linux-kernel - [PATCH v3 2/3] ceph: switch ceph_open() to use new fscrypt helper

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Date:   Thu, 16 Mar 2023 18:14:12 +0000
From:   Luís Henriques <lhenriques@...e.de>
To:     Eric Biggers <ebiggers@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        Jeff Layton <jlayton@...nel.org>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-fscrypt@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>
Subject: [PATCH v3 2/3] ceph: switch ceph_open() to use new fscrypt helper

Instead of setting the no-key dentry in ceph_lookup(), use the new
fscrypt_prepare_lookup_partial() helper.  We still need to mark the
directory as incomplete if the directory was just unlocked.

Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
 fs/ceph/dir.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index d8cc6e9d5351..836bc695e2e0 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -784,14 +784,15 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
 		return ERR_PTR(-ENAMETOOLONG);
 
 	if (IS_ENCRYPTED(dir)) {
-		err = ceph_fscrypt_prepare_readdir(dir);
+		bool had_key = fscrypt_has_encryption_key(dir);
+
+		err = fscrypt_prepare_lookup_partial(dir, dentry);
 		if (err < 0)
 			return ERR_PTR(err);
-		if (!fscrypt_has_encryption_key(dir)) {
-			spin_lock(&dentry->d_lock);
-			dentry->d_flags |= DCACHE_NOKEY_NAME;
-			spin_unlock(&dentry->d_lock);
-		}
+
+		/* mark directory as incomplete if it has been unlocked */
+		if (!had_key && fscrypt_has_encryption_key(dir))
+			ceph_dir_clear_complete(dir);
 	}
 
 	/* can we conclude ENOENT locally? */