Mysterious fs ioctl

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Trying to track down this failing ioctl (on a file opened O_DIRECT):

strace showed:

 ioctl(4, _IOC(_IOC_WRITE, 0x95, 0x2, 0x4), 0x7ffe5b491664) = -1
ENOTTY  (Inappropriate ioctl for device)

I could find ioctls for 0x94 but not 0x95 in kernel source ... any
idea what ioctl
   _IOC_WRITE, 0x95, 0x2, 0x4)
is?

Wanted to make sure cifs.ko wasn't missing handling some important
ioctl for O_DIRECT workloads ...



-- 
Thanks,

Steve



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