I am still waiting for a database-based file system. Some filesystems like NTFS/ReFS, BeFS and afaik ReiseFS4(?) and Btrfs(?)) could be extended. Microsoft ext

I am still waiting for a database-based file system. Some filesystems like NTFS/ReFS, BeFS and afaik ReiseFS4(?) and Btrfs(?)) could be extended. Microsoft extended the NTFS fs driver with the Cairo project in the NT4/5 era: http://en.wikipedia.org/wiki/Cairo_(operating_system) http://en.wikipedia.org/wiki/Cairo_(operating_system) All of the other functions NTFS exports for the EFS driver begin with the prefix NtOfs, which presumably stands for NT Object File System. One of the original goals of the NT 5.0 project (code-named Cairo) was to develop an object-oriented file system. Although NTFS in Win2K probably hasn't reached the level of object orientation that the Cairo planners had in mind, Microsoft has extended NTFS in several significant ways from its NT 4.0 implementation. One of those ways is NTFS's support for encrypted files via the NtOfs interfaces. -- http://windowsitpro.com/systems-management/inside-encrypting-file-system-part-1 http://windowsitpro.com/systems-management/inside-encrypting... , more info: https://books.google.at/books?id=5f3mlM-JKUAC&lpg=PA117&ots=uRVy3Jqu1x&dq=http%3A%2F%2Fmicrosoft.com%2Fntserver%2Fcairomb.htm&pg=PA117#v=onepage&q=http://microsoft.com/ntserver/cairomb.htm&f=false https://books.google.at/books?id=5f3mlM-JKUAC&lpg=PA117&ots=... Later Microsoft moved the database to user mode, the WinFS project, the MS SQL db was stored in hidden directory on the NTFS filesystem: http://en.wikipedia.org/wiki/WinFS http://en.wikipedia.org/wiki/WinFS . WinFS failed because of its over complicated Metadata-Ontology and it was too slow for a filesystem (dotNet based shell extension). Microsoft moved the ideas to "SharePoint" (2007-2016) that overs now some of the proposed features: http://en.wikipedia.org/wiki/SharePoint http://en.wikipedia.org/wiki/SharePoint . BeFS includes support for extended file attributes (metadata), with indexing and a querying language like a relational database: http://en.wikipedia.org/wiki/Be_File_System http://en.wikipedia.org/wiki/Be_File_System, BeFS book with all details: http://www.nobius.org/~dbg/practical-file-system-design.pdf http://www.nobius.org/~dbg/practical-file-system-design.pdf The IBM AS/400 and iSeries had already a database-based filesystem in the 1980s: http://en.wikipedia.org/wiki/File_system#Database_file_systems http://en.wikipedia.org/wiki/File_system#Database_file_syste...