函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\aio.c Create Date:2022-07-29 10:53:18
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：aio_ring_mremap

函数原型：static int aio_ring_mremap(struct vm_area_struct *vma)

返回类型：int

参数：

类型参数名称
struct vm_area_struct *vma
329  file等于File we map to (can be NULL).
330  mm等于The address space we belong to.
332  res等于负EINVAL
334  加自旋锁
335  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
336  table等于cu_dereference() - fetch RCU-protected pointer for dereferencing*@p: The pointer to read, prior to dereferencing* This is a simple wrapper around rcu_dereference_check().(ioctx_table)
337  以i小于nr循环
340  ctx等于cu_dereference() - fetch RCU-protected pointer for dereferencing*@p: The pointer to read, prior to dereferencing* This is a simple wrapper around rcu_dereference_check().(table[i])
341  如果ctx且aio_ring_file恒等于file则
342  如果非atomic_read( & dead)则
346  退出
350  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
351  自旋锁解锁
352  返回:res