[Huawei P20 Guides, News, & Discussion] crucky:
Hello i tought it share my findings here :)

Huawei P20 Partitions

HWEML:/dev/block/platform/ff3c0000.ufs/by-name $ ls -la
total 0
drwxr-xr-x 2 root root 1300 2018-03-28 14:54 .
drwxr-xr-x 4 root root 1420 2018-03-28 14:54 ..
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 bootfail_info -> /dev/block/sdd18
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 cache -> /dev/block/sdd58
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 certification -> /dev/block/sdd5
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 cust_a -> /dev/block/sdd56
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 ddr_para -> /dev/block/sdd15
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 dfx -> /dev/block/sdd20
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 dto_a -> /dev/block/sdd43
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 dts_a -> /dev/block/sdd42
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 erecovery_kernel_a -> /dev/block/sdd35
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 erecovery_ramdisk_a -> /dev/block/sdd36
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 erecovery_vbmeta_a -> /dev/block/sdd48
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 erecovery_vendor_a -> /dev/block/sdd37
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 fastboot_a -> /dev/block/sdd28
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 frp -> /dev/block/sdc1
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 fw_hifi_a -> /dev/block/sdd32
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 fw_lpm3_a -> /dev/block/sdd22
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 hdcp_a -> /dev/block/sdd24
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 hhee_a -> /dev/block/sdd26
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 hisee_encos -> /dev/block/sdd13
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 hisee_fs_a -> /dev/block/sdd27
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 hisee_img_a -> /dev/block/sdd25
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 isp_boot_a -> /dev/block/sdd30
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 isp_firmware_a -> /dev/block/sdd31
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 kernel_a -> /dev/block/sdd38
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 misc -> /dev/block/sdd19
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modem_fw_a -> /dev/block/sdd45
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 modem_om -> /dev/block/sdd8
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 modem_secure -> /dev/block/sdd3
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modemnvm_backup -> /dev/block/sdd10
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modemnvm_cust_a -> /dev/block/sdd51
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 modemnvm_factory -> /dev/block/sdd9
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modemnvm_img -> /dev/block/sdd11
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modemnvm_system -> /dev/block/sdd12
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 modemnvm_update_a -> /dev/block/sdd50
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 nvme -> /dev/block/sdd4
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 odm_a -> /dev/block/sdd57
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 oeminfo -> /dev/block/sdd6
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 patch_a -> /dev/block/sdd52
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 persist -> /dev/block/sdc2
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 product_a -> /dev/block/sdd55
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 ramdisk_a -> /dev/block/sdd39
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 recovery_ramdisk_a -> /dev/block/sdd40
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 recovery_vbmeta_a -> /dev/block/sdd47
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 recovery_vendor_a -> /dev/block/sdd41
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 reserved1 -> /dev/block/sdc3
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 reserved2 -> /dev/block/sdd16
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 reserved3_a -> /dev/block/sdd23
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 reserved4_a -> /dev/block/sdd46
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 rrecord -> /dev/block/sdd21
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 secure_storage -> /dev/block/sdd7
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 sensorhub_a -> /dev/block/sdd34
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 splash2 -> /dev/block/sdd17
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 system_a -> /dev/block/sdd59
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 teeos_a -> /dev/block/sdd33
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 trustfirmware_a -> /dev/block/sdd44
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 userdata -> /dev/block/sdd60
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 vbmeta_a -> /dev/block/sdd49
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 vector_a -> /dev/block/sdd29
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 vendor_a -> /dev/block/sdd54
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 veritykey -> /dev/block/sdd14
lrwxrwxrwx 1 root root 16 2018-03-28 14:54 version_a -> /dev/block/sdd53
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 vrl -> /dev/block/sdd1
lrwxrwxrwx 1 root root 15 2018-03-28 14:54 vrl_backup -> /dev/block/sdd2

HWEML:/system $ df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 1.4G 12M 1.4G 1% /
tmpfs 1.7G 684K 1.7G 1% /dev
/dev/block/dm-0 4.3G 3.2G 1.1G 75% /system
/dev/block/dm-1 747M 688M 44M 94% /vendor
/dev/block/dm-2 120M 110M 7.2M 94% /odm
/dev/block/dm-3 27M 516K 26M 2% /version
/dev/block/dm-4 182M 114M 64M 65% /product
/dev/block/dm-5 182M 44M 134M 25% /cust
tmpfs 1.7G 0 1.7G 0% /mnt
none 1.7G 0 1.7G 0% /sys/fs/cgroup
/dev/block/sdd60 111G 3.6G 106G 4% /data
/dev/block/sdd58 122M 60K 119M 1% /cache
/data/media 111G 4.9G 106G 5% /storage/emulated

Hope it helps some one :)