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-rw-r--r--fs/btrfs/bit-radix.c130
1 files changed, 0 insertions, 130 deletions
diff --git a/fs/btrfs/bit-radix.c b/fs/btrfs/bit-radix.c
deleted file mode 100644
index e8bf876..0000000
--- a/fs/btrfs/bit-radix.c
+++ /dev/null
@@ -1,130 +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 "bit-radix.h"
-
-#define BIT_ARRAY_BYTES 256
-#define BIT_RADIX_BITS_PER_ARRAY ((BIT_ARRAY_BYTES - sizeof(unsigned long)) * 8)
-
-extern struct kmem_cache *btrfs_bit_radix_cachep;
-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 = kmem_cache_alloc(btrfs_bit_radix_cachep, GFP_NOFS);
- if (!bits)
- return -ENOMEM;
- memset(bits + 1, 0, BIT_ARRAY_BYTES - sizeof(unsigned long));
- bits[0] = slot;
- ret = radix_tree_insert(radix, slot, bits);
- if (ret)
- return ret;
- }
- ret = test_and_set_bit(bit_slot, bits + 1);
- if (ret < 0)
- ret = 1;
- return ret;
-}
-
-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);
- kmem_cache_free(btrfs_bit_radix_cachep, bits);
- }
- return 0;
-}
-
-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;
-}