read-only file system

Support
1

Hi,

i’m trying to backup some files from a remote windows 8 machine running synctrazor, to a NAS running Ubuntu 16 with an encrypted BTRFS filesystem. Every syncthing is up to date. Procedure is as following:

sudo cryptsetup luksOpen /dev/sda sda

sudo mount /dev/mapper/sda /NASS

system-config-samba

from this point on i’m able to send and receive files over the network with several windows machines. than i want to start syncing

syncthing

than i add the folder on my workstation, and make it share with the NAS. workstation is scanning… NAS messages “workstation wants to share a folder…” i add the name and path on the BTRFS filesystem

/NASS/remotebackup

but i always get these messages from my NAS’s syncthing

mkdir /NASS: read-only file system

mkdir /NASS/remotebackup/.stfolder: no such file or directory

mkdir works fine when running from the commandline under the logged in user, and persmissions look good:

ls -l /

shows the logged in user has permissions drwxrwxrwx on /NASS. Does anybody have a hint what could be wrong? greetings.

2

Permissions have no meaning if the filesystem as a whole is read only, which seems to be the case in your case. Command line file creationg might work at / but not at /NASS etc.

3

as said, the filesystem is perfectly read/writeable via samba, also

touch /NASS/remotebackup/test.log

works fine

echo foobar > /NASS/remotebackup/test.log

writes to this file and mount shows

/dev/mapper/sda on /NASS type btrfs (rw,relatime,space_cache,subvolid=5,subvol=/)

so syncthing is misinterpreting something, under both accounts, local user and superuser.

4

Can you show a full startup log?

5

hi,

this is what i get on the commandline while startup

chorn@NASS:~$ syncthing
[monitor] 13:59:22 INFO: Starting syncthing
[VISGX] 13:59:22 INFO: syncthing v0.14.39 "Dysprosium Dragonfly" (go1.9 linux-amd64) snap@build.syncthing.net 2017-09-25 06:05:21 UTC [noupgrade]
[VISGX] 13:59:22 INFO: My ID: VISGXP6-4BC6YIV-EQYIY3K-6AZXL5A-WRCCOMC-TRDYPL2-DLLNCPB-56CWFQU
[VISGX] 13:59:23 INFO: Single thread SHA256 performance is 153 MB/s using minio/sha256-simd (129 MB/s using crypto/sha256).
[VISGX] 13:59:24 INFO: Hashing performance with weak hash is 111.77 MB/s
[VISGX] 13:59:24 INFO: Hashing performance without weak hash is 147.87 MB/s
[VISGX] 13:59:24 INFO: Weak hash disabled, as it has an unacceptable performance impact.
[VISGX] 14:02:31 WARNING: Creating directory for "Gamestation Backup complete" (jwujs-khypf): mkdir /NASS: read-only file system
[VISGX] 14:02:31 WARNING: Creating folder marker: mkdir /NASS/remotebackup/.stfolder: no such file or directory
[VISGX] 14:02:31 INFO: Ready to synchronize "Gamestation Backup complete" (jwujs-khypf) (readwrite)
[VISGX] 14:02:31 WARNING: Stopping folder "Gamestation Backup complete" (jwujs-khypf) - folder path missing
[VISGX] 14:02:31 INFO: Stopping folder "Gamestation Backup complete" (jwujs-khypf) due to error: folder path missing
[VISGX] 14:02:31 INFO: Failed initial scan of readwrite folder "Gamestation Backup complete" (jwujs-khypf)
[VISGX] 14:02:31 INFO: Send rate is unlimited, receive rate is unlimited
[VISGX] 14:02:31 INFO: Rate limits do not apply to LAN connections
[VISGX] 14:02:31 INFO: Using discovery server ht tps://discovery-v4-2.syncthing.net/v2/?id=DVU36WY-H3LVZHW-E6LLFRE-YAFN5EL-HILWRYP-OC2M47J-Z4PE62Y-ADIBDQC
[VISGX] 14:02:31 INFO: TCP listener ([::]:22000) starting
[VISGX] 14:02:31 INFO: Using discovery server ht tps://discovery-v4-3.syncthing.net/v2/?id=VK6HNJ3-VVMM66S-HRVWSCR-IXEHL2H-U4AQ4MW-UCPQBWX-J2L2UBK-NVZRDQZ
[VISGX] 14:02:32 INFO: Skipping pull of "Gamestation Backup complete" (jwujs-khypf) due to folder error: folder path missing
[VISGX] 14:02:33 INFO: GUI and API listening on 127.0.0.1:8384
[VISGX] 14:02:33 INFO: Access the GUI via the following URL: ht tp://127.0.0.1:8384/
[VISGX] 14:02:33 INFO: Device VISGXP6-4BC6YIV-EQYIY3K-6AZXL5A-WRCCOMC-TRDYPL2-DLLNCPB-56CWFQU is "NASS" at [dynamic]
[VISGX] 14:02:33 INFO: Device GARDV5V-DXNYQEK-ZN4GAYM-A3DJKUW-27RLGQ7-A252YA2-2YQVTUO-HXJQVA6 is "Workstation" at [dynamic]
[VISGX] 14:02:42 INFO: Skipping pull of "Gamestation Backup complete" (jwujs-khypf) due to folder error: folder path missing
[VISGX] 14:02:42 INFO: Detected 1 NAT device
[VISGX] 14:02:44 INFO: Joined relay relay://51.255.75.9:22067
[VISGX] 14:02:52 INFO: Skipping pull of "Gamestation Backup complete" (jwujs-khypf) due to folder error: folder path missing
[VISGX] 14:04:17 INFO: Established secure connection to GARDV5V-DXNYQEK-ZN4GAYM-A3DJKUW-27RLGQ7-A252YA2-2YQVTUO-HXJQVA6 at 192.168.178.28:22000-192.168.178.53:63217 (tcp-server) (TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305)
[VISGX] 14:04:17 INFO: Device GARDV5V-DXNYQEK-ZN4GAYM-A3DJKUW-27RLGQ7-A252YA2-2YQVTUO-HXJQVA6 client is "syncthing v0.14.39" named "Gamestation"

greetings

6

Seems it does a mkdirall, which does it step by step and fails at the root which is potentially read only.

7

Which is reasonable, but shouldn’t happen if the folder path exists. We only end up in the MkdirAll if we get a “does not exist” back for the stat of the folder path…

8

Perhaps fs abstraction anomaly?

9

is there anything i can do to help with this? any stats to provide? any configuration on my machine? i really do not know how to get further.

greetings.

10

Well you can pre-create the directories yourself, if that helps, create an issue on github.

11

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