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 10:54:43
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：io_write

函数原型：static int io_write(struct io_kiocb *req, struct io_kiocb **nxt, bool force_nonblock)

返回类型：int

参数：

类型参数名称
struct io_kiocb *req
struct io_kiocb **nxt
boolforce_nonblock
1915  iovec等于inline_vecs
1916  kiocb等于 NOTE: kiocb has the file as the first member, so don't do it here
1921  ret等于io_import_iovec(WRITE, req, & iovec, & iter)
1922  如果ret小于0则返回:ret
1926  如果非force_nonblock则ki_flags与等于IOCB_NOWAIT的反
1929  result等于0
1930  io_size等于ret
1931  如果flags按位与linked sqes 则result等于io_size
1938  如果force_nonblock且非If we tracked the file through the SCM inflight mechanism, we could support* any file. For now, just ensure that anything potentially problematic is done* inline.则
1939  flags或等于must be punted even for NONBLOCK
1940  转到:copy_iov
1944  如果force_nonblock且非ki_flags按位与IOCB_DIRECT的值且flags按位与gular file 则转到:copy_iov
1948  iov_count等于iov_iter_count( & iter)
1949  ret等于rw_verify_area(WRITE, file, & 文件偏移, iov_count)
1950  如果非ret则
1960  如果flags按位与gular file 则
1961  This is an internal function, please use sb_start_{write,pagefault,intwrite}* instead.
1963  __sb_writers_release(i_sb, SB_FREEZE_WRITE)
1966  ki_flags或等于IOCB_WRITE
1968  如果write_iter则ret2等于call_write_iter(file, kiocb, & iter)
1970  否则ret2等于For files that don't have ->read_iter() and ->write_iter(), handle them* by looping over ->read() or ->write() manually.
1976  如果ret2恒等于负EOPNOTSUPP且ki_flags按位与IOCB_NOWAIT则ret2等于负EAGAIN
1978  如果非force_nonblock或ret2不等于负EAGAIN则
1979  kiocb_done(kiocb, ret2, nxt, in_async)
1980  否则
1981  copy_iov :
1982  ret等于io_setup_async_rw(req, io_size, iovec, inline_vecs, & iter)
1984  如果ret则转到:out_free
1986  返回:负EAGAIN
1989  out_free :
1990  释放内存
1991  返回:ret
调用者
名称描述
io_issue_sqe