AFS: implement file locking

Implement file locking for AFS.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 2c55dd94a1de..6306438f331f 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -351,10 +351,18 @@ struct afs_vnode {
 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
+#define AFS_VNODE_LOCKING       6               /* set if waiting for lock on vnode */
+#define AFS_VNODE_READLOCKED    7               /* set if vnode is read-locked on the server */
+#define AFS_VNODE_WRITELOCKED   8               /* set if vnode is write-locked on the server */
+#define AFS_VNODE_UNLOCKING     9               /* set if vnode is being unlocked on the server */
 
         long                    acl_order;      /* ACL check count (callback break count) */
 
         struct list_head        writebacks;     /* alterations in pagecache that need writing */
+        struct list_head        pending_locks;  /* locks waiting to be granted */
+        struct list_head        granted_locks;  /* locks granted on this file */
+        struct delayed_work     lock_work;      /* work to be done in locking */
+        struct key              *unlock_key;    /* key to be used in unlocking */
 
         /* outstanding callback notification on this file */
         struct rb_node          server_rb;      /* link in server->fs_vnodes */
@@ -474,6 +482,15 @@ extern int afs_open(struct inode *, struct file *);
 extern int afs_release(struct inode *, struct file *);
 
 /*
+ * flock.c
+ */
+extern void __exit afs_kill_lock_manager(void);
+extern void afs_lock_work(struct work_struct *);
+extern void afs_lock_may_be_available(struct afs_vnode *);
+extern int afs_lock(struct file *, int, struct file_lock *);
+extern int afs_flock(struct file *, int, struct file_lock *);
+
+/*
  * fsclient.c
  */
 extern int afs_fs_fetch_file_status(struct afs_server *, struct key *,
@@ -513,6 +530,15 @@ extern int afs_fs_get_volume_status(struct afs_server *, struct key *,
                                     struct afs_vnode *,
                                     struct afs_volume_status *,
                                     const struct afs_wait_mode *);
+extern int afs_fs_set_lock(struct afs_server *, struct key *,
+                           struct afs_vnode *, afs_lock_type_t,
+                           const struct afs_wait_mode *);
+extern int afs_fs_extend_lock(struct afs_server *, struct key *,
+                              struct afs_vnode *,
+                              const struct afs_wait_mode *);
+extern int afs_fs_release_lock(struct afs_server *, struct key *,
+                               struct afs_vnode *,
+                               const struct afs_wait_mode *);
 
 /*
  * inode.c
@@ -681,6 +707,10 @@ extern int afs_vnode_store_data(struct afs_writeback *, pgoff_t, pgoff_t,
 extern int afs_vnode_setattr(struct afs_vnode *, struct key *, struct iattr *);
 extern int afs_vnode_get_volume_status(struct afs_vnode *, struct key *,
                                        struct afs_volume_status *);
+extern int afs_vnode_set_lock(struct afs_vnode *, struct key *,
+                              afs_lock_type_t);
+extern int afs_vnode_extend_lock(struct afs_vnode *, struct key *);
+extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
 
 /*
  * volume.c