Red Hat Enterprise Linux 3: System Administration Guide
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# 8.6. Compatibility with Older Systems

If an ACL has been set on any file on a given file system, that file system has the `ext_attr` attribute. This attribute can be seen using the following command:

    tune2fs -l <filesystem-device>

A file system that has acquired the `ext_attr` attribute can be mounted with older kernels, but those kernels do not enforce any ACLs which have been set.

Versions of the `e2fsck` utility included in version 1.22 and higher of the `e2fsprogs` package (including the versions in Red Hat Enterprise Linux 2.1 and 3) can check a file system with the `ext_attr` attribute. Older versions refuse to check it.

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