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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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