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[RFC,v10,26/48] ceph: don't allow changing layout on encrypted files/directories

Message ID 20220111191608.88762-27-jlayton@kernel.org (mailing list archive)
State New, archived
Headers show
Series ceph+fscrypt: full support | expand

Commit Message

Jeff Layton Jan. 11, 2022, 7:15 p.m. UTC
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(+)
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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;