bio_add_page

函数名称：_add_page - attempt to add page(s) to bio*@bio: destination bio*@page: start page to add*@len: vec entry length, may cross pages*@offset: vec entry offset relative to @page, may cross pages* Attempt to add page(s) to the bio_vec maplist

函数原型：int bio_add_page(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 bio *	bio
struct page *	page
unsigned int	len
unsigned int	offset

**调用者**
名称	描述
__bio_iov_bvec_add_pages
__blkdev_issue_zero_pages
dio_bio_add_page	Attempt to put the current chunk of 'cur_page' into the current BIO. If* that was successful then update final_block_in_bio and take a ref against* the just-added page.* Return zero on success. Non-zero means the caller needs to start a new BIO.
do_mpage_readpage	This is the worker routine which does all the work of mapping the disk* blocks and constructs largest possible bios, submits them for IO if the* blocks are not contiguous on the disk
__mpage_writepage
fscrypt_zeroout_range
iomap_readpage_actor
iomap_add_to_ioend	Test to see if we have an existing ioend structure that we could append to* first, otherwise finish off the current ioend and start another.
hib_submit_io

函数逻辑报告