btrfs-progs: remove unused bit-radix.[ch] files
fd53de4d Drop bit-radix.[ch] files
removed the files from the Makefile, but not the files themselves.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>This commit is contained in:
Eric Sandeen
David Sterba
parent
a8cb2d03dd
commit
5e7b9d2156
211
bit-radix.c
211
bit-radix.c
|
|
@ -1,211 +0,0 @@
|
||||||
/*
|
|
||||||
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
||||||
*
|
|
||||||
* This program is free software; you can redistribute it and/or
|
|
||||||
* modify it under the terms of the GNU General Public
|
|
||||||
* License v2 as published by the Free Software Foundation.
|
|
||||||
*
|
|
||||||
* This program is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
||||||
* General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU General Public
|
|
||||||
* License along with this program; if not, write to the
|
|
||||||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
||||||
* Boston, MA 021110-1307, USA.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include "kerncompat.h"
|
|
||||||
#include "radix-tree.h"
|
|
||||||
|
|
||||||
#define BIT_ARRAY_BYTES 256
|
|
||||||
#define BIT_RADIX_BITS_PER_ARRAY ((BIT_ARRAY_BYTES - sizeof(unsigned long)) * 8)
|
|
||||||
|
|
||||||
int set_radix_bit(struct radix_tree_root *radix, unsigned long bit)
|
|
||||||
{
|
|
||||||
unsigned long *bits;
|
|
||||||
unsigned long slot;
|
|
||||||
int bit_slot;
|
|
||||||
int ret;
|
|
||||||
|
|
||||||
slot = bit / BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
bit_slot = bit % BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
|
|
||||||
bits = radix_tree_lookup(radix, slot);
|
|
||||||
if (!bits) {
|
|
||||||
bits = malloc(BIT_ARRAY_BYTES);
|
|
||||||
if (!bits)
|
|
||||||
return -ENOMEM;
|
|
||||||
memset(bits + 1, 0, BIT_ARRAY_BYTES - sizeof(unsigned long));
|
|
||||||
bits[0] = slot;
|
|
||||||
radix_tree_preload(GFP_NOFS);
|
|
||||||
ret = radix_tree_insert(radix, slot, bits);
|
|
||||||
radix_tree_preload_end();
|
|
||||||
if (ret)
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
__set_bit(bit_slot, bits + 1);
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
int test_radix_bit(struct radix_tree_root *radix, unsigned long bit)
|
|
||||||
{
|
|
||||||
unsigned long *bits;
|
|
||||||
unsigned long slot;
|
|
||||||
int bit_slot;
|
|
||||||
|
|
||||||
slot = bit / BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
bit_slot = bit % BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
|
|
||||||
bits = radix_tree_lookup(radix, slot);
|
|
||||||
if (!bits)
|
|
||||||
return 0;
|
|
||||||
return test_bit(bit_slot, bits + 1);
|
|
||||||
}
|
|
||||||
|
|
||||||
int clear_radix_bit(struct radix_tree_root *radix, unsigned long bit)
|
|
||||||
{
|
|
||||||
unsigned long *bits;
|
|
||||||
unsigned long slot;
|
|
||||||
int bit_slot;
|
|
||||||
int i;
|
|
||||||
int empty = 1;
|
|
||||||
slot = bit / BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
bit_slot = bit % BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
|
|
||||||
bits = radix_tree_lookup(radix, slot);
|
|
||||||
if (!bits)
|
|
||||||
return 0;
|
|
||||||
__clear_bit(bit_slot, bits + 1);
|
|
||||||
for (i = 1; i < BIT_ARRAY_BYTES / sizeof(unsigned long); i++) {
|
|
||||||
if (bits[i]) {
|
|
||||||
empty = 0;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
if (empty) {
|
|
||||||
bits = radix_tree_delete(radix, slot);
|
|
||||||
BUG_ON(!bits);
|
|
||||||
free(bits);
|
|
||||||
}
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
||||||
|
|
||||||
/**
|
|
||||||
* __ffs - find first bit in word.
|
|
||||||
* @word: The word to search
|
|
||||||
*
|
|
||||||
* Undefined if no bit exists, so code should check against 0 first.
