From 20d9600cb407b0b55fef6ee814b60345c6f58264 Mon Sep 17 00:00:00 2001
From: David Dillow <dillowda@ornl.gov>
Date: Thu, 20 Jan 2011 14:44:22 -0800
Subject: [PATCH] fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES
 in a bio

When using devices that support max_segments > BIO_MAX_PAGES (256), direct
IO tries to allocate a bio with more pages than allowed, which leads to an
oops in dio_bio_alloc().  Clamp the request to the supported maximum, and
change dio_bio_alloc() to reflect that bio_alloc() will always return a
bio when called with __GFP_WAIT and a valid number of vectors.

[akpm@linux-foundation.org: remove redundant BUG_ON()]
Signed-off-by: David Dillow <dillowda@ornl.gov>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
Reading git-format-patch failed