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Subject[PATCH v2 10/10] ext4: use memweight()
Date
Use memweight() to count the total number of bits clear in memory area.
This change only affects the code segments enabled by EXT4FS_DEBUG.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: linux-ext4@vger.kernel.org
---
v2: don't remove bitmap.c which now has other than ext4_count_free()

fs/ext4/balloc.c | 3 ++-
fs/ext4/bitmap.c | 18 ------------------
fs/ext4/ext4.h | 1 -
fs/ext4/ialloc.c | 4 +++-
4 files changed, 5 insertions(+), 21 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 99b6324..e5eadfe 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -609,7 +609,8 @@ ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
if (bitmap_bh == NULL)
continue;

- x = ext4_count_free(bitmap_bh, sb->s_blocksize);
+ x = sb->s_blocksize * BITS_PER_BYTE -
+ memweight(bitmap_bh->b_data, sb->s_blocksize);
printk(KERN_DEBUG "group %u: stored = %d, counted = %u\n",
i, ext4_free_group_clusters(sb, gdp), x);
bitmap_count += x;
diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index b319721..3c67c97 100644
--- a/fs/ext4/bitmap.c
+++ b/fs/ext4/bitmap.c
@@ -11,24 +11,6 @@
#include <linux/jbd2.h>
#include "ext4.h"

-#ifdef EXT4FS_DEBUG
-
-static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
-
-unsigned int ext4_count_free(struct buffer_head *map, unsigned int numchars)
-{
- unsigned int i, sum = 0;
-
- if (!map)
- return 0;
- for (i = 0; i < numchars; i++)
- sum += nibblemap[map->b_data[i] & 0xf] +
- nibblemap[(map->b_data[i] >> 4) & 0xf];
- return sum;
-}
-
-#endif /* EXT4FS_DEBUG */
-
int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *gdp,
struct buffer_head *bh, int sz)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index cfc4e01..3a3511d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1852,7 +1852,6 @@ struct mmpd_data {
# define NORET_AND noreturn,

/* bitmap.c */
-extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *gdp,
struct buffer_head *bh, int sz);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index d48e8b1..1310108 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1054,7 +1054,9 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
if (!bitmap_bh)
continue;

- x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8);
+ x = EXT4_INODES_PER_GROUP(sb) / 8 * BITS_PER_BYTE -
+ memweight(bitmap_bh->b_data,
+ EXT4_INODES_PER_GROUP(sb) / 8);
printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
(unsigned long) i, ext4_free_inodes_count(sb, gdp), x);
bitmap_count += x;
--
1.7.7.6


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