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36 #ifndef _LIBCFS_BITMAP_H_
37 #define _LIBCFS_BITMAP_H_
39 #if !defined(__linux__) || !defined(__KERNEL__)
40 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
41 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, 8 * sizeof(long))
43 #define DECLARE_BITMAP(name, bits) \
44 unsigned long name[BITS_TO_LONGS(bits)]
49 unsigned long data[0];
52 #define CFS_BITMAP_SIZE(nbits) \
53 (((nbits/BITS_PER_LONG)+1)*sizeof(long)+sizeof(cfs_bitmap_t))
56 cfs_bitmap_t *CFS_ALLOCATE_BITMAP(int size)
60 LIBCFS_ALLOC(ptr, CFS_BITMAP_SIZE(size));
69 #define CFS_FREE_BITMAP(ptr) LIBCFS_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
72 void cfs_bitmap_set(cfs_bitmap_t *bitmap, int nbit)
74 set_bit(nbit, bitmap->data);
78 void cfs_bitmap_clear(cfs_bitmap_t *bitmap, int nbit)
80 test_and_clear_bit(nbit, bitmap->data);
84 int cfs_bitmap_check(cfs_bitmap_t *bitmap, int nbit)
86 return test_bit(nbit, bitmap->data);
90 int cfs_bitmap_test_and_clear(cfs_bitmap_t *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(cfs_bitmap_t *bitmap)
99 return find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
103 void cfs_bitmap_copy(cfs_bitmap_t *new, cfs_bitmap_t *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))