[fscrypt][RFC PATCH v2] ceph: don't allow changing layout on encrypted files/directories
From: Luis Henriques
Date: Tue Aug 17 2021 - 10:04:51 EST
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@xxxxxxx>
---
Changes since v1:
- dropped changes to ceph_sync_setxattr(), MDS shall be responsible for
preventing layout changes on encrypted dirs/files
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;