2 Unix SMB/Netbios implementation.
5 Copyright (C) Andrew Tridgell 1992-1997
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 12 aug 96: Erik.Devriendt@te6.siemens.be
24 added support for shared memory implementation of share mode locking
26 May 1997. Jeremy Allison (jallison@whistle.com). Modified share mode
27 locking to deal with multiple share modes per open file.
29 September 1997. Jeremy Allison (jallison@whistle.com). Added oplock
35 extern int DEBUGLEVEL;
36 extern connection_struct Connections[];
37 extern files_struct Files[];
39 static struct share_ops *share_ops;
41 /****************************************************************************
42 utility function called to see if a file region is locked
43 ****************************************************************************/
44 BOOL is_locked(int fnum,int cnum,uint32 count,uint32 offset)
46 int snum = SNUM(cnum);
51 if (!lp_locking(snum) || !lp_strict_locking(snum))
54 return(fcntl_lock(Files[fnum].fd_ptr->fd,F_GETLK,offset,count,
55 (Files[fnum].can_write?F_WRLCK:F_RDLCK)));
59 /****************************************************************************
60 utility function called by locking requests
61 ****************************************************************************/
62 BOOL do_lock(int fnum,int cnum,uint32 count,uint32 offset,int *eclass,uint32 *ecode)
66 if (!lp_locking(SNUM(cnum)))
75 if (Files[fnum].can_lock && OPEN_FNUM(fnum) && (Files[fnum].cnum == cnum))
76 ok = fcntl_lock(Files[fnum].fd_ptr->fd,F_SETLK,offset,count,
77 (Files[fnum].can_write?F_WRLCK:F_RDLCK));
84 return True; /* Got lock */
88 /****************************************************************************
89 utility function called by unlocking requests
90 ****************************************************************************/
91 BOOL do_unlock(int fnum,int cnum,uint32 count,uint32 offset,int *eclass,uint32 *ecode)
95 if (!lp_locking(SNUM(cnum)))
98 if (Files[fnum].can_lock && OPEN_FNUM(fnum) && (Files[fnum].cnum == cnum))
99 ok = fcntl_lock(Files[fnum].fd_ptr->fd,F_SETLK,offset,count,F_UNLCK);
106 return True; /* Did unlock */
111 /****************************************************************************
112 initialise the locking functions
113 ****************************************************************************/
114 BOOL locking_init(int read_only)
116 if (share_ops) return True;
118 #ifdef FAST_SHARE_MODES
119 share_ops = locking_shm_init(read_only);
121 DEBUG(0,("ERROR: Failed to initialise fast share modes - trying slow code\n"));
123 if (share_ops) return True;
126 share_ops = locking_slow_init(read_only);
128 DEBUG(0,("ERROR: Failed to initialise share modes!\n"));
135 /*******************************************************************
136 deinitialize the share_mode management
137 ******************************************************************/
138 BOOL locking_end(void)
141 return share_ops->stop_mgmt();
146 /*******************************************************************
147 lock a hash bucket entry
148 ******************************************************************/
149 BOOL lock_share_entry(int cnum, uint32 dev, uint32 inode, int *ptok)
151 return share_ops->lock_entry(cnum, dev, inode, ptok);
154 /*******************************************************************
155 unlock a hash bucket entry
156 ******************************************************************/
157 BOOL unlock_share_entry(int cnum, uint32 dev, uint32 inode, int token)
159 return share_ops->unlock_entry(cnum, dev, inode, token);
162 /*******************************************************************
163 get all share mode entries for a dev/inode pair.
164 ********************************************************************/
165 int get_share_modes(int cnum, int token, uint32 dev, uint32 inode,
166 share_mode_entry **shares)
168 return share_ops->get_entries(cnum, token, dev, inode, shares);
171 /*******************************************************************
172 del the share mode of a file.
173 ********************************************************************/
174 void del_share_mode(int token, int fnum)
176 share_ops->del_entry(token, fnum);
179 /*******************************************************************
180 set the share mode of a file. Return False on fail, True on success.
181 ********************************************************************/
182 BOOL set_share_mode(int token, int fnum, uint16 port, uint16 op_type)
184 return share_ops->set_entry(token, fnum, port, op_type);
187 /*******************************************************************
188 Remove an oplock port and mode entry from a share mode.
189 ********************************************************************/
190 BOOL remove_share_oplock(int fnum, int token)
192 return share_ops->remove_oplock(fnum, token);
196 /*******************************************************************
197 call the specified function on each entry under management by the
199 ********************************************************************/
200 int share_mode_forall(void (*fn)(share_mode_entry *, char *))
202 return share_ops->forall(fn);
205 /*******************************************************************
206 dump the state of the system
207 ********************************************************************/
208 void share_status(FILE *f)
210 share_ops->status(f);