From: Jeff Layton <jlayton@redhat.com>
Date: Mon, 23 Oct 2017 10:58:40 -0400
Subject: ceph: present consistent fsid, regardless of arch endianness
Git-commit: 080a330e1d9142b9d958a40dcef3ae5ae5d8820a
Patch-mainline: v4.15-rc1
References: FATE#324714

Since its inception, ceph has presented the fsid as an opaque value
without any sort of endianness conversion. This means that the value
presented is different on architectures of different endianness.

While the value that should be stuffed into f_fsid is poorly-defined,
I think it would be best to strive for consistency here between
architectures, and clients (we need to present this properly to the
userland client as well).

Change ceph_statfs to convert the opaque words to host-endian before
doing the xor. On an upgrade, a big-endian box may see a different fsid
than it did before, but little-endian arches should see no change with
this patch.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index e4082afedcb1..fe9fbb3f13f7 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -84,8 +84,9 @@ static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_ffree = -1;
 	buf->f_namelen = NAME_MAX;
 
-	/* leave fsid little-endian, regardless of host endianness */
-	fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
+	/* Must convert the fsid, for consistent values across arches */
+	fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^
+	       le64_to_cpu(*((__le64 *)&monmap->fsid + 1));
 	buf->f_fsid.val[0] = fsid & 0xffffffff;
 	buf->f_fsid.val[1] = fsid >> 32;