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36 #ifndef _LIBCFS_BITMAP_H_
37 #define _LIBCFS_BITMAP_H_
42 unsigned long data[0];
45 #define CFS_BITMAP_SIZE(nbits) \
46 (((nbits/BITS_PER_LONG)+1)*sizeof(long)+sizeof(cfs_bitmap_t))
49 cfs_bitmap_t *CFS_ALLOCATE_BITMAP(int size)
53 OBD_ALLOC(ptr, CFS_BITMAP_SIZE(size));
62 #define CFS_FREE_BITMAP(ptr) OBD_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
65 void cfs_bitmap_set(cfs_bitmap_t *bitmap, int nbit)
67 set_bit(nbit, bitmap->data);
71 void cfs_bitmap_clear(cfs_bitmap_t *bitmap, int nbit)
73 test_and_clear_bit(nbit, bitmap->data);
77 int cfs_bitmap_check(cfs_bitmap_t *bitmap, int nbit)
79 return test_bit(nbit, bitmap->data);
83 int cfs_bitmap_test_and_clear(cfs_bitmap_t *bitmap, int nbit)
85 return test_and_clear_bit(nbit, bitmap->data);
88 /* return 0 is bitmap has none set bits */
90 int cfs_bitmap_check_empty(cfs_bitmap_t *bitmap)
92 return find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
96 void cfs_bitmap_copy(cfs_bitmap_t *new, cfs_bitmap_t *old)
100 LASSERT(new->size >= old->size);
102 memcpy(new, old, CFS_BITMAP_SIZE(old->size));
106 #define cfs_foreach_bit(bitmap, pos) \
107 for ((pos) = find_first_bit((bitmap)->data, bitmap->size); \
108 (pos) < (bitmap)->size; \
109 (pos) = find_next_bit((bitmap)->data, (bitmap)->size, (pos) + 1))