fs/pcfs/pc_alloc.c

44 static pc_cluster32_t pc_getcluster(struct pcfs *fsp, pc_cluster32_t cn);
61 	pc_cluster32_t cn, ncn;		/* current, next cluster number */
112 		cn = ncn;
113 		if (!pc_validcl(fsp, cn)) {
114 			if (IS_FAT32(fsp) && cn >= PCF_LASTCLUSTER32 &&
119 			    cn >= PCF_LASTCLUSTER &&
125 				    "pc_bmap: badfs cn=%d\n", cn);
130 		ncn = pc_getcluster(fsp, cn);
139 	pcp->pc_lcluster = cn;
140 	*dbnp = pc_cldaddr(fsp, cn);
145 		while ((cn + 1) == ncn && count < *contigbp &&
148 			cn = ncn;
169 	pc_cluster32_t cn;	/* current cluster number */
196 		switch (cn = pc_alloccluster(fsp, 1)) {
202 		pcp->pc_scluster = cn;
204 		cn = pcp->pc_scluster;
205 		if (IS_FAT32(fsp) && cn == 0)
206 			cn = fsp->pcfs_rdirstart;
207 		if (!pc_validcl(fsp, cn)) {
208 			PC_DPRINTF1(1, "pc_balloc: badfs cn=%d\n", cn);
216 		cn = pcp->pc_lcluster;
219 		ncn = pc_getcluster(fsp, cn);
231 			pc_setcluster(fsp, cn, ncn);
238 		cn = ncn;
245 	*dbnp = pc_cldaddr(fsp, cn);
257 	pc_cluster32_t cn;
281 	cn = pcp->pc_scluster;
282 	if (IS_FAT32(fsp) && cn == 0)
283 		cn = fsp->pcfs_rdirstart;
296 		if (!pc_validcl(fsp, cn)) {
297 			PC_DPRINTF1(1, "pc_bfree: badfs cn=%d\n", cn);
301 		ncn = pc_getcluster(fsp, cn);
303 			pc_setcluster(fsp, cn, PCF_FREECLUSTER);
308 					pc_setcluster(fsp, cn,
311 					pc_setcluster(fsp, cn,
321 		cn = ncn;
332 	pc_cluster32_t cn;
342 	for (cn = PCF_FIRSTCLUSTER; pc_validcl(fsp, cn); cn++) {
343 		if (pc_getcluster(fsp, cn) == PCF_FREECLUSTER) {
362  *	cn = current cluster number in chain
365 pc_getcluster(struct pcfs *fsp, pc_cluster32_t cn)
369 	if (fsp->pcfs_fatp == (uchar_t *)0 || !pc_validcl(fsp, cn))
374 		fp = fsp->pcfs_fatp + (cn << 2);
375 		cn = ltohi(*(pc_cluster32_t *)fp);
378 		fp = fsp->pcfs_fatp + (cn << 1);
379 		cn = ltohs(*(pc_cluster16_t *)fp);
382 		fp = fsp->pcfs_fatp + (cn + (cn >> 1));
383 		if (cn & 01) {
384 			cn = (((unsigned int)*fp++ & 0xf0) >> 4);
385 			cn += (*fp << 4);
387 			cn = *fp++;
388 			cn += ((*fp & 0x0f) << 8);
390 		if (cn >= PCF_12BCLUSTER)
391 			cn |= PCF_RESCLUSTER;
395 		cn = PCF_ERRORCLUSTER;
397 	return (cn);
402  *	cn = cluster number to be set in FAT
406 pc_setcluster(struct pcfs *fsp, pc_cluster32_t cn, pc_cluster32_t ncn)
411 	if (fsp->pcfs_fatp == (uchar_t *)0 || !pc_validcl(fsp, cn))
414 	pc_mark_fat_updated(fsp, cn);
417 		fp = fsp->pcfs_fatp + (cn << 2);
421 		fp = fsp->pcfs_fatp + (cn << 1);
426 		fp = fsp->pcfs_fatp + (cn + (cn >> 1));
427 		if (cn & 01) {
457 	pc_cluster32_t cn;
463 	for (cn = fsp->pcfs_nxfrecls; pc_validcl(fsp, cn); cn++) {
464 		if (pc_getcluster(fsp, cn) == PCF_FREECLUSTER) {
468 				pc_setcluster(fsp, cn, PCF_LASTCLUSTERMARK32);
473 				pc_setcluster(fsp, cn, PCF_LASTCLUSTERMARK);
481 				bp->b_blkno = pc_cldaddr(fsp, cn);
491 			fsp->pcfs_nxfrecls = cn + 1;
492 			return (cn);