dm: mark targets that pass integrity data
authorMikulas Patocka <mpatocka@redhat.com>
Tue, 18 Apr 2017 20:51:48 +0000 (16:51 -0400)
committerMike Snitzer <snitzer@redhat.com>
Mon, 24 Apr 2017 16:04:32 +0000 (12:04 -0400)
commite2460f2a4bc740fae9e23f14d653cf53e90b3f9a
tree61cf54345c7bca5844099f29abf0aa7da53135e8
parent3c12016910061c2a19d985fba7f7dec19d6a3a09
dm: mark targets that pass integrity data

A dm-crypt on dm-integrity device incorrectly advertises an integrity
profile on the DM crypt device.  It can be seen in the files
"/sys/block/dm-*/integrity/*" that both dm-integrity and dm-crypt target
advertise the integrity profile.  That is incorrect, only the
dm-integrity target should advertise the integrity profile.

A general problem in DM is that if we have a DM device that depends on
another device with an integrity profile, the upper device will always
advertise the integrity profile, even when the target driver doesn't
support handling integrity data.

Most targets don't support integrity data, so we provide a whitelist of
targets that support it (linear, delay and striped).  The targets that
support passing integrity data to the lower device are marked with the
flag DM_TARGET_PASSES_INTEGRITY.  The DM core will now advertise
integrity data on a DM device only if all the targets support the
integrity data.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-delay.c
drivers/md/dm-linear.c
drivers/md/dm-stripe.c
drivers/md/dm-table.c
drivers/md/dm.c
include/linux/device-mapper.h