2 Unix SMB/Netbios implementation.
4 Files[] structure handling
5 Copyright (C) Andrew Tridgell 1998
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.
24 extern int DEBUGLEVEL;
26 static int real_max_open_files;
28 #define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
30 #define FILE_HANDLE_OFFSET 0x1000
32 static struct bitmap *file_bmap;
34 static files_struct *Files;
36 /* a fsp to use when chaining */
37 static files_struct *chain_fsp = NULL;
38 /* a fsp to use to save when breaking an oplock. */
39 static files_struct *oplock_save_chain_fsp = NULL;
41 static int files_used;
43 /****************************************************************************
44 find first available file slot
45 ****************************************************************************/
46 files_struct *file_new(void )
49 static int first_file;
50 files_struct *fsp, *next;
52 /* we want to give out file handles differently on each new
53 connection because of a common bug in MS clients where they try to
54 reuse a file descriptor from an earlier smb connection. This code
55 increases the chance that the errant client will get an error rather
56 than causing corruption */
57 if (first_file == 0) {
58 first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
61 i = bitmap_find(file_bmap, first_file);
64 * Before we give up, go through the open files
65 * and see if there are any files opened with a
66 * batch oplock. If so break the oplock and then
67 * re-use that entry (if it becomes closed).
68 * This may help as NT/95 clients tend to keep
69 * files batch oplocked for quite a long time
70 * after they have finished with them.
72 for (fsp=Files;fsp;fsp=next) {
74 if (attempt_close_oplocked_file(fsp)) {
79 DEBUG(0,("ERROR! Out of file structures\n"));
80 unix_ERR_class = ERRSRV;
81 unix_ERR_code = ERRnofids;
85 fsp = (files_struct *)malloc(sizeof(*fsp));
87 unix_ERR_class = ERRSRV;
88 unix_ERR_code = ERRnofids;
95 first_file = (i+1) % real_max_open_files;
97 bitmap_set(file_bmap, i);
100 fsp->fnum = i + FILE_HANDLE_OFFSET;
101 string_set(&fsp->fsp_name,"");
103 DLIST_ADD(Files, fsp);
105 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
106 i, fsp->fnum, files_used));
114 /****************************************************************************
115 close all open files for a connection
116 ****************************************************************************/
117 void file_close_conn(connection_struct *conn)
119 files_struct *fsp, *next;
121 for (fsp=Files;fsp;fsp=next) {
123 if (fsp->conn == conn) {
124 close_file(fsp,False);
129 /****************************************************************************
130 initialise file structures
131 ****************************************************************************/
133 #define MAX_OPEN_FUDGEFACTOR 10
137 int request_max_open_files = lp_max_open_files();
141 * Set the max_open files to be the requested
142 * max plus a fudgefactor to allow for the extra
143 * fd's we need such as log files etc...
145 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
147 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
149 if(real_max_open_files != request_max_open_files) {
150 DEBUG(1,("file_init: Information only: requested %d \
151 open files, %d are available.\n", request_max_open_files, real_max_open_files));
154 file_bmap = bitmap_allocate(real_max_open_files);
157 exit_server("out of memory in file_init");
161 * Ensure that pipe_handle_oppset is set correctly.
163 set_pipe_handle_offset(real_max_open_files);
167 /****************************************************************************
168 close files open by a specified vuid
169 ****************************************************************************/
170 void file_close_user(int vuid)
172 files_struct *fsp, *next;
174 for (fsp=Files;fsp;fsp=next) {
176 if (fsp->vuid == vuid) {
177 close_file(fsp,False);
183 /****************************************************************************
184 Find a fsp given a device, inode and timevalue
185 If this is from a kernel oplock break request then tval may be NULL.
186 ****************************************************************************/
188 files_struct *file_find_dit(SMB_DEV_T dev, SMB_INO_T inode, struct timeval *tval)
193 for (fsp=Files;fsp;fsp=fsp->next,count++) {
196 fsp->inode == inode &&
197 (tval ? (fsp->open_time.tv_sec == tval->tv_sec) : True ) &&
198 (tval ? (fsp->open_time.tv_usec == tval->tv_usec) : True )) {
200 DLIST_PROMOTE(Files, fsp);
209 /****************************************************************************
210 Check if an fsp still exists.
211 ****************************************************************************/
213 files_struct *file_find_fsp(files_struct *orig_fsp)
217 for (fsp=Files;fsp;fsp=fsp->next) {
225 /****************************************************************************
226 Find the first fsp given a device and inode.
227 ****************************************************************************/
229 files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
233 for (fsp=Files;fsp;fsp=fsp->next) {
234 if ( fsp->fd != -1 &&
236 fsp->inode == inode )
243 /****************************************************************************
244 Find the next fsp having the same device and inode.
245 ****************************************************************************/
247 files_struct *file_find_di_next(files_struct *start_fsp)
251 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
252 if ( fsp->fd != -1 &&
253 fsp->dev == start_fsp->dev &&
254 fsp->inode == start_fsp->inode )
261 /****************************************************************************
262 find a fsp that is open for printing
263 ****************************************************************************/
264 files_struct *file_find_print(void)
268 for (fsp=Files;fsp;fsp=fsp->next) {
269 if (fsp->print_file) return fsp;
276 /****************************************************************************
277 sync open files on a connection
278 ****************************************************************************/
279 void file_sync_all(connection_struct *conn)
281 files_struct *fsp, *next;
283 for (fsp=Files;fsp;fsp=next) {
285 if ((conn == fsp->conn) && (fsp->fd != -1)) {
286 conn->vfs_ops.fsync(fsp->fd);
292 /****************************************************************************
294 ****************************************************************************/
295 void file_free(files_struct *fsp)
297 DLIST_REMOVE(Files, fsp);
299 string_free(&fsp->fsp_name);
301 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
304 DEBUG(5,("freed files structure %d (%d used)\n",
305 fsp->fnum, files_used));
307 /* this is paranoia, just in case someone tries to reuse the
311 if (fsp == chain_fsp) chain_fsp = NULL;
317 /****************************************************************************
318 get a fsp from a packet given the offset of a 16 bit fnum
319 ****************************************************************************/
320 files_struct *file_fsp(char *buf, int where)
325 if (chain_fsp) return chain_fsp;
327 fnum = SVAL(buf, where);
329 for (fsp=Files;fsp;fsp=fsp->next, count++) {
330 if (fsp->fnum == fnum) {
333 DLIST_PROMOTE(Files, fsp);
341 /****************************************************************************
342 Reset the chained fsp - done at the start of a packet reply
343 ****************************************************************************/
345 void file_chain_reset(void)
350 /****************************************************************************
351 Save the chained fsp - done when about to do an oplock break.
352 ****************************************************************************/
354 void file_chain_save(void)
356 oplock_save_chain_fsp = chain_fsp;
359 /****************************************************************************
360 Restore the chained fsp - done after an oplock break.
361 ****************************************************************************/
362 void file_chain_restore(void)
364 chain_fsp = oplock_save_chain_fsp;