ceph: don't list vxattrs in listxattr()

Most filesystems that provide virtual xattrs (e.g. CIFS) don't display
them via listxattr(). Ceph does, and that causes some of the tests in
xfstests to fail.

Have cephfs stop listing vxattrs in listxattr. Userspace can always
query them directly when the name is known.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Acked-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/xattr.c

@@ -903,11 +903,9 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
 {
 	struct inode *inode = d_inode(dentry);
 	struct ceph_inode_info *ci = ceph_inode(inode);
-	struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
 	bool len_only = (size == 0);
 	u32 namelen;
 	int err;
-	int i;
 
 	spin_lock(&ci->i_ceph_lock);
 	dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
@@ -936,33 +934,6 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
 		names = __copy_xattr_names(ci, names);
 		size -= namelen;
 	}
-
-
-	/* virtual xattr names, too */
-	if (vxattrs) {
-		for (i = 0; vxattrs[i].name; i++) {
-			size_t this_len;
-
-			if (vxattrs[i].flags & VXATTR_FLAG_HIDDEN)
-				continue;
-			if (vxattrs[i].exists_cb && !vxattrs[i].exists_cb(ci))
-				continue;
-
-			this_len = strlen(vxattrs[i].name) + 1;
-			namelen += this_len;
-			if (len_only)
-				continue;
-
-			if (this_len > size) {
-				err = -ERANGE;
-				goto out;
-			}
-
-			memcpy(names, vxattrs[i].name, this_len);
-			names += this_len;
-			size -= this_len;
-		}
-	}
 	err = namelen;
 out:
 	spin_unlock(&ci->i_ceph_lock);