LXR linux/include/linux/mmap

   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
   9static inline void mmap_init_lock(struct mm_struct *mm)
  10{
  11        init_rwsem(&mm->mmap_lock);
  12}
  13
  14static inline void mmap_write_lock(struct mm_struct *mm)
  15{
  16        down_write(&mm->mmap_lock);
  17}
  18
  19static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
  20{
  21        down_write_nested(&mm->mmap_lock, subclass);
  22}
  23
  24static inline int mmap_write_lock_killable(struct mm_struct *mm)
  25{
  26        return down_write_killable(&mm->mmap_lock);
  27}
  28
  29static inline bool mmap_write_trylock(struct mm_struct *mm)
  30{
  31        return down_write_trylock(&mm->mmap_lock) != 0;
  32}
  33
  34static inline void mmap_write_unlock(struct mm_struct *mm)
  35{
  36        up_write(&mm->mmap_lock);
  37}
  38
  39static inline void mmap_write_downgrade(struct mm_struct *mm)
  40{
  41        downgrade_write(&mm->mmap_lock);
  42}
  43
  44static inline void mmap_read_lock(struct mm_struct *mm)
  45{
  46        down_read(&mm->mmap_lock);
  47}
  48
  49static inline int mmap_read_lock_killable(struct mm_struct *mm)
  50{
  51        return down_read_killable(&mm->mmap_lock);
  52}
  53
  54static inline bool mmap_read_trylock(struct mm_struct *mm)
  55{
  56        return down_read_trylock(&mm->mmap_lock) != 0;
  57}
  58
  59static inline void mmap_read_unlock(struct mm_struct *mm)
  60{
  61        up_read(&mm->mmap_lock);
  62}
  63
  64static 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
  73static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
  74{
  75        up_read_non_owner(&mm->mmap_lock);
  76}
  77
  78static 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
  84static 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 */
  91