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 10:54:31
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Returns true if there are no backlogged entries after the flush

函数原型：static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)

返回类型：bool

参数：

类型参数名称
struct io_ring_ctx *ctx
boolforce
766  rings等于rings
770  LIST_HEAD(list)
772  如果非force则
773  如果链表为空且不修改则返回:true
775  如果cached_cq_tail减READ_ONCE(head)恒等于Ring sizes (constant, power of 2) 则返回:false
780  spin_lock_irqsave( & completion_lock, flags)
783  如果force则cq_overflow_flushed = true
786  cqe = NULL
787  当非链表为空循环
788  cqe等于io_get_cqring(ctx)
789  如果非cqe且非force则退出
792  req等于list_first_entry - get the first element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.( & cq_overflow_list, structio_kiocb, list)
794  链表项移动到头部
795  如果cqe则
796  WRITE_ONCE(sqe->data submission passed back , user_data)
797  WRITE_ONCE(sult code for this event , result)
798  WRITE_ONCE(flags, 0)
799  否则
800  WRITE_ONCE(Number of completion events lost because the queue was full;* this should be avoided by the application by making sure* there are not more requests pending than there is space in* the completion queue.* Written by the kernel, shouldn't be modified by the, atomic_inc_return( & cached_cq_overflow))
805  io_commit_cqring(ctx)
806  spin_unlock_irqrestore( & completion_lock, flags)
807  io_cqring_ev_posted(ctx)
809  当非链表为空循环
810  req等于list_first_entry - get the first element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.( & list, structio_kiocb, list)
811  删除链表项
812  io_put_req(req)
815  返回:cqe != NULL
调用者
名称描述
io_cqring_events
io_submit_sqes
io_ring_ctx_wait_and_kill
SYSCALL_DEFINE6