函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\page-writeback.c Create Date:2022-07-27 15:34:53
Last Modify:2022-05-23 13:25:58 Copyright©Brick
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函数名称：When a writepage implementation decides that it doesn't want to write this* page for some reason, it should redirty the locked page via* redirty_page_for_writepage() and it should then unlock the page and return 0

函数原型：int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page)

返回类型：int

参数：

类型参数名称
struct writeback_control *wbc
struct page *page
2531  Pages which were not written 自加
2532  ret等于For address_spaces which do not use buffers. Just tag the page as dirty in* the xarray.* This is also used when a single buffer is being dirtied: we want to set the* page dirty in that case, but not all the buffers. This is a "bottom-up"
2533  Call this whenever redirtying a page, to de-account the dirty counters* (NR_DIRTIED, WB_DIRTIED, tsk->nr_dirtied), so that they match the written* counters (NR_WRITTEN, WB_WRITTEN) in long term
2534  返回:ret
调用者
名称描述
iomap_do_writepageWrite out a dirty page.* For delalloc space on the page we need to allocate space and flush it.* For unwritten space on the page we need to start the conversion to* regular allocated space.
__block_write_full_pageWhile block_write_full_page is writing back the dirty buffers under* the page lock, whoever dirtied the buffers may decide to clean them* again at any time