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SubjectSG_DXFER_TO_FROM_DEV does not copy user buffer to driver buffer in linux 2.6.28 and later?
From
Test with the following program, and dump the data buf at queuecommand
of the driver, found the data is something like:
"00 00 00 00 ff 53 4d 42 2e 00 00 00 00 80 01 c0 00 00 00 00 00 00 00
00 00 00 00 00 02 20 4a ..."
While before 2.6.28, it is "ec ec ec ec ..." as expected.


#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <scsi/sg.h>

int main(int argc, char* argv[])
{
       int fd;
       sg_io_hdr_t io_hdr;
       int ret;

       unsigned char sensebuf[32], cdb[16], outbuf[256];

       if ((argc!=2) || (fd = open(argv[1], O_RDWR)) < 0) {
               return -1;
       }

       memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
       memset(cdb, 0, sizeof(cdb));
       memset(outbuf, 0xec, sizeof(outbuf));
       memset(sensebuf, 0xec, sizeof(sensebuf));

       io_hdr.interface_id = 'S';

       io_hdr.cmdp = cdb;
       io_hdr.cmd_len = sizeof(cdb);

       io_hdr.sbp = sensebuf;
       io_hdr.mx_sb_len = sizeof(sensebuf);

       io_hdr.dxferp = outbuf;
       io_hdr.dxfer_len = sizeof(outbuf);
       io_hdr.dxfer_direction = SG_DXFER_TO_FROM_DEV;

       io_hdr.timeout = 20000;

       ret = ioctl(fd, SG_IO, &io_hdr);
       return 0;
}
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