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Date:   Fri, 22 Jul 2022 13:31:37 -0400
From:   "Martin K. Petersen" <>
To:     Eric Biggers <>
        Keith Busch <>, Christoph Hellwig <>
Subject: Re: [PATCH v4 1/9] statx: add direct I/O alignment information


> Therefore, let's expose this information via statx().  Add the
> STATX_DIOALIGN flag and two new statx fields associated with it:
> * stx_dio_mem_align: the alignment (in bytes) required for user memory
>   buffers for DIO, or 0 if DIO is not supported on the file.
> * stx_dio_offset_align: the alignment (in bytes) required for file
>   offsets and I/O segment lengths for DIO, or 0 if DIO is not supported
>   on the file.  This will only be nonzero if stx_dio_mem_align is
>   nonzero, and vice versa.

Nice to finally have a generic interface for this!

Reviewed-by: Martin K. Petersen <>

Martin K. Petersen	Oracle Linux Engineering

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