1 /*-
2 * Copyright (c) 2015 Eric McCorkle
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26 #include <stddef.h>
27 #include <stdarg.h>
28 #include <stdbool.h>
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/queue.h>
32 #include <efi.h>
33
34 #include "boot_module.h"
35
36 #include "libzfs.h"
37 #include "zfsimpl.c"
38
39 static dev_info_t *devices;
40
41 uint64_t
42 ldi_get_size(void *priv)
43 {
44 dev_info_t *devinfo = priv;
45
46 return (devinfo->dev->Media->BlockSize *
47 (devinfo->dev->Media->LastBlock + 1));
48 }
49
50 static int
51 vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes)
52 {
53 dev_info_t *devinfo;
54 uint64_t lba;
55 size_t size, remainder, rb_size, blksz;
56 char *bouncebuf = NULL, *rb_buf;
57 EFI_STATUS status;
58
59 devinfo = (dev_info_t *)priv;
60 lba = off / devinfo->dev->Media->BlockSize;
61 remainder = off % devinfo->dev->Media->BlockSize;
62
63 rb_buf = buf;
64 rb_size = bytes;
65
66 /*
67 * If we have remainder from off, we need to add remainder part.
68 * Since buffer must be multiple of the BlockSize, round it all up.
69 */
70 size = roundup2(bytes + remainder, devinfo->dev->Media->BlockSize);
71 blksz = size;
72 if (remainder != 0 || size != bytes) {
73 rb_size = devinfo->dev->Media->BlockSize;
74 bouncebuf = malloc(rb_size);
75 if (bouncebuf == NULL) {
76 printf("vdev_read: out of memory\n");
77 return (-1);
78 }
79 rb_buf = bouncebuf;
80 blksz = rb_size - remainder;
81 }
82
83 while (bytes > 0) {
84 status = devinfo->dev->ReadBlocks(devinfo->dev,
85 devinfo->dev->Media->MediaId, lba, rb_size, rb_buf);
86 if (status != EFI_SUCCESS)
87 goto error;
88 if (bytes < blksz)
89 blksz = bytes;
90 if (bouncebuf != NULL)
91 memcpy(buf, rb_buf + remainder, blksz);
92 buf = (void *)((uintptr_t)buf + blksz);
93 bytes -= blksz;
94 lba++;
95 remainder = 0;
96 blksz = rb_size;
97 }
98
99 free(bouncebuf);
100 return (0);
101
102 error:
103 free(bouncebuf);
104 DPRINTF("vdev_read: failed dev: %p, id: %u, lba: %ju, size: %zu,"
105 " rb_size: %zu, status: %lu\n", devinfo->dev,
106 devinfo->dev->Media->MediaId, (uintmax_t)lba, bytes, rb_size,
107 EFI_ERROR_CODE(status));
108 return (-1);
109 }
110
111 static EFI_STATUS
112 probe(dev_info_t *dev)
113 {
114 spa_t *spa;
115 dev_info_t *tdev;
116 EFI_STATUS status;
117
118 /* ZFS consumes the dev on success so we need a copy. */
119 if ((status = BS->AllocatePool(EfiLoaderData, sizeof(*dev),
120 (void**)&tdev)) != EFI_SUCCESS) {
121 DPRINTF("Failed to allocate tdev (%lu)\n",
122 EFI_ERROR_CODE(status));
123 return (status);
124 }
125 memcpy(tdev, dev, sizeof(*dev));
126
127 if (vdev_probe(vdev_read, tdev, &spa) != 0) {
128 (void)BS->FreePool(tdev);
129 return (EFI_UNSUPPORTED);
130 }
131
132 dev->devdata = spa;
133 add_device(&devices, dev);
134
135 return (EFI_SUCCESS);
136 }
137
138 static EFI_STATUS
139 load(const char *filepath, dev_info_t *devinfo, void **bufp, size_t *bufsize)
140 {
141 spa_t *spa;
142 struct zfsmount zfsmount;
143 dnode_phys_t dn;
144 struct stat st;
145 int err;
146 void *buf;
147 EFI_STATUS status;
148
149 spa = devinfo->devdata;
150
151 DPRINTF("load: '%s' spa: '%s', devpath: %s\n", filepath, spa->spa_name,
152 devpath_str(devinfo->devpath));
153
154 if ((err = zfs_spa_init(spa)) != 0) {
155 DPRINTF("Failed to load pool '%s' (%d)\n", spa->spa_name, err);
156 return (EFI_NOT_FOUND);
157 }
158
159 if ((err = zfs_mount(spa, 0, &zfsmount)) != 0) {
160 DPRINTF("Failed to mount pool '%s' (%d)\n", spa->spa_name, err);
161 return (EFI_NOT_FOUND);
162 }
163
164 if ((err = zfs_lookup(&zfsmount, filepath, &dn)) != 0) {
165 if (err == ENOENT) {
166 DPRINTF("Failed to find '%s' on pool '%s' (%d)\n",
167 filepath, spa->spa_name, err);
168 return (EFI_NOT_FOUND);
169 }
170 printf("Failed to lookup '%s' on pool '%s' (%d)\n", filepath,
171 spa->spa_name, err);
172 return (EFI_INVALID_PARAMETER);
173 }
174
175 if ((err = zfs_dnode_stat(spa, &dn, &st)) != 0) {
176 printf("Failed to stat '%s' on pool '%s' (%d)\n", filepath,
177 spa->spa_name, err);
178 return (EFI_INVALID_PARAMETER);
179 }
180
181 if ((status = BS->AllocatePool(EfiLoaderData, (UINTN)st.st_size, &buf))
182 != EFI_SUCCESS) {
183 printf("Failed to allocate load buffer %zd for pool '%s' for '%s' "
184 "(%lu)\n", st.st_size, spa->spa_name, filepath, EFI_ERROR_CODE(status));
185 return (EFI_INVALID_PARAMETER);
186 }
187
188 if ((err = dnode_read(spa, &dn, 0, buf, st.st_size)) != 0) {
189 printf("Failed to read node from %s (%d)\n", spa->spa_name,
190 err);
191 (void)BS->FreePool(buf);
192 return (EFI_INVALID_PARAMETER);
193 }
194
195 *bufsize = st.st_size;
196 *bufp = buf;
197
198 return (EFI_SUCCESS);
199 }
200
201 static void
202 status(void)
203 {
204 spa_t *spa;
205
206 spa = STAILQ_FIRST(&zfs_pools);
207 if (spa == NULL) {
208 printf("%s found no pools\n", zfs_module.name);
209 return;
210 }
211
212 printf("%s found the following pools:", zfs_module.name);
213 STAILQ_FOREACH(spa, &zfs_pools, spa_link)
214 printf(" %s", spa->spa_name);
215
216 printf("\n");
217 }
218
219 static void
220 init(void)
221 {
222
223 zfs_init();
224 }
225
226 static dev_info_t *
227 _devices(void)
228 {
229
230 return (devices);
231 }
232
233 const boot_module_t zfs_module =
234 {
235 .name = "ZFS",
236 .init = init,
237 .probe = probe,
238 .load = load,
239 .status = status,
240 .devices = _devices
241 };