2 Unix SMB/CIFS implementation.
3 Files[] structure handling
4 Copyright (C) Andrew Tridgell 1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 static int real_max_open_files;
25 #define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
27 #define FILE_HANDLE_OFFSET 0x1000
29 static struct bitmap *file_bmap;
31 static files_struct *Files;
33 /* a fsp to use when chaining */
34 static files_struct *chain_fsp = NULL;
35 /* a fsp to use to save when breaking an oplock. */
36 static files_struct *oplock_save_chain_fsp = NULL;
38 static int files_used;
40 /* A singleton cache to speed up searching by dev/inode. */
41 static struct fsp_singleton_cache {
47 /****************************************************************************
48 Return a unique number identifying this fsp over the life of this pid.
49 ****************************************************************************/
51 static unsigned long get_gen_count(void)
53 static unsigned long file_gen_counter;
55 if ((++file_gen_counter) == 0)
56 return ++file_gen_counter;
57 return file_gen_counter;
60 /****************************************************************************
61 Find first available file slot.
62 ****************************************************************************/
64 files_struct *file_new(connection_struct *conn)
67 static int first_file;
68 files_struct *fsp, *next;
70 /* we want to give out file handles differently on each new
71 connection because of a common bug in MS clients where they try to
72 reuse a file descriptor from an earlier smb connection. This code
73 increases the chance that the errant client will get an error rather
74 than causing corruption */
75 if (first_file == 0) {
76 first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
79 i = bitmap_find(file_bmap, first_file);
82 * Before we give up, go through the open files
83 * and see if there are any files opened with a
84 * batch oplock. If so break the oplock and then
85 * re-use that entry (if it becomes closed).
86 * This may help as NT/95 clients tend to keep
87 * files batch oplocked for quite a long time
88 * after they have finished with them.
90 for (fsp=Files;fsp;fsp=next) {
92 if (attempt_close_oplocked_file(fsp)) {
93 return file_new(conn);
97 DEBUG(0,("ERROR! Out of file structures\n"));
98 unix_ERR_class = ERRSRV;
99 unix_ERR_code = ERRnofids;
103 fsp = SMB_MALLOC_P(files_struct);
105 unix_ERR_class = ERRSRV;
106 unix_ERR_code = ERRnofids;
113 fsp->file_id = get_gen_count();
114 GetTimeOfDay(&fsp->open_time);
116 first_file = (i+1) % real_max_open_files;
118 bitmap_set(file_bmap, i);
121 fsp->fnum = i + FILE_HANDLE_OFFSET;
122 SMB_ASSERT(fsp->fnum < 65536);
124 string_set(&fsp->fsp_name,"");
126 DLIST_ADD(Files, fsp);
128 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
129 i, fsp->fnum, files_used));
133 /* A new fsp invalidates a negative fsp_fi_cache. */
134 if (fsp_fi_cache.fsp == NULL) {
135 ZERO_STRUCT(fsp_fi_cache);
141 /****************************************************************************
142 Close all open files for a connection.
143 ****************************************************************************/
145 void file_close_conn(connection_struct *conn)
147 files_struct *fsp, *next;
149 for (fsp=Files;fsp;fsp=next) {
151 if (fsp->conn == conn) {
152 close_file(fsp,False);
157 /****************************************************************************
158 Close all open files for a pid.
159 ****************************************************************************/
161 void file_close_pid(uint16 smbpid)
163 files_struct *fsp, *next;
165 for (fsp=Files;fsp;fsp=next) {
167 if (fsp->file_pid == smbpid) {
168 close_file(fsp,False);
173 /****************************************************************************
174 Initialise file structures.
175 ****************************************************************************/
177 #define MAX_OPEN_FUDGEFACTOR 20
181 int request_max_open_files = lp_max_open_files();
185 * Set the max_open files to be the requested
186 * max plus a fudgefactor to allow for the extra
187 * fd's we need such as log files etc...
189 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
191 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
193 if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
194 real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
196 if(real_max_open_files != request_max_open_files) {
197 DEBUG(1,("file_init: Information only: requested %d \
198 open files, %d are available.\n", request_max_open_files, real_max_open_files));
201 SMB_ASSERT(real_max_open_files > 100);
203 file_bmap = bitmap_allocate(real_max_open_files);
206 exit_server("out of memory in file_init");
210 * Ensure that pipe_handle_oppset is set correctly.
212 set_pipe_handle_offset(real_max_open_files);
215 /****************************************************************************
216 Close files open by a specified vuid.
217 ****************************************************************************/
219 void file_close_user(int vuid)
221 files_struct *fsp, *next;
223 for (fsp=Files;fsp;fsp=next) {
225 if (fsp->vuid == vuid) {
226 close_file(fsp,False);
231 void file_dump_open_table(void)
236 for (fsp=Files;fsp;fsp=fsp->next,count++) {
237 DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, fileid = %lu, dev = %x, inode = %.0f\n",
238 count, fsp->fnum, fsp->fsp_name, fsp->fd, (unsigned long)fsp->file_id,
239 (unsigned int)fsp->dev, (double)fsp->inode ));
243 /****************************************************************************
