ioctl call with write more than 1MB fails

Hi All,

I m facing issue in sending write command with data >1Mb via ioctl .
Less than 1Mb it passes, but greater than 1Mb, command fails at the blk_rq_map_user (map user data to a request) with return status of -22.

Is this a limitation of the ioctl interface?

Kindly help me
Thanks in advance.

Any help would be of great helpful

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