4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
34 #ifndef _LIBCFS_BITMAP_H_
35 #define _LIBCFS_BITMAP_H_
40 unsigned long data[0];
43 #define CFS_BITMAP_SIZE(nbits) \
44 (((nbits/BITS_PER_LONG)+1)*sizeof(long)+sizeof(cfs_bitmap_t))
47 cfs_bitmap_t *CFS_ALLOCATE_BITMAP(int size)
51 OBD_ALLOC(ptr, CFS_BITMAP_SIZE(size));
60 #define CFS_FREE_BITMAP(ptr) OBD_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
63 void cfs_bitmap_set(cfs_bitmap_t *bitmap, int nbit)
65 cfs_set_bit(nbit, bitmap->data);
69 void cfs_bitmap_clear(cfs_bitmap_t *bitmap, int nbit)
71 cfs_test_and_clear_bit(nbit, bitmap->data);
75 int cfs_bitmap_check(cfs_bitmap_t *bitmap, int nbit)
77 return cfs_test_bit(nbit, bitmap->data);
81 int cfs_bitmap_test_and_clear(cfs_bitmap_t *bitmap, int nbit)
83 return cfs_test_and_clear_bit(nbit, bitmap->data);
86 /* return 0 is bitmap has none set bits */
88 int cfs_bitmap_check_empty(cfs_bitmap_t *bitmap)
90 return cfs_find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
93 #define cfs_foreach_bit(bitmap, pos) \
94 for((pos)=cfs_find_first_bit((bitmap)->data, bitmap->size); \
95 (pos) < (bitmap)->size; \
96 (pos) = cfs_find_next_bit((bitmap)->data, (bitmap)->size, (pos)))