[PATCH v3 5/5] btrfs: drop unused uring encoded IO REISSUE stash helpers

After not keeping state across -EAGAIN, restoring bc->data on REISSUE is
dead.  Remove it, stop using the cmd PDU on the write path, and fold the
read -EAGAIN check into the existing error path.

Signed-off-by: Yang Xiuwei <[email protected]>
---
 fs/btrfs/ioctl.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a3ca15901cde..2ac2d51d564d 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4700,9 +4700,6 @@ static int btrfs_uring_encoded_read(struct io_uring_cmd *cmd, unsigned int issue
 	struct io_btrfs_cmd *bc = io_uring_cmd_to_pdu(cmd, struct io_btrfs_cmd);
 	struct btrfs_uring_encoded_data *data = NULL;
 
-	if (cmd->flags & IORING_URING_CMD_REISSUE)
-		data = bc->data;
-
 	if (!capable(CAP_SYS_ADMIN)) {
 		ret = -EPERM;
 		goto out_acct;
@@ -4784,8 +4781,6 @@ static int btrfs_uring_encoded_read(struct io_uring_cmd *cmd, unsigned int issue
 
 	ret = btrfs_encoded_read(&kiocb, &data->iter, &data->args, &cached_state,
 				 &disk_bytenr, &disk_io_size);
-	if (ret == -EAGAIN)
-		goto out_free;
 	if (ret < 0 && ret != -EIOCBQUEUED)
 		goto out_free;
 
@@ -4842,12 +4837,8 @@ static int btrfs_uring_encoded_write(struct io_uring_cmd *cmd, unsigned int issu
 	struct kiocb kiocb;
 	ssize_t ret;
 	void __user *sqe_addr;
-	struct io_btrfs_cmd *bc = io_uring_cmd_to_pdu(cmd, struct io_btrfs_cmd);
 	struct btrfs_uring_encoded_data *data = NULL;
 
-	if (cmd->flags & IORING_URING_CMD_REISSUE)
-		data = bc->data;
-
 	if (!capable(CAP_SYS_ADMIN)) {
 		ret = -EPERM;
 		goto out_acct;
@@ -4871,8 +4862,6 @@ static int btrfs_uring_encoded_write(struct io_uring_cmd *cmd, unsigned int issu
 			goto out_acct;
 		}
 
-		bc->data = data;
-
 		if (issue_flags & IO_URING_F_COMPAT) {
 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
 			struct btrfs_ioctl_encoded_io_args_32 args32;
@@ -4958,7 +4947,6 @@ static int btrfs_uring_encoded_write(struct io_uring_cmd *cmd, unsigned int issu
 	inc_syscw(current);
 
 	kfree(data);
-	bc->data = NULL;
 	return ret;
 }
 
-- 
2.25.1