1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef BTRFS_MISC_H
4 #define BTRFS_MISC_H
5
6 #include <linux/sched.h>
7 #include <linux/wait.h>
8 #include <asm/div64.h>
9
10 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
11
cond_wake_up(struct wait_queue_head * wq)12 static inline void cond_wake_up(struct wait_queue_head *wq)
13 {
14 /*
15 * This implies a full smp_mb barrier, see comments for
16 * waitqueue_active why.
17 */
18 if (wq_has_sleeper(wq))
19 wake_up(wq);
20 }
21
cond_wake_up_nomb(struct wait_queue_head * wq)22 static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
23 {
24 /*
25 * Special case for conditional wakeup where the barrier required for
26 * waitqueue_active is implied by some of the preceding code. Eg. one
27 * of such atomic operations (atomic_dec_and_return, ...), or a
28 * unlock/lock sequence, etc.
29 */
30 if (waitqueue_active(wq))
31 wake_up(wq);
32 }
33
div_factor(u64 num,int factor)34 static inline u64 div_factor(u64 num, int factor)
35 {
36 if (factor == 10)
37 return num;
38 num *= factor;
39 return div_u64(num, 10);
40 }
41
div_factor_fine(u64 num,int factor)42 static inline u64 div_factor_fine(u64 num, int factor)
43 {
44 if (factor == 100)
45 return num;
46 num *= factor;
47 return div_u64(num, 100);
48 }
49
50 #endif
51