Commit 70752795 authored by Paul Moore's avatar Paul Moore
Browse files

/dev/null: add IORING_OP_URING_CMD support 



This patch adds support for the io_uring command pass through, aka
IORING_OP_URING_CMD, to the /dev/null driver.  As with all of the
/dev/null functionality, the implementation is just a simple sink
where commands go to die, but it should be useful for developers who
need a simple IORING_OP_URING_CMD test device that doesn't require
any special hardware.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent f4d653dc

drivers/char/mem.c

+6 −0
Original line number Diff line number Diff line
@@ -480,6 +480,11 @@ static ssize_t splice_write_null(struct pipe_inode_info *pipe, struct file *out, 
	return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);

}



static int uring_cmd_null(struct io_uring_cmd *ioucmd, unsigned int issue_flags)

{

	return 0;

}



static ssize_t read_iter_zero(struct kiocb *iocb, struct iov_iter *iter)

{

	size_t written = 0;
@@ -663,6 +668,7 @@ static const struct file_operations null_fops = { 
	.read_iter	= read_iter_null,

	.write_iter	= write_iter_null,

	.splice_write	= splice_write_null,

	.uring_cmd	= uring_cmd_null,

};



static const struct file_operations __maybe_unused port_fops = {