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From: Gabriel Krisman Bertazi <krisman@suse.de>
To: ebiggers@kernel.org,
	viro@zeniv.linux.org.uk,
	jaegeuk@kernel.org,
	tytso@mit.edu
Cc: amir73il@gmail.com,
	linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org,
	Gabriel Krisman Bertazi <krisman@suse.de>
Subject: [PATCH v4 00/12] Set casefold/fscrypt dentry operations through sb->s_d_op
Date: Fri, 26 Jan 2024 21:10:00 -0300
Message-ID: <20240127001013.2845-1-krisman@suse.de>
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Hi,

The v4 of this patchset addresses the issues Eric pointed out in the
previous version.  The patch merging the fscrypt lookup helpers was
completely rewritten to avoid the race condition; We also now return
immediately from __fscrypt_handle_d_move; Finally, the overlayfs patch
message was improved.  Further details can be found on the changelog of
each patch.

As usual, this survived fstests on ext4 and f2fs.

---
original cover letter:

When case-insensitive and fscrypt were adapted to work together, we moved the
code that sets the dentry operations for case-insensitive dentries(d_hash and
d_compare) to happen from a helper inside ->lookup.  This is because fscrypt
wants to set d_revalidate only on some dentries, so it does it only for them in
d_revalidate.

But, case-insensitive hooks are actually set on all dentries in the filesystem,
so the natural place to do it is through s_d_op and let d_alloc handle it [1].
In addition, doing it inside the ->lookup is a problem for case-insensitive
dentries that are not created through ->lookup, like those coming
open-by-fhandle[2], which will not see the required d_ops.

This patchset therefore reverts to using sb->s_d_op to set the dentry operations
for case-insensitive filesystems.  In order to set case-insensitive hooks early
and not require every dentry to have d_revalidate in case-insensitive
filesystems, it introduces a patch suggested by Al Viro to disable d_revalidate
on some dentries on the fly.

It survives fstests encrypt and quick groups without regressions.  Based on
v6.7-rc1.

[1] https://lore.kernel.org/linux-fsdevel/20231123195327.GP38156@ZenIV/
[2] https://lore.kernel.org/linux-fsdevel/20231123171255.GN38156@ZenIV/

Gabriel Krisman Bertazi (12):
  ovl: Reject mounting over case-insensitive directories
  fscrypt: Factor out a helper to configure the lookup dentry
  fscrypt: Call fscrypt_prepare_lookup_dentry on unencrypted dentries
  fscrypt: Drop d_revalidate for valid dentries during lookup
  fscrypt: Drop d_revalidate once the key is added
  fscrypt: Ignore non-fscrypt volumes during d_move
  libfs: Merge encrypted_ci_dentry_ops and ci_dentry_ops
  libfs: Add helper to choose dentry operations at mount-time
  ext4: Configure dentry operations at dentry-creation time
  f2fs: Configure dentry operations at dentry-creation time
  ubifs: Configure dentry operations at dentry-creation time
  libfs: Drop generic_set_encrypted_ci_d_ops

 fs/crypto/hooks.c       | 28 ++++-----------
 fs/ext4/namei.c         |  1 -
 fs/ext4/super.c         |  1 +
 fs/f2fs/namei.c         |  1 -
 fs/f2fs/super.c         |  1 +
 fs/libfs.c              | 62 +++++++++-----------------------
 fs/overlayfs/params.c   | 14 ++++++--
 fs/ubifs/dir.c          |  1 -
 fs/ubifs/super.c        |  1 +
 include/linux/fs.h      | 11 +++++-
 include/linux/fscrypt.h | 78 +++++++++++++++++++++++++++++------------
 11 files changed, 103 insertions(+), 96 deletions(-)

-- 
2.43.0