1 /*- 2 * Copyright (c) 2005 Takanori Watanabe 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 35 #include <fs/ntfs/ntfs.h> 36 37 #include <geom/geom.h> 38 #include <geom/label/g_label.h> 39 40 #define G_LABEL_NTFS_DIR "ntfs" 41 42 43 static void 44 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size) 45 { 46 struct g_provider *pp; 47 struct bootfile *bf; 48 struct filerec *fr; 49 struct attr *atr; 50 off_t voloff; 51 char *filerecp, *ap; 52 char mftrecsz, vnchar; 53 int recsize, j; 54 55 g_topology_assert_not(); 56 57 label[0] = '\0'; 58 pp = cp->provider; 59 filerecp = NULL; 60 61 bf = (struct bootfile *)g_read_data(cp, 0, pp->sectorsize, NULL); 62 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0) 63 goto done; 64 65 mftrecsz = (char)bf->bf_mftrecsz; 66 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz); 67 if (recsize % pp->sectorsize != 0) 68 goto done; 69 70 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps + 71 recsize * NTFS_VOLUMEINO; 72 if (voloff % pp->sectorsize != 0) 73 goto done; 74 75 filerecp = g_read_data(cp, voloff, recsize, NULL); 76 if (filerecp == NULL) 77 goto done; 78 fr = (struct filerec *)filerecp; 79 80 if (fr->fr_fixup.fh_magic != NTFS_FILEMAGIC) 81 goto done; 82 83 for (ap = filerecp + fr->fr_attroff; 84 atr = (struct attr *)ap, atr->a_hdr.a_type != -1; 85 ap += atr->a_hdr.reclen) { 86 if (atr->a_hdr.a_type == NTFS_A_VOLUMENAME) { 87 if(atr->a_r.a_datalen >= size *2){ 88 label[0] = 0; 89 goto done; 90 } 91 /* 92 *UNICODE to ASCII. 93 * Should we need to use iconv(9)? 94 */ 95 for (j = 0; j < atr->a_r.a_datalen; j++) { 96 vnchar = *(ap + atr->a_r.a_dataoff + j); 97 if (j & 1) { 98 if (vnchar) { 99 label[0] = 0; 100 goto done; 101 } 102 } else { 103 label[j / 2] = vnchar; 104 } 105 } 106 label[j / 2] = 0; 107 break; 108 } 109 } 110 done: 111 if (bf != NULL) 112 g_free(bf); 113 if (filerecp != NULL) 114 g_free(filerecp); 115 } 116 117 struct g_label_desc g_label_ntfs = { 118 .ld_taste = g_label_ntfs_taste, 119 .ld_dir = G_LABEL_NTFS_DIR, 120 .ld_enabled = 1 121 }; 122 123 G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes"); 124