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32 #ifndef _LIBCFS_BITMAP_H_
33 #define _LIBCFS_BITMAP_H_
35 #include <linux/interrupt.h>
36 #include <libcfs/libcfs_private.h>
40 unsigned long data[0];
43 #define CFS_BITMAP_SIZE(nbits) \
44 (((nbits / BITS_PER_LONG) + 1) * sizeof(long) + \
45 sizeof(struct cfs_bitmap))
48 struct cfs_bitmap *CFS_ALLOCATE_BITMAP(int size)
50 struct cfs_bitmap *ptr;
52 LIBCFS_ALLOC(ptr, CFS_BITMAP_SIZE(size));
61 static inline void CFS_RESET_BITMAP(struct cfs_bitmap *bitmap)
63 if (bitmap->size > 0) {
64 int nbits = bitmap->size;
66 memset(bitmap, 0, CFS_BITMAP_SIZE(nbits));
71 #define CFS_FREE_BITMAP(ptr) LIBCFS_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
74 void cfs_bitmap_set(struct cfs_bitmap *bitmap, int nbit)
76 set_bit(nbit, bitmap->data);
80 void cfs_bitmap_clear(struct cfs_bitmap *bitmap, int nbit)
82 test_and_clear_bit(nbit, bitmap->data);
86 int cfs_bitmap_check(struct cfs_bitmap *bitmap, int nbit)
88 return test_bit(nbit, bitmap->data);
92 int cfs_bitmap_test_and_clear(struct cfs_bitmap *bitmap, int nbit)
94 return test_and_clear_bit(nbit, bitmap->data);
97 /* return 0 is bitmap has none set bits */
99 int cfs_bitmap_check_empty(struct cfs_bitmap *bitmap)
101 return find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
105 void cfs_bitmap_copy(struct cfs_bitmap *new, struct cfs_bitmap *old)
109 LASSERT(new->size >= old->size);
111 memcpy(new, old, CFS_BITMAP_SIZE(old->size));
115 #define cfs_foreach_bit(bitmap, pos) \
116 for ((pos) = find_first_bit((bitmap)->data, bitmap->size); \
117 (pos) < (bitmap)->size; \
118 (pos) = find_next_bit((bitmap)->data, (bitmap)->size, (pos) + 1))