This seems to work fine; any comments, either about
the logic, or the text descriptions, or the various
options I've shown/not shown?
To test, copy your "magic" file somewhere local,
replace the ext2/3 section with the following,
and do something like:
# file -C -m magic; file -m ./magic -s /dev/sda1
-Eric
# ext2/ext3 filesystems - Andreas Dilger <[email protected]>
0x438 leshort 0xEF53 Linux
>0x44c lelong x rev %d
>0x43e leshort x \b.%d
# No journal? ext2
>0x45c lelong ^0x0000004 ext2 filesystem data
>>0x43a leshort ^0x0000001 (mounted or unclean)
# Has a journal? ext3 or ext4
>0x45c lelong &0x0000004
# and small INCOMPAT?
>>0x460 lelong <0x0000040
# and small RO_COMPAT?
>>>0x464 lelong <0x0000008 ext3 filesystem data
# else large RO_COMPAT?
>>>0x464 lelong >0x0000007 ext4 filesystem data
# else large INCOMPAT?
>>0x460 lelong >0x000003f ext4 filesystem data
# General flags for any ext* fs
>0x460 lelong &0x0000004 (needs journal recovery)
>0x43a leshort &0x0000002 (errors)
# INCOMPAT flags
>0x460 lelong &0x0000001 (compressed)
#>0x460 lelong &0x0000002 (filetype)
#>0x460 lelong &0x0000010 (meta bg)
>0x460 lelong &0x0000040 (extents)
>0x460 lelong &0x0000080 (64bit)
#>0x460 lelong &0x0000100 (mmp)
#>0x460 lelong &0x0000200 (flex bg)
# RO_INCOMPAT flags
#>0x464 lelong &0x0000001 (sparse super)
>0x464 lelong &0x0000002 (large files)
>0x464 lelong &0x0000008 (huge files)
#>0x464 lelong &0x0000010 (gdt checksum)
#>0x464 lelong &0x0000020 (many subdirs)
#>0x463 lelong &0x0000040 (extra isize)
On Jan 30, 2008 11:19 -0600, Eric Sandeen wrote:
> This seems to work fine; any comments, either about
> the logic, or the text descriptions, or the various
> options I've shown/not shown?
>
> To test, copy your "magic" file somewhere local,
> replace the ext2/3 section with the following,
> and do something like:
>
> # file -C -m magic; file -m ./magic -s /dev/sda1
>
> -Eric
>
> # ext2/ext3 filesystems - Andreas Dilger <[email protected]>
Lol, you may as well fix up the email.... [email protected] will
probably be the least transient.
> 0x438 leshort 0xEF53 Linux
> >0x44c lelong x rev %d
> >0x43e leshort x \b.%d
> # No journal? ext2
> >0x45c lelong ^0x0000004 ext2 filesystem data
> >>0x43a leshort ^0x0000001 (mounted or unclean)
> # Has a journal? ext3 or ext4
> >0x45c lelong &0x0000004
> # and small INCOMPAT?
> >>0x460 lelong <0x0000040
> # and small RO_COMPAT?
> >>>0x464 lelong <0x0000008 ext3 filesystem data
> # else large RO_COMPAT?
> >>>0x464 lelong >0x0000007 ext4 filesystem data
> # else large INCOMPAT?
> >>0x460 lelong >0x000003f ext4 filesystem data
> # General flags for any ext* fs
> >0x460 lelong &0x0000004 (needs journal recovery)
> >0x43a leshort &0x0000002 (errors)
> # INCOMPAT flags
> >0x460 lelong &0x0000001 (compressed)
> #>0x460 lelong &0x0000002 (filetype)
> #>0x460 lelong &0x0000010 (meta bg)
> >0x460 lelong &0x0000040 (extents)
> >0x460 lelong &0x0000080 (64bit)
> #>0x460 lelong &0x0000100 (mmp)
> #>0x460 lelong &0x0000200 (flex bg)
> # RO_INCOMPAT flags
> #>0x464 lelong &0x0000001 (sparse super)
> >0x464 lelong &0x0000002 (large files)
> >0x464 lelong &0x0000008 (huge files)
> #>0x464 lelong &0x0000010 (gdt checksum)
> #>0x464 lelong &0x0000020 (many subdirs)
> #>0x463 lelong &0x0000040 (extra isize)
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.