FC5: "ext_attr" and "large_file" features for ext3 file systems ???

Digvijoy Chatterjee digvijoy_chatterjee at infosys.com
Wed Mar 29 05:55:08 UTC 2006

ext_attr , is for extendended attributes , things like access control
are not part of an ext3 FS by default ,if you want acl ,then the
ext_attr feature will tell you.

large_file is for files beyond 2TB ,but when it swtiches on
automatically , i have no idea..


On Tue, 2006-03-28 at 13:52 -0800, Robinson Tiemuqinke wrote:
> Hi,
>  Fedora Core ext3 file systems newbie questions:
>  Just interested in the Linux ext3 features but got
> confused with "large_file" and "ext_attr".
>  First, what's the "large_file" feature REALLY means?
> For file systems created with same commands and
> options some file systems have it on while some not.
> It is said that the feature is automatic -- If there
> is a large file then it is lit on otherwise it is off.
> Then, what's the size of "large file" to light this
> feature on? 2GB, or 2TB? or varies with the kernel
> version?
>  Second, the "ext_attr" feature seems another
> automatic one: it only appears after the first
> "setfacl" command runs on the file system and then the
> feature will keep on there forever even ACL is
> removed. What's the indication of "ext_attr" feature
> and what are the reasons behind to have this feature?
> Thanks a lot.
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