(void);
 108 extern void driver_shutdown(void);
 109 extern u64_t get_raw_size(void);
 110 extern void reset_kills(void);
 111 extern int check_driver(int which);
 112 extern int bad_driver(int which, int type, int error);
 113 extern int read_write(u64_t pos, char *bufa, char *bufb, size_t *sizep,
 114         int flag_rw);
 115 extern void ds_event(void);
 116
 117 /* util.c */
 118 extern char *flt_malloc(size_t size, char *sbuf, size_t ssize);
 119 extern void flt_free(char *buf, size_t size, const char *sbuf);
 120 extern char *print64(u64_t p);
 121 extern clock_t flt_alarm(clock_t dt);
 122