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tapeexerciser.c
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tapeexerciser.c
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/*
* Put a tape device thru a set of exercises
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mtio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
static int space_forward_filemark(int fd, int count)
{
struct mtop mtop;
int err;
printf("%s(%d)", __func__, count);
mtop.mt_op = MTFSF; /* Forward Space over count Filemarks */
mtop.mt_count = count;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int space_back_filemark(int fd, int count)
{
struct mtop mtop;
int err;
printf("%s(%d)", __func__, count);
mtop.mt_op = MTBSF; /* Back Space over count Filemarks */
mtop.mt_count = count;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int space_forward_block(int fd, int count)
{
struct mtop mtop;
int err;
printf("%s(%d)", __func__, count);
mtop.mt_op = MTFSR; /* Forward count block */
mtop.mt_count = count;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int write_filemarks(int fd, int count)
{
struct mtop mtop;
int err;
printf("%s(%d)", __func__, count);
mtop.mt_op = MTWEOF;
mtop.mt_count = count;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int space_back_block(int fd, int count)
{
struct mtop mtop;
int err;
printf("%s(%d)", __func__, count);
mtop.mt_op = MTBSR; /* Back count block */
mtop.mt_count = 1;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int set_compression(int fd, int state)
{
struct mtop mtop;
int err;
printf("%s()", __func__);
mtop.mt_op = MTCOMPRESSION; /* Set compression */
mtop.mt_count = state;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int rewind_tape(int fd)
{
struct mtop mtop;
int err;
printf("%s()", __func__);
mtop.mt_op = MTREW;
mtop.mt_count = 1;
err = ioctl(fd, MTIOCTOP, &mtop);
if (err)
printf(" %s", strerror(errno));
printf("\n");
return err;
}
static int read_block_position(int fd)
{
struct mtpos mtpos;
int err;
err = ioctl(fd, MTIOCPOS, &mtpos);
if (err) {
printf("%s: %s\n", __func__, strerror(errno));
return -1;
}
return mtpos.mt_blkno;
}
static int read_block(int fd, int size)
{
char *buf;
int err;
buf = malloc(size);
if (!buf)
return -ENOMEM;
printf("%s(%d)", __func__, size);
err = read(fd, buf, size);
if (err < 0)
printf(" %s", strerror(errno));
printf("\n");
free(buf);
return err;
}
static int write_block(int fd, int size)
{
char *buf;
int err;
buf = malloc(size);
if (!buf)
return -ENOMEM;
memset(buf, 0x45, size);
printf("%s(%d)", __func__, size);
err = write(fd, buf, size);
if (err < 0)
printf(" %s", strerror(errno));
printf("\n");
free(buf);
return err;
}
static void usage(char *arg)
{
printf("Usage: %s -f tape_path\n", arg);
printf(" WARNING: %s will overwrite the tape\n\n", arg);
}
void write_tape_pattern_1(int fd)
{
rewind_tape(fd);
write_block(fd, 8 * 1024);
write_block(fd, 64 * 1024);
write_filemarks(fd, 1);
write_block(fd, 64 * 1024);
write_block(fd, 64 * 1024);
write_block(fd, 64 * 1024);
write_block(fd, 64 * 1024);
write_block(fd, 64 * 1024);
write_filemarks(fd, 0); /* Flush data */
write_filemarks(fd, 1);
}
void write_tape_pattern_2(int fd)
{
rewind_tape(fd);
space_forward_filemark(fd, 1);
space_forward_block(fd, 5); /* should be at end filemark */
write_block(fd, 128 * 1024);
write_block(fd, 128 * 1024);
write_block(fd, 128 * 1024);
write_filemarks(fd, 1);
write_block(fd, 128 * 1024);
write_filemarks(fd, 1);
write_block(fd, 128 * 1024);
write_filemarks(fd, 2);
}
int read_test_1(int fd)
{
rewind_tape(fd);
read_block(fd, 8 * 1024);
printf("%s: Block %d\n", __func__, read_block_position(fd));
space_forward_filemark(fd, 3);
printf("%s: Block %d\n", __func__, read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__, read_block_position(fd));
space_back_block(fd, 1);
printf("%s: Block %d\n", __func__, read_block_position(fd));
read_block(fd, 32 * 1024);
printf("%s: Block %d\n", __func__, read_block_position(fd));
return 0;
}
int read_test_2(int fd)
{
rewind_tape(fd);
space_forward_filemark(fd, 3);
read_block(fd, 64 * 1024);
space_forward_block(fd, 1);
read_block(fd, 64 * 1024);
printf("%s: Did we error here ??\n", __func__);
rewind_tape(fd);
printf("%s: Block %d\n", __func__, read_block_position(fd));
