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fs/partitions/atari.c
3.92 KB
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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 ; } |
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int atari_partition(struct parsed_partitions *state) |
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{ 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 |
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rs = read_part_sector(state, 0, §); |
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if (!rs) return -1; /* Verify this is an Atari rootsector: */ |
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hd_size = state->bdev->bd_inode->i_size >> 9; |
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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]; |
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strlcat(state->pp_buf, " AHDI", PAGE_SIZE); |
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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 |
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strlcat(state->pp_buf, " XGM<", PAGE_SIZE); |
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partsect = extensect = be32_to_cpu(pi->st); while (1) { |
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xrs = read_part_sector(state, partsect, §2); |
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if (!xrs) { printk (" block %ld read failed ", partsect); put_dev_sector(sect); |
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return -1; |
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} /* ++roman: sanity check: bit 0 of flg field must be set */ if (!(xrs->part[0].flg & 1)) { printk( " First sub-partition in extended partition is not valid! " ); 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(" ID of extended partition is not XGM! "); put_dev_sector(sect2); break; } partsect = be32_to_cpu(xrs->part[1].st) + extensect; put_dev_sector(sect2); if (++slot == state->limit) { printk( " Maximum number of partitions reached! " ); break; } } |
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strlcat(state->pp_buf, " >", PAGE_SIZE); |
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} #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)) { |
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strlcat(state->pp_buf, " ICD<", PAGE_SIZE); |
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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)); } |
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strlcat(state->pp_buf, " >", PAGE_SIZE); |
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} } #endif put_dev_sector(sect); |
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strlcat(state->pp_buf, " ", PAGE_SIZE); |
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return 1; } |