函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\bio.c Create Date:2022-07-27 18:31:54
Last Modify:2020-03-17 23:13:58 Copyright©Brick
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函数名称：_associate_blkg_from_page - associate a bio with the page's blkg*@bio: target bio*@page: the page to lookup the blkcg from* Associate @bio with the blkg from @page's owning memcg and the respective* request_queue

函数原型：void bio_associate_blkg_from_page(struct bio *bio, struct page *page)

返回类型：void

参数：

类型参数名称
struct bio *bio
struct page *page
2131  如果非mem_cgroup则返回
2134  _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
2136  css等于group_e_css - obtain a cgroup's effective css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest* Find and get the effective css of @cgrp for @ss
2137  _associate_blkg_from_css - associate a bio with a specified css*@bio: target bio*@css: target css* Associate @bio with the blkg found by combining the css's blkg and the* request_queue of the @bio. This falls back to the queue's root_blkg if
2139  _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()