From: David Dillow <dillowda@ornl.gov>
Date: Thu, 20 Jan 2011 22:44:22 +0000 (-0800)
Subject: fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES in a bio
X-Git-Tag: v2.6.37.1~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=044b93a01aaf6450230cd5d006585eda1fe945a8;p=pandora-kernel.git

fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES in a bio

commit 20d9600cb407b0b55fef6ee814b60345c6f58264 upstream.

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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