Differential D4515 Diff 11928 sys/boot/efi/boot1/zfs_module.c

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sys/boot/efi/boot1/zfs_module.c

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				/*-
				* Copyright (c) 2015 Eric McCorkle
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*
				* $FreeBSD$
				*/
				#include <stddef.h>
				#include <stdarg.h>
				#include <stdbool.h>
				#include <sys/cdefs.h>
				#include <sys/param.h>
				#include <sys/queue.h>
				#include <efi.h>

				#include "boot_module.h"

				#include "libzfs.h"
				#include "zfsimpl.c"

				static dev_info_t *devices;

				static int
				vdev_read(vdev_t vdev, void priv, off_t off, void *buf, size_t bytes)
				{
				dev_info_t *devinfo;
				off_t lba;

				devinfo = (dev_info_t *)priv;
				lba = off / devinfo->dev->Media->BlockSize;

				if (devinfo->dev->ReadBlocks(devinfo->dev,
				devinfo->dev->Media->MediaId, lba, bytes, buf) != EFI_SUCCESS)
				return (-1);

				return (0);
				}

				static EFI_STATUS
				probe(dev_info_t *dev)
				{
				spa_t *spa;
				dev_info_t *tdev;
				EFI_STATUS status;

				/* ZFS consumes the dev on success so we need a copy. */
				if ((status = bs->AllocatePool(EfiLoaderData, sizeof(*dev),
				(void**)&tdev)) != EFI_SUCCESS) {
				DPRINTF("Failed to allocate tdev (%lu)\n",
				EFI_ERROR_CODE(status));
				return (status);
				}
				memcpy(tdev, dev, sizeof(*dev));

				if (vdev_probe(vdev_read, tdev, &spa) != 0) {
				(void)bs->FreePool(tdev);
				return (EFI_UNSUPPORTED);
				}

				dev->devdata = spa;
				add_device(&devices, dev);

				return (EFI_SUCCESS);
				}

				static EFI_STATUS
				try_load(dev_info_t devinfo, const char loader_path, void *bufp, size_t bufsize)
				{
				spa_t *spa;
				struct zfsmount zfsmount;
				dnode_phys_t dn;
				struct stat st;
				int err;
				void *buf;
				EFI_STATUS status;

				spa = devinfo->devdata;
				if (zfs_spa_init(spa) != 0) {
				/* Init failed, don't report this loudly. */
				return (EFI_NOT_FOUND);
				}

				if (zfs_mount(spa, 0, &zfsmount) != 0) {
				/* Mount failed, don't report this loudly. */
				return (EFI_NOT_FOUND);
				}

				if ((err = zfs_lookup(&zfsmount, loader_path, &dn)) != 0) {
				printf("Failed to lookup %s on pool %s (%d)\n", loader_path,
				spa->spa_name, err);
				return (EFI_INVALID_PARAMETER);
				}

				if ((err = zfs_dnode_stat(spa, &dn, &st)) != 0) {
				printf("Failed to lookup %s on pool %s (%d)\n", loader_path,
				spa->spa_name, err);
				return (EFI_INVALID_PARAMETER);
				}

				if ((status = bs->AllocatePool(EfiLoaderData, (UINTN)st.st_size, &buf))
				!= EFI_SUCCESS) {
				printf("Failed to allocate load buffer for pool %s (%lu)\n",
				spa->spa_name, EFI_ERROR_CODE(status));
				return (EFI_INVALID_PARAMETER);
				}

				if ((err = dnode_read(spa, &dn, 0, buf, st.st_size)) != 0) {
				printf("Failed to read node from %s (%d)\n", spa->spa_name,
				err);
				(void)bs->FreePool(buf);
				return (EFI_INVALID_PARAMETER);
				}

				*bufsize = st.st_size;
				*bufp = buf;

				return (EFI_SUCCESS);
				}

				static EFI_STATUS
				load(const char loader_path, dev_info_t devinfop, void *bufp,
				size_t *bufsize)
				{
				dev_info_t *devinfo;
				EFI_STATUS status;

				for (devinfo = devices; devinfo != NULL; devinfo = devinfo->next) {
				status = try_load(devinfo, loader_path, bufp, bufsize);
				if (status == EFI_SUCCESS) {
				*devinfop = devinfo;
				return (EFI_SUCCESS);
				} else if (status != EFI_NOT_FOUND) {
				return (status);
				}
				}

				return (EFI_NOT_FOUND);
				}

				static void
				status()
				{
				spa_t *spa;

				spa = STAILQ_FIRST(&zfs_pools);
				if (spa == NULL) {
				printf("%s found no pools\n", zfs_module.name);
				return;
				}

				printf("%s found the following pools:", zfs_module.name);
				STAILQ_FOREACH(spa, &zfs_pools, spa_link)
				printf(" %s", spa->spa_name);

				printf("\n");
				}

				static void
				init()
				{

				zfs_init();
				}

				const boot_module_t zfs_module =
				{
				.name = "ZFS",
				.init = init,
				.probe = probe,
				.load = load,
				.status = status
				};