Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_ntfs.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Takanori Watanabe 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 37 #include <geom/geom.h> 38 #include <geom/label/g_label.h> 39 40 #define NTFS_A_VOLUMENAME 0x60 41 #define NTFS_FILEMAGIC ((uint32_t)(0x454C4946)) 42 #define NTFS_VOLUMEINO 3 43 44 struct ntfs_attr { 45 uint32_t a_type; 46 uint32_t reclen; 47 uint8_t a_flag; 48 uint8_t a_namelen; 49 uint8_t a_nameoff; 50 uint8_t reserved1; 51 uint8_t a_compression; 52 uint8_t reserved2; 53 uint16_t a_index; 54 uint16_t a_datalen; 55 uint16_t reserved3; 56 uint16_t a_dataoff; 57 uint16_t a_indexed; 58 } __packed; 59 60 struct ntfs_filerec { 61 uint32_t fr_hdrmagic; 62 uint16_t fr_hdrfoff; 63 uint16_t fr_hdrfnum; 64 uint8_t reserved[8]; 65 uint16_t fr_seqnum; 66 uint16_t fr_nlink; 67 uint16_t fr_attroff; 68 uint16_t fr_flags; 69 uint32_t fr_size; 70 uint32_t fr_allocated; 71 uint64_t fr_mainrec; 72 uint16_t fr_attrnum; 73 } __packed; 74 75 struct ntfs_bootfile { 76 uint8_t reserved1[3]; 77 uint8_t bf_sysid[8]; 78 uint16_t bf_bps; 79 uint8_t bf_spc; 80 uint8_t reserved2[7]; 81 uint8_t bf_media; 82 uint8_t reserved3[2]; 83 uint16_t bf_spt; 84 uint16_t bf_heads; 85 uint8_t reserver4[12]; 86 uint64_t bf_spv; 87 uint64_t bf_mftcn; 88 uint64_t bf_mftmirrcn; 89 int8_t bf_mftrecsz; 90 uint32_t bf_ibsz; 91 uint32_t bf_volsn; 92 } __packed; 93 94 static void 95 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size) 96 { 97 struct g_provider *pp; 98 struct ntfs_bootfile *bf; 99 struct ntfs_filerec *fr; 100 struct ntfs_attr *atr; 101 off_t voloff; 102 size_t recoff; 103 char *filerecp; 104 int8_t mftrecsz; 105 char vnchar; 106 int recsize, j; 107 108 g_topology_assert_not(); 109 110 label[0] = '\0'; 111 pp = cp->provider; 112 bf = NULL; 113 filerecp = NULL; 114 115 if (pp->sectorsize < sizeof(*bf)) 116 goto done; 117 118 bf = g_read_data(cp, 0, pp->sectorsize, NULL); 119 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0) 120 goto done; 121 122 mftrecsz = bf->bf_mftrecsz; 123 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : 124 (1 << -mftrecsz); 125 if (recsize <= 0 || recsize > maxphys || recsize % pp->sectorsize != 0) 126 goto done; 127 128 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps + 129 recsize * NTFS_VOLUMEINO; 130 if (voloff % pp->sectorsize != 0) 131 goto done; 132 133 filerecp = g_read_data(cp, voloff, recsize, NULL); 134 if (filerecp == NULL) 135 goto done; 136 fr = (struct ntfs_filerec *)filerecp; 137 if (fr->fr_hdrmagic != NTFS_FILEMAGIC) 138 goto done; 139 140 for (recoff = fr->fr_attroff; 141 recoff <= recsize - 2 * sizeof(uint32_t); 142 recoff += atr->reclen) { 143 atr = (struct ntfs_attr *)(filerecp + recoff); 144 if (atr->a_type == -1) 145 break; 146 if (atr->reclen < sizeof(*atr)) 147 break; 148 if (recsize - recoff < atr->reclen) 149 break; 150 if (atr->a_type == NTFS_A_VOLUMENAME) { 151 if (atr->a_dataoff > atr->reclen || 152 atr->a_datalen > atr->reclen - atr->a_dataoff) 153 break; 154 155 /* 156 * UNICODE to ASCII. 157 * Should we need to use iconv(9)? 158 */ 159 if (atr->a_datalen >= size * 2 || 160 atr->a_datalen % 2 != 0) 161 break; 162 for (j = 0; j < atr->a_datalen; j++) { 163 vnchar = ((char *)atr)[atr->a_dataoff + j]; 164 if (j & 1) { 165 if (vnchar) { 166 label[0] = 0; 167 goto done; 168 } 169 } else { 170 label[j / 2] = vnchar; 171 } 172 } 173 label[j / 2] = 0; 174 break; 175 } 176 } 177 done: 178 g_free(bf); 179 g_free(filerecp); 180 } 181 182 struct g_label_desc g_label_ntfs = { 183 .ld_taste = g_label_ntfs_taste, 184 .ld_dirprefix = "ntfs/", 185 .ld_enabled = 1 186 }; 187 188 G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes");
Cache object: b151b1f770e53d2fc8ceff3bf3743635
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