On 6/8/21 1:10 PM, Bjørn Mork wrote:
Tested-by: Bjørn Mork <bj...@mork.no>Unrelated, but confused the hell out of me: I tested this by sysupgrading from a master based installation using a 5.10 kernel. And ended up with a tmpfs overlay because of: [ 9.833676] UBIFS (ubi0:1): Mounting in unauthenticated mode [ 9.845003] UBIFS error (ubi0:1 pid 561): ubifs_mount: 'compressor "zstd" is not compiled in [ 9.862780] mount_root: failed to mount -t ubifs /dev/ubi0_1 /tmp/overlay: No error information [ 9.880490] mount_root: overlay filesystem has not been fully initialized yet [ 9.895085] mount_root: switching to ubifs overlay [ 9.904741] mount_root: switching to ubifs failed - fallback to ramoverlay So I reinstalled the 21.02 build by sysupgrading from the running 21.02, and everything was fine again - as expected. I realize that I did this to myself, and that this sort of downgrade using sysupgrade is a pretty weird usecase. But maybe there are other similar situations where we can end up with an unmountable UBIFS due to the missing compressor? The problem seems to be as simple as CONFIG_UBIFS_FS_ZSTD being undefined in target/linux/generic/config-5.4 in 21.02. It is defined for a number of targets, though. Just not ralink. This was fixed in master by commit be7b56027899 ("kernel: enable lzo, zlib and zstd in ubifs"). Obvious candidate for backport to 21.02?
This problem should affect the following targets: target/linux/apm821xx/nand target/linux/ath79/mikrotik target/linux/ath79/nand target/linux/kirkwood target/linux/lantiq/xway target/linux/mediatek/mt7622 target/linux/mvebu target/linux/oxnas/ox820 target/linux/ramips/mt7621 They all have CONFIG_UBIFS_FS set, but not CONFIG_UBIFS_FS_ZSTD.OpenWrt 21.02 uses UBIFS_COMPR_LZO by default OpenWrt master uses UBIFS_COMPR_ZSTD by default.
Downgrading a OpenWrt 21.02 installation to 19.07 should work.Did someone check how much bigger the images are getting with CONFIG_UBIFS_FS_ZSTD?
If they are not so much bigger I would suggest to add CONFIG_UBIFS_FS_ZSTD to OpenWrt 21.02 then the downgrade from master should work.
Hauke
OpenPGP_0x93DD20630910B515.asc
Description: OpenPGP public key
OpenPGP_signature
Description: OpenPGP digital signature
_______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
