fs-ext2.so

Linux Ext2 filesystem

Syntax:

driver ... ext2 ext2_options ... &

Runs on:

Neutrino

Options:

Where driver is one of the devb-* drivers.

unfixbadver

Turns off work-arounds for corrupt volumes created by the buggy 1.19 version of mke2fs.

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:

• file fragments (sub-block allocation)
• large files (> 2 GB)
• filetype extension
• compression
• b-tree directories

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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).

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Caveats:

Although Ext2 is the main filesystem for Linux systems, we don't recommend using fs-ext2.so as a replacement for the QNX 4 filesystem (fs-qnx4.so). 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 not currently available for QNX Neutrino.

See also:

devb-*, fs-cd.so, fs-dos.so, fs-mac.so, fs-nt.so, fs-qnx4.so, fs-qnx6.so, fs-udf.so, io-blk.so, mount, umount

Filesystems chapter of System Architecture

QNX Neutrino User's Guide:

• “Linux Ext2 filesystem” in the Working With Filesystems chapter
• “Filesystems and block I/O (devb-*) drivers” in the Fine-Tuning Your System chapter
• “Filesystem limits” in the Understanding System Limits chapter