io_uring/cmd: drop unused res2 param from io_uring_cmd_done()

Commit 79525b5 ("io_uring: fix nvme's 32b cqes on mixed cq") split
out a separate io_uring_cmd_done32() helper for ->uring_cmd()
implementations that return 32-byte CQEs. The res2 value passed to
io_uring_cmd_done() is now unused because __io_uring_cmd_done() ignores
it when is_cqe32 is passed as false. So drop the parameter from
io_uring_cmd_done() to simplify the callers and clarify that it's not
possible to return an extra value beyond the 32-bit CQE result.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: calebsander

block/ioctl.c

@@ -776,7 +776,7 @@ static void blk_cmd_complete(struct io_uring_cmd *cmd, unsigned int issue_flags)
 	if (bic->res == -EAGAIN && bic->nowait)
 		io_uring_cmd_issue_blocking(cmd);
 	else
-		io_uring_cmd_done(cmd, bic->res, 0, issue_flags);
+		io_uring_cmd_done(cmd, bic->res, issue_flags);
 }
 
 static void bio_cmd_bio_end_io(struct bio *bio)

drivers/block/ublk_drv.c

@@ -1188,7 +1188,7 @@ static void ublk_complete_io_cmd(struct ublk_io *io, struct request *req,
 	struct io_uring_cmd *cmd = __ublk_prep_compl_io_cmd(io, req);
 
 	/* tell ublksrv one io request is coming */
-	io_uring_cmd_done(cmd, res, 0, issue_flags);
+	io_uring_cmd_done(cmd, res, issue_flags);
 }
 
 #define UBLK_REQUEUE_DELAY_MS	3
@@ -1805,7 +1805,7 @@ static void ublk_cancel_cmd(struct ublk_queue *ubq, unsigned tag,
 	spin_unlock(&ubq->cancel_lock);
 
 	if (!done)
-		io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, 0, issue_flags);
+		io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, issue_flags);
 }
 
 /*
@@ -2452,7 +2452,7 @@ static void ublk_ch_uring_cmd_cb(struct io_uring_cmd *cmd,
 	int ret = ublk_ch_uring_cmd_local(cmd, issue_flags);
 
 	if (ret != -EIOCBQUEUED)
-		io_uring_cmd_done(cmd, ret, 0, issue_flags);
+		io_uring_cmd_done(cmd, ret, issue_flags);
 }
 
 static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)

fs/btrfs/ioctl.c

@@ -4685,7 +4685,7 @@ static void btrfs_uring_read_finished(struct io_uring_cmd *cmd, unsigned int iss
 	btrfs_unlock_extent(io_tree, priv->start, priv->lockend, &priv->cached_state);
 	btrfs_inode_unlock(inode, BTRFS_ILOCK_SHARED);
 
-	io_uring_cmd_done(cmd, ret, 0, issue_flags);
+	io_uring_cmd_done(cmd, ret, issue_flags);
 	add_rchar(current, ret);
 
 	for (index = 0; index < priv->nr_pages; index++)

fs/fuse/dev_uring.c

@@ -351,7 +351,7 @@ static void fuse_uring_entry_teardown(struct fuse_ring_ent *ent)
 	spin_unlock(&queue->lock);
 
 	if (cmd)
-		io_uring_cmd_done(cmd, -ENOTCONN, 0, IO_URING_F_UNLOCKED);
+		io_uring_cmd_done(cmd, -ENOTCONN, IO_URING_F_UNLOCKED);
 
 	if (req)
 		fuse_uring_stop_fuse_req_end(req);
@@ -518,7 +518,7 @@ static void fuse_uring_cancel(struct io_uring_cmd *cmd,
 
 	if (need_cmd_done) {
 		/* no queue lock to avoid lock order issues */
-		io_uring_cmd_done(cmd, -ENOTCONN, 0, issue_flags);
+		io_uring_cmd_done(cmd, -ENOTCONN, issue_flags);
 	}
 }
 
@@ -733,7 +733,7 @@ static int fuse_uring_send_next_to_ring(struct fuse_ring_ent *ent,
 	list_move_tail(&ent->list, &queue->ent_in_userspace);
 	spin_unlock(&queue->lock);
 
-	io_uring_cmd_done(cmd, 0, 0, issue_flags);
+	io_uring_cmd_done(cmd, 0, issue_flags);
 	return 0;
 }
 
@@ -1200,7 +1200,7 @@ static void fuse_uring_send(struct fuse_ring_ent *ent, struct io_uring_cmd *cmd,
 	ent->cmd = NULL;
 	spin_unlock(&queue->lock);
 
-	io_uring_cmd_done(cmd, ret, 0, issue_flags);
+	io_uring_cmd_done(cmd, ret, issue_flags);
 }
 
 /*

include/linux/io_uring/cmd.h

@@ -160,9 +160,9 @@ static inline void *io_uring_cmd_ctx_handle(struct io_uring_cmd *cmd)
 }
 
 static inline void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret,
-				     u64 res2, unsigned issue_flags)
+				     unsigned issue_flags)
 {
-	return __io_uring_cmd_done(ioucmd, ret, res2, issue_flags, false);
+	return __io_uring_cmd_done(ioucmd, ret, 0, issue_flags, false);
 }
 
 static inline void io_uring_cmd_done32(struct io_uring_cmd *ioucmd, s32 ret,