static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
struct sg_io_hdr *hdr, fmode_t mode)
{
unsigned long start_time;
ssize_t ret = 0;
int writing = 0;
int at_head = 0;
struct request *rq;
char sense[SCSI_SENSE_BUFFERSIZE];
struct bio *bio;
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
return -EIO;
if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
break;
}
if (hdr->flags & SG_FLAG_Q_AT_HEAD)
at_head = 1;
ret = -ENOMEM;
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (IS_ERR(rq))
return PTR_ERR(rq);
blk_rq_set_block_pc(rq);
if (hdr->cmd_len > BLK_MAX_CDB) {
rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
if (!rq->cmd)
goto out_put_request;
}
ret = -EFAULT;
if (blk_fill_sghdr_rq(q, rq, hdr, mode))
goto out_free_cdb;
ret = 0;
if (hdr->iovec_count) {
struct iov_iter i;
struct iovec *iov = NULL;
ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
0, NULL, &iov);
if (ret < 0) {
kfree(iov);
goto out_free_cdb;
}
/* SG_IO howto says that the shorter of the two wins */
iov_iter_init(&i, rq_data_dir(rq), iov, hdr->iovec_count,
min_t(unsigned, ret, hdr->dxfer_len));
ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
kfree(iov);
} else if (hdr->dxfer_len)
static ssize_t scribe_do_readv_writev(int type, struct file *file,
const struct iovec __user * uvector,
unsigned long nr_segs, loff_t *pos)
{
struct scribe_ps *scribe = current->scribe;
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
int force_block = 0;
ssize_t ret, len = 0;
if (!is_scribed(scribe))
return do_readv_writev(type, file, uvector, nr_segs, 0, pos,
force_block);
if (is_kernel_copy())
goto out;
if (!should_scribe_data(scribe))
goto out;
scribe_need_syscall_ret(scribe);
if (is_replaying(scribe)) {
len = scribe->orig_ret;
if (len <= 0) {
rw_copy_check_uvector(type, uvector, nr_segs,
ARRAY_SIZE(iovstack), iovstack,
&iov);
ret = len;
goto free;
}
force_block = 1;
}
if (type == READ) {
if (is_deterministic(file))
goto out;
scribe_data_non_det();
if (is_recording(scribe))
goto out;
rw_copy_check_uvector(type, uvector, nr_segs,
ARRAY_SIZE(iovstack), iovstack, &iov);
ret = __do_loop_readv_writev(file, iov, nr_segs, len, pos,
io_scribe_emul_copy_to_user);
goto free;
}
out:
scribe->in_read_write = true;
ret = do_readv_writev(type, file, uvector, nr_segs, len, pos,
force_block);
scribe->in_read_write = false;
free:
if (iov != iovstack)
kfree(iov);
return ret;
}
