| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | SMB parameters and setup, plus a whole lot more.
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| 4 |
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| 5 | Copyright (C) Jeremy Allison 2006
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software
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| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 | */
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| 21 |
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| 22 | #ifndef _LOCKING_H
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| 23 | #define _LOCKING_H
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| 24 |
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| 25 | /* passed to br lock code - the UNLOCK_LOCK should never be stored into the tdb
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| 26 | and is used in calculating POSIX unlock ranges only. We differentiate between
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| 27 | PENDING read and write locks to allow posix lock downgrades to trigger a lock
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| 28 | re-evaluation. */
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| 29 |
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| 30 | enum brl_type {READ_LOCK, WRITE_LOCK, PENDING_READ_LOCK, PENDING_WRITE_LOCK, UNLOCK_LOCK};
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| 31 | enum brl_flavour {WINDOWS_LOCK = 0, POSIX_LOCK = 1};
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| 32 |
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| 33 | #define IS_PENDING_LOCK(type) ((type) == PENDING_READ_LOCK || (type) == PENDING_WRITE_LOCK)
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| 34 |
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| 35 | /* This contains elements that differentiate locks. The smbpid is a
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| 36 | client supplied pid, and is essentially the locking context for
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| 37 | this client */
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| 38 |
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| 39 | struct lock_context {
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| 40 | uint32 smbpid;
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| 41 | uint16 tid;
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| 42 | struct process_id pid;
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| 43 | };
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| 44 |
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| 45 | /* The key used in the brlock database. */
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| 46 |
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| 47 | struct lock_key {
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| 48 | SMB_DEV_T device;
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| 49 | SMB_INO_T inode;
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| 50 | };
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| 51 |
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| 52 | struct files_struct;
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| 53 |
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| 54 | struct byte_range_lock {
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| 55 | struct files_struct *fsp;
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| 56 | unsigned int num_locks;
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| 57 | BOOL modified;
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| 58 | BOOL read_only;
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| 59 | struct lock_key key;
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| 60 | void *lock_data;
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| 61 | };
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| 62 |
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| 63 | #define BRLOCK_FN_CAST() \
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| 64 | void (*)(SMB_DEV_T dev, SMB_INO_T ino, struct process_id pid, \
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| 65 | enum brl_type lock_type, \
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| 66 | enum brl_flavour lock_flav, \
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| 67 | br_off start, br_off size)
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| 68 |
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| 69 | #define BRLOCK_FN(fn) \
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| 70 | void (*fn)(SMB_DEV_T dev, SMB_INO_T ino, struct process_id pid, \
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| 71 | enum brl_type lock_type, \
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| 72 | enum brl_flavour lock_flav, \
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| 73 | br_off start, br_off size)
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| 74 |
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| 75 | /* Internal structure in brlock.tdb.
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| 76 | The data in brlock records is an unsorted linear array of these
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| 77 | records. It is unnecessary to store the count as tdb provides the
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| 78 | size of the record */
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| 79 |
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| 80 | struct lock_struct {
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| 81 | struct lock_context context;
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| 82 | br_off start;
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| 83 | br_off size;
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| 84 | uint16 fnum;
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| 85 | enum brl_type lock_type;
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| 86 | enum brl_flavour lock_flav;
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| 87 | };
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| 88 |
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| 89 | #endif /* _LOCKING_H_ */
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