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 = (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"));
83 fsp = (files_struct *)malloc(sizeof(*fsp));
84 if (!fsp) return NULL;
89 first_file = (i+1) % real_max_open_files;
91 bitmap_set(file_bmap, i);
94 fsp->fnum = i + FILE_HANDLE_OFFSET;
95 string_set(&fsp->fsp_name,"");
97 DLIST_ADD(Files, fsp);
99 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
100 i, fsp->fnum, files_used));
108 /****************************************************************************
109 close all open files for a connection
110 ****************************************************************************/
111 void file_close_conn(connection_struct *conn)
113 files_struct *fsp, *next;
115 for (fsp=Files;fsp;fsp=next) {
117 if (fsp->conn == conn && fsp->open) {
118 close_file(fsp,False);
123 /****************************************************************************
124 initialise file structures
125 ****************************************************************************/
127 #define MAX_OPEN_FUDGEFACTOR 10
131 int request_max_open_files = lp_max_open_files();
135 * Set the max_open files to be the requested
136 * max plus a fudgefactor to allow for the extra
137 * fd's we need such as log files etc...
139 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
141 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
143 if(real_max_open_files != request_max_open_files) {
144 DEBUG(1,("file_init: Information only: requested %d \
145 open files, %d are available.\n", request_max_open_files, real_max_open_files));
148 file_bmap = bitmap_allocate(real_max_open_files);
151 exit_server("out of memory in file_init");
155 * Ensure that pipe_handle_oppset is set correctly.
157 set_pipe_handle_offset(real_max_open_files);
161 /****************************************************************************
162 close files open by a specified vuid
163 ****************************************************************************/
164 void file_close_user(int vuid)
166 files_struct *fsp, *next;
168 for (fsp=Files;fsp;fsp=next) {
170 if ((fsp->vuid == vuid) && fsp->open) {
171 close_file(fsp,False);
177 /****************************************************************************
178 Find a fsp given a device, inode and timevalue
179 If this is from a kernel oplock break request then tval may be NULL.
180 ****************************************************************************/
182 files_struct *file_find_dit(SMB_DEV_T dev, SMB_INO_T inode, struct timeval *tval)
187 for (fsp=Files;fsp;fsp=fsp->next,count++) {
191 fsp->inode == inode &&
192 (tval ? (fsp->open_time.tv_sec == tval->tv_sec) : True ) &&
193 (tval ? (fsp->open_time.tv_usec == tval->tv_usec) : True )) {
195 DLIST_PROMOTE(Files, fsp);
204 /****************************************************************************
205 Find the first fsp given a device and inode.
206 ****************************************************************************/
208 files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
212 for (fsp=Files;fsp;fsp=fsp->next) {
216 fsp->inode == inode )
223 /****************************************************************************
224 Find the next fsp having the same device and inode.
225 ****************************************************************************/
227 files_struct *file_find_di_next(files_struct *start_fsp)
231 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
234 fsp->dev == start_fsp->dev &&
235 fsp->inode == start_fsp->inode )
242 /****************************************************************************
243 find a fsp that is open for printing
244 ****************************************************************************/
245 files_struct *file_find_print(void)
249 for (fsp=Files;fsp;fsp=fsp->next) {
250 if (fsp->open && fsp->print_file) return fsp;
257 /****************************************************************************
258 sync open files on a connection
259 ****************************************************************************/
260 void file_sync_all(connection_struct *conn)
262 files_struct *fsp, *next;
264 for (fsp=Files;fsp;fsp=next) {
266 if (fsp->open && (conn == fsp->conn) && (fsp->fd != -1)) {
267 conn->vfs_ops.fsync(fsp->fd);
273 /****************************************************************************
275 ****************************************************************************/
276 void file_free(files_struct *fsp)
278 DLIST_REMOVE(Files, fsp);
280 string_free(&fsp->fsp_name);
282 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
285 DEBUG(5,("freed files structure %d (%d used)\n",
286 fsp->fnum, files_used));
288 /* this is paranoia, just in case someone tries to reuse the
292 if (fsp == chain_fsp) chain_fsp = NULL;
298 /****************************************************************************
299 get a fsp from a packet given the offset of a 16 bit fnum
300 ****************************************************************************/
301 files_struct *file_fsp(char *buf, int where)
306 if (chain_fsp) return chain_fsp;
308 fnum = SVAL(buf, where);
310 for (fsp=Files;fsp;fsp=fsp->next, count++) {
311 if (fsp->fnum == fnum) {
314 DLIST_PROMOTE(Files, fsp);
322 /****************************************************************************
323 Reset the chained fsp - done at the start of a packet reply
324 ****************************************************************************/
326 void file_chain_reset(void)
331 /****************************************************************************
332 Save the chained fsp - done when about to do an oplock break.
333 ****************************************************************************/
335 void file_chain_save(void)
337 oplock_save_chain_fsp = chain_fsp;
340 /****************************************************************************
341 Restore the chained fsp - done after an oplock break.
342 ****************************************************************************/
343 void file_chain_restore(void)
345 chain_fsp = oplock_save_chain_fsp;