bio_iov_iter_get_pages

函数名称：_iov_iter_get_pages - add user or kernel pages to a bio*@bio: bio to add pages to*@iter: iov iterator describing the region to be added* This takes either an iterator pointing to user memory, or one pointing to* kernel pages (BVEC iterator)

函数原型：int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)

返回类型：int

参数：

类型	参数	名称
struct bio *	bio
struct iov_iter *	iter

985

is_bvec等于iov_iter_is_bvec(iter)

988

如果WARN_ON_ONCE( how many bio_vec's )则返回:负EINVAL

991

992

如果is_bvec则ret等于__bio_iov_bvec_add_pages(bio, iter)

994

否则ret等于__bio_iov_iter_get_pages - pin user or kernel pages and add them to a bio*@bio: bio to add pages to*@iter: iov iterator describing the region to be mapped* Pins pages from *iter and appends them to @bio's bvec array. The

996

当非ret且iov_iter_count(iter)且非_full - check if the bio is full*@bio: bio to check*@len: length of one segment to be added* Return true if @bio is full and one segment with @len bytes can't be* added to the bio, otherwise return false 循环

998

如果is_bvec则bio_set_flag(bio, BIO_NO_PAGE_REF)

1000

返回:如果 how many bio_vec's 则0否则ret

**调用者**
名称	描述
__blkdev_direct_IO
iomap_dio_bio_actor

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码