Example #1
0
int
vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data,
    size_t size, uint64_t offset, int flags)
{
#ifdef illumos
	buf_t *bp;
#else
	ldi_buf_t *bp;
#endif
	int error = 0;

	if (vd_lh == NULL)
		return (SET_ERROR(EINVAL));

	ASSERT(flags & B_READ || flags & B_WRITE);

	bp = getrbuf(KM_SLEEP);
	bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST;
	bp->b_bcount = size;
	bp->b_un.b_addr = (void *)data;
	bp->b_lblkno = lbtodb(offset);
	bp->b_bufsize = size;

	error = ldi_strategy(vd_lh, bp);
	ASSERT(error == 0);

	if ((error = biowait(bp)) == 0 && bp->b_resid != 0)
		error = SET_ERROR(EIO);
	freerbuf(bp);

	return (error);
}
Example #2
0
static void
vdev_disk_io_start(zio_t *zio)
{
	vdev_t *vd = zio->io_vd;
	vdev_disk_t *dvd;
	vdev_buf_t *vb;
	struct dk_callback *dkc;
	buf_t *bp;
	int error;

	rw_enter(&vd->vdev_tsd_lock, RW_READER);
	dvd = vd->vdev_tsd;
	/*
	 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
	 * Nothing to be done here but return failure.
	 */
	if (dvd == NULL || dvd->vd_lh == NULL) {
		zio->io_error = ENXIO;
		rw_exit(&vd->vdev_tsd_lock);
		zio_interrupt(zio);
		return;
	}

	if (zio->io_type == ZIO_TYPE_IOCTL) {
		/* XXPOLICY */
		if (!vdev_readable(vd)) {
			zio->io_error = SET_ERROR(ENXIO);
			rw_exit(&vd->vdev_tsd_lock);
			zio_interrupt(zio);
			return;
		}

		switch (zio->io_cmd) {

		case DKIOCFLUSHWRITECACHE:

			if (zfs_nocacheflush)
				break;

			if (vd->vdev_nowritecache) {
				zio->io_error = SET_ERROR(ENOTSUP);
				break;
			}

			zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP);
			zio->io_vsd_ops = &vdev_disk_vsd_ops;

			dkc->dkc_callback = vdev_disk_ioctl_done;
			dkc->dkc_flag = FLUSH_VOLATILE;
			dkc->dkc_cookie = zio;

			error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
			    (uintptr_t)dkc, FKIOCTL, kcred, NULL);

			if (error == 0) {
				/*
				 * The ioctl will be done asychronously,
				 * and will call vdev_disk_ioctl_done()
				 * upon completion.
				 */
				rw_exit(&vd->vdev_tsd_lock);
				return;
			}

			if (error == ENOTSUP || error == ENOTTY) {
				/*
				 * If we get ENOTSUP or ENOTTY, we know that
				 * no future attempts will ever succeed.
				 * In this case we set a persistent bit so
				 * that we don't bother with the ioctl in the
				 * future.
				 */
				vd->vdev_nowritecache = B_TRUE;
			}
			zio->io_error = error;

			break;

		case DKIOCFREE:
			/*
			 * We perform device support checks here instead of
			 * in zio_trim(), as zio_trim() might be invoked on
			 * top of a top-level vdev, whereas vdev_disk_io_start
			 * is guaranteed to be operating a leaf vdev.
			 */
			if (vd->vdev_notrim &&
			    spa_get_force_trim(vd->vdev_spa) !=
			    SPA_FORCE_TRIM_ON) {
				zio->io_error = SET_ERROR(ENOTSUP);
				break;
			}

