1 files changed, 126 insertions, 0 deletions
diff --git a/src/mds/locks.h b/src/mds/locks.h
new file mode 100644
index 000000000..e6fdc1cfc
--- /dev/null
+++ b/src/mds/locks.h
@@ -0,0 +1,126 @@
+#ifndef CEPH_MDS_LOCKS_H
+#define CEPH_MDS_LOCKS_H
+#include <stdbool.h>
+
+struct sm_state_t {
+  int next;         // 0 if stable
+  bool loner;
+  int replica_state;
+  char can_read;
+  char can_read_projected;
+  char can_rdlock;
+  char can_wrlock;
+  char can_force_wrlock;
+  char can_lease;
+  char can_xlock;
+  int caps;
+  int loner_caps;
+  int xlocker_caps;
+  int replica_caps;
+};
+
+struct sm_t {
+  const struct sm_state_t *states;
+  int allowed_ever_auth;
+  int allowed_ever_replica;
+  int careful;
+  int can_remote_xlock;
+};
+
+#define ANY  1 // auth or replica
+#define AUTH 2 // auth only
+#define XCL  3 // auth or exclusive client
+//#define FW   4 // fw to auth, if replica
+#define REQ  5 // req state change from auth, if replica
+
+extern const struct sm_t sm_simplelock;
+extern const struct sm_t sm_filelock;
+extern const struct sm_t sm_scatterlock;
+extern const struct sm_t sm_locallock;
+
+
+
+// -- lock states --
+// sync <-> lock
+enum {
+  LOCK_UNDEF = 0,
+
+  //                                    auth               rep
+  LOCK_SYNC,    // AR   R . RD L . / C .   R RD L . / C . 
+  LOCK_LOCK,    // AR   R . .. . X / . .   . .. . . / . .
+
+  LOCK_PREXLOCK,    // A    . . .. . . / . .   (lock)
+  LOCK_XLOCK,       // A    . . .. . . / . .   (lock)
+  LOCK_XLOCKDONE,   // A    r p rd l x / . .   (lock)  <-- by same client only!!
+  LOCK_XLOCKSNAP,   // also revoke Fb
+  LOCK_LOCK_XLOCK,
+
+  LOCK_SYNC_LOCK,    // AR   R . .. . . / . .   R .. . . / . .
+  LOCK_LOCK_SYNC,    // A    R p rd l . / . .   (lock)  <-- lc by same client only
+
+  LOCK_EXCL,         // A    . . .. . . / c x * (lock)
+  LOCK_EXCL_SYNC,    // A    . . .. . . / c . * (lock)
+  LOCK_EXCL_LOCK,    // A    . . .. . . / . .   (lock)
+  LOCK_SYNC_EXCL,    // Ar   R . .. . . / c . * (sync->lock)
+  LOCK_LOCK_EXCL,    // A    R . .. . . / . .   (lock)
+
+  LOCK_REMOTEXLOCK,  // on NON-auth
+
+  // * = loner mode
+
+  LOCK_MIX,
+  LOCK_SYNC_MIX,
+  LOCK_SYNC_MIX2,
+  LOCK_LOCK_MIX,
+  LOCK_EXCL_MIX,
+  LOCK_MIX_SYNC,
+  LOCK_MIX_SYNC2,
+  LOCK_MIX_LOCK,
+  LOCK_MIX_LOCK2,
+  LOCK_MIX_EXCL,
+
+  LOCK_TSYN,
+  LOCK_TSYN_LOCK,
+  LOCK_TSYN_MIX,
+  LOCK_LOCK_TSYN,
+  LOCK_MIX_TSYN,
+
+  LOCK_PRE_SCAN,
+  LOCK_SCAN,
+
+  LOCK_SNAP_SYNC,
+
+  LOCK_XSYN,
+  LOCK_XSYN_EXCL,
+  LOCK_EXCL_XSYN,
+  LOCK_XSYN_SYNC,
+  LOCK_XSYN_LOCK,
+  LOCK_XSYN_MIX,
+
+  LOCK_MAX,
+};
+
+// -------------------------
+// lock actions
+
+// for replicas
+#define LOCK_AC_SYNC        -1
+#define LOCK_AC_MIX         -2
+#define LOCK_AC_LOCK        -3
+#define LOCK_AC_LOCKFLUSHED -4
+
+// for auth
+#define LOCK_AC_SYNCACK      1
+#define LOCK_AC_MIXACK     2
+#define LOCK_AC_LOCKACK      3
+
+#define LOCK_AC_REQSCATTER   7
+#define LOCK_AC_REQUNSCATTER 8
+#define LOCK_AC_NUDGE        9
+#define LOCK_AC_REQRDLOCK   10
+
+#define LOCK_AC_FOR_REPLICA(a)  ((a) < 0)
+#define LOCK_AC_FOR_AUTH(a)     ((a) > 0)
+
+
+#endif