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 <adilger@xxxxxxxxxxxxx> 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) - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
