efi/boot1/zfs_module.c

	zfs_module.c revision 199767f8919635c4928607450d9e0abb932109ce
/*-
 * 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;
    EFI_STATUS status;

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

    status = devinfo->dev->ReadBlocks(devinfo->dev,
        devinfo->dev->Media->MediaId, lba, bytes, buf);
    if (status != EFI_SUCCESS) {
        DPRINTF("vdev_read: failed dev: %p, id: %u, lba: %zu, size: %zu,"
                    " status: %lu\n", devinfo->dev,
                    devinfo->dev->Media->MediaId, lba, bytes,
                    EFI_ERROR_CODE(status));
        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
load(const char *filepath, dev_info_t *devinfo, 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;

    DPRINTF("load: '%s' spa: '%s', devpath: %s\n", filepath, spa->spa_name,
        devpath_str(devinfo->devpath));

    if ((err = zfs_spa_init(spa)) != 0) {
        DPRINTF("Failed to load pool '%s' (%d)\n", spa->spa_name, err);
        return (EFI_NOT_FOUND);
    }

    if ((err = zfs_mount(spa, 0, &zfsmount)) != 0) {
        DPRINTF("Failed to mount pool '%s' (%d)\n", spa->spa_name, err);
        return (EFI_NOT_FOUND);
    }

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

    if ((err = zfs_dnode_stat(spa, &dn, &st)) != 0) {
        printf("Failed to stat '%s' on pool '%s' (%d)\n", filepath,
            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 %zd for pool '%s' for '%s' "
            "(%lu)\n", st.st_size, spa->spa_name, filepath, 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 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();
}

static dev_info_t *
_devices()
{

    return (devices);
}

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