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 */