I found that name strings of SMB2_CREATE_ALLOCATION_SIZE are different between samba and cifs/ksmbd like the following. In the MS-SMB2 specification, the name of SMB2_CREATE_ALLOCATION_SIZE is defined as AISi. Is it a typo in the specification or is samba defining it incorrectly? samba-4.19.2/libcli/smb/smb2_constants.h : #define SMB2_CREATE_TAG_ALSI "AlSi" /fs/smb/common/smb2pdu.h : #define SMB2_CREATE_ALLOCATION_SIZE "AISi" Thanks.