122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/* Filter driver - general include file */
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#define _SYSTEM 1
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <minix/com.h>
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#include <minix/ipc.h>
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#include <sys/ioc_disk.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/partition.h>
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#include <minix/ds.h>
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#include <minix/callnr.h>
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#include <minix/blockdriver.h>
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#include <minix/optset.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#define SECTOR_SIZE 512
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typedef enum {
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ST_NIL, /* Zero checksums */
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ST_XOR, /* XOR-based checksums */
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ST_CRC, /* CRC32-based checksums */
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ST_MD5 /* MD5-based checksums */
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} checksum_type;
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typedef enum {
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FLT_WRITE, /* write to up to two disks */
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FLT_READ, /* read from one disk */
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FLT_READ2 /* read from both disks */
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} disk_operation;
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struct driverinfo {
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char *label;
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int minor;
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endpoint_t endpt;
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int up_event;
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int problem; /* one of BD_* */
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int error; /* one of E*, only relevant if problem>0 */
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int retries;
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int kills;
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};
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/* UP event characterization. */
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#define UP_EXPECTED 0
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#define UP_NONE 1
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#define UP_PENDING 2
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/* Something was wrong and the disk driver has been restarted/refreshed,
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* so the request needs to be redone.
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*/
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#define RET_REDO 1
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/* The cases where the disk driver need to be restarted/refreshed by RS.
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* BD_DEAD: the disk driver has died. Restart it.
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* BD_PROTO: a protocol error has occurred. Refresh it.
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* BD_DATA: a data error has occurred. Refresh it.
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*/
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typedef enum {
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BD_NONE,
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BD_DEAD,
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BD_PROTO,
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BD_DATA,
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BD_LAST
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} driver_state;
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#define DRIVER_MAIN 0
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#define DRIVER_BACKUP 1
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/* Requests for more than this many bytes will be allocated dynamically. */
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#define BUF_SIZE (256 * 1024)
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#define SBUF_SIZE (BUF_SIZE * 2)
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#define LABEL_SIZE 32
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typedef unsigned long sector_t;
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/* main.c */
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extern int USE_CHECKSUM;
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extern int USE_MIRROR;
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extern int BAD_SUM_ERROR;
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extern int USE_SUM_LAYOUT;
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extern int SUM_TYPE;
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extern int SUM_SIZE;
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extern int NR_SUM_SEC;
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extern int NR_RETRIES;
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extern int NR_RESTARTS;
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extern int DRIVER_TIMEOUT;
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extern int CHUNK_SIZE;
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extern char MAIN_LABEL[LABEL_SIZE];
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extern char BACKUP_LABEL[LABEL_SIZE];
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extern int MAIN_MINOR;
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extern int BACKUP_MINOR;
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/* sum.c */
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extern void sum_init(void);
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extern int transfer(u64_t pos, char *buffer, size_t *sizep, int flag_rw);
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extern u64_t convert(u64_t size);
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/* driver.c */
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extern void driver_init(void);
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extern void driver_shutdown(void);
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extern u64_t get_raw_size(void);
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extern void reset_kills(void);
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extern int check_driver(int which);
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extern int bad_driver(int which, int type, int error);
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extern int read_write(u64_t pos, char *bufa, char *bufb, size_t *sizep,
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int flag_rw);
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extern void ds_event(void);
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/* util.c */
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extern char *flt_malloc(size_t size, char *sbuf, size_t ssize);
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extern void flt_free(char *buf, size_t size, const char *sbuf);
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extern clock_t flt_alarm(clock_t dt);
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