On Wed, 21 Jul 2021 at 22:40, Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: > > > > > > Try to set up dm-verity with block size 512 bytes. > > > > > > I don't know what block size does squashfs use, but if the filesystem > > > block size is smaller than dm-verity block size, it doesn't work. > > > > > Okay thank you so much for this clue, > > It seems we are using 65536 as the squashfs block size: > > 65536 is the compression block size - it is unrelated to I/O block size. > > There's a config option SQUASHFS_4K_DEVBLK_SIZE. The documentation says > that it uses by default 1K block size and if you enable this option, it > uses 4K block size. > Okay it seems this config is set in our case: CONFIG_SQUASHFS_4K_DEVBLK_SIZE=y So, with this the squashfs and dm-verity block size exactly matches (4K) > So, try to set it. Or try to reduce dm-verity block size down to 1K. > Okay we are trying this. Thank you so much!! Regards, Pintu
