Background

I have a BananaPi with Bananian, Apache2 and OwnCloud. Plugged into the Banana Pi is a NTFS-formatted HDD that gets mounted via ntfs-3g. I created five users on the system and there is a .NTFS-3G/UserMapping file inside the base-directory of the mounted partition, resulting in a UID/GID/SID mapping of the users and in automatically setting the permissions and acl options when the partition gets mounted. (www-data is not included in the UserMapping-file.) This partition contains a directory shares for Samba-shares and a directory owncloud/data. The owner of the whole owncloud-tree is root:root and permissions are 777.

Problem

In order for apache to access the data and owncloud to work, the owncloud/data directory has to belong to www-data:www-data. But if I try this:

chown -R www-data:www-data /media/hdd/owncloud/data

the ownership gets set to root:root, whatever owner the files and folders had before. This also happens for a single file:

chown www-data:www-data /media/hdd/owncloud/data/owncloud.log

and for every other place on the HDD:

chown -R www-data:www-data /media/hdd/shares/maximilian

But if I set the ownership to an arbitrary user, for example:

chown -R maximilian:maximilian /media/hdd/owncloud/data

it works perfectly fine!

Why can't I set the ownership to www-data then?

Background

I have a BananaPi with Bananian, Apache2 and OwnCloud. Plugged into the Banana Pi is a NTFS-formatted HDD that gets mounted via ntfs-3g. I created five users on the system and there is a .NTFS-3G/UserMapping file inside the base-directory of the mounted partition, resulting in a UID/GID/SID mapping of the users and in automatically setting the permissions and acl options when the partition gets mounted. (www-data is not included in the UserMapping-file.) This partition contains a directory shares for Samba-shares and a directory owncloud/data. The owner of the whole owncloud-tree is root:root and permissions are 777.

Problem

In order for apache to access the data and owncloud to work, the owncloud/data directory has to belong to www-data:www-data. But if I try this:

chown -R www-data:www-data /media/hdd/owncloud/data 

the ownership gets set to root:root, whatever owner the files and folders had before. This also happens for a single file:

chown www-data:www-data /media/hdd/owncloud/data/owncloud.log 

and for every other place on the HDD:

chown -R www-data:www-data /media/hdd/shares/maximilian 

But if I set the ownership to an arbitrary user, for example:

chown -R maximilian:maximilian /media/hdd/owncloud/data 

it works perfectly fine!

Why can't I set the ownership to www-data then?