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Subject[PATCH 09/10] ext3: 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 EXT3FS_DEBUG.

This also fixes printk format warning that only reveals with EXT3FS_DEBUG.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: linux-ext4@vger.kernel.org
---
fs/ext3/Makefile | 2 +-
fs/ext3/balloc.c | 5 +++--
fs/ext3/bitmap.c | 30 ------------------------------
fs/ext3/ext3.h | 2 --
fs/ext3/ialloc.c | 4 +++-
5 files changed, 7 insertions(+), 36 deletions(-)
delete mode 100644 fs/ext3/bitmap.c

diff --git a/fs/ext3/Makefile b/fs/ext3/Makefile
index e77766a..ce93e94 100644
--- a/fs/ext3/Makefile
+++ b/fs/ext3/Makefile
@@ -4,7 +4,7 @@

obj-$(CONFIG_EXT3_FS) += ext3.o

-ext3-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
+ext3-y := balloc.o dir.o file.o fsync.o ialloc.o inode.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o ext3_jbd.o

ext3-$(CONFIG_EXT3_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index baac1b1..676bd53 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -1804,7 +1804,8 @@ ext3_fsblk_t ext3_count_free_blocks(struct super_block *sb)
if (bitmap_bh == NULL)
continue;

- x = ext3_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(gdp->bg_free_blocks_count), x);
bitmap_count += x;
@@ -1812,7 +1813,7 @@ ext3_fsblk_t ext3_count_free_blocks(struct super_block *sb)
brelse(bitmap_bh);
printk("ext3_count_free_blocks: stored = "E3FSBLK
", computed = "E3FSBLK", "E3FSBLK"\n",
- le32_to_cpu(es->s_free_blocks_count),
+ (ext3_fsblk_t)le32_to_cpu(es->s_free_blocks_count),
desc_count, bitmap_count);
return bitmap_count;
#else
diff --git a/fs/ext3/bitmap.c b/fs/ext3/bitmap.c
deleted file mode 100644
index 909d13e..0000000
--- a/fs/ext3/bitmap.c
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * linux/fs/ext3/bitmap.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- */
-
-#include "ext3.h"
-
-#ifdef EXT3FS_DEBUG
-
-static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
-
-unsigned long ext3_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 /* EXT3FS_DEBUG */
-
diff --git a/fs/ext3/ext3.h b/fs/ext3/ext3.h
index b6515fd..5c6246d 100644
--- a/fs/ext3/ext3.h
+++ b/fs/ext3/ext3.h
@@ -1029,8 +1029,6 @@ extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
extern unsigned long ext3_count_free_inodes (struct super_block *);
extern unsigned long ext3_count_dirs (struct super_block *);
extern void ext3_check_inodes_bitmap (struct super_block *);
-extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
-

/* inode.c */
int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
diff --git a/fs/ext3/ialloc.c b/fs/ext3/ialloc.c
index e3c39e4..b58c8e2 100644
--- a/fs/ext3/ialloc.c
+++ b/fs/ext3/ialloc.c
@@ -683,7 +683,9 @@ unsigned long ext3_count_free_inodes (struct super_block * sb)
if (!bitmap_bh)
continue;

- x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8);
+ x = EXT3_INODES_PER_GROUP(sb) / 8 * BITS_PER_BYTE -
+ memweight(bitmap_bh->b_data,
+ EXT3_INODES_PER_GROUP(sb) / 8);
printk("group %d: stored = %d, counted = %lu\n",
i, le16_to_cpu(gdp->bg_free_inodes_count), x);
bitmap_count += x;
--
1.7.7.6


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