ntvfs/sysdep: add sys_lease abstraction to later support kernel oplocks
authorStefan Metzmacher <metze@samba.org>
Fri, 7 Mar 2008 11:19:06 +0000 (12:19 +0100)
committerStefan Metzmacher <metze@samba.org>
Wed, 12 Mar 2008 16:35:05 +0000 (17:35 +0100)
metze

source/ntvfs/sysdep/config.mk
source/ntvfs/sysdep/sys_lease.c [new file with mode: 0644]
source/ntvfs/sysdep/sys_lease.h [new file with mode: 0644]

index dee198c9dab9b9a7977bb19c7e193762136ebc9c..753c8833a4d3a64f425d4abaa73d88e795922639 100644 (file)
@@ -16,3 +16,11 @@ OBJ_FILES = \
 PUBLIC_DEPENDENCIES = 
 # End SUBSYSTEM sys_notify
 ################################################
+
+################################################
+# Start SUBSYSTEM sys_lease
+[SUBSYSTEM::sys_lease]
+OBJ_FILES = \
+               sys_lease.o
+# End SUBSYSTEM sys_lease
+################################################
diff --git a/source/ntvfs/sysdep/sys_lease.c b/source/ntvfs/sysdep/sys_lease.c
new file mode 100644 (file)
index 0000000..28dd27a
--- /dev/null
@@ -0,0 +1,142 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Stefan Metzmacher 2008
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+  abstract the various kernel interfaces to leases (oplocks) into a
+  single Samba friendly interface
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "ntvfs/sysdep/sys_lease.h"
+#include "lib/events/events.h"
+#include "lib/util/dlinklist.h"
+#include "param/param.h"
+#include "build.h"
+
+/* list of registered backends */
+static struct sys_lease_ops *backends;
+static uint32_t num_backends;
+
+#define LEASE_BACKEND  "lease:backend"
+
+/*
+  initialise a system change notify backend
+*/
+_PUBLIC_ struct sys_lease_context *sys_lease_context_create(struct share_config *scfg,
+                                                           TALLOC_CTX *mem_ctx,
+                                                           struct event_context *ev,
+                                                           struct messaging_context *msg,
+                                                           sys_lease_send_break_fn break_send)
+{
+       struct sys_lease_context *ctx;
+       const char *bname;
+       int i;
+       NTSTATUS status;
+
+       if (num_backends == 0) {
+               return NULL;
+       }
+
+       if (ev == NULL) {
+               ev = event_context_find(mem_ctx);
+       }
+
+       ctx = talloc_zero(mem_ctx, struct sys_lease_context);
+       if (ctx == NULL) {
+               return NULL;
+       }
+
+       ctx->event_ctx = ev;
+       ctx->msg_ctx = msg;
+       ctx->break_send = break_send;
+
+       bname = share_string_option(scfg, LEASE_BACKEND, NULL);
+       if (!bname) {
+               talloc_free(ctx);
+               return NULL;
+       }
+
+       for (i=0;i<num_backends;i++) {
+               if (strcasecmp(backends[i].name, bname) == 0) {
+                       ctx->ops = &backends[i];
+                       break;
+               }
+       }
+
+       if (!ctx->ops) {
+               talloc_free(ctx);
+               return NULL;
+       }
+
+       status = ctx->ops->init(ctx);
+       if (!NT_STATUS_IS_OK(status)) {
+               talloc_free(ctx);
+               return NULL;
+       }
+
+       return ctx;
+}
+
+/*
+  register a lease backend
+*/
+_PUBLIC_ NTSTATUS sys_lease_register(const struct sys_lease_ops *backend)
+{
+       struct sys_lease_ops *b;
+       b = talloc_realloc(talloc_autofree_context(), backends,
+                          struct sys_lease_ops, num_backends+1);
+       NT_STATUS_HAVE_NO_MEMORY(b);
+       backends = b;
+       backends[num_backends] = *backend;
+       num_backends++;
+       return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS sys_lease_init(void)
+{
+       static bool initialized = false;
+
+       init_module_fn static_init[] = { STATIC_sys_lease_MODULES };
+
+       if (initialized) return NT_STATUS_OK;
+       initialized = true;
+
+       run_init_functions(static_init);
+
+       return NT_STATUS_OK;
+}
+
+NTSTATUS sys_lease_setup(struct sys_lease_context *ctx,
+                        struct opendb_entry *e)
+{
+       return ctx->ops->setup(ctx, e);
+}
+
+NTSTATUS sys_lease_update(struct sys_lease_context *ctx,
+                         struct opendb_entry *e)
+{
+       return ctx->ops->update(ctx, e);
+}
+
+NTSTATUS sys_lease_remove(struct sys_lease_context *ctx,
+                         struct opendb_entry *e)
+{
+       return ctx->ops->remove(ctx, e);
+}
diff --git a/source/ntvfs/sysdep/sys_lease.h b/source/ntvfs/sysdep/sys_lease.h
new file mode 100644 (file)
index 0000000..e53760f
--- /dev/null
@@ -0,0 +1,65 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Stefan Metzmacher 2008
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "param/share.h"
+
+struct sys_lease_context;
+struct opendb_entry;
+struct messaging_context;
+
+typedef NTSTATUS (*sys_lease_send_break_fn)(struct messaging_context *,
+                                           struct opendb_entry *,
+                                           uint8_t level);
+
+struct sys_lease_ops {
+       const char *name;
+       NTSTATUS (*init)(struct sys_lease_context *ctx);
+       NTSTATUS (*setup)(struct sys_lease_context *ctx,
+                         struct opendb_entry *e);
+       NTSTATUS (*update)(struct sys_lease_context *ctx,
+                          struct opendb_entry *e);
+       NTSTATUS (*remove)(struct sys_lease_context *ctx,
+                          struct opendb_entry *e);
+};
+
+struct sys_lease_context {
+       struct event_context *event_ctx;
+       struct messaging_context *msg_ctx;
+       sys_lease_send_break_fn break_send;
+       void *private_data; /* for use of backend */
+       const struct sys_lease_ops *ops;
+};
+
+NTSTATUS sys_lease_register(const struct sys_lease_ops *ops);
+NTSTATUS sys_lease_init(void);
+
+struct sys_lease_context *sys_lease_context_create(struct share_config *scfg,
+                                                  TALLOC_CTX *mem_ctx,
+                                                  struct event_context *ev,
+                                                  struct messaging_context *msg_ctx,
+                                                  sys_lease_send_break_fn break_send);
+
+NTSTATUS sys_lease_setup(struct sys_lease_context *ctx,
+                        struct opendb_entry *e);
+
+NTSTATUS sys_lease_update(struct sys_lease_context *ctx,
+                         struct opendb_entry *e);
+
+NTSTATUS sys_lease_remove(struct sys_lease_context *ctx,
+                         struct opendb_entry *e);