Compatibility with Older Systems

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

  • tune2fs -l
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 4) can
check a file system with the ext_attr attribute. Older versions refuse to check it.

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