Driver list,
I have an issue I can't figure out. Any help would be appreciated.
I have written a block driver that works in most cases except one: using
aio_cancel64 to cancel pending DMA(s).
If I run the program below compiled with "gcc test.c", my system hangs.
This test is queuing 16 asynchronous DMAs to the block layer. It then
immediately cancels all DMAs.
If I run the program below compiled with "gcc -DADD_DELAY=1 test.c" my
system does not hang. In this case the added delay is allowing all the
pending DMAs to complete prior to calling aio_cancel64.
I figure I don't have some aio_cancel hook filled out in my driver. As
far as I can tell -- nothing like that exists. Can anyone shed light on
what I need to do to support aio_cancel64?
-Adam
#define BUF_SIZE 8*1024*1024
#define NUM_IOS 16
int main(int argc, char **argv) {
struct aiocb64 aiocb[NUM_IOS];
char *ptr, *buf;
int fd, st, ii;
ptr = malloc(NUM_IOS * BUF_SIZE);
memset(ptr, 0, NUM_IOS * BUF_SIZE);
#ifdef ADD_DELAY
printf("Adding delay\n");
#endif
fd = open("/dev/dsk/c9d0s0", O_RDWR | O_LARGEFILE | O_SYNC);
memset(aiocb, 0, sizeof(aiocb));
buf = ptr;
for (ii = 0; ii < NUM_IOS; ii++) {
aiocb[ii].aio_fildes = fd;
aiocb[ii].aio_buf = buf;
aiocb[ii].aio_offset = ii * BUF_SIZE;
aiocb[ii].aio_nbytes = BUF_SIZE;
aio_write64(&aiocb[ii]);
buf += BUF_SIZE;
}
#ifdef ADD_DELAY
sleep(2);
#endif
aio_cancel64(fd, NULL);
close(fd);
free(ptr);
return 0;
}
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