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/*
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"
/* 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) {
return NULL;
}
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;
}
#ifndef STATIC_sys_lease_MODULES
#define STATIC_sys_lease_MODULES NULL
#endif
_PUBLIC_ NTSTATUS sys_lease_init(void)
{
static bool initialized = false;
extern NTSTATUS sys_lease_linux_init(void);
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);
}
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