/* *  fs/partitions/atari.c * *  Code extracted from drivers/block/genhd.c * *  Copyright (C) 1991-1998  Linus Torvalds *  Re-organised Feb 1998 Russell King */ #include <linux/ctype.h>#include "check.h"#include "atari.h" /* ++guenther: this should be settable by the user ("make config")?. */#define ICD_PARTS /* check if a partition entry looks valid -- Atari format is assumed if at   least one of the primary entries is ok this way */#define	VALID_PARTITION(pi,hdsiz)					     \    (((pi)->flg & 1) &&							     \     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \     be32_to_cpu((pi)->st) <= (hdsiz) &&				     \     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz)) static inline int OK_id(char *s){	return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||		memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||		memcmp (s, "RAW", 3) == 0 ;} int atari_partition(struct parsed_partitions *state){	Sector sect;	struct rootsector *rs;	struct partition_info *pi;	u32 extensect;	u32 hd_size;	int slot;#ifdef ICD_PARTS	int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */#endif 	rs = read_part_sector(state, 0, &sect);	if (!rs)		return -1; 	/* Verify this is an Atari rootsector: */	hd_size = state->bdev->bd_inode->i_size >> 9;	if (!VALID_PARTITION(&rs->part[0], hd_size) &&	    !VALID_PARTITION(&rs->part[1], hd_size) &&	    !VALID_PARTITION(&rs->part[2], hd_size) &&	    !VALID_PARTITION(&rs->part[3], hd_size)) {		/*		 * if there's no valid primary partition, assume that no Atari		 * format partition table (there's no reliable magic or the like	         * :-()		 */		put_dev_sector(sect);		return 0;	} 	pi = &rs->part[0];	strlcat(state->pp_buf, " AHDI", PAGE_SIZE);	for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {		struct rootsector *xrs;		Sector sect2;		ulong partsect; 		if ( !(pi->flg & 1) )			continue;		/* active partition */		if (memcmp (pi->id, "XGM", 3) != 0) {			/* we don't care about other id's */			put_partition (state, slot, be32_to_cpu(pi->st),					be32_to_cpu(pi->siz));			continue;		}		/* extension partition */#ifdef ICD_PARTS		part_fmt = 1;#endif		strlcat(state->pp_buf, " XGM<", PAGE_SIZE);		partsect = extensect = be32_to_cpu(pi->st);		while (1) {			xrs = read_part_sector(state, partsect, &sect2);			if (!xrs) {				printk (" block %ld read failed\n", partsect);				put_dev_sector(sect);				return -1;			} 			/* ++roman: sanity check: bit 0 of flg field must be set */			if (!(xrs->part[0].flg & 1)) {				printk( "\nFirst sub-partition in extended partition is not valid!\n" );				put_dev_sector(sect2);				break;			} 			put_partition(state, slot,				   partsect + be32_to_cpu(xrs->part[0].st),				   be32_to_cpu(xrs->part[0].siz)); 			if (!(xrs->part[1].flg & 1)) {				/* end of linked partition list */				put_dev_sector(sect2);				break;			}			if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {				printk("\nID of extended partition is not XGM!\n");				put_dev_sector(sect2);				break;			} 			partsect = be32_to_cpu(xrs->part[1].st) + extensect;			put_dev_sector(sect2);			if (++slot == state->limit) {				printk( "\nMaximum number of partitions reached!\n" );				break;			}		}		strlcat(state->pp_buf, " >", PAGE_SIZE);	}#ifdef ICD_PARTS	if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */		pi = &rs->icdpart[0];		/* sanity check: no ICD format if first partition invalid */		if (OK_id(pi->id)) {			strlcat(state->pp_buf, " ICD<", PAGE_SIZE);			for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {				/* accept only GEM,BGM,RAW,LNX,SWP partitions */				if (!((pi->flg & 1) && OK_id(pi->id)))					continue;				part_fmt = 2;				put_partition (state, slot,						be32_to_cpu(pi->st),						be32_to_cpu(pi->siz));			}			strlcat(state->pp_buf, " >", PAGE_SIZE);		}	}#endif	put_dev_sector(sect); 	strlcat(state->pp_buf, "\n", PAGE_SIZE); 	return 1;}