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Date:	Mon, 20 Feb 2012 18:24:21 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: remove EXT4_MB_{BITMAP,BUDDY} macros

On 2/20/12 4:58 PM, Theodore Ts'o wrote:
> The EXT4_MB_BITMAP and EXT4_MB_BUDDY macros obfuscate more than they
> provide any abstraction.   So remove them.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>

Yeah, I like that.

Reviewed-by: Eric Sandeen <sandeen@...hat.com>

> ---
>  fs/ext4/mballoc.c |   32 ++++++++++++++++----------------
>  fs/ext4/mballoc.h |    2 --
>  2 files changed, 16 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 8e01214..7e6fab9 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -427,7 +427,7 @@ static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
>  {
>  	char *bb;
>  
> -	BUG_ON(EXT4_MB_BITMAP(e4b) == EXT4_MB_BUDDY(e4b));
> +	BUG_ON(e4b->bd_bitmap == e4b->bd_buddy);
>  	BUG_ON(max == NULL);
>  
>  	if (order > e4b->bd_blkbits + 1) {
> @@ -438,10 +438,10 @@ static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
>  	/* at order 0 we see each particular block */
>  	if (order == 0) {
>  		*max = 1 << (e4b->bd_blkbits + 3);
> -		return EXT4_MB_BITMAP(e4b);
> +		return e4b->bd_bitmap;
>  	}
>  
> -	bb = EXT4_MB_BUDDY(e4b) + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order];
> +	bb = e4b->bd_buddy + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order];
>  	*max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order];
>  
>  	return bb;
> @@ -590,7 +590,7 @@ static int __mb_check_buddy(struct ext4_buddy *e4b, char *file,
>  			for (j = 0; j < (1 << order); j++) {
>  				k = (i * (1 << order)) + j;
>  				MB_CHECK_ASSERT(
> -					!mb_test_bit(k, EXT4_MB_BITMAP(e4b)));
> +					!mb_test_bit(k, e4b->bd_bitmap));
>  			}
>  			count++;
>  		}
> @@ -1203,10 +1203,10 @@ static int mb_find_order_for_block(struct ext4_buddy *e4b, int block)
>  	int order = 1;
>  	void *bb;
>  
> -	BUG_ON(EXT4_MB_BITMAP(e4b) == EXT4_MB_BUDDY(e4b));
> +	BUG_ON(e4b->bd_bitmap == e4b->bd_buddy);
>  	BUG_ON(block >= (1 << (e4b->bd_blkbits + 3)));
>  
> -	bb = EXT4_MB_BUDDY(e4b);
> +	bb = e4b->bd_buddy;
>  	while (order <= e4b->bd_blkbits + 1) {
>  		block = block >> 1;
>  		if (!mb_test_bit(block, bb)) {
> @@ -1276,9 +1276,9 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
>  
>  	/* let's maintain fragments counter */
>  	if (first != 0)
> -		block = !mb_test_bit(first - 1, EXT4_MB_BITMAP(e4b));
> +		block = !mb_test_bit(first - 1, e4b->bd_bitmap);
>  	if (first + count < EXT4_SB(sb)->s_mb_maxs[0])
> -		max = !mb_test_bit(first + count, EXT4_MB_BITMAP(e4b));
> +		max = !mb_test_bit(first + count, e4b->bd_bitmap);
>  	if (block && max)
>  		e4b->bd_info->bb_fragments--;
>  	else if (!block && !max)
> @@ -1289,7 +1289,7 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
>  		block = first++;
>  		order = 0;
>  
> -		if (!mb_test_bit(block, EXT4_MB_BITMAP(e4b))) {
> +		if (!mb_test_bit(block, e4b->bd_bitmap)) {
>  			ext4_fsblk_t blocknr;
>  
>  			blocknr = ext4_group_first_block_no(sb, e4b->bd_group);
> @@ -1300,7 +1300,7 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
>  					      "freeing already freed block "
>  					      "(bit %u)", block);
>  		}
> -		mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
> +		mb_clear_bit(block, e4b->bd_bitmap);
>  		e4b->bd_info->bb_counters[order]++;
>  
>  		/* start of the buddy */
> @@ -1382,7 +1382,7 @@ static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
>  			break;
>  
>  		next = (block + 1) * (1 << order);
> -		if (mb_test_bit(next, EXT4_MB_BITMAP(e4b)))
> +		if (mb_test_bit(next, e4b->bd_bitmap))
>  			break;
>  
>  		order = mb_find_order_for_block(e4b, next);
> @@ -1419,9 +1419,9 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex)
>  
>  	/* let's maintain fragments counter */
>  	if (start != 0)
> -		mlen = !mb_test_bit(start - 1, EXT4_MB_BITMAP(e4b));
> +		mlen = !mb_test_bit(start - 1, e4b->bd_bitmap);
>  	if (start + len < EXT4_SB(e4b->bd_sb)->s_mb_maxs[0])
> -		max = !mb_test_bit(start + len, EXT4_MB_BITMAP(e4b));
> +		max = !mb_test_bit(start + len, e4b->bd_bitmap);
>  	if (mlen && max)
>  		e4b->bd_info->bb_fragments++;
>  	else if (!mlen && !max)
> @@ -1464,7 +1464,7 @@ static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex)
>  	}
>  	mb_set_largest_free_order(e4b->bd_sb, e4b->bd_info);
>  
> -	ext4_set_bits(EXT4_MB_BITMAP(e4b), ex->fe_start, len0);
> +	ext4_set_bits(e4b->bd_bitmap, ex->fe_start, len0);
>  	mb_check_buddy(e4b);
>  
>  	return ret;
> @@ -1763,7 +1763,7 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
>  					struct ext4_buddy *e4b)
>  {
>  	struct super_block *sb = ac->ac_sb;
> -	void *bitmap = EXT4_MB_BITMAP(e4b);
> +	void *bitmap = e4b->bd_bitmap;
>  	struct ext4_free_extent ex;
>  	int i;
>  	int free;
> @@ -1823,7 +1823,7 @@ void ext4_mb_scan_aligned(struct ext4_allocation_context *ac,
>  {
>  	struct super_block *sb = ac->ac_sb;
>  	struct ext4_sb_info *sbi = EXT4_SB(sb);
> -	void *bitmap = EXT4_MB_BITMAP(e4b);
> +	void *bitmap = e4b->bd_bitmap;
>  	struct ext4_free_extent ex;
>  	ext4_fsblk_t first_group_block;
>  	ext4_fsblk_t a;
> diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
> index 7128f46..c070618 100644
> --- a/fs/ext4/mballoc.h
> +++ b/fs/ext4/mballoc.h
> @@ -212,8 +212,6 @@ struct ext4_buddy {
>  	__u16 bd_blkbits;
>  	ext4_group_t bd_group;
>  };
> -#define EXT4_MB_BITMAP(e4b)	((e4b)->bd_bitmap)
> -#define EXT4_MB_BUDDY(e4b)	((e4b)->bd_buddy)
>  
>  static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
>  					struct ext4_free_extent *fex)

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