On Fri, 2022-03-04 at 16:14 +0000, Luís Henriques wrote:
> 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@xxxxxxx>
> ---
> 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 934402f5e9e6..17d2f18a1fd1 100644
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -1069,6 +1069,15 @@ 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 8b0832271fdf..357335a11384 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");
Should we return an error in this case?
> + }
> if (inode->i_state & I_NEW) {
> inode->i_op = &ceph_snapdir_iops;
> inode->i_fop = &ceph_snapdir_fops;
Seems simple and straightforward at first glance.
--
Jeff Layton <jlayton@xxxxxxxxxx>
