linux-kernel - [RFC PATCH 1/2] ceph: add support for encrypted snapshot names

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Message-Id: <20220310172616.16212-2-lhenriques@suse.de>
Date:   Thu, 10 Mar 2022 17:26:15 +0000
From:   Luís Henriques <lhenriques@...e.de>
To:     Jeff Layton <jlayton@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>
Subject: [RFC PATCH 1/2] ceph: add support for encrypted snapshot names

Since filenames in encrypted directories are already encrypted and shown
as a base64-encoded string when the directory is locked, snapshot names
should show a similar behaviour.

Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
 fs/ceph/dir.c   |  9 +++++++++
 fs/ceph/inode.c | 13 +++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 6df2a91af236..123e3b9c8161 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1075,6 +1075,15 @@ static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 		op = CEPH_MDS_OP_MKSNAP;
 		dout("mksnap dir %p snap '%pd' dn %p\n", dir,
 		     dentry, dentry);
+		/*
+		 * Encrypted snapshots require d_revalidate to force a
+		 * LOOKUPSNAP to cleanup dcache
+		 */
+		if (IS_ENCRYPTED(dir)) {
+			spin_lock(&dentry->d_lock);
+			dentry->d_flags |= DCACHE_NOKEY_NAME;
+			spin_unlock(&dentry->d_lock);
+		}
 	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
 		dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
 		op = CEPH_MDS_OP_MKDIR;
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index b573a0f33450..81d3d554d261 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -182,6 +182,19 @@ struct inode *ceph_get_snapdir(struct inode *parent)
 	ci->i_rbytes = 0;
 	ci->i_btime = ceph_inode(parent)->i_btime;
 
+	/* if encrypted, just borrow fscrypt_auth from parent */
+	if (IS_ENCRYPTED(parent)) {
+		struct ceph_inode_info *pci = ceph_inode(parent);
+
+		ci->fscrypt_auth = kmemdup(pci->fscrypt_auth,
+					   pci->fscrypt_auth_len,
+					   GFP_KERNEL);
+		if (ci->fscrypt_auth) {
+			inode->i_flags |= S_ENCRYPTED;
+			ci->fscrypt_auth_len = pci->fscrypt_auth_len;
+		} else
+			dout("Failed to alloc memory for fscrypt_auth in snapdir\n");
+	}
 	if (inode->i_state & I_NEW) {
 		inode->i_op = &ceph_snapdir_iops;
 		inode->i_fop = &ceph_snapdir_fops;