io_uring: convert file system request types to use io_cmd_type

This converts statx, rename, unlink, mkdir, symlink, and hardlink to
use io_cmd_type.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -983,12 +983,6 @@ struct io_kiocb {
 		struct io_epoll		epoll;
 		struct io_splice	splice;
 		struct io_provide_buf	pbuf;
-		struct io_statx		statx;
-		struct io_rename	rename;
-		struct io_unlink	unlink;
-		struct io_mkdir		mkdir;
-		struct io_symlink	symlink;
-		struct io_hardlink	hardlink;
 		struct io_msg		msg;
 		struct io_xattr		xattr;
 		struct io_uring_cmd	uring_cmd;
@@ -4367,7 +4361,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
 static int io_renameat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {
-	struct io_rename *ren = &req->rename;
+	struct io_rename *ren = io_kiocb_to_cmd(req);
 	const char __user *oldf, *newf;
 
 	if (sqe->buf_index || sqe->splice_fd_in)
@@ -4397,7 +4391,7 @@ static int io_renameat_prep(struct io_kiocb *req,
 
 static int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_rename *ren = &req->rename;
+	struct io_rename *ren = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -4654,7 +4648,7 @@ static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
 static int io_unlinkat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {
-	struct io_unlink *un = &req->unlink;
+	struct io_unlink *un = io_kiocb_to_cmd(req);
 	const char __user *fname;
 
 	if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
@@ -4679,7 +4673,7 @@ static int io_unlinkat_prep(struct io_kiocb *req,
 
 static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_unlink *un = &req->unlink;
+	struct io_unlink *un = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -4698,7 +4692,7 @@ static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
 static int io_mkdirat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {
-	struct io_mkdir *mkd = &req->mkdir;
+	struct io_mkdir *mkd = io_kiocb_to_cmd(req);
 	const char __user *fname;
 
 	if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
@@ -4720,7 +4714,7 @@ static int io_mkdirat_prep(struct io_kiocb *req,
 
 static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_mkdir *mkd = &req->mkdir;
+	struct io_mkdir *mkd = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -4736,7 +4730,7 @@ static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
 static int io_symlinkat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {
-	struct io_symlink *sl = &req->symlink;
+	struct io_symlink *sl = io_kiocb_to_cmd(req);
 	const char __user *oldpath, *newpath;
 
 	if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
@@ -4764,7 +4758,7 @@ static int io_symlinkat_prep(struct io_kiocb *req,
 
 static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_symlink *sl = &req->symlink;
+	struct io_symlink *sl = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -4780,7 +4774,7 @@ static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
 static int io_linkat_prep(struct io_kiocb *req,
 			    const struct io_uring_sqe *sqe)
 {
-	struct io_hardlink *lnk = &req->hardlink;
+	struct io_hardlink *lnk = io_kiocb_to_cmd(req);
 	const char __user *oldf, *newf;
 
 	if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
@@ -4810,7 +4804,7 @@ static int io_linkat_prep(struct io_kiocb *req,
 
 static int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_hardlink *lnk = &req->hardlink;
+	struct io_hardlink *lnk = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -5696,6 +5690,7 @@ static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
 
 static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
+	struct io_statx *sx = io_kiocb_to_cmd(req);
 	const char __user *path;
 
 	if (sqe->buf_index || sqe->splice_fd_in)
@@ -5703,20 +5698,20 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (req->flags & REQ_F_FIXED_FILE)
 		return -EBADF;
 
-	req->statx.dfd = READ_ONCE(sqe->fd);
-	req->statx.mask = READ_ONCE(sqe->len);
+	sx->dfd = READ_ONCE(sqe->fd);
+	sx->mask = READ_ONCE(sqe->len);
 	path = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
-	req->statx.flags = READ_ONCE(sqe->statx_flags);
+	sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+	sx->flags = READ_ONCE(sqe->statx_flags);
 
-	req->statx.filename = getname_flags(path,
-					getname_statx_lookup_flags(req->statx.flags),
+	sx->filename = getname_flags(path,
+				     getname_statx_lookup_flags(sx->flags),
 				     NULL);
 
-	if (IS_ERR(req->statx.filename)) {
-		int ret = PTR_ERR(req->statx.filename);
+	if (IS_ERR(sx->filename)) {
+		int ret = PTR_ERR(sx->filename);
 
-		req->statx.filename = NULL;
+		sx->filename = NULL;
 		return ret;
 	}
 
@@ -5726,14 +5721,13 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 static int io_statx(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct io_statx *ctx = &req->statx;
+	struct io_statx *sx = io_kiocb_to_cmd(req);
 	int ret;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		return -EAGAIN;
 
-	ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask,
-		       ctx->buffer);
+	ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
 	io_req_complete(req, ret);
 	return 0;
 }
@@ -7994,28 +7988,46 @@ static void io_clean_op(struct io_kiocb *req)
 				putname(open->filename);
 			break;
 			}
-		case IORING_OP_RENAMEAT:
-			putname(req->rename.oldpath);
-			putname(req->rename.newpath);
+		case IORING_OP_RENAMEAT: {
+			struct io_rename *ren = io_kiocb_to_cmd(req);
+
+			putname(ren->oldpath);
+			putname(ren->newpath);
 			break;
-		case IORING_OP_UNLINKAT:
-			putname(req->unlink.filename);
+			}
+		case IORING_OP_UNLINKAT: {
+			struct io_unlink *ul = io_kiocb_to_cmd(req);
+
+			putname(ul->filename);
 			break;
-		case IORING_OP_MKDIRAT:
-			putname(req->mkdir.filename);
+			}
+		case IORING_OP_MKDIRAT: {
+			struct io_mkdir *md = io_kiocb_to_cmd(req);
+
+			putname(md->filename);
 			break;
-		case IORING_OP_SYMLINKAT:
-			putname(req->symlink.oldpath);
-			putname(req->symlink.newpath);
+			}
+		case IORING_OP_SYMLINKAT: {
+			struct io_symlink *sl = io_kiocb_to_cmd(req);
+
+			putname(sl->oldpath);
+			putname(sl->newpath);
 			break;
-		case IORING_OP_LINKAT:
-			putname(req->hardlink.oldpath);
-			putname(req->hardlink.newpath);
+			}
+		case IORING_OP_LINKAT: {
+			struct io_hardlink *hl = io_kiocb_to_cmd(req);
+
+			putname(hl->oldpath);
+			putname(hl->newpath);
 			break;
-		case IORING_OP_STATX:
-			if (req->statx.filename)
-				putname(req->statx.filename);
+			}
+		case IORING_OP_STATX: {
+			struct io_statx *sx = io_kiocb_to_cmd(req);
+
+			if (sx->filename)
+				putname(sx->filename);
 			break;
+			}
 		case IORING_OP_SETXATTR:
 		case IORING_OP_FSETXATTR:
 		case IORING_OP_GETXATTR: