efizfs.c revision 332128 
1/*-
2 * Copyright (c) 2008-2010 Rui Paulo
3 * Copyright (c) 2006 Marcel Moolenaar
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/11/stand/efi/libefi/efizfs.c 332128 2018-04-06 18:40:24Z kevans $");
30
31#include <sys/param.h>
32#include <sys/disk.h>
33#include <stdint.h>
34
35#ifdef EFI_ZFS_BOOT
36#include <libzfs.h>
37#endif
38
39#include <efi.h>
40#include <efilib.h>
41
42#include "efizfs.h"
43
44#ifdef EFI_ZFS_BOOT
45static zfsinfo_list_t zfsinfo;
46
47uint64_t pool_guid;
48
49zfsinfo_list_t *
50efizfs_get_zfsinfo_list(void)
51{
52	return (&zfsinfo);
53}
54
55EFI_HANDLE
56efizfs_get_handle_by_guid(uint64_t guid)
57{
58	zfsinfo_t *zi;
59
60	STAILQ_FOREACH(zi, &zfsinfo, zi_link) {
61		if (zi->zi_pool_guid == guid) {
62			return (zi->zi_handle);
63		}
64	}
65	return (NULL);
66}
67
68static void
69insert_zfs(EFI_HANDLE handle, uint64_t guid)
70{
71        zfsinfo_t *zi;
72
73        zi = malloc(sizeof(zfsinfo_t));
74        zi->zi_handle = handle;
75        zi->zi_pool_guid = guid;
76        STAILQ_INSERT_TAIL(&zfsinfo, zi, zi_link);
77}
78
79void
80efi_zfs_probe(void)
81{
82	pdinfo_list_t *hdi;
83	pdinfo_t *hd, *pd = NULL;
84	char devname[SPECNAMELEN + 1];
85        uint64_t guid;
86
87	hdi = efiblk_get_pdinfo_list(&efipart_hddev);
88	STAILQ_INIT(&zfsinfo);
89
90	/*
91	 * Find the handle for the boot device. The boot1 did find the
92	 * device with loader binary, now we need to search for the
93	 * same device and if it is part of the zfs pool, we record the
94	 * pool GUID for currdev setup.
95	 */
96	STAILQ_FOREACH(hd, hdi, pd_link) {
97		STAILQ_FOREACH(pd, &hd->pd_part, pd_link) {
98
99			snprintf(devname, sizeof(devname), "%s%dp%d:",
100			    efipart_hddev.dv_name, hd->pd_unit, pd->pd_unit);
101
102                        if (zfs_probe_dev(devname, &guid) == 0) {
103                                insert_zfs(pd->pd_handle, guid);
104
105                                if (efi_zfs_is_preferred(pd->pd_handle))
106                                        pool_guid = guid;
107                        }
108
109		}
110	}
111}
112#endif
113