From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12207] block reads/writes > 122880 bytes to USB tape drive gives EBUSY
Date: Tue, 23 Dec 2008 20:19:29 -0800 (PST)
Message-ID: <20081224041929.95F09108043@picon.linux-foundation.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=12207
------- Comment #17 from anonymous@kernel-bugs.osdl.org 2008-12-23 20:19 -------
Reply-To: fujita.tomonori@lab.ntt.co.jp
On Tue, 23 Dec 2008 18:56:21 -0800 (PST)
bugme-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=12207
>
>
>
>
>
> ------- Comment #16 from stern@rowland.harvard.edu 2008-12-23 18:56 -------
> USB is working fine, and the patch you proposed should take care of tape
> devices okay. However the block layer still limits max_sectors to
> BLK_DEF_MAX_SECTORS (see the code for blk_queue_max_sectors), which is defined
> as 1024. Thus there's no way to request a transfer of more than 512 KB, unless
> st.c does some fancy footwork.
st uses pc requests thus max_hw_sectors matters. st.c can use large
block sizes without any fancy footwork.
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