linux-ext4 - Max size of data in a bio

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Message-ID: <CAFd8dNswTyL=7VDRfZy2o0ALFJH+8iA5d4SaY4+Ap87u-JjE1Q@mail.gmail.com>
Date:	Fri, 20 Sep 2013 15:27:25 +0530
From:	Prashant Shah <pshah.me@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Max size of data in a bio

Hi,

What is the maximum size of the data that can be read/written in a
single bio ? I could locate two possible locations where I can
calculate that :

1.
#define BIO_MAX_PAGES        256
#define BIO_MAX_SIZE        (BIO_MAX_PAGES << PAGE_CACHE_SHIFT)
#define BIO_MAX_SECTORS        (BIO_MAX_SIZE >> 9)

Max = 1048576

2.
#define UIO_MAXIOV      1024

Max = 4194304

Is there any other way that the bio could have been created that is
reading/writing data in a larger size than any of the above ?

Regards.
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