I noticed the
e attribute on several files/directories on Linux machines installed on ext4 filesystems.
[firstname.lastname@example.org ~]$ lsattr -d /bin -------------e- /bin
The ’e’ attribute indicates that the file is using extents for mapping the blocks on disk. It may not be removed using chattr(1).
In what way is this different, and more importantly, in what way is this detail significant -- specifically why is this detail important enough to be reported as a file attribute? Under what circumstances should I ever change my behavior based on the knowledge that this file "is using extents for mapping the blocks on disk"? Presumably this is something I need to know, otherwise it wouldn't be made so obvious, right?