Commit 7668d6e4 authored by NeilBrown's avatar NeilBrown Committed by Greg Kroah-Hartman

dm: fix to_sector() for 32bit

commit 0bdb50c5 upstream.

A dm-raid array with devices larger than 4GB won't assemble on
a 32 bit host since _check_data_dev_sectors() was added in 4.16.
This is because to_sector() treats its argument as an "unsigned long"
which is 32bits (4GB) on a 32bit host.  Using "unsigned long long"
is more correct.

Kernels as early as 4.2 can have other problems due to to_sector()
being used on the size of a device.

Fixes: 0cf45031 ("dm raid: add support for the MD RAID0 personality")
cc: stable@vger.kernel.org (v4.2+)
Reported-and-tested-by: default avatarGuillaume Perréal <gperreal@free.fr>
Signed-off-by: default avatarNeilBrown <neil@brown.name>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a441fdaf
...@@ -601,7 +601,7 @@ do { \ ...@@ -601,7 +601,7 @@ do { \
*/ */
#define dm_target_offset(ti, sector) ((sector) - (ti)->begin) #define dm_target_offset(ti, sector) ((sector) - (ti)->begin)
static inline sector_t to_sector(unsigned long n) static inline sector_t to_sector(unsigned long long n)
{ {
return (n >> SECTOR_SHIFT); return (n >> SECTOR_SHIFT);
} }
......
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