			/*
			 * zio->io_private contains a dkioc_free_list_t
			 * specifying which offsets are to be freed
			 */
			ASSERT(zio->io_private != NULL);
			error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
			    (uintptr_t)zio->io_private, FKIOCTL, kcred, NULL);

			if (error == ENOTSUP || error == ENOTTY)
				vd->vdev_notrim = B_TRUE;
			zio->io_error = error;

			break;

		default:
			zio->io_error = SET_ERROR(ENOTSUP);
		}

		rw_exit(&vd->vdev_tsd_lock);
		zio_execute(zio);
		return;
	}

	vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP);

	vb->vb_io = zio;
	bp = &vb->vb_buf;

	bioinit(bp);
	bp->b_flags = B_BUSY | B_NOCACHE |
	    (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
	if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
		bp->b_flags |= B_FAILFAST;
	bp->b_bcount = zio->io_size;
	bp->b_un.b_addr = zio->io_data;
	bp->b_lblkno = lbtodb(zio->io_offset);
	bp->b_bufsize = zio->io_size;
	bp->b_iodone = (int (*)())vdev_disk_io_intr;

	/* ldi_strategy() will return non-zero only on programming errors */
	VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0);
	rw_exit(&vd->vdev_tsd_lock);
}
Example #3
0
static int
vdev_disk_io_start(zio_t *zio)
{
	vdev_t *vd = zio->io_vd;
	vdev_disk_t *dvd = vd->vdev_tsd;
	vdev_buf_t *vb;
	struct dk_callback *dkc;
	buf_t *bp;
	int error;

	/*
	 * If the vdev is closed, it's likely in the REMOVED or FAULTED state.
	 * Nothing to be done here but return failure.
	 */
	if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) {
		zio->io_error = ENXIO;
		return (ZIO_PIPELINE_CONTINUE);
	}

	if (zio->io_type == ZIO_TYPE_IOCTL) {
		/* XXPOLICY */
		if (!vdev_readable(vd)) {
			zio->io_error = SET_ERROR(ENXIO);
			return (ZIO_PIPELINE_CONTINUE);
		}

		switch (zio->io_cmd) {

		case DKIOCFLUSHWRITECACHE:

			if (zfs_nocacheflush)
				break;

			if (vd->vdev_nowritecache) {
				zio->io_error = SET_ERROR(ENOTSUP);
				break;
			}

			zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP);
			zio->io_vsd_ops = &vdev_disk_vsd_ops;

			dkc->dkc_callback = vdev_disk_ioctl_done;
			dkc->dkc_flag = FLUSH_VOLATILE;
			dkc->dkc_cookie = zio;

			error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
			    (uintptr_t)dkc, FKIOCTL, kcred, NULL);

			if (error == 0) {
				/*
				 * The ioctl will be done asychronously,
				 * and will call vdev_disk_ioctl_done()
				 * upon completion.
				 */
				return (ZIO_PIPELINE_STOP);
			}

			if (error == ENOTSUP || error == ENOTTY) {
				/*
				 * If we get ENOTSUP or ENOTTY, we know that
				 * no future attempts will ever succeed.
				 * In this case we set a persistent bit so
				 * that we don't bother with the ioctl in the
				 * future.
				 */
				vd->vdev_nowritecache = B_TRUE;
			}
			zio->io_error = error;

			break;

		default:
			zio->io_error = SET_ERROR(ENOTSUP);
		}

		return (ZIO_PIPELINE_CONTINUE);
	}

	vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP);

	vb->vb_io = zio;
	bp = &vb->vb_buf;

	bioinit(bp);
	bp->b_flags = B_BUSY | B_NOCACHE |
	    (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
	if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
		bp->b_flags |= B_FAILFAST;
	bp->b_bcount = zio->io_size;
	bp->b_un.b_addr = zio->io_data;
	bp->b_lblkno = lbtodb(zio->io_offset);
	bp->b_bufsize = zio->io_size;
	bp->b_iodone = (int (*)())vdev_disk_io_intr;

	zfs_zone_zio_start(zio);

	/* ldi_strategy() will return non-zero only on programming errors */
	VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0);

	return (ZIO_PIPELINE_STOP);
}