On Wed, Dec 30, 2020 at 08:02:52AM -0500, Sasha Levin wrote: > From: Daniel Rosenberg <drosen@xxxxxxxxxx> > > [ 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 <ebiggers@xxxxxxxxxx> > and Jaegeuk Kim <jaegeuk@xxxxxxxxxx>. > > Co-developed-by: Eric Biggers <ebiggers@xxxxxxxxxx> > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> > Signed-off-by: Daniel Rosenberg <drosen@xxxxxxxxxx> > Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx> > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> Please don't backport this to the LTS kernels. This is a new feature, not a fix, and you missed prerequisite patches... - Eric