printf("%s: Note: following space_forward_filemark(100000)"
" should error\n", __func__);
space_forward_filemark(fd, 100000);
printf("%s: Block %d\n", __func__, read_block_position(fd));
space_back_filemark(fd, 2);
printf("%s: Block %d\n", __func__, read_block_position(fd));
space_back_block(fd, 1);
printf("%s: Block %d\n", __func__, read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__, read_block_position(fd));
return 0;
}
int read_test_3(int fd)
{
rewind_tape(fd);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 8 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 3);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_back_block(fd, 1);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
printf("%s: Note: following space_forward_block() should error\n",
__func__);
space_forward_block(fd, 1);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
return 0;
}
int read_test_4(int fd)
{
rewind_tape(fd);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 1);
printf("*** Should be at block 3 ==> \t");
printf("%s: Block %d\n", __func__ , read_block_position(fd));
rewind_tape(fd);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 8 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 1);
printf("*** Should be at block 3 ==> \t");
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_back_block(fd, 1);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 64 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_block(fd, 1);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 1);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
return 0;
}
int read_test_5(int fd)
{
rewind_tape(fd);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 1);
printf("*** Should be at block 3 ==> \t");
printf("%s: Block %d\n", __func__ , read_block_position(fd));
rewind_tape(fd);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
read_block(fd, 8 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
space_forward_filemark(fd, 1);
printf("*** Should be at block 3 ==> \t");
printf("%s: Block %d\n", __func__ , read_block_position(fd));
printf("Only reading 32k of a 64k block\n");
read_block(fd, 32 * 1024);
printf("%s: Block %d\n", __func__ , read_block_position(fd));
return 0;
}
int main(int argc, char *argv[])
{
struct mtget mtstat;
struct mtpos mtpos;
char *dev = NULL;
int tape_fd;
int err;
int count;
if (argc != 3) {
usage(argv[0]);
exit(1);
}
/* checking several positions of -h/-help */
for (count = 1; count < argc; count++) {
if (!strcmp(argv[count], "-f")) {
if (argc < count + 1) {
usage(argv[0]);
exit(1);
}
dev = argv[count + 1];
}
}
if (!dev) {
usage(argv[0]);
exit(1);
}
memset(&mtstat, 0, sizeof(struct mtget));
memset(&mtpos, 0, sizeof(struct mtpos));
tape_fd = open(dev, O_RDWR);
if (tape_fd < 0) {
printf("Failed to open %s: %s\n",
dev, strerror(errno));
exit(-1);
}
/* Disable Compression */
set_compression(tape_fd, 0);
write_tape_pattern_1(tape_fd);
write_tape_pattern_2(tape_fd);
read_test_1(tape_fd);
read_test_2(tape_fd);
read_test_3(tape_fd);
read_test_4(tape_fd);
read_test_5(tape_fd);
err = ioctl(tape_fd, MTIOCGET, &mtstat); /* Query device status */
if (err) {
printf("%s: %s\n", __func__, strerror(errno));
exit(-1);
}
printf(" =======================\n");
printf(" Querying type drive\n");
printf(" =======================\n");
printf("Status from tape device: type: %s\n",
(mtstat.mt_type == MT_ISSCSI1) ? "SCSI-1" : "SCSI-2");
printf("Position: fileno: %d, blockno: %d\n",
mtstat.mt_fileno, mtstat.mt_blkno);
printf("Block size: %d, density: 0x%02x\n",
(unsigned int)mtstat.mt_dsreg & MT_ST_BLKSIZE_MASK,
(unsigned int)mtstat.mt_dsreg >> MT_ST_DENSITY_SHIFT);
printf("Drive is %sline\n", GMT_ONLINE(mtstat.mt_gstat) ? "On" : "Off");
printf("Drive is EOF: %s\n", GMT_EOF(mtstat.mt_gstat) ? "Yes" : "No");
printf("Drive is BOT: %s\n", GMT_BOT(mtstat.mt_gstat) ? "Yes" : "No");
printf("Drive is EOT: %s\n", GMT_EOT(mtstat.mt_gstat) ? "Yes" : "No");
printf("Drive is EOD: %s\n", GMT_EOD(mtstat.mt_gstat) ? "Yes" : "No");
printf("Drive is SM: %s\n", GMT_SM(mtstat.mt_gstat) ? "Yes" : "No");
printf("Drive is WRITE PROTECT: %s\n",
GMT_WR_PROT(mtstat.mt_gstat) ? "Yes" : "No");
printf("Tape is %sloaded in the drive\n",
GMT_DR_OPEN(mtstat.mt_gstat) ? "not " : "");
printf(" =======================\n\n");
close(tape_fd);
exit(0);
}