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90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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SMB parameters and setup, plus a whole lot more.
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Copyright (C) Jeremy Allison 2006
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _LOCKING_H
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#define _LOCKING_H
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/* passed to br lock code - the UNLOCK_LOCK should never be stored into the tdb
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and is used in calculating POSIX unlock ranges only. We differentiate between
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PENDING read and write locks to allow posix lock downgrades to trigger a lock
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re-evaluation. */
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enum brl_type {READ_LOCK, WRITE_LOCK, PENDING_READ_LOCK, PENDING_WRITE_LOCK, UNLOCK_LOCK};
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enum brl_flavour {WINDOWS_LOCK = 0, POSIX_LOCK = 1};
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#define IS_PENDING_LOCK(type) ((type) == PENDING_READ_LOCK || (type) == PENDING_WRITE_LOCK)
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/* This contains elements that differentiate locks. The smbpid is a
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client supplied pid, and is essentially the locking context for
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this client */
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struct lock_context {
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uint32 smbpid;
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uint16 tid;
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struct process_id pid;
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};
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/* The key used in the brlock database. */
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struct lock_key {
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SMB_DEV_T device;
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SMB_INO_T inode;
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};
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struct files_struct;
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struct byte_range_lock {
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struct files_struct *fsp;
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unsigned int num_locks;
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BOOL modified;
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BOOL read_only;
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struct lock_key key;
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struct lock_struct *lock_data;
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};
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#define BRLOCK_FN_CAST() \
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void (*)(SMB_DEV_T dev, SMB_INO_T ino, struct process_id pid, \
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enum brl_type lock_type, \
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enum brl_flavour lock_flav, \
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br_off start, br_off size)
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#define BRLOCK_FN(fn) \
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void (*fn)(SMB_DEV_T dev, SMB_INO_T ino, struct process_id pid, \
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enum brl_type lock_type, \
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enum brl_flavour lock_flav, \
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br_off start, br_off size)
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/* Internal structure in brlock.tdb.
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The data in brlock records is an unsorted linear array of these
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records. It is unnecessary to store the count as tdb provides the
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size of the record */
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struct lock_struct {
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struct lock_context context;
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br_off start;
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br_off size;
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uint16 fnum;
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enum brl_type lock_type;
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enum brl_flavour lock_flav;
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};
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#endif /* _LOCKING_H_ */
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