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Subject[PATCH 08/10] ext2: 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 EXT2FS_DEBUG.

This also fixes printk format warning that only reveals with EXT2FS_DEBUG.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org
---
fs/ext2/balloc.c | 22 ++--------------------
fs/ext2/ext2.h | 1 -
fs/ext2/ialloc.c | 5 ++++-
3 files changed, 6 insertions(+), 22 deletions(-)
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index a8cbe1b..3351731 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1443,25 +1443,6 @@ ext2_fsblk_t ext2_new_block(struct inode *inode, unsigned long goal, int *errp)
return ext2_new_blocks(inode, goal, &count, errp);
}

-#ifdef EXT2FS_DEBUG
-
-static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
-
-unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
-{
- unsigned int i;
- unsigned long 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 /* EXT2FS_DEBUG */
-
unsigned long ext2_count_free_blocks (struct super_block * sb)
{
struct ext2_group_desc * desc;
@@ -1485,7 +1466,8 @@ unsigned long ext2_count_free_blocks (struct super_block * sb)
if (!bitmap_bh)
continue;

- x = ext2_count_free(bitmap_bh, sb->s_blocksize);
+ x = sb->s_blocksize * BITS_PER_BYTE -
+ memweight(bitmap_bh->b_data, sb->s_blocksize);
printk ("group %d: stored = %d, counted = %lu\n",
i, le16_to_cpu(desc->bg_free_blocks_count), x);
bitmap_count += x;
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 0b2b4db..de2a4e5 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -745,7 +745,6 @@ extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr
extern void ext2_free_inode (struct inode *);
extern unsigned long ext2_count_free_inodes (struct super_block *);
extern void ext2_check_inodes_bitmap (struct super_block *);
-extern unsigned long ext2_count_free (struct buffer_head *, unsigned);

/* inode.c */
extern struct inode *ext2_iget (struct super_block *, unsigned long);
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 8b15cf8..82139c4 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -639,13 +639,16 @@ unsigned long ext2_count_free_inodes (struct super_block * sb)
if (!bitmap_bh)
continue;

- x = ext2_count_free(bitmap_bh, EXT2_INODES_PER_GROUP(sb) / 8);
+ x = EXT2_INODES_PER_GROUP(sb) / 8 * BITS_PER_BYTE -
+ memweight(bitmap_bh->b_data,
+ EXT2_INODES_PER_GROUP(sb) / 8);
printk("group %d: stored = %d, counted = %u\n",
i, le16_to_cpu(desc->bg_free_inodes_count), x);
bitmap_count += x;
}
brelse(bitmap_bh);
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
+ (unsigned long)
percpu_counter_read(&EXT2_SB(sb)->s_freeinodes_counter),
desc_count, bitmap_count);
return desc_count;
--
1.7.7.6


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