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29 * This file is part of Lustre, http://www.lustre.org/
31 #ifndef _LIBCFS_BITMAP_H_
32 #define _LIBCFS_BITMAP_H_
34 #include <linux/interrupt.h>
35 #include <libcfs/libcfs_private.h>
39 unsigned long data[0];
42 #define CFS_BITMAP_SIZE(nbits) \
43 (BITS_TO_LONGS(nbits) * sizeof(long) + sizeof(struct cfs_bitmap))
46 struct cfs_bitmap *CFS_ALLOCATE_BITMAP(int size)
48 struct cfs_bitmap *ptr;
50 LIBCFS_ALLOC(ptr, CFS_BITMAP_SIZE(size));
59 static inline void CFS_RESET_BITMAP(struct cfs_bitmap *bitmap)
61 if (bitmap->size > 0) {
62 int nbits = bitmap->size;
64 memset(bitmap, 0, CFS_BITMAP_SIZE(nbits));
69 #define CFS_FREE_BITMAP(ptr) LIBCFS_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
72 void cfs_bitmap_set(struct cfs_bitmap *bitmap, int nbit)
74 set_bit(nbit, bitmap->data);
78 void cfs_bitmap_clear(struct cfs_bitmap *bitmap, int nbit)
80 test_and_clear_bit(nbit, bitmap->data);
84 int cfs_bitmap_check(struct cfs_bitmap *bitmap, int nbit)
86 return test_bit(nbit, bitmap->data);
90 int cfs_bitmap_test_and_clear(struct cfs_bitmap *bitmap, int nbit)
92 return test_and_clear_bit(nbit, bitmap->data);
95 /* return 0 is bitmap has none set bits */
97 int cfs_bitmap_check_empty(struct cfs_bitmap *bitmap)
99 return find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
103 void cfs_bitmap_copy(struct cfs_bitmap *new, struct cfs_bitmap *old)
107 LASSERT(new->size >= old->size);
109 memcpy(new, old, CFS_BITMAP_SIZE(old->size));
113 #define cfs_foreach_bit(bitmap, pos) \
114 for ((pos) = find_first_bit((bitmap)->data, bitmap->size); \
115 (pos) < (bitmap)->size; \
116 (pos) = find_next_bit((bitmap)->data, (bitmap)->size, (pos) + 1))