函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\splice.c Create Date:2022-07-29 10:42:14
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：iter_to_pipe

函数原型：static int iter_to_pipe(struct iov_iter *from, struct pipe_inode_info *pipe, unsigned flags)

返回类型：int

参数：

类型参数名称
struct iov_iter *from
struct pipe_inode_info *pipe
unsignedflags
1225  struct pipe_buffer buf = {ops = & user_page_pipe_buf_ops, flags = flags}
1229  total等于0
1230  ret等于0
1231  bool failed = false
1233  当iov_iter_count(from)且非failed循环
1239  copied等于iov_iter_get_pages(from, pages, ~0UL, 16, & start)
1240  如果copied小于等于0则
1241  ret等于copied
1242  退出
1245  以copied循环
1246  size等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(int, copied, PAGE_SIZE - start)
1247  如果非failed则
1248  page等于pages[n]
1249  offset等于start
1250  len等于size
1251  ret等于add_to_pipe(pipe, & buf)
1252  如果此条件成立可能性小(为编译器优化)(ret < 0)则
1253  failed = true
1254  否则
1255  iov_iter_advance(from, ret)
1256  total加等于ret
1258  否则
1261  copied减等于size
1264  返回:如果total则total否则ret
调用者
名称描述
vmsplice_to_pipevmsplice splices a user address range into a pipe. It can be thought of* as splice-from-memory, where the regular splice is splice-from-file (or* to file). In both cases the output is a pipe, naturally.