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>
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 2c55dd9..6306438 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -351,10 +351,18 @@
#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_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 @@
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_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