[PATCH v4 0/2] ubi: add possibility to skip CRC check for static UBI volumes

From: Quentin Schulz
Date: Mon Jul 02 2018 - 04:34:03 EST

Some users of static UBI volumes implement their own integrity check, thus
making the volume CRC check done at open time useless. For instance, this
is the case when one use the ubiblock + dm-verity + squashfs combination,
where dm-verity already checks integrity of the block device but this time
at the block granularity instead of verifying the whole volume.

Skipping this test drastically improves the boot-time.

Patches for mtd-utils will be available as well.


- add a valid flags mask and check the given volume flag is valid when
doing verify_mkvol_req(),

- fix a few typos,

- use volume flags instead of arguments on the kernel command line as
suggested by Richard,

Quentin Schulz (2):
ubi: provide a way to skip CRC checks
ubi: expose the volume CRC check skip flag

drivers/mtd/ubi/cdev.c | 7 +++++++
drivers/mtd/ubi/kapi.c | 2 +-
drivers/mtd/ubi/ubi-media.h | 6 ++++++
drivers/mtd/ubi/ubi.h | 4 ++++
drivers/mtd/ubi/vmt.c | 12 ++++++++++++
drivers/mtd/ubi/vtbl.c | 3 +++
include/uapi/mtd/ubi-user.h | 18 ++++++++++++++++--
7 files changed, 49 insertions(+), 3 deletions(-)

base-commit: 69877f06915f1c7a9f1704442993bcc12c13ace2
git-series 0.9.1