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36 #ifndef _LIBCFS_BITMAP_H_
37 #define _LIBCFS_BITMAP_H_
41 unsigned long data[0];
44 #define CFS_BITMAP_SIZE(nbits) \
45 (((nbits / BITS_PER_LONG) + 1) * sizeof(long) + \
46 sizeof(struct cfs_bitmap))
49 struct cfs_bitmap *CFS_ALLOCATE_BITMAP(int size)
51 struct cfs_bitmap *ptr;
53 LIBCFS_ALLOC(ptr, CFS_BITMAP_SIZE(size));
62 static inline void CFS_RESET_BITMAP(struct cfs_bitmap *bitmap)
64 if (bitmap->size > 0) {
65 int nbits = bitmap->size;
67 memset(bitmap, 0, CFS_BITMAP_SIZE(nbits));
72 #define CFS_FREE_BITMAP(ptr) LIBCFS_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
75 void cfs_bitmap_set(struct cfs_bitmap *bitmap, int nbit)
77 set_bit(nbit, bitmap->data);
81 void cfs_bitmap_clear(struct cfs_bitmap *bitmap, int nbit)
83 test_and_clear_bit(nbit, bitmap->data);
87 int cfs_bitmap_check(struct cfs_bitmap *bitmap, int nbit)
89 return test_bit(nbit, bitmap->data);
93 int cfs_bitmap_test_and_clear(struct cfs_bitmap *bitmap, int nbit)
95 return test_and_clear_bit(nbit, bitmap->data);
98 /* return 0 is bitmap has none set bits */
100 int cfs_bitmap_check_empty(struct cfs_bitmap *bitmap)
102 return find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
106 void cfs_bitmap_copy(struct cfs_bitmap *new, struct cfs_bitmap *old)
110 LASSERT(new->size >= old->size);
112 memcpy(new, old, CFS_BITMAP_SIZE(old->size));
116 #define cfs_foreach_bit(bitmap, pos) \
117 for ((pos) = find_first_bit((bitmap)->data, bitmap->size); \
118 (pos) < (bitmap)->size; \
119 (pos) = find_next_bit((bitmap)->data, (bitmap)->size, (pos) + 1))