ceph: add flock/fcntl lock support

Implement flock inode operation to support advisory file locking.  All
lock/unlock operations are synchronous with the MDS.  Lock state is
sent when reconnecting to a recovering MDS to restore the shared lock
state.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 83f7cc5fab10..95adce441cc0 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -892,6 +892,14 @@ extern void ceph_debugfs_cleanup(void);
 extern int ceph_debugfs_client_init(struct ceph_client *client);
 extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
 
+/* locks.c */
+extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
+extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
+extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
+extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
+                             int p_locks, int f_locks);
+extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
+
 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry)
 {
         if (dentry && dentry->d_parent)