180 lines
4.4 KiB
C
180 lines
4.4 KiB
C
#ifndef _LINUX_MMAP_LOCK_H
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#define _LINUX_MMAP_LOCK_H
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#include <linux/lockdep.h>
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#include <linux/mm_types.h>
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#include <linux/mmdebug.h>
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#include <linux/rwsem.h>
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#include <linux/tracepoint-defs.h>
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#include <linux/types.h>
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#define MMAP_LOCK_INITIALIZER(name) \
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.mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
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DECLARE_TRACEPOINT(mmap_lock_start_locking);
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DECLARE_TRACEPOINT(mmap_lock_acquire_returned);
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DECLARE_TRACEPOINT(mmap_lock_released);
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#ifdef CONFIG_TRACING
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void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write);
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void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
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bool success);
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void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write);
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static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
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bool write)
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{
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if (tracepoint_enabled(mmap_lock_start_locking))
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__mmap_lock_do_trace_start_locking(mm, write);
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}
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static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
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bool write, bool success)
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{
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if (tracepoint_enabled(mmap_lock_acquire_returned))
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__mmap_lock_do_trace_acquire_returned(mm, write, success);
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}
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static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
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{
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if (tracepoint_enabled(mmap_lock_released))
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__mmap_lock_do_trace_released(mm, write);
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}
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#else /* !CONFIG_TRACING */
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static inline void __mmap_lock_trace_start_locking(struct mm_struct *mm,
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bool write)
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{
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}
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static inline void __mmap_lock_trace_acquire_returned(struct mm_struct *mm,
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bool write, bool success)
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{
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}
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static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
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{
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}
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#endif /* CONFIG_TRACING */
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static inline void mmap_init_lock(struct mm_struct *mm)
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{
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init_rwsem(&mm->mmap_lock);
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}
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static inline void mmap_write_lock(struct mm_struct *mm)
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{
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__mmap_lock_trace_start_locking(mm, true);
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down_write(&mm->mmap_lock);
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__mmap_lock_trace_acquire_returned(mm, true, true);
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}
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static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
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{
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__mmap_lock_trace_start_locking(mm, true);
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down_write_nested(&mm->mmap_lock, subclass);
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__mmap_lock_trace_acquire_returned(mm, true, true);
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}
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static inline int mmap_write_lock_killable(struct mm_struct *mm)
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{
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int ret;
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__mmap_lock_trace_start_locking(mm, true);
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ret = down_write_killable(&mm->mmap_lock);
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__mmap_lock_trace_acquire_returned(mm, true, ret == 0);
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return ret;
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}
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static inline bool mmap_write_trylock(struct mm_struct *mm)
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{
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bool ret;
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__mmap_lock_trace_start_locking(mm, true);
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ret = down_write_trylock(&mm->mmap_lock) != 0;
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__mmap_lock_trace_acquire_returned(mm, true, ret);
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return ret;
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}
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static inline void mmap_write_unlock(struct mm_struct *mm)
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{
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up_write(&mm->mmap_lock);
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__mmap_lock_trace_released(mm, true);
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}
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static inline void mmap_write_downgrade(struct mm_struct *mm)
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{
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downgrade_write(&mm->mmap_lock);
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__mmap_lock_trace_acquire_returned(mm, false, true);
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}
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static inline void mmap_read_lock(struct mm_struct *mm)
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{
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__mmap_lock_trace_start_locking(mm, false);
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down_read(&mm->mmap_lock);
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__mmap_lock_trace_acquire_returned(mm, false, true);
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}
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static inline int mmap_read_lock_killable(struct mm_struct *mm)
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{
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int ret;
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__mmap_lock_trace_start_locking(mm, false);
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ret = down_read_killable(&mm->mmap_lock);
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__mmap_lock_trace_acquire_returned(mm, false, ret == 0);
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return ret;
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}
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static inline bool mmap_read_trylock(struct mm_struct *mm)
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{
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bool ret;
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__mmap_lock_trace_start_locking(mm, false);
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ret = down_read_trylock(&mm->mmap_lock) != 0;
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__mmap_lock_trace_acquire_returned(mm, false, ret);
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return ret;
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}
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static inline void mmap_read_unlock(struct mm_struct *mm)
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{
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up_read(&mm->mmap_lock);
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__mmap_lock_trace_released(mm, false);
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}
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static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
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{
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if (mmap_read_trylock(mm)) {
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rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_);
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return true;
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}
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return false;
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}
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static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
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{
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up_read_non_owner(&mm->mmap_lock);
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__mmap_lock_trace_released(mm, false);
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}
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static inline void mmap_assert_locked(struct mm_struct *mm)
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{
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lockdep_assert_held(&mm->mmap_lock);
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VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
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}
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static inline void mmap_assert_write_locked(struct mm_struct *mm)
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{
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lockdep_assert_held_write(&mm->mmap_lock);
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VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
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}
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static inline int mmap_lock_is_contended(struct mm_struct *mm)
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{
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return rwsem_is_contended(&mm->mmap_lock);
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}
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#endif /* _LINUX_MMAP_LOCK_H */
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