bdi: invert BDI_CAP_NO_ACCT_WB
[linux-2.6-microblaze.git] / include / linux / mmap_lock.h
1 #ifndef _LINUX_MMAP_LOCK_H
2 #define _LINUX_MMAP_LOCK_H
3
4 #include <linux/mmdebug.h>
5
6 #define MMAP_LOCK_INITIALIZER(name) \
7         .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
8
9 static inline void mmap_init_lock(struct mm_struct *mm)
10 {
11         init_rwsem(&mm->mmap_lock);
12 }
13
14 static inline void mmap_write_lock(struct mm_struct *mm)
15 {
16         down_write(&mm->mmap_lock);
17 }
18
19 static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
20 {
21         down_write_nested(&mm->mmap_lock, subclass);
22 }
23
24 static inline int mmap_write_lock_killable(struct mm_struct *mm)
25 {
26         return down_write_killable(&mm->mmap_lock);
27 }
28
29 static inline bool mmap_write_trylock(struct mm_struct *mm)
30 {
31         return down_write_trylock(&mm->mmap_lock) != 0;
32 }
33
34 static inline void mmap_write_unlock(struct mm_struct *mm)
35 {
36         up_write(&mm->mmap_lock);
37 }
38
39 static inline void mmap_write_downgrade(struct mm_struct *mm)
40 {
41         downgrade_write(&mm->mmap_lock);
42 }
43
44 static inline void mmap_read_lock(struct mm_struct *mm)
45 {
46         down_read(&mm->mmap_lock);
47 }
48
49 static inline int mmap_read_lock_killable(struct mm_struct *mm)
50 {
51         return down_read_killable(&mm->mmap_lock);
52 }
53
54 static inline bool mmap_read_trylock(struct mm_struct *mm)
55 {
56         return down_read_trylock(&mm->mmap_lock) != 0;
57 }
58
59 static inline void mmap_read_unlock(struct mm_struct *mm)
60 {
61         up_read(&mm->mmap_lock);
62 }
63
64 static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
65 {
66         if (down_read_trylock(&mm->mmap_lock)) {
67                 rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_);
68                 return true;
69         }
70         return false;
71 }
72
73 static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
74 {
75         up_read_non_owner(&mm->mmap_lock);
76 }
77
78 static inline void mmap_assert_locked(struct mm_struct *mm)
79 {
80         lockdep_assert_held(&mm->mmap_lock);
81         VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
82 }
83
84 static inline void mmap_assert_write_locked(struct mm_struct *mm)
85 {
86         lockdep_assert_held_write(&mm->mmap_lock);
87         VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
88 }
89
90 #endif /* _LINUX_MMAP_LOCK_H */