244 Find a fsp given a file descriptor.
245 ****************************************************************************/
247 files_struct *file_find_fd(int fd)
252 for (fsp=Files;fsp;fsp=fsp->next,count++) {
255 DLIST_PROMOTE(Files, fsp);
264 /****************************************************************************
265 Find a fsp given a device, inode and file_id.
266 ****************************************************************************/
268 files_struct *file_find_dif(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
273 for (fsp=Files;fsp;fsp=fsp->next,count++) {
274 /* We can have a fsp->fd == -1 here as it could be a stat open. */
275 if (fsp->dev == dev &&
276 fsp->inode == inode &&
277 fsp->file_id == file_id ) {
279 DLIST_PROMOTE(Files, fsp);
281 /* Paranoia check. */
282 if (fsp->fd == -1 && fsp->oplock_type != NO_OPLOCK) {
283 DEBUG(0,("file_find_dif: file %s dev = %x, inode = %.0f, file_id = %u \
284 oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name, (unsigned int)fsp->dev,
285 (double)fsp->inode, (unsigned int)fsp->file_id,
286 (unsigned int)fsp->oplock_type ));
287 smb_panic("file_find_dif\n");
296 /****************************************************************************
297 Check if an fsp still exists.
298 ****************************************************************************/
300 files_struct *file_find_fsp(files_struct *orig_fsp)
304 for (fsp=Files;fsp;fsp=fsp->next) {
312 /****************************************************************************
313 Find the first fsp given a device and inode.
314 We use a singleton cache here to speed up searching from getfilepathinfo
316 ****************************************************************************/
318 files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
322 if (fsp_fi_cache.dev == dev && fsp_fi_cache.inode == inode) {
323 /* Positive or negative cache hit. */
324 return fsp_fi_cache.fsp;
327 fsp_fi_cache.dev = dev;
328 fsp_fi_cache.inode = inode;
330 for (fsp=Files;fsp;fsp=fsp->next) {
331 if ( fsp->fd != -1 &&
333 fsp->inode == inode ) {
334 /* Setup positive cache. */
335 fsp_fi_cache.fsp = fsp;
340 /* Setup negative cache. */
341 fsp_fi_cache.fsp = NULL;
345 /****************************************************************************
346 Find the next fsp having the same device and inode.
347 ****************************************************************************/
349 files_struct *file_find_di_next(files_struct *start_fsp)
353 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
354 if ( fsp->fd != -1 &&
355 fsp->dev == start_fsp->dev &&
356 fsp->inode == start_fsp->inode )
363 /****************************************************************************
364 Find a fsp that is open for printing.
365 ****************************************************************************/
367 files_struct *file_find_print(void)
371 for (fsp=Files;fsp;fsp=fsp->next) {
372 if (fsp->print_file) {
380 /****************************************************************************
381 Set a pending modtime across all files with a given dev/ino pair.
382 ****************************************************************************/
384 void fsp_set_pending_modtime(files_struct *tfsp, time_t pmod)
388 if (null_mtime(pmod)) {
392 for (fsp = Files;fsp;fsp=fsp->next) {
393 if ( fsp->fd != -1 &&
394 fsp->dev == tfsp->dev &&
395 fsp->inode == tfsp->inode ) {
396 fsp->pending_modtime = pmod;
401 /****************************************************************************
402 Sync open files on a connection.
403 ****************************************************************************/
405 void file_sync_all(connection_struct *conn)
407 files_struct *fsp, *next;
409 for (fsp=Files;fsp;fsp=next) {
411 if ((conn == fsp->conn) && (fsp->fd != -1)) {
417 /****************************************************************************
419 ****************************************************************************/
421 void file_free(files_struct *fsp)
423 DLIST_REMOVE(Files, fsp);
425 string_free(&fsp->fsp_name);
427 if (fsp->fake_file_handle) {
428 destroy_fake_file_handle(&fsp->fake_file_handle);
431 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
434 DEBUG(5,("freed files structure %d (%d used)\n",
435 fsp->fnum, files_used));
437 /* this is paranoia, just in case someone tries to reuse the
441 if (fsp == chain_fsp) {
445 /* Closing a file can invalidate the positive cache. */
446 if (fsp == fsp_fi_cache.fsp) {
447 ZERO_STRUCT(fsp_fi_cache);
453 /****************************************************************************
454 Get a fsp from a packet given the offset of a 16 bit fnum.
455 ****************************************************************************/
457 files_struct *file_fsp(char *buf, int where)
467 fnum = SVAL(buf, where);
469 for (fsp=Files;fsp;fsp=fsp->next, count++) {
470 if (fsp->fnum == fnum) {
473 DLIST_PROMOTE(Files, fsp);
481 /****************************************************************************
482 Reset the chained fsp - done at the start of a packet reply.
483 ****************************************************************************/
485 void file_chain_reset(void)
490 /****************************************************************************
491 Save the chained fsp - done when about to do an oplock break.
492 ****************************************************************************/
494 void file_chain_save(void)
496 oplock_save_chain_fsp = chain_fsp;
499 /****************************************************************************
500 Restore the chained fsp - done after an oplock break.
501 ****************************************************************************/
503 void file_chain_restore(void)
505 chain_fsp = oplock_save_chain_fsp;