ceph: use fl->fl_file as owner identifier of flock and posix lock

flock and posix lock should use fl->fl_file instead of process ID
as owner identifier. (posix lock uses fl->fl_owner. fl->fl_owner
is usually equal to fl->fl_file, but it also can be a customized
value). The process ID of who holds the lock is just for F_GETLK
fcntl(2).

The fix is rename the 'pid' fields of struct ceph_mds_request_args
and struct ceph_filelock to 'owner', rename 'pid_namespace' fields
to 'pid'. Assign fl->fl_file to the 'owner' field of lock messages.
We also set the most significant bit of the 'owner' field. MDS can
use that bit to distinguish between old and new clients.

The MDS counterpart of this patch modifies the flock code to not
take the 'pid_namespace' into consideration when checking conflict
locks.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 35f345f..5f6db18 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -421,8 +421,8 @@ union ceph_mds_request_args {
 	struct {
 		__u8 rule; /* currently fcntl or flock */
 		__u8 type; /* shared, exclusive, remove*/
+		__le64 owner; /* owner of the lock */
 		__le64 pid; /* process id requesting the lock */
-		__le64 pid_namespace;
 		__le64 start; /* initial location to lock */
 		__le64 length; /* num bytes to lock from start */
 		__u8 wait; /* will caller wait for lock to become available? */
@@ -533,8 +533,8 @@ struct ceph_filelock {
 	__le64 start;/* file offset to start lock at */
 	__le64 length; /* num bytes to lock; 0 for all following start */
 	__le64 client; /* which client holds the lock */
+	__le64 owner; /* owner the lock */
 	__le64 pid; /* process id holding the lock on the client */
-	__le64 pid_namespace;
 	__u8 type; /* shared lock, exclusive lock, or unlock */
 } __attribute__ ((packed));