source: branches/samba-3.0/source/smbd/files.c@ 144

Last change on this file since 144 was 44, checked in by Paul Smedley, 18 years ago

Update source to 3.0.25b
File size: 15.4 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Files[] structure handling
4 Copyright (C) Andrew Tridgell 1998
5
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.
10
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.
15
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.
19*/
20
21#include "includes.h"
22
23static int real_max_open_files;
24
25#define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
26
27#define FILE_HANDLE_OFFSET 0x1000
28
29static struct bitmap *file_bmap;
30
31static files_struct *Files;
32
33/* a fsp to use when chaining */
34static files_struct *chain_fsp = NULL;
35
36static int files_used;
37
38/* A singleton cache to speed up searching by dev/inode. */
39static struct fsp_singleton_cache {
40 files_struct *fsp;
41 SMB_DEV_T dev;
42 SMB_INO_T inode;
43} fsp_fi_cache;
44
45/****************************************************************************
46 Return a unique number identifying this fsp over the life of this pid.
47****************************************************************************/
48
49static unsigned long get_gen_count(void)
50{
51 static unsigned long file_gen_counter;
52
53 if ((++file_gen_counter) == 0)
54 return ++file_gen_counter;
55 return file_gen_counter;
56}
57
58/****************************************************************************
59 Find first available file slot.
60****************************************************************************/
61
62NTSTATUS file_new(connection_struct *conn, files_struct **result)
63{
64 int i;
65 static int first_file;
66 files_struct *fsp;
67
68 /* we want to give out file handles differently on each new
69 connection because of a common bug in MS clients where they try to
70 reuse a file descriptor from an earlier smb connection. This code
71 increases the chance that the errant client will get an error rather
72 than causing corruption */
73 if (first_file == 0) {
74 first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
75 }
76
77 /* TODO: Port the id-tree implementation from Samba4 */
78
79 i = bitmap_find(file_bmap, first_file);
80 if (i == -1) {
81 DEBUG(0,("ERROR! Out of file structures\n"));
82 /* TODO: We have to unconditionally return a DOS error here,
83 * W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
84 * NTSTATUS negotiated */
85 return NT_STATUS_TOO_MANY_OPENED_FILES;
86 }
87
88 fsp = SMB_MALLOC_P(files_struct);
89 if (!fsp) {
90 return NT_STATUS_NO_MEMORY;
91 }
92
93 ZERO_STRUCTP(fsp);
94
95 fsp->fh = SMB_MALLOC_P(struct fd_handle);
96 if (!fsp->fh) {
97 SAFE_FREE(fsp);
98 return NT_STATUS_NO_MEMORY;
99 }
100
101 ZERO_STRUCTP(fsp->fh);
102
103 fsp->fh->ref_count = 1;
104 fsp->fh->fd = -1;
105
106 fsp->conn = conn;
107 fsp->fh->file_id = get_gen_count();
108 GetTimeOfDay(&fsp->open_time);
109
110 first_file = (i+1) % real_max_open_files;
111
112 bitmap_set(file_bmap, i);
113 files_used++;
114
115 fsp->fnum = i + FILE_HANDLE_OFFSET;
116 SMB_ASSERT(fsp->fnum < 65536);
117
118 string_set(&fsp->fsp_name,"");
119
120 DLIST_ADD(Files, fsp);
121
122 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
123 i, fsp->fnum, files_used));
124
125 chain_fsp = fsp;
126
127 /* A new fsp invalidates a negative fsp_fi_cache. */
128 if (fsp_fi_cache.fsp == NULL) {
129 ZERO_STRUCT(fsp_fi_cache);
130 }
131
132 *result = fsp;
133 return NT_STATUS_OK;
134}
135
136/****************************************************************************
137 Close all open files for a connection.
138****************************************************************************/
139
140void file_close_conn(connection_struct *conn)
141{
142 files_struct *fsp, *next;
143
144 for (fsp=Files;fsp;fsp=next) {
145 next = fsp->next;
146 if (fsp->conn == conn) {
147 close_file(fsp,SHUTDOWN_CLOSE);
