]> git.karo-electronics.de Git - karo-tx-linux.git/commit
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)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 17 Feb 2011 22:47:22 +0000 (14:47 -0800)
commited8f1a28a0fbe533047de331ae97b87ee1903828
treeaeb6f620507e9f1e774a6bf713f348094965223e
parent4e3e37b58d6cba97d9d9f5d9532d587030fcc648
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>
fs/direct-io.c