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authorPaul Moore <paul@paul-moore.com>2022-08-19 23:20:33 +0300
committerPaul Moore <paul@paul-moore.com>2022-08-26 18:19:44 +0300
commit707527956d90ea4f304188555a97144183af1e49 (patch)
tree5a860333802cfad5088c30483a9e3e9672fafb64 /drivers/char/mem.c
parentf4d653dcaa4e4056e1630423e6a8ece4869b544f (diff)
downloadlinux-707527956d90ea4f304188555a97144183af1e49.tar.xz
/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>
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 84ca98ed1dad..32a932a065a6 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -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 = {