Lines Matching refs:fsinfo
56 u_char fsinfo[2 * DOSBOOTBLOCKSIZE];
106 boot->FSInfo = block[48] + (block[49] << 8);
116 if ((boot->FSInfo == 0) ||
128 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
129 != boot->FSInfo * boot->BytesPerSec
130 || read(dosfs, fsinfo, sizeof fsinfo)
131 != sizeof fsinfo) {
132 perror("could not read fsinfo block");
135 if (memcmp(fsinfo, "RRaA", 4)
136 || memcmp(fsinfo + 0x1e4, "rrAa", 4)
137 || fsinfo[0x1fc]
138 || fsinfo[0x1fd]
139 || fsinfo[0x1fe] != 0x55
140 || fsinfo[0x1ff] != 0xaa
141 || fsinfo[0x3fc]
142 || fsinfo[0x3fd]
143 || fsinfo[0x3fe] != 0x55
144 || fsinfo[0x3ff] != 0xaa) {
145 pwarn("Invalid signature in fsinfo block\n");
147 memcpy(fsinfo, "RRaA", 4);
148 memcpy(fsinfo + 0x1e4, "rrAa", 4);
149 fsinfo[0x1fc] = fsinfo[0x1fd] = 0;
150 fsinfo[0x1fe] = 0x55;
151 fsinfo[0x1ff] = 0xaa;
152 fsinfo[0x3fc] = fsinfo[0x3fd] = 0;
153 fsinfo[0x3fe] = 0x55;
154 fsinfo[0x3ff] = 0xaa;
155 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
156 != boot->FSInfo * boot->BytesPerSec
157 || write(dosfs, fsinfo, sizeof fsinfo)
158 != sizeof fsinfo) {
159 perror("Unable to write FSInfo");
164 boot->FSInfo = 0;
166 if (boot->FSInfo) {
167 boot->FSFree = fsinfo[0x1e8] + (fsinfo[0x1e9] << 8)
168 + (fsinfo[0x1ea] << 16)
169 + (fsinfo[0x1eb] << 24);
170 boot->FSNext = fsinfo[0x1ec] + (fsinfo[0x1ed] << 8)
171 + (fsinfo[0x1ee] << 16)
172 + (fsinfo[0x1ef] << 24);
212 /* Check backup FSInfo? XXX */
287 u_char fsinfo[2 * DOSBOOTBLOCKSIZE];
289 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
290 != boot->FSInfo * boot->BytesPerSec
291 || read(dosfs, fsinfo, sizeof fsinfo) != sizeof fsinfo) {
292 perror("could not read fsinfo block");
295 fsinfo[0x1e8] = (u_char)boot->FSFree;
296 fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);
297 fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);
298 fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);
299 fsinfo[0x1ec] = (u_char)boot->FSNext;
300 fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);
301 fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);
302 fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);
303 if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
304 != boot->FSInfo * boot->BytesPerSec
305 || write(dosfs, fsinfo, sizeof fsinfo)
306 != sizeof fsinfo) {
307 perror("Unable to write FSInfo");
314 * support for FAT32) doesn't maintain the FSINFO block
317 * Therefor, we handle the FSINFO block only informally,
