lkml.org 
[lkml]   [2011]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: CONFIG_EXT4_USE_FOR_EXT23: rootfs shows as ext2 instead of ext4
>>>>> "Ted" == Ted Ts'o <tytso@mit.edu> writes:

Ted> On Tue, Apr 12, 2011 at 01:25:08PM -0400, Mark Lord wrote:
>> Ted et al.
>>
>> I've only just noticed this, so I have no idea how long it has been this way.
>>
>> When I build a kernel with CONFIG_EXT4_USE_FOR_EXT23=y and boot from it,
>> the ext4 root filesystem shows up as "ext2" mode, rather than "ext4".
>>
>> This looks very wrong to me, and quite dangerous.

Ted> It's a cosemtic bug, I agree, but I'm not sure why you consider it
Ted> dangerous.

Ted> CONFIG_EXT4_USE_FOR_EXT23 means that ext4 registers itself as
Ted> ext2 and/or ext3, if ext2 and/or ext3 are not configured into the
Ted> kernel. Since the kernel tries to mount the file system as ext2,
Ted> ext3, and then ext4, and uses whichever one works first.

Should it instead be: CONFIG_EXT4_MASQUERADE_AS_EXT23 instead, so
it's blindingly obvious what's going on here.

John


\
 
 \ /
  Last update: 2011-04-13 18:55    [W:0.087 / U:7.728 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site