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 10:31:22
Last Modify:2020-03-18 10:18:51 Copyright©Brick
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函数名称：new_sync_write

函数原型：static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)

返回类型：ssize_t

参数：

类型参数名称
struct file *filp
const char __user *buf
size_tlen
loff_t *ppos
474  struct iovec iov = { BSD uses caddr_t (1003.1g requires void *) = (void __user * )buf, Must be size_t (1003.1g) = len}
479  init_sync_kiocb( & kiocb, filp)
480  文件偏移等于如果ppos则ppos否则0
481  iov_iter_init( & iter, WRITE, & iov, 1, len)
483  ret等于call_write_iter(filp, & kiocb, & iter)
484  BUG_ON(ret == - cb queued, will get completion event )
485  如果ret大于0且ppos则ppos等于文件偏移
487  返回:ret
调用者
名称描述
__vfs_write