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 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 ZIO_FLAG_TRYHARD; 47 int error; 48 49 if (size > VDEV_PAD_SIZE) 50 return (EINVAL); 51 52 if (!vd->vdev_ops->vdev_op_leaf) 53 return (ENODEV); 54 if (vdev_is_dead(vd)) 55 return (ENXIO); 56 57 ASSERT3U(spa_config_held(spa, SCL_ALL, RW_WRITER), ==, SCL_ALL); 58 59 pad2 = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE); 60 abd_copy_from_buf(pad2, buf, size); 61 abd_zero_off(pad2, size, VDEV_PAD_SIZE - size); 62 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 69 abd_free(pad2); 70 return (error); 71 } 72 73 static void 74 vdev_child_done(zio_t *zio) 75 { 76 zio_t *pio = zio->io_private; 77 78 mutex_enter(&pio->io_lock); 79 pio->io_error = zio_worst_error(pio->io_error, zio->io_error); 80 mutex_exit(&pio->io_lock); 81 } 82 83 /* 84 * Check if the reserved boot area is in-use. 85 * 86 * When booting FreeBSD with an MBR partition with ZFS, the zfsboot file 87 * (which understands the ZFS file system) is written to the ZFS BOOT 88 * reserve area (at offset 512K). We check for that here before attaching 89 * a disk to raidz which would then corrupt this boot data. 90 */ 91 int 92 vdev_check_boot_reserve(spa_t *spa, vdev_t *childvd) 93 { 94 ASSERT(childvd->vdev_ops->vdev_op_leaf); 95 96 size_t size = 1ULL << childvd->vdev_top->vdev_ashift; 97 abd_t *abd = abd_alloc_linear(size, B_FALSE); 98 99 zio_t *pio = zio_root(spa, NULL, NULL, 0); 100 /* 101 * Note: zio_vdev_child_io() adds VDEV_LABEL_START_SIZE to the offset 102 * to calculate the physical offset to write to. Passing in a negative 103 * offset lets us access the boot area. 104 */ 105 zio_nowait(zio_vdev_child_io(pio, NULL, childvd, 106 VDEV_BOOT_OFFSET - VDEV_LABEL_START_SIZE, abd, size, ZIO_TYPE_READ, 107 ZIO_PRIORITY_ASYNC_READ, 0, vdev_child_done, pio)); 108 zio_wait(pio); 109 110 unsigned char *buf = abd_to_buf(abd); 111 112 /* 113 * The BTX server has a special header at the begining. 114 * 115 * btx_hdr: .byte 0xeb # Machine ID 116 * .byte 0xe # Header size 117 * .ascii "BTX" # Magic 118 * .byte 0x1 # Major version 119 * .byte 0x2 # Minor version 120 * .byte BTX_FLAGS # Flags 121 */ 122 if (buf[0] == 0xeb && buf[1] == 0x0e && 123 buf[2] == 'B' && buf[3] == 'T' && buf[4] == 'X') { 124 abd_free(abd); 125 return (EBUSY); 126 } 127 128 abd_free(abd); 129 return (0); 130 } 131