1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 #include <sys/zfs_context.h>
24 #include <sys/spa.h>
25 #include <sys/spa_impl.h>
26 #include <sys/dmu.h>
27 #include <sys/zap.h>
28 #include <sys/vdev.h>
29 #include <sys/vdev_os.h>
30 #include <sys/vdev_impl.h>
31 #include <sys/uberblock_impl.h>
32 #include <sys/metaslab.h>
33 #include <sys/metaslab_impl.h>
34 #include <sys/zio.h>
35 #include <sys/dsl_scan.h>
36 #include <sys/abd.h>
37 #include <sys/fs/zfs.h>
38
39 int
vdev_label_write_pad2(vdev_t * vd,const char * buf,size_t size)40 vdev_label_write_pad2(vdev_t *vd, const char *buf, size_t size)
41 {
42 spa_t *spa = vd->vdev_spa;
43 zio_t *zio;
44 abd_t *pad2;
45 int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
46 int error;
47
48 if (size > VDEV_PAD_SIZE)
49 return (EINVAL);
50
51 if (!vd->vdev_ops->vdev_op_leaf)
52 return (ENODEV);
53 if (vdev_is_dead(vd))
54 return (ENXIO);
55
56 ASSERT3U(spa_config_held(spa, SCL_ALL, RW_WRITER), ==, SCL_ALL);
57
58 pad2 = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE);
59 abd_copy_from_buf(pad2, buf, size);
60 abd_zero_off(pad2, size, VDEV_PAD_SIZE - size);
61
62 retry:
63 zio = zio_root(spa, NULL, NULL, flags);
64 vdev_label_write(zio, vd, 0, pad2,
65 offsetof(vdev_label_t, vl_be),
66 VDEV_PAD_SIZE, NULL, NULL, flags);
67 error = zio_wait(zio);
68 if (error != 0 && !(flags & ZIO_FLAG_TRYHARD)) {
69 flags |= ZIO_FLAG_TRYHARD;
70 goto retry;
71 }
72
73 abd_free(pad2);
74 return (error);
75 }
76
77 static void
vdev_child_done(zio_t * zio)78 vdev_child_done(zio_t *zio)
79 {
80 zio_t *pio = zio->io_private;
81
82 mutex_enter(&pio->io_lock);
83 pio->io_error = zio_worst_error(pio->io_error, zio->io_error);
84 mutex_exit(&pio->io_lock);
85 }
86
87 /*
88 * Check if the reserved boot area is in-use.
89 *
90 * When booting FreeBSD with an MBR partition with ZFS, the zfsboot file
91 * (which understands the ZFS file system) is written to the ZFS BOOT
92 * reserve area (at offset 512K). We check for that here before attaching
93 * a disk to raidz which would then corrupt this boot data.
94 */
95 int
vdev_check_boot_reserve(spa_t * spa,vdev_t * childvd)96 vdev_check_boot_reserve(spa_t *spa, vdev_t *childvd)
97 {
98 ASSERT(childvd->vdev_ops->vdev_op_leaf);
99
100 size_t size = 1ULL << childvd->vdev_top->vdev_ashift;
101 abd_t *abd = abd_alloc_linear(size, B_FALSE);
102
103 zio_t *pio = zio_root(spa, NULL, NULL, 0);
104 /*
105 * Note: zio_vdev_child_io() adds VDEV_LABEL_START_SIZE to the offset
106 * to calculate the physical offset to write to. Passing in a negative
107 * offset lets us access the boot area.
108 */
109 zio_nowait(zio_vdev_child_io(pio, NULL, childvd,
110 VDEV_BOOT_OFFSET - VDEV_LABEL_START_SIZE, abd, size, ZIO_TYPE_READ,
111 ZIO_PRIORITY_ASYNC_READ, 0, vdev_child_done, pio));
112 zio_wait(pio);
113
114 unsigned char *buf = abd_to_buf(abd);
115
116 /*
117 * The BTX server has a special header at the begining.
118 *
119 * btx_hdr: .byte 0xeb # Machine ID
120 * .byte 0xe # Header size
121 * .ascii "BTX" # Magic
122 * .byte 0x1 # Major version
123 * .byte 0x2 # Minor version
124 * .byte BTX_FLAGS # Flags
125 */
126 if (buf[0] == 0xeb && buf[1] == 0x0e &&
127 buf[2] == 'B' && buf[3] == 'T' && buf[4] == 'X') {
128 abd_free(abd);
129 return (EBUSY);
130 }
131
132 abd_free(abd);
133 return (0);
134 }
135