[Nexus 5 Q&A, Help & Troubleshooting] danoussh:
Thanks for the reply. I really hoped there was a way by installing a new rom above which would allow full disk encryption to be unlocked again.

EDIT: Before I give up, here is some extra info.

I can navigate through the TRWP file manager on system through folders, I see files and folders. Is that a clue that my phone is not full disk encrypted, or is full disk encrypted only for user data and the full system?

Also here is a dump I did via ADB shell.

~ # [6ncat /proc/partitions
major minor #blocks name

179 0 15388672 mmcblk0
179 1 65536 mmcblk0p1
179 2 1024 mmcblk0p2
179 3 512 mmcblk0p3
179 4 512 mmcblk0p4
179 5 512 mmcblk0p5
179 6 512 mmcblk0p6
179 7 2048 mmcblk0p7
179 8 1024 mmcblk0p8
179 9 512 mmcblk0p9
179 10 512 mmcblk0p10
179 11 512 mmcblk0p11
179 12 3072 mmcblk0p12
179 13 3072 mmcblk0p13
179 14 512 mmcblk0p14
179 15 16384 mmcblk0p15
179 16 16384 mmcblk0p16
179 17 3072 mmcblk0p17
179 18 22528 mmcblk0p18
179 19 22528 mmcblk0p19
179 20 22528 mmcblk0p20
179 21 3072 mmcblk0p21
179 22 512 mmcblk0p22
179 23 512 mmcblk0p23
179 24 512 mmcblk0p24
179 25 1500000 mmcblk0p25
179 26 30720 mmcblk0p26
179 27 265375 mmcblk0p27
179 28 13404138 mmcblk0p28
179 29 5 mmcblk0p29
179 32 4096 mmcblk0rpmb
~ # [6n

------------------------------------------

~ # ls -la /dev/block/platform/msm_sdcc.1/by-name/[J
__bionic_open_tzdata: couldn't find any tzdata when looking for localtime!
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
drwxr-xr-x 2 root root 620 Jan 5 21:43 .
drwxr-xr-x 4 root root 700 Jan 5 21:43 ..
lrwxrwxrwx 1 root root 21 Jan 5 21:43 DDR -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root 20 Jan 5 21:43 aboot -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root 21 Jan 5 21:43 abootb -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 Jan 5 21:43 boot -> /dev/block/mmcblk0p19
lrwxrwxrwx 1 root root 21 Jan 5 21:43 cache -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root 21 Jan 5 21:43 crypto -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root 21 Jan 5 21:43 fsc -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root 21 Jan 5 21:43 fsg -> /dev/block/mmcblk0p21
lrwxrwxrwx 1 root root 21 Jan 5 21:43 grow -> /dev/block/mmcblk0p29
lrwxrwxrwx 1 root root 21 Jan 5 21:43 imgdata -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root 21 Jan 5 21:43 laf -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 21 Jan 5 21:43 metadata -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 Jan 5 21:43 misc -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 20 Jan 5 21:43 modem -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 21 Jan 5 21:43 modemst1 -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 21 Jan 5 21:43 modemst2 -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 20 Jan 5 21:43 pad -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root 21 Jan 5 21:43 persist -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 21 Jan 5 21:43 recovery -> /dev/block/mmcblk0p20
lrwxrwxrwx 1 root root 20 Jan 5 21:43 rpm -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 21 Jan 5 21:43 rpmb -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 20 Jan 5 21:43 sbl1 -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 20 Jan 5 21:43 sbl1b -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root 20 Jan 5 21:43 sdi -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root 21 Jan 5 21:43 ssd -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root 21 Jan 5 21:43 system -> /dev/block/mmcblk0p25
lrwxrwxrwx 1 root root 20 Jan 5 21:43 tz -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 20 Jan 5 21:43 tzb -> /dev/block/mmcblk0p9
lrwxrwxrwx 1 root root 21 Jan 5 21:43 userdata -> /dev/block/mmcblk0p28
~ # [6n