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Commit 01b954a3 authored by Marcin Slusarz's avatar Marcin Slusarz Committed by Jan Kara
Browse files

udf: convert udf_count_free_bitmap to use bitmap_weight 



replace handwritten bits counting with bitmap_weight

Signed-off-by: default avatarMarcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent d652eefb

fs/udf/super.c

+5 −12
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ 
#include <linux/errno.h>

#include <linux/mount.h>

#include <linux/seq_file.h>

#include <linux/bitmap.h>

#include <asm/byteorder.h>



#include "udf_sb.h"
@@ -1958,10 +1959,6 @@ static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) 
	return 0;

}



static unsigned char udf_bitmap_lookup[16] = {

	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4

};



static unsigned int udf_count_free_bitmap(struct super_block *sb,

					  struct udf_bitmap *bitmap)

{
@@ -1971,7 +1968,6 @@ static unsigned int udf_count_free_bitmap(struct super_block *sb, 
	int block = 0, newblock;

	kernel_lb_addr loc;

	uint32_t bytes;

	uint8_t value;

	uint8_t *ptr;

	uint16_t ident;

	struct spaceBitmapDesc *bm;
@@ -1997,13 +1993,10 @@ static unsigned int udf_count_free_bitmap(struct super_block *sb, 
	ptr = (uint8_t *)bh->b_data;



	while (bytes > 0) {

		while ((bytes > 0) && (index < sb->s_blocksize)) {

			value = ptr[index];

			accum += udf_bitmap_lookup[value & 0x0f];

			accum += udf_bitmap_lookup[value >> 4];

			index++;

			bytes--;

		}

		u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);

		accum += bitmap_weight((const unsigned long *)(ptr + index),

					cur_bytes * 8);

		bytes -= cur_bytes;

		if (bytes) {

			brelse(bh);

			newblock = udf_get_lb_pblock(sb, loc, ++block);