summaryrefslogtreecommitdiff
path: root/source4/ntvfs
diff options
context:
space:
mode:
Diffstat (limited to 'source4/ntvfs')
-rw-r--r--source4/ntvfs/common/brlock.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/source4/ntvfs/common/brlock.c b/source4/ntvfs/common/brlock.c
new file mode 100644
index 0000000000..e483a6ba9b
--- /dev/null
+++ b/source4/ntvfs/common/brlock.c
@@ -0,0 +1,132 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ generic byte range locking code
+
+ Copyright (C) Andrew Tridgell 1992-2004
+ Copyright (C) Jeremy Allison 1992-2000
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* This module implements a tdb based byte range locking service,
+ replacing the fcntl() based byte range locking previously
+ used. This allows us to provide the same semantics as NT */
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "lib/tdb/include/tdb.h"
+#include "messaging/messaging.h"
+#include "db_wrap.h"
+#include "lib/messaging/irpc.h"
+#include "libcli/libcli.h"
+#include "cluster/cluster.h"
+#include "ntvfs/common/brlock.h"
+
+static const struct brlock_ops *ops;
+
+/*
+ set the brl backend ops
+*/
+void brl_set_ops(const struct brlock_ops *new_ops)
+{
+ ops = new_ops;
+}
+
+/*
+ Open up the brlock database. Close it down using talloc_free(). We
+ need the messaging_ctx to allow for pending lock notifications.
+*/
+struct brl_context *brl_init(TALLOC_CTX *mem_ctx, struct server_id server,
+ struct messaging_context *messaging_ctx)
+{
+ if (ops == NULL) {
+ if (lp_parm_bool(-1, "ctdb", "brlock", False)) {
+ brl_ctdb_init_ops();
+ } else {
+ brl_tdb_init_ops();
+ }
+ }
+ return ops->brl_init(mem_ctx, server, messaging_ctx);
+}
+
+struct brl_handle *brl_create_handle(TALLOC_CTX *mem_ctx, struct ntvfs_handle *ntvfs, DATA_BLOB *file_key)
+{
+ return ops->brl_create_handle(mem_ctx, ntvfs, file_key);
+}
+
+/*
+ Lock a range of bytes. The lock_type can be a PENDING_*_LOCK, in
+ which case a real lock is first tried, and if that fails then a
+ pending lock is created. When the pending lock is triggered (by
+ someone else closing an overlapping lock range) a messaging
+ notification is sent, identified by the notify_ptr
+*/
+NTSTATUS brl_lock(struct brl_context *brl,
+ struct brl_handle *brlh,
+ uint16_t smbpid,
+ uint64_t start, uint64_t size,
+ enum brl_type lock_type,
+ void *notify_ptr)
+{
+ return ops->brl_lock(brl, brlh, smbpid, start, size, lock_type, notify_ptr);
+}
+
+
+/*
+ Unlock a range of bytes.
+*/
+NTSTATUS brl_unlock(struct brl_context *brl,
+ struct brl_handle *brlh,
+ uint16_t smbpid,
+ uint64_t start, uint64_t size)
+{
+ return ops->brl_unlock(brl, brlh, smbpid, start, size);
+}
+
+/*
+ remove a pending lock. This is called when the caller has either
+ given up trying to establish a lock or when they have succeeded in
+ getting it. In either case they no longer need to be notified.
+*/
+NTSTATUS brl_remove_pending(struct brl_context *brl,
+ struct brl_handle *brlh,
+ void *notify_ptr)
+{
+ return ops->brl_remove_pending(brl, brlh, notify_ptr);
+}
+
+
+/*
+ Test if we are allowed to perform IO on a region of an open file
+*/
+NTSTATUS brl_locktest(struct brl_context *brl,
+ struct brl_handle *brlh,
+ uint16_t smbpid,
+ uint64_t start, uint64_t size,
+ enum brl_type lock_type)
+{
+ return ops->brl_locktest(brl, brlh, smbpid, start, size, lock_type);
+}
+
+
+/*
+ Remove any locks associated with a open file.
+*/
+NTSTATUS brl_close(struct brl_context *brl,
+ struct brl_handle *brlh)
+{
+ return ops->brl_close(brl, brlh);
+}