mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 11:03:14 +00:00
498e5f2415
Convert the unsigned longs that are most responsible for bloating the stack usage on 64-bit systems. Nearly all places in the ext3/4 code which uses "unsigned long" is probably a bug, since on 32-bit systems a ulong a 32-bits, which means we are wasting stack space on 64-bit systems. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
32 lines
672 B
C
32 lines
672 B
C
/*
|
|
* 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 */
|
|
|