148 }
149 }
150}
151
152/****************************************************************************
153 Close all open files for a pid and a vuid.
154****************************************************************************/
155
156void file_close_pid(uint16 smbpid, int vuid)
157{
158 files_struct *fsp, *next;
159
160 for (fsp=Files;fsp;fsp=next) {
161 next = fsp->next;
162 if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
163 close_file(fsp,SHUTDOWN_CLOSE);
164 }
165 }
166}
167
168/****************************************************************************
169 Initialise file structures.
170****************************************************************************/
171
172#define MAX_OPEN_FUDGEFACTOR 20
173
174void file_init(void)
175{
176 int request_max_open_files = lp_max_open_files();
177 int real_lim;
178
179 /*
180 * Set the max_open files to be the requested
181 * max plus a fudgefactor to allow for the extra
182 * fd's we need such as log files etc...
183 */
184 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
185
186 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
187
188 if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
189 real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
190
191 if(real_max_open_files != request_max_open_files) {
192 DEBUG(1,("file_init: Information only: requested %d \
193open files, %d are available.\n", request_max_open_files, real_max_open_files));
194 }
195
196 SMB_ASSERT(real_max_open_files > 100);
197
198 file_bmap = bitmap_allocate(real_max_open_files);
199
200 if (!file_bmap) {
201 exit_server("out of memory in file_init");
202 }
203
204 /*
205 * Ensure that pipe_handle_oppset is set correctly.
206 */
207 set_pipe_handle_offset(real_max_open_files);
208}
209
210/****************************************************************************
211 Close files open by a specified vuid.
212****************************************************************************/
213
214void file_close_user(int vuid)
215{
216 files_struct *fsp, *next;
217
218 for (fsp=Files;fsp;fsp=next) {
219 next=fsp->next;
220 if (fsp->vuid == vuid) {
221 close_file(fsp,SHUTDOWN_CLOSE);
222 }
223 }
224}
225
226/****************************************************************************
227 Debug to enumerate all open files in the smbd.
228****************************************************************************/
229
230void file_dump_open_table(void)
231{
232 int count=0;
233 files_struct *fsp;
234
235 for (fsp=Files;fsp;fsp=fsp->next,count++) {
236 DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, fileid = %lu, dev = %x, inode = %.0f\n",
237 count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->file_id,
238 (unsigned int)fsp->dev, (double)fsp->inode ));
239 }
240}
241
242/****************************************************************************
243 Find a fsp given a file descriptor.
244****************************************************************************/
245
246files_struct *file_find_fd(int fd)
247{
248 int count=0;
249 files_struct *fsp;
250
251 for (fsp=Files;fsp;fsp=fsp->next,count++) {
252 if (fsp->fh->fd == fd) {
253 if (count > 10) {
254 DLIST_PROMOTE(Files, fsp);
255 }
256 return fsp;
257 }
258 }
259
260 return NULL;
261}
262
263/****************************************************************************
264 Find a fsp given a device, inode and file_id.
265****************************************************************************/
266
267files_struct *file_find_dif(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
268{
269 int count=0;
270 files_struct *fsp;
271
272 for (fsp=Files;fsp;fsp=fsp->next,count++) {
273 /* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
274 if (fsp->dev == dev &&
275 fsp->inode == inode &&
276 fsp->fh->file_id == file_id ) {
277 if (count > 10) {
278 DLIST_PROMOTE(Files, fsp);
279 }
280 /* Paranoia check. */
281 if ((fsp->fh->fd == -1) &&
282 (fsp->oplock_type != NO_OPLOCK) &&
283 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
284 DEBUG(0,("file_find_dif: file %s dev = %x, inode = %.0f, file_id = %u \
285oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name, (unsigned int)fsp->dev,
286 (double)fsp->inode, (unsigned int)fsp->fh->file_id,
287 (unsigned int)fsp->oplock_type ));
288 smb_panic("file_find_dif\n");
289 }
290 return fsp;
291 }
292 }
293
294 return NULL;
295}
296
297/****************************************************************************
298 Check if an fsp still exists.
299****************************************************************************/
300
301files_struct *file_find_fsp(files_struct *orig_fsp)
302{
303 files_struct *fsp;
304
305 for (fsp=Files;fsp;fsp=fsp->next) {
306 if (fsp == orig_fsp)
307 return fsp;
308 }
309
310 return NULL;
311}
312
313/****************************************************************************
314 Find the first fsp given a device and inode.
315 We use a singleton cache here to speed up searching from getfilepathinfo
316 calls.
