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 18:30:27
Last Modify:2020-03-17 23:13:58 Copyright©Brick
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函数名称：bio_add_pc_page

函数原型：int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset)

返回类型：int

参数：

类型参数名称
struct request_queue *q
struct bio *bio
struct page *page
unsigned intlen
unsigned intoffset
779  bool same_page = false
780  返回:__bio_add_pc_page - attempt to add page to passthrough bio*@q: the target queue*@bio: destination bio*@page: page to add*@len: vec entry length*@offset: vec entry offset*@same_page: return if the merge happen inside the same page
调用者
名称描述
bio_copy_user_iov_copy_user_iov - copy user data to bio*@q: destination block queue*@map_data: pointer to the rq_map_data holding pages (if necessary)*@iter: iovec iterator*@gfp_mask: memory allocation flags* Prepares and returns a bio for indirect user io, bouncing data
bio_map_kern_map_kern - map kernel address into bio*@q: the struct request_queue for the bio*@data: pointer to buffer to map*@len: length in bytes*@gfp_mask: allocation flags for bio allocation* Map the kernel address into a bio suitable for io to a block* device
bio_copy_kern_copy_kern - copy kernel address into bio*@q: the struct request_queue for the bio*@data: pointer to buffer to copy*@len: length in bytes*@gfp_mask: allocation flags for bio and page allocation*@reading: data direction is READ* copy the kernel address