blk_rq_append_bio

函数名称：Append a bio to a passthrough request. Only works if the bio can be merged* into the request based on the driver constraints.

函数原型：int blk_rq_append_bio(struct request *rq, struct bio **bio)

返回类型：int

参数：

类型	参数	名称
struct request *	rq
struct bio **	bio

20

orig_bio等于bio

23

nr_segs等于0

25

blk_queue_bounce(q, bio)

27

rate over multi-page bvec (bv, * bio, iter)

28

nr_segs自加

30

如果非bio则

31

blk_rq_bio_prep(rq, * bio, nr_segs)

32

否则

33

如果非ll_back_merge_fn(rq, * bio, nr_segs)则

34

如果orig_bio不等于bio则

35

_put - release a reference to a bio*@bio: bio to release reference to* Description:* Put a reference to a &struct bio, either one you have gotten with* bio_alloc, bio_get or bio_clone_*. The last put of a bio will free it.

36

bio等于orig_bio

38

返回:负EINVAL

41

request queue link 等于bio

42

biotail等于bio

43

total data len 加等于 residual I/O count

46

返回:0

**调用者**
名称	描述
__blk_rq_map_user_iov
blk_rq_map_kern	lk_rq_map_kern - map kernel data to a request, for passthrough requests@q: request queue where request should be inserted@rq: request to fill@kbuf: the kernel buffer@len: length of user data@gfp_mask: memory allocation flags Description:

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