linux-ext4 - Re: [PATCH v4 1/9] statx: add direct I/O alignment information

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Message-ID: <yq1fsitjbqn.fsf@ca-mkp.ca.oracle.com>
Date:   Fri, 22 Jul 2022 13:31:37 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        linux-api@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v4 1/9] statx: add direct I/O alignment information


Eric,

> 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.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering