1 #ifndef _LINUX_MMAP_LOCK_H
2 #define _LINUX_MMAP_LOCK_H
4 #include <linux/mmdebug.h>
6 #define MMAP_LOCK_INITIALIZER(name) \
7 .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
9 static inline void mmap_init_lock(struct mm_struct *mm)
11 init_rwsem(&mm->mmap_lock);
14 static inline void mmap_write_lock(struct mm_struct *mm)
16 down_write(&mm->mmap_lock);
19 static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
21 down_write_nested(&mm->mmap_lock, subclass);
24 static inline int mmap_write_lock_killable(struct mm_struct *mm)
26 return down_write_killable(&mm->mmap_lock);
29 static inline bool mmap_write_trylock(struct mm_struct *mm)
31 return down_write_trylock(&mm->mmap_lock) != 0;
34 static inline void mmap_write_unlock(struct mm_struct *mm)
36 up_write(&mm->mmap_lock);
39 static inline void mmap_write_downgrade(struct mm_struct *mm)
41 downgrade_write(&mm->mmap_lock);
44 static inline void mmap_read_lock(struct mm_struct *mm)
46 down_read(&mm->mmap_lock);
49 static inline int mmap_read_lock_killable(struct mm_struct *mm)
51 return down_read_killable(&mm->mmap_lock);
54 static inline bool mmap_read_trylock(struct mm_struct *mm)
56 return down_read_trylock(&mm->mmap_lock) != 0;
59 static inline void mmap_read_unlock(struct mm_struct *mm)
61 up_read(&mm->mmap_lock);
64 static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
66 if (down_read_trylock(&mm->mmap_lock)) {
67 rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_);
73 static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
75 up_read_non_owner(&mm->mmap_lock);
78 static inline void mmap_assert_locked(struct mm_struct *mm)
80 lockdep_assert_held(&mm->mmap_lock);
81 VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
84 static inline void mmap_assert_write_locked(struct mm_struct *mm)
86 lockdep_assert_held_write(&mm->mmap_lock);
87 VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
90 #endif /* _LINUX_MMAP_LOCK_H */