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/*
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 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/>.
*/
/* 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 <tdb.h>
#include "messaging/messaging.h"
#include "lib/messaging/irpc.h"
#include "libcli/libcli.h"
#include "cluster/cluster.h"
#include "ntvfs/common/ntvfs_common.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 loadparm_context *lp_ctx,
struct messaging_context *messaging_ctx)
{
if (ops == NULL) {
brl_tdb_init_ops();
}
return ops->brl_init(mem_ctx, server, lp_ctx, 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,
uint32_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,
uint32_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,
uint32_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);
}
/*
Get a number of locks associated with a open file.
*/
NTSTATUS brl_count(struct brl_context *brl,
struct brl_handle *brlh,
int *count)
{
return ops->brl_count(brl, brlh, count);
}
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