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Finally got my RP2 rooted and using adb to get the info we need to very fstabs

aura:/ # ls -al /dev/block/platform/soc/1d84000.ufshc/by-name/
total 0
drwxr-xr-x 2 root root 1900 1970-04-21 01:08 .
drwxr-xr-x 4 root root 2060 1970-04-21 01:08 ..
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 ALIGN_TO_128K_1 -> /dev/block/sdd1
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 ALIGN_TO_128K_2 -> /dev/block/sdf1
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 ImageFv_a -> /dev/block/sde19
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 ImageFv_b -> /dev/block/sde39
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 abl_a -> /dev/block/sde8
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 abl_b -> /dev/block/sde28
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 aop_a -> /dev/block/sde1
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 aop_b -> /dev/block/sde21
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 apdp -> /dev/block/sde45
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 bluetooth_a -> /dev/block/sde5
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 bluetooth_b -> /dev/block/sde25
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 boot_a -> /dev/block/sde11
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 boot_b -> /dev/block/sde31
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 box -> /dev/block/sda12
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 cdt -> /dev/block/sdd2
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 cmnlib64_a -> /dev/block/sde13
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 cmnlib64_b -> /dev/block/sde33
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 cmnlib_a -> /dev/block/sde12
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 cmnlib_b -> /dev/block/sde32
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 ddr -> /dev/block/sdd3
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 devcfg_a -> /dev/block/sde14
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 devcfg_b -> /dev/block/sde34
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 deviceinfo -> /dev/block/sdf5
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 devinfo -> /dev/block/sde43
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 dip -> /dev/block/sde44
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 dsp_a -> /dev/block/sde9
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 dsp_b -> /dev/block/sde29
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 dtbo_a -> /dev/block/sde17
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 dtbo_b -> /dev/block/sde37
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 frp -> /dev/block/sda5
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 fsc -> /dev/block/sdf12
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 fsg -> /dev/block/sdf11
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 hyp_a -> /dev/block/sde3
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 hyp_b -> /dev/block/sde23
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 keymaster_a -> /dev/block/sde10
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 keymaster_b -> /dev/block/sde30
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 keystore -> /dev/block/sda4
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 limits -> /dev/block/sde48
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 logbk -> /dev/block/sda13
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 logdump -> /dev/block/sde52
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 logfs -> /dev/block/sde50
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 mdtp_a -> /dev/block/sde7
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 mdtp_b -> /dev/block/sde27
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 mdtpsecapp_a -> /dev/block/sde6
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 mdtpsecapp_b -> /dev/block/sde26
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 mfd -> /dev/block/sdd5
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 mfdbk -> /dev/block/sdd6
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 misc -> /dev/block/sda3
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 modem_a -> /dev/block/sde4
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 modem_b -> /dev/block/sde24
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 modemst1 -> /dev/block/sdf2
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 modemst2 -> /dev/block/sdf3
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 msadp -> /dev/block/sde46
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 nvcust -> /dev/block/sdf8
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 nvdef_a -> /dev/block/sdf9
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 nvdef_b -> /dev/block/sdf10
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 nvrf -> /dev/block/sdd7
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 nvrfbk -> /dev/block/sdd8
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 oem_a -> /dev/block/sda8
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 oem_b -> /dev/block/sda11
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 pad3 -> /dev/block/sdd4
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 pad5 -> /dev/block/sdf4
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 persist -> /dev/block/sda2
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 qupfw_a -> /dev/block/sde15
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 qupfw_b -> /dev/block/sde35
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 resv3 -> /dev/block/sdd9
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 resv4 -> /dev/block/sde53
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 resv5 -> /dev/block/sdf13
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 rf_nv -> /dev/block/sdf7
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 sec -> /dev/block/sde42
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 securefs -> /dev/block/sdf6
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 splash -> /dev/block/sde41
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 spunvm -> /dev/block/sde47
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 ssd -> /dev/block/sda1
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 sti -> /dev/block/sde51
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 storsec_a -> /dev/block/sde18
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 storsec_b -> /dev/block/sde38
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 system_a -> /dev/block/sda6
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 system_b -> /dev/block/sda9
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 systeminfo_a -> /dev/block/sde20
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 systeminfo_b -> /dev/block/sde40
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 toolsfv -> /dev/block/sde49
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 tz_a -> /dev/block/sde2
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 tz_b -> /dev/block/sde22
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 userdata -> /dev/block/sda14
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 vbmeta_a -> /dev/block/sde16
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 vbmeta_b -> /dev/block/sde36
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 vendor_a -> /dev/block/sda7
lrwxrwxrwx 1 root root 16 1970-04-21 01:08 vendor_b -> /dev/block/sda10
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 xbl_a -> /dev/block/sdb1
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 xbl_b -> /dev/block/sdc1
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 xbl_config_a -> /dev/block/sdb2
lrwxrwxrwx 1 root root 15 1970-04-21 01:08 xbl_config_b -> /dev/block/sdc2

