函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\read_write.c Create Date:2022-07-29 10:31:24
Last Modify:2020-03-18 10:18:51 Copyright©Brick
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函数名称：Do it by hand, with file-ops

函数原型：static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, loff_t *ppos, int type, rwf_t flags)

返回类型：ssize_t

参数：

类型参数名称
struct file *filp
struct iov_iter *iter
loff_t *ppos
inttype
rwf_tflags
704  ret等于0
706  如果flags按位与high priority request, poll if possible 的反则返回:负EOPNOTSUPP
709  当iov_iter_count(iter)循环
710  iovec等于iov_iter_iovec(iter)
713  如果type恒等于generic data direction definitions 则
714  nr等于read(filp, BSD uses caddr_t (1003.1g requires void *) , Must be size_t (1003.1g) , ppos)
716  否则
717  nr等于write(filp, BSD uses caddr_t (1003.1g requires void *) , Must be size_t (1003.1g) , ppos)
721  如果nr小于0则
722  如果非ret则ret等于nr
724  退出
726  ret加等于nr
727  如果nr不等于 Must be size_t (1003.1g) 则退出
729  iov_iter_advance(iter, nr)
732  返回:ret
调用者
名称描述
do_iter_read
do_iter_write