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Unix SMB/CIFS implementation.
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generic byte range locking code
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Copyright (C) Andrew Tridgell 1992-2004
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Copyright (C) Jeremy Allison 1992-2000
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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/* This module implements a tdb based byte range locking service,
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replacing the fcntl() based byte range locking previously
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used. This allows us to provide the same semantics as NT */
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#include "system/filesys.h"
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#include "../tdb/include/tdb.h"
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#include "messaging/messaging.h"
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#include "lib/messaging/irpc.h"
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#include "libcli/libcli.h"
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#include "cluster/cluster.h"
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#include "ntvfs/common/ntvfs_common.h"
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static const struct brlock_ops *ops;
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set the brl backend ops
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void brl_set_ops(const struct brlock_ops *new_ops)
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Open up the brlock database. Close it down using talloc_free(). We
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need the messaging_ctx to allow for pending lock notifications.
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struct brl_context *brl_init(TALLOC_CTX *mem_ctx, struct server_id server,
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struct loadparm_context *lp_ctx,
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struct messaging_context *messaging_ctx)
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return ops->brl_init(mem_ctx, server, lp_ctx, messaging_ctx);
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struct brl_handle *brl_create_handle(TALLOC_CTX *mem_ctx, struct ntvfs_handle *ntvfs, DATA_BLOB *file_key)
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return ops->brl_create_handle(mem_ctx, ntvfs, file_key);
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Lock a range of bytes. The lock_type can be a PENDING_*_LOCK, in
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which case a real lock is first tried, and if that fails then a
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pending lock is created. When the pending lock is triggered (by
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someone else closing an overlapping lock range) a messaging
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notification is sent, identified by the notify_ptr
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NTSTATUS brl_lock(struct brl_context *brl,
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struct brl_handle *brlh,
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uint64_t start, uint64_t size,
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enum brl_type lock_type,
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return ops->brl_lock(brl, brlh, smbpid, start, size, lock_type, notify_ptr);
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Unlock a range of bytes.
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NTSTATUS brl_unlock(struct brl_context *brl,
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struct brl_handle *brlh,
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uint64_t start, uint64_t size)
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return ops->brl_unlock(brl, brlh, smbpid, start, size);
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remove a pending lock. This is called when the caller has either
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given up trying to establish a lock or when they have succeeded in
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getting it. In either case they no longer need to be notified.
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NTSTATUS brl_remove_pending(struct brl_context *brl,
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struct brl_handle *brlh,
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return ops->brl_remove_pending(brl, brlh, notify_ptr);
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Test if we are allowed to perform IO on a region of an open file
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NTSTATUS brl_locktest(struct brl_context *brl,
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struct brl_handle *brlh,
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uint64_t start, uint64_t size,
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enum brl_type lock_type)
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return ops->brl_locktest(brl, brlh, smbpid, start, size, lock_type);
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Remove any locks associated with a open file.
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NTSTATUS brl_close(struct brl_context *brl,
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struct brl_handle *brlh)
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return ops->brl_close(brl, brlh);