Exemplo n.º 1
0
void
vdev_queue_io_done(zio_t *zio)
{
	vdev_queue_t *vq = &zio->io_vd->vdev_queue;

	if (zio_injection_enabled)
		delay(SEC_TO_TICK(zio_handle_io_delay(zio)));

	mutex_enter(&vq->vq_lock);

	vdev_queue_pending_remove(vq, zio);

	vq->vq_io_complete_ts = gethrtime();

	for (int i = 0; i < zfs_vdev_ramp_rate; i++) {
		zio_t *nio = vdev_queue_io_to_issue(vq, zfs_vdev_max_pending);
		if (nio == NULL)
			break;
		mutex_exit(&vq->vq_lock);
		if (nio->io_done == vdev_queue_agg_io_done) {
			zio_nowait(nio);
		} else {
			zio_vdev_io_reissue(nio);
			zio_execute(nio);
		}
		mutex_enter(&vq->vq_lock);
	}

	mutex_exit(&vq->vq_lock);
}
Exemplo n.º 2
0
static void
vdev_disk_io_start(zio_t *zio)
{
	vdev_t *vd = zio->io_vd;
	vdev_disk_t *dvd = vd->vdev_tsd;
	struct buf *bp;
	vfs_context_t context;
	int flags, error = 0;

	/*
	 * 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_offline) || dvd->vd_devvp == NULL) {
		zio->io_error = ENXIO;
		zio_interrupt(zio);
		return;
	}

	switch (zio->io_type) {
		case ZIO_TYPE_IOCTL:

			if (!vdev_readable(vd)) {
				zio->io_error = SET_ERROR(ENXIO);
				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;
					}

					context = vfs_context_create(spl_vfs_context_kernel());
					error = VNOP_IOCTL(dvd->vd_devvp, DKIOCSYNCHRONIZECACHE,
									   NULL, FWRITE, context);
					(void) vfs_context_rele(context);

					if (error == 0)
						vdev_disk_ioctl_done(zio, error);
					else
						error = ENOTSUP;

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

			zio_execute(zio);
			return;

	case ZIO_TYPE_WRITE:
		if (zio->io_priority == ZIO_PRIORITY_SYNC_WRITE)
			flags = B_WRITE;
		else
			flags = B_WRITE | B_ASYNC;
		break;

	case ZIO_TYPE_READ:
		if (zio->io_priority == ZIO_PRIORITY_SYNC_READ)
			flags = B_READ;
		else
			flags = B_READ | B_ASYNC;
		break;

		default:
			zio->io_error = SET_ERROR(ENOTSUP);
			zio_interrupt(zio);
			return;
	} /* io_type */

	ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);

	/* Stop OSX from also caching our data */
	flags |= B_NOCACHE;

	if (zio->io_flags & ZIO_FLAG_FAILFAST)
		flags |= B_FAILFAST;

	zio->io_target_timestamp = zio_handle_io_delay(zio);

	bp = buf_alloc(dvd->vd_devvp);

	ASSERT(bp != NULL);
	ASSERT(zio->io_data != NULL);
	ASSERT(zio->io_size != 0);

	buf_setflags(bp, flags);
	buf_setcount(bp, zio->io_size);
	buf_setdataptr(bp, (uintptr_t)zio->io_data);

	/*
	 * Map offset to blcknumber, based on physical block number.
	 * (512, 4096, ..). If we fail to map, default back to
	 * standard 512. lbtodb() is fixed at 512.
	 */
	buf_setblkno(bp, zio->io_offset >> dvd->vd_ashift);
	buf_setlblkno(bp, zio->io_offset >> dvd->vd_ashift);

	buf_setsize(bp, zio->io_size);
	if (buf_setcallback(bp, vdev_disk_io_intr, zio) != 0)
		panic("vdev_disk_io_start: buf_setcallback failed\n");

	if (zio->io_type == ZIO_TYPE_WRITE) {
		vnode_startwrite(dvd->vd_devvp);
	}
	error = VNOP_STRATEGY(bp);
	ASSERT(error == 0);

	if (error) {
		zio->io_error = error;
		zio_interrupt(zio);
		return;
	}
}