56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* This function performs three tasks:
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- Make sectors disk relative from partition relative.
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- Normalize offset to be less than the sector size.
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- Verify that the range is inside the partition. */
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static grub_err_t
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grub_disk_adjust_range (grub_disk_t disk, grub_disk_addr_t *sector,
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grub_off_t *offset, grub_size_t size)
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{
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grub_partition_t part;
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*sector += *offset >> GRUB_DISK_SECTOR_BITS;
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*offset &= GRUB_DISK_SECTOR_SIZE - 1;
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for (part = disk->partition; part; part = part->parent)
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{
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grub_disk_addr_t start;
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grub_uint64_t len;
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start = part->start;
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len = part->len;
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if (*sector >= len
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|| len - *sector < ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
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>> GRUB_DISK_SECTOR_BITS))
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return grub_error (GRUB_ERR_OUT_OF_RANGE,
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N_("attempt to read or write outside of partition"));
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*sector += start;
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}
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if (disk->total_sectors != GRUB_DISK_SIZE_UNKNOWN
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&& ((disk->total_sectors << (disk->log_sector_size - GRUB_DISK_SECTOR_BITS)) <= *sector
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|| ((*offset + size + GRUB_DISK_SECTOR_SIZE - 1)
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>> GRUB_DISK_SECTOR_BITS) > (disk->total_sectors
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<< (disk->log_sector_size
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- GRUB_DISK_SECTOR_BITS)) - *sector))
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return grub_error (GRUB_ERR_OUT_OF_RANGE,
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N_("attempt to read or write outside of disk `%s'"), disk->name);
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return GRUB_ERR_NONE;
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}
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static inline grub_disk_addr_t
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transform_sector (grub_disk_t disk, grub_disk_addr_t sector)
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{
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return sector >> (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
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}
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static unsigned
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grub_disk_cache_get_index (unsigned long dev_id, unsigned long disk_id,
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grub_disk_addr_t sector)
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{
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return ((dev_id * 524287UL + disk_id * 2606459UL
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+ ((unsigned) (sector >> GRUB_DISK_CACHE_BITS)))
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% GRUB_DISK_CACHE_NUM);
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}
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