Pull fscrypt updates from Eric Biggers:
 "Fix flakiness in a test by releasing the quota synchronously when a
  key is removed, and other minor cleanups"

* tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/linux:
  fscrypt: shrink the size of struct fscrypt_inode_info slightly
  fscrypt: write CBC-CTS instead of CTS-CBC
  fscrypt: clear keyring before calling key_put()
  fscrypt: explicitly require that inode->i_blkbits be set

Merge case-insensitive updates from Gabriel Krisman Bertazi:

- Patch case-insensitive lookup by trying the case-exact comparison
  first, before falling back to costly utf8 casefolded comparison.

- Fix to forbid using a case-insensitive directory as part of an
  overlayfs mount.

- Patchset to ensure d_op are set at d_alloc time for fscrypt and
  casefold volumes, ensuring filesystem dentries will all have the
  correct ops, whether they come from a lookup or not.

* tag 'for-next-6.9' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/krisman/unicode:
  libfs: Drop generic_set_encrypted_ci_d_ops
  ubifs: Configure dentry operations at dentry-creation time
  f2fs: Configure dentry operations at dentry-creation time
  ext4: Configure dentry operations at dentry-creation time
  libfs: Add helper to choose dentry operations at mount-time
  libfs: Merge encrypted_ci_dentry_ops and ci_dentry_ops
  fscrypt: Drop d_revalidate once the key is added
  fscrypt: Drop d_revalidate for valid dentries during lookup
  fscrypt: Factor out a helper to configure the lookup dentry
  ovl: Always reject mounting over case-insensitive directories
  libfs: Attempt exact-match comparison first during casefolded lookup

Signed-off-by: Christian Brauner <brauner@kernel.org>

Both fscrypt_prepare_lookup_partial and fscrypt_prepare_lookup will set
DCACHE_NOKEY_NAME for dentries when the key is not available. Extract
out a helper to set this flag in a single place, in preparation to also
add the optimization that will disable ->d_revalidate if possible.

Reviewed-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20240221171412.10710-3-krisman@suse.de
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>

Shrink the size of struct fscrypt_inode_info by 8 bytes by packing the
small fields into the 64 bits after ci_enc_key.

Link: https://lore.kernel.org/r/20240224060103.91037-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

Calling CBC with ciphertext stealing "CBC-CTS" seems to be more common
than calling it "CTS-CBC".  E.g., CBC-CTS is used by OpenSSL, Crypto++,
RFC3962, and RFC6803.  The NIST SP800-38A addendum uses CBC-CS1,
CBC-CS2, and CBC-CS3, distinguishing between different CTS conventions
but similarly putting the CBC part first.  In the interest of avoiding
any idiosyncratic terminology, update the fscrypt documentation and the
fscrypt_mode "friendly names" to align with the more common convention.

Changing the "friendly names" only affects some log messages.  The
actual mode constants in the API are unchanged; those call it simply
"CTS".  Add a note to the documentation that clarifies that "CBC" and
"CTS" in the API really mean CBC-ESSIV and CBC-CTS, respectively.

Link: https://lore.kernel.org/r/20240224053550.44659-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

Now that the key quotas are handled immediately on key_put() instead of
being postponed to the key management garbage collection worker, a call
to keyring_clear() is all that is required in fscrypt_put_master_key()
so that the keyring clean-up is also done synchronously.  This patch
should fix the fstest generic/581 flakiness.

Signed-off-by: Luis Henriques <lhenriques@suse.de>
Link: https://lore.kernel.org/r/20240206101619.8083-1-lhenriques@suse.de
[ebiggers: added comment]
Signed-off-by: Eric Biggers <ebiggers@google.com>

Document that fscrypt_prepare_new_inode() requires inode->i_blkbits to
be set, and make it WARN if it's not.  This would have made the CephFS
bug https://tracker.ceph.com/issues/64035 a bit easier to debug.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Link: https://lore.kernel.org/r/20240201003525.1788594-1-xiubli@redhat.com
Signed-off-by: Eric Biggers <ebiggers@google.com>

Merge exportfs fixes from Chuck Lever:

* tag 'exportfs-6.9' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  fs: Create a generic is_dot_dotdot() utility
  exportfs: fix the fallback implementation of the get_name export operation

Link: https://lore.kernel.org/r/BDC2AEB4-7085-4A7C-8DE8-A659FE1DBA6A@oracle.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

De-duplicate the same functionality in several places by hoisting
the is_dot_dotdot() utility function into linux/fs.h.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

The help text for CONFIG_FS_ENCRYPTION and the fscrypt.rst documentation
file both list the filesystems that support fscrypt.  CephFS added
support for fscrypt in v6.6, so add CephFS to the list.

Link: https://lore.kernel.org/r/20231227045158.87276-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>