The directory names are not enciphered, they are replaced by unique
filenames AAA, BAA, CAA, DAA, etc.
The relevant section of code is:
memset(cp, 'A', dirent->name_len);
len = dirent->name_len;
id = name_id[len]++;
while ((len > 0) && (id > 0)) {
*cp += id % 26;
id = id / 26;
cp++;
len--;
}
note the first thing done is to replace the file name with 'AAAA...'.
The rest is to change it up so the filenames are unique.
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https://bugs.launchpad.net/bugs/711799
Title:
e2fsprogs wrongly identifies ext4 as mounted
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