317****************************************************************************/
318
319files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
320{
321 files_struct *fsp;
322
323 if (fsp_fi_cache.dev == dev && fsp_fi_cache.inode == inode) {
324 /* Positive or negative cache hit. */
325 return fsp_fi_cache.fsp;
326 }
327
328 fsp_fi_cache.dev = dev;
329 fsp_fi_cache.inode = inode;
330
331 for (fsp=Files;fsp;fsp=fsp->next) {
332 if ( fsp->fh->fd != -1 &&
333 fsp->dev == dev &&
334 fsp->inode == inode ) {
335 /* Setup positive cache. */
336 fsp_fi_cache.fsp = fsp;
337 return fsp;
338 }
339 }
340
341 /* Setup negative cache. */
342 fsp_fi_cache.fsp = NULL;
343 return NULL;
344}
345
346/****************************************************************************
347 Find the next fsp having the same device and inode.
348****************************************************************************/
349
350files_struct *file_find_di_next(files_struct *start_fsp)
351{
352 files_struct *fsp;
353
354 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
355 if ( fsp->fh->fd != -1 &&
356 fsp->dev == start_fsp->dev &&
357 fsp->inode == start_fsp->inode )
358 return fsp;
359 }
360
361 return NULL;
362}
363
364/****************************************************************************
365 Find a fsp that is open for printing.
366****************************************************************************/
367
368files_struct *file_find_print(void)
369{
370 files_struct *fsp;
371
372 for (fsp=Files;fsp;fsp=fsp->next) {
373 if (fsp->print_file) {
374 return fsp;
375 }
376 }
377
378 return NULL;
379}
380
381/****************************************************************************
382 Set a pending modtime across all files with a given dev/ino pair.
383 Record the owner of that modtime.
384****************************************************************************/
385
386void fsp_set_pending_modtime(files_struct *tfsp, const struct timespec mod)
387{
388 files_struct *fsp;
389
390 if (null_timespec(mod)) {
391 return;
392 }
393
394 for (fsp = Files;fsp;fsp=fsp->next) {
395 if ( fsp->fh->fd != -1 &&
396 fsp->dev == tfsp->dev &&
397 fsp->inode == tfsp->inode ) {
398 fsp->pending_modtime = mod;
399 fsp->pending_modtime_owner = False;
400 }
401 }
402
403 tfsp->pending_modtime_owner = True;
404}
405
406/****************************************************************************
407 Sync open files on a connection.
408****************************************************************************/
409
410void file_sync_all(connection_struct *conn)
411{
412 files_struct *fsp, *next;
413
414 for (fsp=Files;fsp;fsp=next) {
415 next=fsp->next;
416 if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
417 sync_file(conn, fsp, True /* write through */);
418 }
419 }
420}
421
422/****************************************************************************
423 Free up a fsp.
424****************************************************************************/
425
426void file_free(files_struct *fsp)
427{
428 DLIST_REMOVE(Files, fsp);
429
430 string_free(&fsp->fsp_name);
431
432 if (fsp->fake_file_handle) {
433 destroy_fake_file_handle(&fsp->fake_file_handle);
434 }
435
436 if (fsp->fh->ref_count == 1) {
437 SAFE_FREE(fsp->fh);
438 } else {
439 fsp->fh->ref_count--;
440 }
441
442 if (fsp->notify) {
443 notify_remove(fsp->conn->notify_ctx, fsp);
444 TALLOC_FREE(fsp->notify);
445 }
446
447 /* Ensure this event will never fire. */
448 TALLOC_FREE(fsp->oplock_timeout);
449
450 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
451 files_used--;
452
453 DEBUG(5,("freed files structure %d (%d used)\n",
454 fsp->fnum, files_used));
455
456 /* this is paranoia, just in case someone tries to reuse the
457 information */
458 ZERO_STRUCTP(fsp);
459
460 if (fsp == chain_fsp) {
461 chain_fsp = NULL;
