From: Jeff Dike <jdike@addtoit.com>
Date: Mon, 16 Jul 2007 06:38:58 +0000 (-0700)
Subject: uml: limit request size on COWed devices
X-Git-Tag: v2.6.23-rc1~978
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8619b86f20588c020b280e6f67a9b8712b1ee38a;p=pandora-kernel.git

uml: limit request size on COWed devices

COWed devices can't handle more than 32 (64 on x86_64) sectors in one request
due to the size of the bitmap being carried around in the io_thread_req.

Enforce that by telling the block layer not to put too many sectors in
requests to COWed devices.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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