函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\iomap\buffered-io.c Create Date:2022-07-29 11:07:17
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：iomap_readpages_actor

函数原型：static loff_t iomap_readpages_actor(struct inode *inode, loff_t pos, loff_t length, void *data, struct iomap *iomap, struct iomap *srcmap)

返回类型：loff_t

参数：

类型参数名称
struct inode *inode
loff_tpos
loff_tlength
void *data
struct iomap *iomap
struct iomap *srcmap
402  ctx等于data
405  以done小于length循环
406  如果cur_page且offset_in_page(pos + done)恒等于0则
407  如果非cur_page_in_bio则lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
409  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
410  cur_page = NULL
412  如果非cur_page则
413  cur_page等于iomap_next_page(inode, pages, pos, length, & done)
415  如果非cur_page则退出
417  cur_page_in_bio = false
419  ret等于iomap_readpage_actor(inode, pos + done, length - done, ctx, iomap, srcmap)
423  返回:done