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 10:42:09
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：splice_from_pipe_feed - feed available data from a pipe to a file*@pipe: pipe to splice from*@sd: information to @actor*@actor: handler that splices the data* Description:* This function loops over the pipe and calls @actor to do the* actual moving of a

函数原型：static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_desc *sd, splice_actor *actor)

返回类型：int

参数：

类型参数名称
struct pipe_inode_info *pipe
struct splice_desc *sd
splice_actor *actor
493  head等于head
494  tail等于tail
495  mask等于ring_size减1
498  当非pipe_empty - Return true if the pipe is empty*@head: The pipe ring head pointer*@tail: The pipe ring tail pointer循环
499  buf等于bufs[tail & mask]
501  current length 等于len
502  如果current length 大于maining length 则current length 等于maining length
505  ret等于pipe_buf_confirm - verify contents of the pipe buffer*@pipe: the pipe that the buffer belongs to*@buf: the buffer to confirm
506  如果此条件成立可能性小(为编译器优化)(ret)则
507  如果ret恒等于负ENODATA则ret等于0
509  返回:ret
512  ret等于actor(pipe, buf, sd)
513  如果ret小于等于0则返回:ret
516  offset加等于ret
517  len减等于ret
519  umber of bytes already spliced 加等于ret
520  current length 减等于ret
521  le position 加等于ret
522  maining length 减等于ret
524  如果非len则
525  pipe_buf_release - put a reference to a pipe_buffer*@pipe: the pipe that the buffer belongs to*@buf: the buffer to put a reference to
526  tail自加
527  tail等于tail
528  如果files则d to wake up writer = true
532  如果非maining length 则返回:0
536  返回:1
调用者
名称描述
__splice_from_pipe__splice_from_pipe - splice data from a pipe to given actor*@pipe: pipe to splice from*@sd: information to @actor*@actor: handler that splices the data* Description:* This function does little more than loop over the pipe and call*@actor to do the actual