smb on macos get [Errno 13] Permission denied <-- NT Status: STATUS_LOCK_NOT_GRANTED (0xc0000055)

Posted 2020-12-22 vivivi

NT Status: STATUS_LOCK_NOT_GRANTED (0xc0000055) No such file or directory. The file or directory name specified does not exist.
smb2.nt_status == 0xc0000055

发生在，当stream1 建立了一个fileid，并lock它：exclusive
然后 stream2 也create了一个fileid，想lock它时候：exclusive
得到了一个 error： NT Status: STATUS_LOCK_NOT_GRANTED (0xc0000055)

反应在上层： [Errno 13] Permission denied

另外，SMB抓包上，无ulock，都是lock request, 要看lock info来确定lock的内容：

Lock Info
    Length: 18446744073709551615
    Flags: 0x00000004, Unlock
        .... .... .... .... .... .... .... ...0 = Shared: False
        .... .... .... .... .... .... .... ..0. = Exclusive: False
        .... .... .... .... .... .... .... .1.. = Unlock: True
        .... .... .... .... .... .... ...0 .... = Fail Immediately: False
    Reserved: 00000000