462 }
463
464 /* Closing a file can invalidate the positive cache. */
465 if (fsp == fsp_fi_cache.fsp) {
466 ZERO_STRUCT(fsp_fi_cache);
467 }
468
469 SAFE_FREE(fsp);
470}
471
472/****************************************************************************
473 Get an fsp from a 16 bit fnum.
474****************************************************************************/
475
476files_struct *file_fnum(uint16 fnum)
477{
478 files_struct *fsp;
479 int count=0;
480
481 for (fsp=Files;fsp;fsp=fsp->next, count++) {
482 if (fsp->fnum == fnum) {
483 if (count > 10) {
484 DLIST_PROMOTE(Files, fsp);
485 }
486 return fsp;
487 }
488 }
489 return NULL;
490}
491
492/****************************************************************************
493 Get an fsp from a packet given the offset of a 16 bit fnum.
494****************************************************************************/
495
496files_struct *file_fsp(char *buf, int where)
497{
498 files_struct *fsp;
499
500 if (chain_fsp) {
501 return chain_fsp;
502 }
503
504 if (!buf) {
505 return NULL;
506 }
507
508 fsp = file_fnum(SVAL(buf, where));
509 if (fsp) {
510 chain_fsp = fsp;
511 }
512 return fsp;
513}
514
515/****************************************************************************
516 Reset the chained fsp - done at the start of a packet reply.
517****************************************************************************/
518
519void file_chain_reset(void)
520{
521 chain_fsp = NULL;
522}
523
524/****************************************************************************
525 Duplicate the file handle part for a DOS or FCB open.
526****************************************************************************/
527
528NTSTATUS dup_file_fsp(files_struct *fsp,
529 uint32 access_mask,
530 uint32 share_access,
531 uint32 create_options,
532 files_struct **result)
533{
534 NTSTATUS status;
535 files_struct *dup_fsp;
536
537 status = file_new(fsp->conn, &dup_fsp);
538
539 if (!NT_STATUS_IS_OK(status)) {
540 return status;
541 }
542
543 SAFE_FREE(dup_fsp->fh);
544
545 dup_fsp->fh = fsp->fh;
546 dup_fsp->fh->ref_count++;
547
548 dup_fsp->dev = fsp->dev;
549 dup_fsp->inode = fsp->inode;
550 dup_fsp->initial_allocation_size = fsp->initial_allocation_size;
551 dup_fsp->mode = fsp->mode;
552 dup_fsp->file_pid = fsp->file_pid;
553 dup_fsp->vuid = fsp->vuid;
554 dup_fsp->open_time = fsp->open_time;
555 dup_fsp->access_mask = access_mask;
556 dup_fsp->share_access = share_access;
557 dup_fsp->pending_modtime_owner = fsp->pending_modtime_owner;
558 dup_fsp->pending_modtime = fsp->pending_modtime;
559 dup_fsp->last_write_time = fsp->last_write_time;
560 dup_fsp->oplock_type = fsp->oplock_type;
561 dup_fsp->can_lock = fsp->can_lock;
562 dup_fsp->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
563 if (!CAN_WRITE(fsp->conn)) {
564 dup_fsp->can_write = False;
565 } else {
566 dup_fsp->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
567 }
568 dup_fsp->print_file = fsp->print_file;
569 dup_fsp->modified = fsp->modified;
570 dup_fsp->is_directory = fsp->is_directory;
571 dup_fsp->is_stat = fsp->is_stat;
572 dup_fsp->aio_write_behind = fsp->aio_write_behind;
573 string_set(&dup_fsp->fsp_name,fsp->fsp_name);
574
575 *result = dup_fsp;
576 return NT_STATUS_OK;
577}
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