lkml.org 
[lkml]   [2015]   [Jul]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/3] Remove ext3 filesystem driver
On Wed, Jul 15, 2015 at 11:20:55AM -0400, Austin S Hemmelgarn wrote:
>
> There really isn't much of a clear distinction between ext3 and ext4 (at
> least from an end user standpoint), other than the fact that there are some
> options that only the ext4 driver understands (like extent based
> allocation).

Yeah, the main reason why we did the ext3 -> ext4 fork was that adding
64-bit numbers required major surgery, and we didn't want to break a
lot of production users who were using ext3. But from a file system
format perspective, ext2, ext3, and ext4 are the same logical file
system. There are just multiple different implementations, which all
support slightly different sets of file system features:

* Linux's ext2
* Linux's ext3
* Linux's ext4
* Hurd's ext2
* *BSD's ext2
* Grub's ext2/3/4

The last three implementations are in fact independent ones created
from scratch. :-)

Fortunately we use the same file system support code, e2fsprogs, for
all of them, which is good since it has a very extensive set of
regression test sets for our fsck program, and we've continued adding
to it as we add new file system features.

- Ted


\
 
 \ /
  Last update: 2015-07-16 01:41    [W:0.057 / U:5.872 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site