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List: linux-api
Subject: Re: [PATCH 0/6] Extended file stat system call
From: David Howells <dhowells () redhat ! com>
Date: 2012-05-10 9:51:38
Message-ID: 10044.1336643498 () redhat ! com
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Dave Chinner <david@fromorbit.com> wrote:
> st_blksize - file block size
> st_alloc_blksize - allocation block size/alignment
> st_small_io_size - IO size/alignment that avoids
> filesystem/page cache RMW
> st_preferred_io_size - preferred IO size for general
> usage.
> st_large_io_size - IO size/alignment for high
> bandwidth sequential IO
What is st_blksize here? Is it directly comparable (if such a thing is
possible) to st_blksize in struct stat? Or does st_preferred_io_size map to
the current st_blksize and your st_blksize map to actual media block size (and
if so, is that the same as st_alloc_blksize? - I presume st_alloc_blksize
must be a multiple of the media block size).
David
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