From: Akinobu Mita <akinobu.mita@gmail.com>
To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Cc: Akinobu Mita <akinobu.mita@gmail.com>,
"Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
linux-ext4@vger.kernel.org
Subject: [PATCH 10/10] ext4: use memweight()
Date: Sun, 20 May 2012 22:23:23 +0900 [thread overview]
Message-ID: <1337520203-29147-10-git-send-email-akinobu.mita@gmail.com> (raw)
In-Reply-To: <1337520203-29147-1-git-send-email-akinobu.mita@gmail.com>
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
---
fs/ext4/Makefile | 2 +-
fs/ext4/balloc.c | 3 ++-
fs/ext4/bitmap.c | 31 -------------------------------
fs/ext4/ext4.h | 3 ---
fs/ext4/ialloc.c | 4 +++-
5 files changed, 6 insertions(+), 37 deletions(-)
delete mode 100644 fs/ext4/bitmap.c
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index 56fd8f86..0caff90 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -4,7 +4,7 @@
obj-$(CONFIG_EXT4_FS) += ext4.o
-ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
+ext4-y := balloc.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o block_validity.o move_extent.o \
mmp.o indirect.o
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 4bbd07a..57e3bfb 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -584,7 +584,8 @@ 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
deleted file mode 100644
index fa3af81..0000000
--- a/fs/ext4/bitmap.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * linux/fs/ext4/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 <linux/buffer_head.h>
-#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 */
-
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 0e01e90..9c616d9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1782,9 +1782,6 @@ struct mmpd_data {
# define ATTRIB_NORET __attribute__((noreturn))
# define NORET_AND noreturn,
-/* bitmap.c */
-extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
-
/* balloc.c */
extern unsigned int ext4_block_group(struct super_block *sb,
ext4_fsblk_t blocknr);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 409c2ee..2452bb7 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1011,7 +1011,9 @@ 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
next prev parent reply other threads:[~2012-05-20 13:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-20 13:23 [PATCH 01/10] string: introduce memweight Akinobu Mita
2012-05-20 13:23 ` [PATCH 02/10] minixfs: use memweight() Akinobu Mita
2012-05-20 13:23 ` [PATCH 03/10] qnx4fs: " Akinobu Mita
2012-05-20 15:34 ` Anders Larsen
2012-05-21 11:59 ` Akinobu Mita
2012-05-20 13:23 ` [PATCH 04/10] dm-log: " Akinobu Mita
2012-05-20 13:23 ` [PATCH 05/10] affs: " Akinobu Mita
2012-05-20 13:23 ` [PATCH 06/10] video/uvc: " Akinobu Mita
2012-05-20 20:46 ` Laurent Pinchart
2012-05-21 12:03 ` Akinobu Mita
2012-05-21 12:18 ` Laurent Pinchart
2012-05-20 13:23 ` [PATCH 07/10] ocfs2: " Akinobu Mita
2012-05-20 13:23 ` [PATCH 08/10] ext2: " Akinobu Mita
2012-05-20 13:23 ` [PATCH 09/10] ext3: " Akinobu Mita
2012-05-20 13:23 ` Akinobu Mita [this message]
2012-05-23 9:21 ` [PATCH 01/10] string: introduce memweight Jan Kara
2012-05-23 12:12 ` Akinobu Mita
2012-05-23 12:29 ` Jan Kara
2012-05-23 13:16 ` Matthew Wilcox
2012-05-24 11:54 ` Akinobu Mita
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