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According to mount, the file system does not have the ACL option:

$ mount
/dev/mapper/sys_vg-root_lv on / type ext3 (rw)

However, I could still setfacl and getfacl on this file system. Perhaps I'm misunderstanding the ACL option.

I'm using RHEL5 on this system.

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Possibly this will be a interview Question, Good to know, thanks. – user3145837 Sep 25 '14 at 8:07
up vote 3 down vote accepted

In RHEL, ACLs are enabled by default for any filesystems configured at install-time. This can be verified with tune2fs -l <device>.

Any filesystems created post-install must either have the acl mount option in /etc/fstab, or have it hard-set with tune2fs -o acl <device>.

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Ah nice to know. tune2fs -l /dev/mapper/sys_vg-root_lv | grep -i 'acl' showed that it was part of the default mount options. – Belmin Fernandez Feb 14 '12 at 20:02

ACLs are enabled by default on some filesystems like ext3, ext4, and xfs on modern Linux distributions.

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