diff options
| author | Quentin Schulz <quentin.schulz@bootlin.com> | 2018-07-02 11:43:50 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2018-08-15 00:25:20 +0200 |
| commit | 62652517753f3cdddce10935139cfa6e00f8da33 (patch) | |
| tree | b0c59fcc4883e94a9f7dd6a68838e28d6bae827c /drivers/mtd/ubi/ubi-media.h | |
| parent | a3d218280c273f298b0a17902bc2b4aa3f1dae06 (diff) | |
ubi: provide a way to skip CRC checks
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.
Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd/ubi/ubi-media.h')
| -rw-r--r-- | drivers/mtd/ubi/ubi-media.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h index 195ff8ca8211..b5fe8f82281b 100644 --- a/drivers/mtd/ubi/ubi-media.h +++ b/drivers/mtd/ubi/ubi-media.h @@ -45,6 +45,11 @@ enum { * Volume flags used in the volume table record. * * @UBI_VTBL_AUTORESIZE_FLG: auto-resize this volume + * @UBI_VTBL_SKIP_CRC_CHECK_FLG: skip the CRC check done on a static volume at + * open time. Should only be set on volumes that + * are used by upper layers doing this kind of + * check. Main use-case for this flag is + * boot-time reduction * * %UBI_VTBL_AUTORESIZE_FLG flag can be set only for one volume in the volume * table. UBI automatically re-sizes the volume which has this flag and makes @@ -76,6 +81,7 @@ enum { */ enum { UBI_VTBL_AUTORESIZE_FLG = 0x01, + UBI_VTBL_SKIP_CRC_CHECK_FLG = 0x02, }; /* |