diff options
| -rw-r--r-- | source4/ntvfs/common/brlock.c | 132 |
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); +} |