函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\blk-core.c Create Date:2022-07-27 18:35:20
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：generic_make_request - hand a buffer to its device driver for I/O*@bio: The bio describing the location in memory and on the device.* generic_make_request() is used to make I/O requests of block* devices

函数原型：blk_qc_t generic_make_request(struct bio *bio)

返回类型：blk_qc_t

参数：

类型参数名称
struct bio *bio
1021  ret等于BLK_QC_T_NONE
1023  如果非generic_make_request_checks(bio)则转到:out
1036  如果bio_list则
1037  bio_list_add( & bio_list[0], bio)
1038  转到:out
1055  BUG_ON( request queue link )
1056  bio_list_init( & bio_list_on_stack[0])
1057  bio_list等于bio_list_on_stack
1058  循环
1059  q等于queue
1060  flags等于如果 bottom bits req flags, * top bits REQ_OP. Use * accessors.按位与REQ_NOWAIT则BLK_MQ_REQ_NOWAIT否则0
1063  如果此条件成立可能性大(为编译器优化)(lk_queue_enter() - try to increase q->q_usage_counter*@q: request queue pointer*@flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT == 0)则
1067  bio_list_on_stack[1]等于bio_list_on_stack[0]
1068  bio_list_init( & bio_list_on_stack[0])
1069  ret等于make_request_fn(q, bio)
1071  blk_queue_exit(q)
1076  bio_list_init( & lower)
1077  bio_list_init( & same)
1078  当((bio = bio_list_pop( & bio_list_on_stack[0])) != NULL)循环
1079  如果q恒等于queue则bio_list_add( & same, bio)
1081  否则bio_list_add( & lower, bio)
1084  bio_list_merge( & bio_list_on_stack[0], & lower)
1085  bio_list_merge( & bio_list_on_stack[0], & same)
1086  bio_list_merge( & bio_list_on_stack[0], & bio_list_on_stack[1])
1087  否则
1088  如果此条件成立可能性小(为编译器优化)(!blk_queue_dying(q) && ( bottom bits req flags, * top bits REQ_OP. Use * accessors. & REQ_NOWAIT))则bio_wouldblock_error(bio)
1091  否则bio_io_error(bio)
1094  bio等于bio_list_pop( & bio_list_on_stack[0])
1095  当bio循环
1096  bio_list = NULL
1098  out :
1099  返回:ret
调用者
名称描述
submit_biosubmit_bio - submit a bio to the block device layer for I/O*@bio: The &struct bio which describes the I/O* submit_bio() is very similar in purpose to generic_make_request(), and* uses that function to do most of the work. Both are fairly rough
__blk_queue_split__blk_queue_split - split a bio and submit the second half*@q: [in] request queue pointer*@bio: [in, out] bio to be split*@nr_segs: [out] number of segments in the first bio* Split a bio into two bios, chain the two bios, submit the second half and
__blk_queue_bounce
blk_throtl_dispatch_work_fnlk_throtl_dispatch_work_fn - work function for throtl_data->dispatch_work*@work: work item being executed* This function is queued for execution when bio's reach the bio_lists[]* of throtl_data->service_queue. Those bio's are ready and issued by this
blk_throtl_drainlk_throtl_drain - drain throttled bios*@q: request_queue to drain throttled bios for* Dispatch all currently throttled bios on @q through ->make_request_fn().