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.
Adapted to U-Boot by Stefan Roese.
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
Cc: Quentin Schulz <quentin.schulz@bootlin.com>
Cc: Boris Brezillon <boris.brezillon@bootlin.com>
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 94c8a98..a2ff1b5 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -162,6 +162,9 @@
if (!vol)
return -ENOMEM;
+ if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG)
+ vol->skip_check = 1;
+
spin_lock(&ubi->volumes_lock);
if (vol_id == UBI_VOL_NUM_AUTO) {
/* Find unused volume ID */
@@ -295,6 +298,10 @@
vtbl_rec.vol_type = UBI_VID_DYNAMIC;
else
vtbl_rec.vol_type = UBI_VID_STATIC;
+
+ if (vol->skip_check)
+ vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG;
+
memcpy(vtbl_rec.name, vol->name, vol->name_len);
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
@@ -738,6 +745,11 @@
ubi_err(ubi, "bad used_bytes");
goto fail;
}
+
+ if (vol->skip_check) {
+ ubi_err(ubi, "bad skip_check");
+ goto fail;
+ }
} else {
if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
ubi_err(ubi, "bad used_ebs");