[PATCH 27/36] ceph: don't allow changing layout on encrypted files/directories

Jeff Layton
2021-12-09T15:37:45Z

From: Luis Henriques <lhenriques@suse.de>

Encryption is currently only supported on files/directories with layouts
where stripe_count=1. Forbid changing layouts when encryption is involved.

Signed-off-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/ioctl.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index 477ecc667aee..480d18bb2ff0 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -294,6 +294,10 @@ static long ceph_set_encryption_policy(struct file *file, unsigned long arg)
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);

+ /* encrypted directories can't have striped layout */
+ if (ci->i_layout.stripe_count > 1)
+ return -EINVAL;
+
ret = vet_mds_for_fscrypt(file);
if (ret)
return ret;
--
2.33.1