Line data    Source code

       1             : #ifndef _LINUX_MMAP_LOCK_H
       2             : #define _LINUX_MMAP_LOCK_H
       3             : 
       4             : #include <linux/lockdep.h>
       5             : #include <linux/mm_types.h>
       6             : #include <linux/mmdebug.h>
       7             : #include <linux/rwsem.h>
       8             : #include <linux/tracepoint-defs.h>
       9             : #include <linux/types.h>
      10             : 
      11             : #define MMAP_LOCK_INITIALIZER(name) \
      12             :         .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
      13             : 
      14             : DECLARE_TRACEPOINT(mmap_lock_start_locking);
      15             : DECLARE_TRACEPOINT(mmap_lock_acquire_returned);
      16             : DECLARE_TRACEPOINT(mmap_lock_released);
      17             : 
      18             : #ifdef CONFIG_TRACING
      19             : 
      20             : void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write);
      21             : void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
      22             :                                            bool success);
      23             : void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write);
      24             : 
      25             : static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
      26             :                                                    bool write)
      27             : {
      28             :         if (tracepoint_enabled(mmap_lock_start_locking))
      29             :                 __mmap_lock_do_trace_start_locking(mm, write);
      30             : }
      31             : 
      32             : static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
      33             :                                                       bool write, bool success)
      34             : {
      35             :         if (tracepoint_enabled(mmap_lock_acquire_returned))
      36             :                 __mmap_lock_do_trace_acquire_returned(mm, write, success);
      37             : }
      38             : 
      39             : static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
      40             : {
      41             :         if (tracepoint_enabled(mmap_lock_released))
      42             :                 __mmap_lock_do_trace_released(mm, write);
      43             : }
      44             : 
      45             : #else /* !CONFIG_TRACING */
      46             : 
      47             : static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
      48             :                                                    bool write)
      49             : {
      50             : }
      51             : 
      52             : static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
      53             :                                                       bool write, bool success)
      54             : {
      55             : }
      56             : 
      57             : static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
      58             : {
      59             : }
      60             : 
      61             : #endif /* CONFIG_TRACING */
      62             : 
      63             : static inline void mmap_init_lock(struct mm_struct *mm)
      64             : {
      65           0 :         init_rwsem(&mm->mmap_lock);
      66             : }
      67             : 
      68             : static inline void mmap_write_lock(struct mm_struct *mm)
      69             : {
      70           0 :         __mmap_lock_trace_start_locking(mm, true);
      71           0 :         down_write(&mm->mmap_lock);
      72           0 :         __mmap_lock_trace_acquire_returned(mm, true, true);
      73             : }
      74             : 
      75             : static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
      76             : {
      77           0 :         __mmap_lock_trace_start_locking(mm, true);
      78           0 :         down_write_nested(&mm->mmap_lock, subclass);
      79           0 :         __mmap_lock_trace_acquire_returned(mm, true, true);
      80             : }
      81             : 
      82             : static inline int mmap_write_lock_killable(struct mm_struct *mm)
      83             : {
      84             :         int ret;
      85             : 
      86           0 :         __mmap_lock_trace_start_locking(mm, true);
      87           0 :         ret = down_write_killable(&mm->mmap_lock);
      88           0 :         __mmap_lock_trace_acquire_returned(mm, true, ret == 0);
      89             :         return ret;
      90             : }
      91             : 
      92             : static inline bool mmap_write_trylock(struct mm_struct *mm)
      93             : {
      94             :         bool ret;
      95             : 
      96             :         __mmap_lock_trace_start_locking(mm, true);
      97             :         ret = down_write_trylock(&mm->mmap_lock) != 0;
      98             :         __mmap_lock_trace_acquire_returned(mm, true, ret);
      99             :         return ret;
     100             : }
     101             : 
     102             : static inline void mmap_write_unlock(struct mm_struct *mm)
     103             : {
     104           0 :         __mmap_lock_trace_released(mm, true);
     105           0 :         up_write(&mm->mmap_lock);
     106             : }
     107             : 
     108             : static inline void mmap_write_downgrade(struct mm_struct *mm)
     109             : {
     110           0 :         __mmap_lock_trace_acquire_returned(mm, false, true);
     111           0 :         downgrade_write(&mm->mmap_lock);
     112             : }
     113             : 
     114             : static inline void mmap_read_lock(struct mm_struct *mm)
     115             : {
     116           0 :         __mmap_lock_trace_start_locking(mm, false);
     117           0 :         down_read(&mm->mmap_lock);
     118           0 :         __mmap_lock_trace_acquire_returned(mm, false, true);
     119             : }
     120             : 
     121             : static inline int mmap_read_lock_killable(struct mm_struct *mm)
     122             : {
     123             :         int ret;
     124             : 
     125           0 :         __mmap_lock_trace_start_locking(mm, false);
     126           0 :         ret = down_read_killable(&mm->mmap_lock);
     127           0 :         __mmap_lock_trace_acquire_returned(mm, false, ret == 0);
     128             :         return ret;
     129             : }
     130             : 
     131             : static inline bool mmap_read_trylock(struct mm_struct *mm)
     132             : {
     133             :         bool ret;
     134             : 
     135           0 :         __mmap_lock_trace_start_locking(mm, false);
     136           0 :         ret = down_read_trylock(&mm->mmap_lock) != 0;
     137           0 :         __mmap_lock_trace_acquire_returned(mm, false, ret);
     138             :         return ret;
     139             : }
     140             : 
     141             : static inline void mmap_read_unlock(struct mm_struct *mm)
     142             : {
     143           0 :         __mmap_lock_trace_released(mm, false);
     144           0 :         up_read(&mm->mmap_lock);
     145             : }
     146             : 
     147             : static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
     148             : {
     149             :         __mmap_lock_trace_released(mm, false);
     150             :         up_read_non_owner(&mm->mmap_lock);
     151             : }
     152             : 
     153             : static inline void mmap_assert_locked(struct mm_struct *mm)
     154             : {
     155             :         lockdep_assert_held(&mm->mmap_lock);
     156             :         VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
     157             : }
     158             : 
     159             : static inline void mmap_assert_write_locked(struct mm_struct *mm)
     160             : {
     161             :         lockdep_assert_held_write(&mm->mmap_lock);
     162             :         VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
     163             : }
     164             : 
     165             : static inline int mmap_lock_is_contended(struct mm_struct *mm)
     166             : {
     167           0 :         return rwsem_is_contended(&mm->mmap_lock);
     168             : }
     169             : 
     170             : #endif /* _LINUX_MMAP_LOCK_H */