|
|
||||||
*/
|
|
||||||
static unsigned long __ffs(unsigned long word)
|
|
||||||
{
|
|
||||||
int num = 0;
|
|
||||||
|
|
||||||
if (sizeof(long) == 8 && (word & 0xffffffff) == 0) {
|
|
||||||
num += 32;
|
|
||||||
word >>= sizeof(long) * 4;
|
|
||||||
}
|
|
||||||
if ((word & 0xffff) == 0) {
|
|
||||||
num += 16;
|
|
||||||
word >>= 16;
|
|
||||||
}
|
|
||||||
if ((word & 0xff) == 0) {
|
|
||||||
num += 8;
|
|
||||||
word >>= 8;
|
|
||||||
}
|
|
||||||
if ((word & 0xf) == 0) {
|
|
||||||
num += 4;
|
|
||||||
word >>= 4;
|
|
||||||
}
|
|
||||||
if ((word & 0x3) == 0) {
|
|
||||||
num += 2;
|
|
||||||
word >>= 2;
|
|
||||||
}
|
|
||||||
if ((word & 0x1) == 0)
|
|
||||||
num += 1;
|
|
||||||
return num;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* find_next_bit - find the next set bit in a memory region
|
|
||||||
* @addr: The address to base the search on
|
|
||||||
* @offset: The bitnumber to start searching at
|
|
||||||
* @size: The maximum size to search
|
|
||||||
*/
|
|
||||||
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
|
|
||||||
unsigned long offset)
|
|
||||||
{
|
|
||||||
const unsigned long *p = addr + BITOP_WORD(offset);
|
|
||||||
unsigned long result = offset & ~(BITS_PER_LONG-1);
|
|
||||||
unsigned long tmp;
|
|
||||||
|
|
||||||
if (offset >= size)
|
|
||||||
return size;
|
|
||||||
size -= result;
|
|
||||||
offset %= BITS_PER_LONG;
|
|
||||||
if (offset) {
|
|
||||||
tmp = *(p++);
|
|
||||||
tmp &= (~0UL << offset);
|
|
||||||
if (size < BITS_PER_LONG)
|
|
||||||
goto found_first;
|
|
||||||
if (tmp)
|
|
||||||
goto found_middle;
|
|
||||||
size -= BITS_PER_LONG;
|
|
||||||
result += BITS_PER_LONG;
|
|
||||||
}
|
|
||||||
while (size & ~(BITS_PER_LONG-1)) {
|
|
||||||
if ((tmp = *(p++)))
|
|
||||||
goto found_middle;
|
|
||||||
result += BITS_PER_LONG;
|
|
||||||
size -= BITS_PER_LONG;
|
|
||||||
}
|
|
||||||
if (!size)
|
|
||||||
return result;
|
|
||||||
tmp = *p;
|
|
||||||
|
|
||||||
found_first:
|
|
||||||
tmp &= (~0UL >> (BITS_PER_LONG - size));
|
|
||||||
if (tmp == 0UL) /* Are any bits set? */
|
|
||||||
return result + size; /* Nope. */
|
|
||||||
found_middle:
|
|
||||||
return result + __ffs(tmp);
|
|
||||||
}
|
|
||||||
|
|
||||||
int find_first_radix_bit(struct radix_tree_root *radix, unsigned long *retbits,
|
|
||||||
unsigned long start, int nr)
|
|
||||||
{
|
|
||||||
unsigned long *bits;
|
|
||||||
unsigned long *gang[4];
|
|
||||||
int found;
|
|
||||||
int ret;
|
|
||||||
int i;
|
|
||||||
int total_found = 0;
|
|
||||||
unsigned long slot;
|
|
||||||
|
|
||||||
slot = start / BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
ret = radix_tree_gang_lookup(radix, (void *)gang, slot,
|
|
||||||
ARRAY_SIZE(gang));
|
|
||||||
found = start % BIT_RADIX_BITS_PER_ARRAY;
|
|
||||||
for (i = 0; i < ret && nr > 0; i++) {
|
|
||||||
bits = gang[i];
|
|
||||||
while(nr > 0) {
|
|
||||||
found = find_next_bit(bits + 1,
|
|
||||||
BIT_RADIX_BITS_PER_ARRAY,
|
|
||||||
found);
|
|
||||||
if (found < BIT_RADIX_BITS_PER_ARRAY) {
|
|
||||||
*retbits = bits[0] *
|
|
||||||
BIT_RADIX_BITS_PER_ARRAY + found;
|
|
||||||
retbits++;
|
|
||||||
nr--;
|
|
||||||
total_found++;
|
|
||||||
found++;
|
|
||||||
} else
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
found = 0;
|
|
||||||
}
|
|
||||||
return total_found;
|
|
||||||
}
|
|
||||||
33
bit-radix.h
33
bit-radix.h
|
|
@ -1,33 +0,0 @@
|
||||||
/*
|
|
||||||
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
||||||
*
|
|
||||||
* This program is free software; you can redistribute it and/or
|
|
||||||
* modify it under the terms of the GNU General Public
|
|
||||||
* License v2 as published by the Free Software Foundation.
|
|
||||||
*
|
|
||||||
* This program is distributed in the hope that it will be useful,
|
|
||||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
||||||
* General Public License for more details.
|
|
||||||
*
|
|
||||||
* You should have received a copy of the GNU General Public
|
|
||||||
* License along with this program; if not, write to the
|
|
||||||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
||||||
* Boston, MA 021110-1307, USA.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#ifndef __BIT_RADIX__
|
|
||||||
#define __BIT_RADIX__
|
|
||||||
#include "radix-tree.h"
|
|
||||||
|
|
||||||
int set_radix_bit(struct radix_tree_root *radix, unsigned long bit);
|
|
||||||
int test_radix_bit(struct radix_tree_root *radix, unsigned long bit);
|
|
||||||
int clear_radix_bit(struct radix_tree_root *radix, unsigned long bit);
|
|
||||||
int find_first_radix_bit(struct radix_tree_root *radix, unsigned long *retbits,
|
|
||||||
unsigned long start, int nr);
|
|
||||||
|
|
||||||
static inline void init_bit_radix(struct radix_tree_root *radix)
|
|
||||||
{
|
|
||||||
INIT_RADIX_TREE(radix, GFP_NOFS);
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
Loading…
Reference in New Issue