fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES in a bio
authorDavid Dillow <dillowda@ornl.gov>
Thu, 20 Jan 2011 22:44:22 +0000 (14:44 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 21 Jan 2011 01:02:05 +0000 (17:02 -0800)
commit20d9600cb407b0b55fef6ee814b60345c6f58264
treea023082339b33c55e8def552abecd441ffe92fb5
parent82478fb7bca28e3ca2f3c55c14e690f749dd4dbb
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>
fs/direct-io.c