rbd: set max_segments to USHRT_MAX
authorIlya Dryomov <idryomov@gmail.com>
Thu, 21 Dec 2017 14:35:11 +0000 (15:35 +0100)
committerIlya Dryomov <idryomov@gmail.com>
Tue, 9 Jan 2018 16:40:48 +0000 (17:40 +0100)
commit21acdf45f4958135940f0b4767185cf911d4b010
tree237bd2ed3d14ea13bef18f86874023c0c23893cc
parentedd8ca8015800b354453b891d38960f3a474b7e4
rbd: set max_segments to USHRT_MAX

Commit d3834fefcfe5 ("rbd: bump queue_max_segments") bumped
max_segments (unsigned short) to max_hw_sectors (unsigned int).
max_hw_sectors is set to the number of 512-byte sectors in an object
and overflows unsigned short for 32M (largest possible) objects, making
the block layer resort to handing us single segment (i.e. single page
or even smaller) bios in that case.

Cc: stable@vger.kernel.org
Fixes: d3834fefcfe5 ("rbd: bump queue_max_segments")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
drivers/block/rbd.c