linux-ext4 - [Bug 36172] "kernel BUG at fs/ext4/super.c" triggered after tune2fs/remount

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Message-Id: <20120824140137.E253B11FC6C@bugzilla.kernel.org>
Date:	Fri, 24 Aug 2012 14:01:37 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 36172] "kernel BUG at fs/ext4/super.c" triggered after
 tune2fs/remount

https://bugzilla.kernel.org/show_bug.cgi?id=36172


Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |CLOSED
                 CC|                            |tytso@....edu
         Resolution|                            |INVALID




--- Comment #5 from Theodore Tso <tytso@....edu>  2012-08-24 14:01:37 ---
We should just fix this in tune2fs, and not allow the journal to be removed
when the file system is mounted, even if it is only mounted read/only.    I
don't know what I was thinking when I allowed tune2fs to do this, but it just
doesn't work.  Even with this patch, the problem is that the journal (and its
blocks) are released, and so when the file system gets remounted read/write,
the kernel will try to use journaling after the remount, and this will cause
all sorts of problems.

We could add code to ext4 to detect this case and release the journalling
structure, but it's going to be problematic for ext3, so we should just remove
this capability from tune2fs.   Fortunately it's not going to hit that many
people, so it's probably not worth it to add support in ext4 just for the older
versions of e2fsprogs; it's pretty rare that someone will want to disable the
journal while the fs is mounted.

So I'm going to close this as a kernel bug, and treat it as an e2fsprogs bug.

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