函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\io_uring.c Create Date:2022-07-29 10:54:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：io_do_iopoll

函数原型：static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, long min)

返回类型：int

参数：

类型参数名称
struct io_ring_ctx *ctx
unsigned int *nr_events
longmin
1203  LIST_HEAD(done)
1211  spin等于非poll_multi_file且nr_events小于min
1213  ret等于0
1215  kiocb等于 NOTE: kiocb has the file as the first member, so don't do it here
1222  如果flags按位与polled IO has completed 则
1223  链表项移动到尾部
1224  继续下一循环
1226  如果非链表为空则退出
1229  ret等于iopoll(kiocb, spin)
1230  如果ret小于0则退出
1233  如果ret且spin则spin = false
1235  ret等于0
1238  如果非链表为空则Find and free completed poll iocbs
1241  返回:ret
调用者
名称描述
io_iopoll_geteventsPoll for a minimum of 'min' events. Note that if min == 0 we consider that a* non-spinning poll check - we'll still enter the driver poll loop, but only* as a non-spinning completion check.