The QNX4 file-system in Linux

The QNX4 file-system option in Linux allows you to mount QNX4/QNX6-formatted floppies and hard-disk partitions on your Linux box and access the files as if they were on your native file-system.

It was originally written by Richard A. Frowÿn and Frank Denis

A fairly stable version is included with Kernels 2.2.15+ and 2.3.35+, but you should look for changes on this page.

Beware that the version included with Kernels prior to the above is quite buggy and does not support fragmented files.

• 2.6 Kernels:
  Currently, the version included with Kernel 2.6.0+ is stable.

• 2.4 Kernels:
  Currently, the version included with Kernel 2.4.19+ is stable.

  Previous versions were not able to mount QNX6 (QNXRTP) partitions created with QNX version 6.1 and later.

  A bug caused by subtle changes to the Virtual File System can cause a complete system hang when using the QNX4 file-system in Kernel 2.4.8 and 2.4.9    :-(
  The solution is to comment out line 399 of fs/qnx4/inode.c (the problem was fixed with Kernel 2.4.10)

• 2.2 Kernels:
  Currently, the version included with Kernel 2.2.15+ is stable
  It is not possible to mount QNX6 (QNXRTP) partitions created with QNX version 6.1 and later, though (and I don't plan to change that).

Please test it and send me feedback!

Beware: Do not enable write support at this time - it is badly broken!

• An alternative implementation (with functional write support) can be found at http://qnxfs.narod.ru/

Related software:

• Peter Waechtler (formerly of QSSL Germany) has written a dinit -like utility to initialize the QNX4 file-system from within Linux.
  The md5sum should be a19cd5510350bcaa625d96454e7282a5.
  In case you're very cautious, I have signed the file with my PGP key (ID=0x02D362E3).

• If you are familiar with QNX and the Send/Receive/Reply IPC and would like to use a similar mechanism with Linux, check
  the library originally written by Sam Roberts and of course
  the S.I.M.P.L. project.

QNX is a registered trademark of QNX Software Systems, Ltd.