ceph: define on-wire types, constants for file locking support

Define the MDS operations and data types for doing file advisory locking
with the MDS.

Signed-off-by: Greg Farnum <gregf@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

2 files changed, 36 insertions, 2 deletions

diff --git a/fs/ceph/ceph_fs.h b/fs/ceph/ceph_fs.h
index bb17a18cc190..d5619ac86711 100644
--- a/fs/ceph/ceph_fs.h
+++ b/fs/ceph/ceph_fs.h
@@ -297,6 +297,8 @@ enum {
         CEPH_MDS_OP_RMXATTR    = 0x01106,
         CEPH_MDS_OP_SETLAYOUT  = 0x01107,
         CEPH_MDS_OP_SETATTR    = 0x01108,
+        CEPH_MDS_OP_SETFILELOCK= 0x01109,
+        CEPH_MDS_OP_GETFILELOCK= 0x00110,
 
         CEPH_MDS_OP_MKNOD      = 0x01201,
         CEPH_MDS_OP_LINK       = 0x01202,
@@ -367,6 +369,15 @@ union ceph_mds_request_args {
         struct {
                 struct ceph_file_layout layout;
         } __attribute__ ((packed)) setlayout;
+        struct {
+                __u8 rule; /* currently fcntl or flock */
+                __u8 type; /* shared, exclusive, remove*/
+                __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? */
+        } __attribute__ ((packed)) filelock_change;
 } __attribute__ ((packed));
 
 #define CEPH_MDS_FLAG_REPLAY        1  /* this is a replayed op */
@@ -461,6 +472,23 @@ struct ceph_mds_reply_dirfrag {
         __le32 dist[];
 } __attribute__ ((packed));
 
+#define CEPH_LOCK_FCNTL    1
+#define CEPH_LOCK_FLOCK    2
+
+#define CEPH_LOCK_SHARED   1
+#define CEPH_LOCK_EXCL     2
+#define CEPH_LOCK_UNLOCK   4
+
+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 pid; /* process id holding the lock on the client */
+        __le64 pid_namespace;
+        __u8 type; /* shared lock, exclusive lock, or unlock */
+} __attribute__ ((packed));
+
+
 /* file access modes */
 #define CEPH_FILE_MODE_PIN        0
 #define CEPH_FILE_MODE_RD         1
@@ -489,9 +517,10 @@ int ceph_flags_to_mode(int flags);
 #define CEPH_CAP_SAUTH      2
 #define CEPH_CAP_SLINK      4
 #define CEPH_CAP_SXATTR     6
-#define CEPH_CAP_SFILE      8   /* goes at the end (uses >2 cap bits) */
+#define CEPH_CAP_SFILE      8
+#define CEPH_CAP_SFLOCK    20 
 
-#define CEPH_CAP_BITS       16
+#define CEPH_CAP_BITS       22
 
 /* composed values */
 #define CEPH_CAP_AUTH_SHARED  (CEPH_CAP_GSHARED  << CEPH_CAP_SAUTH)
@@ -509,6 +538,9 @@ int ceph_flags_to_mode(int flags);
 #define CEPH_CAP_FILE_BUFFER   (CEPH_CAP_GBUFFER   << CEPH_CAP_SFILE)
 #define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
 #define CEPH_CAP_FILE_LAZYIO   (CEPH_CAP_GLAZYIO   << CEPH_CAP_SFILE)
+#define CEPH_CAP_FLOCK_SHARED  (CEPH_CAP_GSHARED   << CEPH_CAP_SFLOCK)
+#define CEPH_CAP_FLOCK_EXCL    (CEPH_CAP_GEXCL     << CEPH_CAP_SFLOCK)
+
 
 /* cap masks (for getattr) */
 #define CEPH_STAT_CAP_INODE    CEPH_CAP_PIN
diff --git a/fs/ceph/ceph_strings.c b/fs/ceph/ceph_strings.c
index 0f943a0a3b5e..c6179d3a26a2 100644
--- a/fs/ceph/ceph_strings.c
+++ b/fs/ceph/ceph_strings.c
@@ -130,6 +130,8 @@ const char *ceph_mds_op_name(int op)
         case CEPH_MDS_OP_LSSNAP: return "lssnap";
         case CEPH_MDS_OP_MKSNAP: return "mksnap";
         case CEPH_MDS_OP_RMSNAP: return "rmsnap";
+        case CEPH_MDS_OP_SETFILELOCK: return "setfilelock";
+        case CEPH_MDS_OP_GETFILELOCK: return "getfilelock";
         }
         return "???";
 }