On Wed, Dec 30, 2020 at 10:01:56AM -0800, Eric Biggers wrote:

On Wed, Dec 30, 2020 at 08:02:52AM -0500, Sasha Levin wrote:

quoted

From: Daniel Rosenberg <redacted>

[ Upstream commit 7ad08a58bf67594057362e45cbddd3e27e53e557 ]

Expand f2fs's casefolding support to include encrypted directories.  To
index casefolded+encrypted directories, we use the SipHash of the
casefolded name, keyed by a key derived from the directory's fscrypt
master key.  This ensures that the dirhash doesn't leak information
about the plaintext filenames.

Encryption keys are unavailable during roll-forward recovery, so we
can't compute the dirhash when recovering a new dentry in an encrypted +
casefolded directory.  To avoid having to force a checkpoint when a new
file is fsync'ed, store the dirhash on-disk appended to i_name.

This patch incorporates work by Eric Biggers [off-list ref]
and Jaegeuk Kim [off-list ref].

Co-developed-by: Eric Biggers <redacted>
Signed-off-by: Eric Biggers <redacted>
Signed-off-by: Daniel Rosenberg <redacted>
Reviewed-by: Eric Biggers <redacted>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Please don't backport this to the LTS kernels.  This is a new feature, not a
fix, and you missed prerequisite patches...

Sure, I'l drop it. Thanks!

-- 
Thanks,
Sasha