diff options
Diffstat (limited to 'drivers/staging/lustre/include/linux/libcfs/bitmap.h')
| -rw-r--r-- | drivers/staging/lustre/include/linux/libcfs/bitmap.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/staging/lustre/include/linux/libcfs/bitmap.h b/drivers/staging/lustre/include/linux/libcfs/bitmap.h new file mode 100644 index 000000000000..3f1c37b4bb7a --- /dev/null +++ b/drivers/staging/lustre/include/linux/libcfs/bitmap.h @@ -0,0 +1,111 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * 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 version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2012, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + */ +#ifndef _LIBCFS_BITMAP_H_ +#define _LIBCFS_BITMAP_H_ + + +typedef struct { + int size; + unsigned long data[0]; +} cfs_bitmap_t; + +#define CFS_BITMAP_SIZE(nbits) \ + (((nbits/BITS_PER_LONG)+1)*sizeof(long)+sizeof(cfs_bitmap_t)) + +static inline +cfs_bitmap_t *CFS_ALLOCATE_BITMAP(int size) +{ + cfs_bitmap_t *ptr; + + OBD_ALLOC(ptr, CFS_BITMAP_SIZE(size)); + if (ptr == NULL) + RETURN(ptr); + + ptr->size = size; + + RETURN (ptr); +} + +#define CFS_FREE_BITMAP(ptr) OBD_FREE(ptr, CFS_BITMAP_SIZE(ptr->size)) + +static inline +void cfs_bitmap_set(cfs_bitmap_t *bitmap, int nbit) +{ + set_bit(nbit, bitmap->data); +} + +static inline +void cfs_bitmap_clear(cfs_bitmap_t *bitmap, int nbit) +{ + test_and_clear_bit(nbit, bitmap->data); +} + +static inline +int cfs_bitmap_check(cfs_bitmap_t *bitmap, int nbit) +{ + return test_bit(nbit, bitmap->data); +} + +static inline +int cfs_bitmap_test_and_clear(cfs_bitmap_t *bitmap, int nbit) +{ + return test_and_clear_bit(nbit, bitmap->data); +} + +/* return 0 is bitmap has none set bits */ +static inline +int cfs_bitmap_check_empty(cfs_bitmap_t *bitmap) +{ + return find_first_bit(bitmap->data, bitmap->size) == bitmap->size; +} + +static inline +void cfs_bitmap_copy(cfs_bitmap_t *new, cfs_bitmap_t *old) +{ + int newsize; + + LASSERT(new->size >= old->size); + newsize = new->size; + memcpy(new, old, CFS_BITMAP_SIZE(old->size)); + new->size = newsize; +} + +#define cfs_foreach_bit(bitmap, pos) \ + for ((pos) = find_first_bit((bitmap)->data, bitmap->size); \ + (pos) < (bitmap)->size; \ + (pos) = find_next_bit((bitmap)->data, (bitmap)->size, (pos) + 1)) + +#endif |