On Fri, Aug 19, 2011 at 02:02:00PM -0400, Josh Boyer wrote:
> -unsigned long minix_count_free_blocks(struct minix_sb_info *sbi)
> +unsigned long minix_count_free_blocks(struct super_block *sb)
> {
> - return (count_free(sbi->s_zmap, sbi->s_zmap_blocks,
> - sbi->s_nzones - sbi->s_firstdatazone + 1)
> + struct minix_sb_info *sbi = minix_sb(sb);
> + u32 bits = sbi->s_nzones - (sbi->s_firstdatazone + 1);
> + unsigned blocks = minix_blocks_needed(bits, sb->s_blocksize);
> +
> + return (count_free(sbi->s_zmap, blocks, bits)
> << sbi->s_log_zone_size);
> }
> + unsigned blocks = minix_blocks_needed(bits, sb->s_blocksize);
> +
> + return count_free(sbi->s_imap, blocks, bits);
I'd pass sb->s_blocksize to that sucker instead of blocks; less redundancy
and we have good uses for it there anyway.
> +static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
> +{
> + unsigned blocks = bits / (blocksize * 8);
> +
> + if (bits % (blocksize * 8))
> + blocks++;
> + return blocks;
> +}
Yecchh... The usual idiom for that is DIV_ROUND_UP(bits, blocksize * 8)
(see linux/kernel.h for details).
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