Hi Konstantin, I have an interest in this - I wrote the Btrfs driver for Windows, which also had to deal with the issue of how to map NTFS concept to Linux xattrs. Unless there's a good reason, I think it'd be in everyone's interests if we used the same conventions.
You have four(!) different ways of referring to the attributes value, which seems a bit excessive. I suggest you just use user.DOSATTRIB - this should be in the user namespace as users can set e.g. the hidden flag on files at will. This also matches what my driver does, and what Samba does. I also think it's a mistake to only expose user.DOSATTRIB to Samba - there's patches in Wine staging which would also benefit from this. Also, unless I'm missing something there's a bug in ntfs_setxattr - the user shouldn't be able to clear the FILE_ATTRIBUTE_DIRECTORY flag on directories nor set it on files. Thanks Mark
