releases/4.4.177/dm-fix-to_sector-for-32bit.patch

   1 From 0bdb50c531f7377a9da80d3ce2d61f389c84cb30 Mon Sep 17 00:00:00 2001
   2 From: NeilBrown <neil@brown.name>
   3 Date: Sun, 6 Jan 2019 21:06:25 +1100
   4 Subject: dm: fix to_sector() for 32bit
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 From: NeilBrown <neil@brown.name>
  10
  11 commit 0bdb50c531f7377a9da80d3ce2d61f389c84cb30 upstream.
  12
  13 A dm-raid array with devices larger than 4GB won't assemble on
  14 a 32 bit host since _check_data_dev_sectors() was added in 4.16.
  15 This is because to_sector() treats its argument as an "unsigned long"
  16 which is 32bits (4GB) on a 32bit host.  Using "unsigned long long"
  17 is more correct.
  18
  19 Kernels as early as 4.2 can have other problems due to to_sector()
  20 being used on the size of a device.
  21
  22 Fixes: 0cf4503174c1 ("dm raid: add support for the MD RAID0 personality")
  23 cc: stable@vger.kernel.org (v4.2+)
  24 Reported-and-tested-by: Guillaume Perréal <gperreal@free.fr>
  25 Signed-off-by: NeilBrown <neil@brown.name>
  26 Signed-off-by: Mike Snitzer <snitzer@redhat.com>
  27 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  28
  29 ---
  30  include/linux/device-mapper.h |    2 +-
  31  1 file changed, 1 insertion(+), 1 deletion(-)
  32
  33 --- a/include/linux/device-mapper.h
  34 +++ b/include/linux/device-mapper.h
  35 @@ -593,7 +593,7 @@ extern struct ratelimit_state dm_ratelim
  36   */
  37  #define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
  38
  39 -static inline sector_t to_sector(unsigned long n)
  40 +static inline sector_t to_sector(unsigned long long n)
  41  {
  42         return (n >> SECTOR_SHIFT);
  43  }