Andreas Dilger wrote:

On Aug 02, 2007  17:55 +0800, Coly Li wrote:

quoted

These days, when I read the source code of mke2fs, I found an option -f
to set the fragment size.

But I can not find any explaining for ext3/4 framgment from google,
excepting someone saying ext2/3 does not support this feature.

Can anyone tell me what is the function or purpose of fragment of ext
file system ?

This is an obsolete concept from BSD that was never used by ext[234].
Consider a "fragment" in this context to be the same as a "tail" for
reiserfs.  A very small file, or the end of a file that is less than
a block.

There's a fair amount of code around this never-implemented concept;
should it be removed?  :)

-Eric