Cross Reference: /src/sbin/fsck

Lines Matching refs:boot
30 __RCSID("$NetBSD: boot.c,v 1.27 2022/08/28 11:32:19 mlelstv Exp $");
46 readboot(int dosfs, struct bootblock *boot)
68 		perr("could not read boot block");
74 		pfatal("Invalid signature in boot block: %02x%02x", block[511], block[510]);
79 	memset(boot, 0, sizeof *boot);
80 	boot->ValidFat = -1;
83 	boot->BytesPerSec = block[11] + (block[12] << 8);
84 	boot->SecPerClust = block[13];
85 	if (boot->SecPerClust == 0 || popcount(boot->SecPerClust) != 1) {
86  		pfatal("Invalid cluster size: %u\n", boot->SecPerClust);
89 	boot->ResSectors = block[14] + (block[15] << 8);
90 	boot->FATs = block[16];
91 	if (boot->FATs == 0) {
92 		pfatal("Invalid number of FATs: %u\n", boot->FATs);
95 	boot->RootDirEnts = block[17] + (block[18] << 8);
96 	boot->Sectors = block[19] + (block[20] << 8);
97 	boot->Media = block[21];
98 	boot->FATsmall = block[22] + (block[23] << 8);
99 	boot->SecPerTrack = block[24] + (block[25] << 8);
100 	boot->Heads = block[26] + (block[27] << 8);
101 	boot->HiddenSecs = block[28] + (block[29] << 8) + (block[30] << 16) + ((uint32_t)block[31] << 24);
102 	boot->HugeSectors = block[32] + (block[33] << 8) + (block[34] << 16) + ((uint32_t)block[35] << 24);
104 	boot->FATsecs = boot->FATsmall;
113 	if (!boot->RootDirEnts)
114 		boot->flags |= FAT32;
115 	if (boot->flags & FAT32) {
116 		boot->FATsecs = block[36] + (block[37] << 8)
119 			boot->ValidFat = block[40] & 0x0f;
128 		boot->RootCl = block[44] + (block[45] << 8)
130 		boot->FSInfo = block[48] + (block[49] << 8);
131 		boot->Backup = block[50] + (block[51] << 8);
133 		if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
134 		    != boot->FSInfo * boot->BytesPerSec
160 				if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
161 				    != boot->FSInfo * boot->BytesPerSec
172 				boot->FSInfo = 0;
174 		if (boot->FSInfo) {
175 			boot->FSFree = fsinfo[0x1e8] + (fsinfo[0x1e9] << 8)
178 			boot->FSNext = fsinfo[0x1ec] + (fsinfo[0x1ed] << 8)
183 		if (lseek(dosfs, boot->Backup * boot->BytesPerSec, SEEK_SET)
184 		    != boot->Backup * boot->BytesPerSec
204 			        boot->Backup);
218 	if (boot->FATsecs == 0) {
219 		pfatal("Invalid number of FAT sectors: %u\n", boot->FATsecs);
223 	boot->FirstCluster = (boot->RootDirEnts * 32 + boot->BytesPerSec - 1)
224 	    / boot->BytesPerSec
225 	    + boot->ResSectors
226 	    + boot->FATs * boot->FATsecs;
228 	if (boot->BytesPerSec % DOSBOOTBLOCKSIZE != 0) {
229 		pfatal("Invalid sector size: %u", boot->BytesPerSec);
232 	if (boot->SecPerClust == 0) {
233 		pfatal("Invalid cluster size: %u", boot->SecPerClust);
236 	if (boot->Sectors) {
237 		boot->HugeSectors = 0;
238 		boot->NumSectors = boot->Sectors;
240 		boot->NumSectors = boot->HugeSectors;
242 	if (boot->FirstCluster + boot->SecPerClust > boot->NumSectors) {
244 		    boot->FirstCluster);
252 	boot->NumClusters =
253 	    (boot->NumSectors - boot->FirstCluster) / boot->SecPerClust;
255 	if (boot->flags&FAT32)
256 		boot->ClustMask = CLUST32_MASK;
257 	else if (boot->NumClusters < (CLUST_RSRVD&CLUST12_MASK))
258 		boot->ClustMask = CLUST12_MASK;
259 	else if (boot->NumClusters < (CLUST_RSRVD&CLUST16_MASK))
260 		boot->ClustMask = CLUST16_MASK;
263 		       boot->NumClusters);
267 	switch (boot->ClustMask) {
269 		boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 4;
272 		boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec) / 2;
275 		boot->NumFatEntries = (boot->FATsecs * boot->BytesPerSec * 2) / 3;
279 	if (boot->NumFatEntries < boot->NumClusters) {
281 		       boot->NumClusters, boot->FATsecs);
290 	boot->NumClusters += CLUST_FIRST;
292 	boot->ClusterSize = boot->BytesPerSec * boot->SecPerClust;
294 	boot->NumFiles = 1;
295 	boot->NumFree = 0;
301 writefsinfo(int dosfs, struct bootblock *boot)
305 	fsinfo = calloc(2, boot->BytesPerSec);
309 	if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
310 	    != boot->FSInfo * boot->BytesPerSec
311 	    || (size_t)read(dosfs, fsinfo, 2 * boot->BytesPerSec)
312 	    != 2 * boot->BytesPerSec) {
317 	fsinfo[0x1e8] = (u_char)boot->FSFree;
318 	fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);
319 	fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);
320 	fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);
321 	fsinfo[0x1ec] = (u_char)boot->FSNext;
322 	fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);
323 	fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);
324 	fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);
325 	if (lseek(dosfs, boot->FSInfo * boot->BytesPerSec, SEEK_SET)
326 	    != boot->FSInfo * boot->BytesPerSec
327 	    || (size_t)write(dosfs, fsinfo, 2 * boot->BytesPerSec)
328 	    != 2 * boot->BytesPerSec) {
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