litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

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/*
 *  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;


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