Ceph » Linux kernel client

All right, designed a basic interface between the client and the MDS. Going to implement the MDS and messaging parts for an MDS-only solution.

BTW these should all be __le32 etc. if the values go over the wire. And the kclient code that uses them needs to use cpu_to_le##, le##_to_cpu (userspace does the endian conversion magically).

+       struct {
+               __u8 rule; /* currently fcntl or flock */
+               __u8 type; /* shared, exclusive, remove*/
+               __u64 pid; /* process id requesting the lock */
+               __u64 pid_namespace;
+               __u64 start; /* initial location to lock */
+               __u64 length; /* num bytes to lock from start */
+               __u8 wait; /* will caller wait for lock to become available? */
+       } __attribute__ ((packed)) filelock_change;
 } __attribute__ ((packed));

 #define CEPH_MDS_FLAG_REPLAY        1  /* this is a replayed op */
@@ -481,6 +494,23 @@ struct ceph_mds_reply_dirfrag {
        __le32 dist[];
 } __attribute__ ((packed));

...

+struct ceph_filelock {
+       __u64 start;/* file offset to start lock at */
+       __u64 length; /* num bytes to lock; 0 for all following start */
+       __s64 client; /* which client holds the lock */
+       __u64 pid; /* process id holding the lock on the client */
+       __u64 pid_namespace;
+       __u8 type; /* shared lock, exclusive lock, or unlock */
+} __attribute__ ((packed));

Hmm, this was halfway done before but it's in properly now.