hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

/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: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2022-08-19 16:20:33 -04:00
parent f4d653dcaa
commit 707527956d
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/char/mem.c
View File

@ -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 = {