ceph: add cpu_to_le32() calls when encoding a reconnect capability

In his review, Alex Elder mentioned that he hadn't checked that
num_fcntl_locks and num_flock_locks were properly decoded on the
server side, from a le32 over-the-wire type to a cpu type.
I checked, and AFAICS it is done; those interested can consult
    Locker::_do_cap_update()
in src/mds/Locker.cc and src/include/encoding.h in the Ceph server
code (git://github.com/ceph/ceph).

I also checked the server side for flock_len decoding, and I believe
that also happens correctly, by virtue of having been declared
__le32 in struct ceph_mds_cap_reconnect, in src/include/ceph_fs.h.

Cc: stable@vger.kernel.org # 3.4+
Signed-off-by: Jim Schutt <jaschut@sandia.gov>
Reviewed-by: Alex Elder <elder@inktank.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index 202dd3d68be0..a80ed18d64ff 100644
--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -206,10 +206,12 @@ int ceph_encode_locks(struct inode *inode, struct ceph_pagelist *pagelist,
         int err = 0;
         int seen_fcntl = 0;
         int seen_flock = 0;
+        __le32 nlocks;
 
         dout("encoding %d flock and %d fcntl locks", num_flock_locks,
              num_fcntl_locks);
-        err = ceph_pagelist_append(pagelist, &num_fcntl_locks, sizeof(u32));
+        nlocks = cpu_to_le32(num_fcntl_locks);
+        err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
         if (err)
                 goto fail;
         for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
@@ -229,7 +231,8 @@ int ceph_encode_locks(struct inode *inode, struct ceph_pagelist *pagelist,
                         goto fail;
         }
 
-        err = ceph_pagelist_append(pagelist, &num_flock_locks, sizeof(u32));
+        nlocks = cpu_to_le32(num_flock_locks);
+        err = ceph_pagelist_append(pagelist, &nlocks, sizeof(nlocks));
         if (err)
                 goto fail;
         for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 4f22671a5bd4..d9ca15255477 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2485,7 +2485,7 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
                         lock_flocks();
                         ceph_count_locks(inode, &num_fcntl_locks,
                                          &num_flock_locks);
-                        rec.v2.flock_len = (2*sizeof(u32) +
+                        rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
                                             (num_fcntl_locks+num_flock_locks) *
                                             sizeof(struct ceph_filelock));
                         unlock_flocks();