And sizes of the partitions

aura:/ # cat /proc/partitions
major minor #blocks name
1 0 8192 ram0
1 1 8192 ram1
1 2 8192 ram2
1 3 8192 ram3
1 4 8192 ram4
1 5 8192 ram5
1 6 8192 ram6
1 7 8192 ram7
1 8 8192 ram8
1 9 8192 ram9
1 10 8192 ram10
1 11 8192 ram11
1 12 8192 ram12
1 13 8192 ram13
1 14 8192 ram14
1 15 8192 ram15
8 0 61648896 sda
8 1 8 sda1
8 2 32768 sda2
8 3 1024 sda3
8 4 512 sda4
8 5 512 sda5
8 6 4194304 sda6
8 7 1048576 sda7
8 8 1048576 sda8
8 9 4194304 sda9
8 10 1048576 sda10
8 11 1048576 sda11
8 12 8192 sda12
8 13 65536 sda13
8 14 48957276 sda14
8 16 4096 sdb
8 17 3584 sdb1
8 18 356 sdb2
8 32 4096 sdc
8 33 3584 sdc1
8 34 356 sdc2
8 48 16384 sdd
8 49 104 sdd1
8 50 128 sdd2
8 51 1024 sdd3
8 52 6912 sdd4
8 53 512 sdd5
8 54 512 sdd6
8 55 2048 sdd7
8 56 2048 sdd8
8 57 2940 sdd9
8 64 729088 sde
8 65 512 sde1
8 66 2048 sde2
8 67 512 sde3
8 68 141312 sde4
8 69 1024 sde5
8 70 4096 sde6
8 71 32768 sde7
8 72 1024 sde8
8 73 32768 sde9
8 74 512 sde10
8 75 65536 sde11
8 76 512 sde12
8 77 512 sde13
8 78 128 sde14
8 79 64 sde15
259 0 64 sde16
259 1 8192 sde17
259 2 128 sde18
259 3 1024 sde19
259 4 256 sde20
259 5 512 sde21
259 6 2048 sde22
259 7 512 sde23
259 8 141312 sde24
259 9 1024 sde25
259 10 4096 sde26
259 11 32768 sde27
259 12 1024 sde28
259 13 32768 sde29
259 14 512 sde30
259 15 65536 sde31
259 16 512 sde32
259 17 512 sde33
259 18 128 sde34
259 19 64 sde35
259 20 64 sde36
259 21 8192 sde37
259 22 128 sde38
259 23 1024 sde39
259 24 256 sde40
259 25 36864 sde41
259 26 16 sde42
259 27 4 sde43
259 28 1024 sde44
259 29 256 sde45
259 30 256 sde46
259 31 8192 sde47
259 32 4 sde48
259 33 1024 sde49
259 34 8192 sde50
259 35 2048 sde51
259 36 65536 sde52
259 37 19532 sde53
8 80 86016 sdf
8 81 104 sdf1
8 82 2048 sdf2
8 83 2048 sdf3
8 84 9984 sdf4
8 85 1024 sdf5
8 86 8192 sdf6
8 87 2048 sdf7
8 88 2048 sdf8
8 89 4096 sdf9
8 90 4096 sdf10
8 91 2048 sdf11
8 92 128 sdf12
8 93 46076 sdf13
254 0 1031948 dm-0
254 1 48957260 dm-1
7 64 65536 loop64

Verified recovery partition size:

aura:/ # parted /dev/block/platform/soc/1d84000.ufshc/by-name/boot_a unit B print
Error: /dev/block/sde11: unrecognised disk label
Model: Unknown (unknown)
Disk /dev/block/sde11: [B]67108864[/B]B
Sector size (logical/physical): 4096B/4096B
Partition Table: unknown
Disk Flags:

System Partition

aura:/ # parted /dev/block/platform/soc/1d84000.ufshc/by-name/sys unit B print
system_a system_b systeminfo_a systeminfo_b
aura:/ # parted /dev/block/platform/soc/1d84000.ufshc/by-name/system_a unit B print
Model: Unknown (unknown)
Disk /dev/block/sda6: [B]4294967296[/B]B
Sector size (logical/physical): 4096B/4096B
Partition Table: loop
Disk Flags:

Number Start End Size File system Flags
1 0B 4294967295B 4294967296B ext4

Userdata partition

aura:/ # parted /dev/block/platform/soc/1d84000.ufshc/by-name/userdata unit B print
Error: /dev/block/sda14: unrecognised disk label
Model: Unknown (unknown)
Disk /dev/block/sda14: [B]50132250624[/B]B
Sector size (logical/physical): 4096B/4096B
Partition Table: unknown
Disk Flags: