Re: [GIT PULL] f2fs updates for v4.6

[Eric Biggers]

Why was the XTS tweak initialization changed in commit 0b81d0779072 ("fs crypto:
move per-file encryption from f2fs tree to fs/crypto")?

Old code:

       memcpy(xts_tweak, &index, sizeof(index));
       memset(&xts_tweak[sizeof(index)], 0,
                       F2FS_XTS_TWEAK_SIZE - sizeof(index));

New code:
       memcpy(xts_tweak, &inode->i_ino, sizeof(index));
       memset(&xts_tweak[sizeof(index)], 0,
                       FS_XTS_TWEAK_SIZE - sizeof(index));

Now the XTS tweak is the same for all pages of each inode.