linux-kernel - [PATCH v2 2/3] ceph: add missing cpu_to_le32() calls when encoding a reconnect capability

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Date:	Wed, 15 May 2013 10:38:13 -0600
From:	"Jim Schutt" <jaschut@...dia.gov>
To:	elder@...tank.com
cc:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Jim Schutt" <jaschut@...dia.gov>
Subject: [PATCH v2 2/3] ceph: add missing 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.

Signed-off-by: Jim Schutt <jaschut@...dia.gov>
---
 fs/ceph/locks.c      |    7 +++++--
 fs/ceph/mds_client.c |    2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index ffc86cb..4518313 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 4f22671..d9ca152 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();
-- 
1.7.8.2


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