4.9-stable review patch. If anyone has any objections, please let me know.
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From: NeilBrown neil@brown.name
commit 0bdb50c531f7377a9da80d3ce2d61f389c84cb30 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: 0cf4503174c1 ("dm raid: add support for the MD RAID0 personality") cc: stable@vger.kernel.org (v4.2+) Reported-and-tested-by: Guillaume Perréal gperreal@free.fr Signed-off-by: NeilBrown neil@brown.name Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/linux/device-mapper.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -627,7 +627,7 @@ extern struct ratelimit_state dm_ratelim */ #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); }