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


On Tue, 2006-03-28 at 13:52 -0800, Robinson Tiemuqinke wrote:

>  First, what's the "large_file" feature REALLY means?
> Then, what's the size of "large file" to light this
> feature on? 2GB, or 2TB? 


>  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?

They are there simply to indicate that a given feature is present on the
filesystem.  They prevent old versions of the kernel and/or e2fsck tools
from mistakenly operating on a filesystem with newer features,
potentially corrupting things on disk or returning incorrect file

All remotely recent kernels have large file support for ext3, and all
2.6 ones (and many vendor-supplied 2.4 ones) have ext_attr, so you have
to be running something pretty old to run into compatibility problems
with either of those features.


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