函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\direct-io.c Create Date:2022-07-29 10:46:32
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Asynchronous IO callback.

函数原型：static void dio_bio_end_aio(struct bio *bio)

返回类型：void

参数：

类型参数名称
struct bio *bio
332  dio等于bi_private
335  bool defer_completion = false
338  dio_bio_complete(dio, bio)
340  spin_lock_irqsave( & protects BIO fields below , flags)
341  remaining等于direct_io_worker() and bios 先自减
342  如果remaining恒等于1且waiting task (NULL if none) 则唤醒中断线程
344  spin_unlock_irqrestore( & protects BIO fields below , flags)
346  如果remaining恒等于0则
355  如果IO result 则defer_completion等于defer AIO completion to workqueue? 或op恒等于REQ_OP_WRITE且nrpages
359  如果defer_completion则
360  INIT_WORK( & deferred AIO completion , dio_aio_complete_work)
361  queue_work - queue work on a workqueue*@wq: workqueue to use*@work: work to queue* Returns %false if @work was already on a queue, %true otherwise.* We queue the work to the CPU on which it was submitted, but if the CPU dies
363  否则
364  dio_complete() - called when all DIO BIO I/O has been completed* This drops i_dio_count, lets interested parties know that a DIO operation* has completed, and calculates the resulting return code for the operation
调用者
名称描述
dio_end_iodio_end_io - handle the end io action for the given bio*@bio: The direct io bio thats being completed* This is meant to be called by any filesystem that uses their own dio_submit_t* so that the DIO specific endio actions are dealt with after the filesystem