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QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
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fs-ext2.so
Linux Ext2 filesystem

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
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        DOS filesystem (QNX OS)
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        Linux Ext2 filesystem
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        NFS 3 client filesystem (QNX OS)
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        Shared object that supports the QNX compressed filesystem (QCFS)
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        Shared object that supports the Power-Safe filesystem (QNX OS)
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        Shared object that supports the QNX Trusted Disk feature (QNX OS)
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Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

fs-ext2.so

QNX SDP8.0Utilities ReferenceUtilities

Linux Ext2 filesystem

Syntax:

driver ... ext2 ext2_options ... &

where driver is one of the devb-* drivers.

Runs on:

QNX OS

Options:

unfixbadver: Turn off workarounds for corrupt volumes created by the buggy 1.19 version of mke2fs.
prealloc: Enable file preallocation methods to improve file write performance.
Warning:
In case of an unclean shutdown, there is a possibility of leaked blocks. Use the checker utility e2fsck to recover such blocks.

Description:

The Ext2 filesystem (fs-ext2.so) provides transparent access to Linux disk partitions. This implementation supports the standard set of features found in Ext2 versions 0 and 1.

Sparse file support is included in order to be compatible with existing Linux partitions. Other filesystems can only be stacked read-only on top of sparse files. There are no such restrictions on normal files.

If an Ext2 filesystem isn't unmounted properly, a filesystem checker is usually responsible for cleaning up the next time the filesystem is mounted. Although the fs-ext2.so module is equipped to perform a quick test, it automatically mounts the filesystem as read-only if it detects any significant problems (which should be fixed using a filesystem checker).

The following features are not currently supported:

dirty ext3 journal
compression
encryption
extents
64 bit block addressing (very large filesystems)

The following features allow for a filesystem to be mounted as read-only:

huge files
quotas
bigalloc

Note:

This filesystem uses UTF-8 encoding for presentation of its filenames; attempts to specify a filename not using UTF-8 encoding will fail (with an error of EILSEQ).

For details on filesystems that QNX OS supports, including their drivers and tool set, see the Filesystems chapter of the System Architecture guide.

Caveats:

Although Ext2 is the main filesystem for Linux systems, we don't recommend using fs-ext2.so as a replacement for the Power-Safe (fs-qnx6.so) filesystem. Currently, we don't support booting from Ext2 partitions. Also, the Ext2 filesystem relies heavily on its filesystem checker to maintain integrity; this and other support utilities (e.g., mke2fs) are available as part of a separate, optional package in the QNX SDP. Please contact QNX support if you need access to these tools.

Page updated: December 04, 2024