ceph: Translate inode uid and gid attributes to/from kuids and kgids.

- In fill_inode() transate uids and gids in the initial user namespace
  into kuids and kgids stored in inode->i_uid and inode->i_gid.

- In ceph_setattr() if they have changed convert inode->i_uid and
  inode->i_gid into initial user namespace uids and gids for
  transmission.

Cc: Sage Weil <sage@inktank.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 2971eaa65cdc..40e0787022e9 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -612,8 +612,8 @@ static int fill_inode(struct inode *inode,
 
         if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
                 inode->i_mode = le32_to_cpu(info->mode);
-                inode->i_uid = le32_to_cpu(info->uid);
-                inode->i_gid = le32_to_cpu(info->gid);
+                inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
+                inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
                      inode->i_uid, inode->i_gid);
         }
@@ -1570,8 +1570,9 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
                         inode->i_uid = attr->ia_uid;
                         dirtied |= CEPH_CAP_AUTH_EXCL;
                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
-                           attr->ia_uid != inode->i_uid) {
-                        req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
+                           !uid_eq(attr->ia_uid, inode->i_uid)) {
+                        req->r_args.setattr.uid = cpu_to_le32(
+                                from_kuid(&init_user_ns, attr->ia_uid));
                         mask |= CEPH_SETATTR_UID;
                         release |= CEPH_CAP_AUTH_SHARED;
                 }
@@ -1583,8 +1584,9 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
                         inode->i_gid = attr->ia_gid;
                         dirtied |= CEPH_CAP_AUTH_EXCL;
                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
-                           attr->ia_gid != inode->i_gid) {
-                        req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
+                           !gid_eq(attr->ia_gid, inode->i_gid)) {
+                        req->r_args.setattr.gid = cpu_to_le32(
+                                from_kgid(&init_user_ns, attr->ia_gid));
                         mask |= CEPH_SETATTR_GID;
                         release |= CEPH_CAP_AUTH_SHARED;
                 }