Reduce big message RPC allocations (#19390)

Use `ODirectPoolSmall` buffers for inline data in PutObject.

Add a separate call for inline data that will fetch a buffer for the inline data before unmarshal.

cmd/storage-datatypes.go

@@ -21,6 +21,8 @@ import (
 	"time"
 
 	"github.com/minio/minio/internal/crypto"
+	"github.com/minio/minio/internal/grid"
+	xioutil "github.com/minio/minio/internal/ioutil"
 )
 
 //go:generate msgp -file=$GOFILE
@@ -433,6 +435,27 @@ type RenameDataHandlerParams struct {
 	Opts      RenameOptions `msg:"ro"`
 }
 
+// RenameDataInlineHandlerParams are parameters for RenameDataHandler with a buffer for inline data.
+type RenameDataInlineHandlerParams struct {
+	RenameDataHandlerParams `msg:"p"`
+}
+
+func newRenameDataInlineHandlerParams() *RenameDataInlineHandlerParams {
+	buf := grid.GetByteBufferCap(32 + 16<<10)
+	return &RenameDataInlineHandlerParams{RenameDataHandlerParams{FI: FileInfo{Data: buf[:0]}}}
+}
+
+// Recycle will reuse the memory allocated for the FileInfo data.
+func (r *RenameDataInlineHandlerParams) Recycle() {
+	if r == nil {
+		return
+	}
+	if cap(r.FI.Data) >= xioutil.BlockSizeSmall {
+		grid.PutByteBuffer(r.FI.Data)
+		r.FI.Data = nil
+	}
+}
+
 // RenameFileHandlerParams are parameters for RenameFileHandler.
 type RenameFileHandlerParams struct {
 	DiskID      string `msg:"id"`