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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [partitions/] [atari.c] - Rev 1765
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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/fs.h> #include <linux/genhd.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/string.h> #include <linux/blk.h> #include <linux/ctype.h> #include <asm/byteorder.h> #include <asm/system.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 gendisk *hd, struct block_device *bdev, unsigned long first_sector, int minor) { int m_lim = minor + hd->max_p; Sector sect; struct rootsector *rs; struct partition_info *pi; u32 extensect; u32 hd_size; #ifdef ICD_PARTS int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */ #endif rs = (struct rootsector *) read_dev_sector(bdev, 0, §); if (!rs) return -1; /* Verify this is an Atari rootsector: */ hd_size = hd->part[minor - 1].nr_sects; 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]; printk (" AHDI"); for (; pi < &rs->part[4] && minor < m_lim; minor++, 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 */ add_gd_partition (hd, minor, be32_to_cpu(pi->st), be32_to_cpu(pi->siz)); continue; } /* extension partition */ #ifdef ICD_PARTS part_fmt = 1; #endif printk(" XGM<"); partsect = extensect = be32_to_cpu(pi->st); while (1) { xrs = (struct rootsector *)read_dev_sector(bdev, partsect, §2); if (!xrs) { printk (" block %ld read failed\n", partsect); put_dev_sector(sect); return 0; } /* ++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; } add_gd_partition(hd, minor, 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); minor++; if (minor >= m_lim) { printk( "\nMaximum number of partitions reached!\n" ); break; } } printk(" >"); } #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)) { printk(" ICD<"); for (; pi < &rs->icdpart[8] && minor < m_lim; minor++, pi++) { /* accept only GEM,BGM,RAW,LNX,SWP partitions */ if (!((pi->flg & 1) && OK_id(pi->id))) continue; part_fmt = 2; add_gd_partition (hd, minor, be32_to_cpu(pi->st), be32_to_cpu(pi->siz)); } printk(" >"); } } #endif put_dev_sector(sect); printk ("\n"); return 1; }