1 /* blkid.c - Prints type, label and UUID of filesystem(s).
3 * Copyright 2013 Brad Conroy <bconroy@uis.edu>
5 * See ftp://ftp.kernel.org/pub/linux/utils/util-linux/v2.24/libblkid-docs/api-index-full.html
7 USE_BLKID(NEWTOY(blkid, 0, TOYFLAG_BIN))
8 USE_FSTYPE(NEWTOY(fstype, "<1", TOYFLAG_BIN))
16 Prints type, label and UUID of filesystem on a block device or image.
24 Prints type of filesystem on a block device or image.
33 int magic_len, magic_offset, uuid_off, label_len, label_off;
36 static const struct fstype fstypes[] = {
37 {"ext2", 0xEF53, 2, 1080, 1128, 16, 1144}, // keep this first for ext3/4 check
38 {"swap", 0x4341505350415753LL, 8, 4086, 1036, 15, 1052},
39 // NTFS label actually 8/16 0x4d80 but horrible: 16 bit wide characters via
40 // codepage, something called a uuid that's only 8 bytes long...
41 {"ntfs", 0x5346544e, 4, 3, 0x48+(8<<24), 0, 0},
43 {"adfs", 0xadf5, 2, 0xc00, 0,0,0},
44 {"bfs", 0x1badface, 4, 0, 0,0,0},
45 {"btrfs", 0x4D5F53665248425FULL, 8, 65600, 65803, 256, 65819},
46 {"cramfs", 0x28cd3d45, 4, 0, 0, 16, 48},
47 {"f2fs", 0xF2F52010, 4, 1024, 1132, 16, 1110},
48 {"jfs", 0x3153464a, 4, 32768, 32920, 16, 32904},
49 {"nilfs", 0x3434, 2, 1030, 1176, 80, 1192},
50 {"reiserfs", 0x724573496552ULL, 6, 8244, 8276, 16, 8292},
51 {"reiserfs", 0x724573496552ULL, 6, 65588, 65620, 16, 65536},
52 {"romfs", 0x2d6d6f72, 4, 0, 0,0,0},
53 {"squashfs", 0x73717368, 4, 0, 0,0,0},
54 {"xiafs", 0x012fd16d, 4, 572, 0,0,0},
55 {"xfs", 0x42534658, 4, 0, 32, 12, 108},
56 {"vfat", 0x3233544146ULL, 5, 82, 67+(4<<24), 11, 71}, // fat32
57 {"vfat", 0x31544146, 4, 54, 39+(4<<24), 11, 43} // fat1
60 static void do_blkid(int fd, char *name)
70 // Read next block of data
71 len = readall(fd, toybuf, sizeof(toybuf));
72 if (len != sizeof(toybuf)) return;
74 // Iterate through types in range
75 for (i=0; i < sizeof(fstypes)/sizeof(struct fstype); i++) {
78 // Skip tests not in this 4k block
79 if (fstypes[i].magic_offset > off+sizeof(toybuf)) {
83 if (fstypes[i].magic_offset < off) continue;
85 // Populate 64 bit little endian magic value
87 for (j = 0; j < fstypes[i].magic_len; j++)
88 test += ((uint64_t)toybuf[j+fstypes[i].magic_offset-off])<<(8*j);
89 if (test == fstypes[i].magic) break;
92 if (i == ARRAY_LEN(fstypes)) {
100 // distinguish ext2/3/4
101 type = fstypes[i].name;
103 if (toybuf[1116]&4) type = "ext3";
104 if (toybuf[1120]&64) type = "ext4";
107 // Could special case NTFS here...
110 if (*toys.which->name == 'f') {
118 if (fstypes[i].label_len)
119 printf(" LABEL=\"%.*s\"", fstypes[i].label_len,
120 toybuf+fstypes[i].label_off-off);
122 if (fstypes[i].uuid_off) {
123 int bits = 0x550, size = fstypes[i].uuid_off >> 24,
124 uoff = (fstypes[i].uuid_off & ((1<<24)-1))-off;
126 if (size) bits = 4*(size == 4);
130 for (j = 0; j < size; j++) printf("-%02x"+!(bits & (1<<j)), toybuf[uoff+j]);
134 printf(" TYPE=\"%s\"\n", type);
137 void blkid_main(void)
139 if (*toys.optargs) loopfiles(toys.optargs, do_blkid);
141 unsigned int ma, mi, sz, fd;
142 char *name = toybuf, *buffer = toybuf+1024, device[32];
143 FILE *fp = xfopen("/proc/partitions", "r");
145 while (fgets(buffer, 1024, fp)) {
147 if (sscanf(buffer, " %u %u %u %[^\n ]", &ma, &mi, &sz, name) != 4)
150 sprintf(device, "/dev/%.20s", name);
151 if (-1 == (fd = open(device, O_RDONLY))) {
152 if (errno != ENOMEDIUM) perror_msg("%s", device);
154 do_blkid(fd, device);
158 if (CFG_TOYBOX_FREE) fclose(fp);
162 void fstype_main(void)
164 loopfiles(toys.optargs, do_blkid);