On Sun, May 19, 2013 at 05:22:45PM -0400, Baho Utot wrote:
> I have always in the past used a ext3 partition on my LFS systems. I 
> have changed to ext4 and on boot I get errors that are saying than it 
> had problems mounting the partition due to unsupported  options, it has 
> EXT3-fs in the first two error messages, the third message says it uses 
> EXT4-fs and it then mounts without error.
> I belive  it is coming from the kernel as it has a kernal time of [ 
> 1.568232].
> 
> Is this normal for the boot to try mount the root partition with EXT3-fs 
> twice before then using EXT4-fs?
> 
 sort of.  ISTR there are config option(s) to mount ext{2,3} using
ext4.  On at least one of my machines I see two such messages, but
the first is for ext3 and the second for ext2 :

[    1.765843] sd 0:0:0:0: [sda] Attached SCSI disk
[    1.792078] EXT3-fs (sda6): error: couldn't mount because of unsupported 
optional features (240)
[    1.795575] EXT2-fs (sda6): error: couldn't mount because of unsupported 
optional features (240)
[    1.818698] EXT4-fs (sda6): mounted filesystem with ordered data mode. Opts: 
(null)
[    1.821899] VFS: Mounted root (ext4 filesystem) readonly on device 8:6.

 I can't remember when this started, and google is useless (loads of
references to converting *to* ext4, or for an obsolete config
option), but at some time the ext4 driver became able to mount ext3
and ext2 - if those were enabled.

ĸen
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