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 3 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, see <http://www.gnu.org/licenses/>.
21 #include "smbd/globals.h"
23 #define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
25 #define FILE_HANDLE_OFFSET 0x1000
27 /****************************************************************************
28 Return a unique number identifying this fsp over the life of this pid.
29 ****************************************************************************/
31 static unsigned long get_gen_count(void)
33 if ((++file_gen_counter) == 0)
34 return ++file_gen_counter;
35 return file_gen_counter;
38 /****************************************************************************
39 Find first available file slot.
40 ****************************************************************************/
42 NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
43 files_struct **result)
48 /* we want to give out file handles differently on each new
49 connection because of a common bug in MS clients where they try to
50 reuse a file descriptor from an earlier smb connection. This code
51 increases the chance that the errant client will get an error rather
52 than causing corruption */
53 if (first_file == 0) {
54 first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
57 /* TODO: Port the id-tree implementation from Samba4 */
59 i = bitmap_find(file_bmap, first_file);
61 DEBUG(0,("ERROR! Out of file structures\n"));
62 /* TODO: We have to unconditionally return a DOS error here,
63 * W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
64 * NTSTATUS negotiated */
65 return NT_STATUS_TOO_MANY_OPENED_FILES;
69 * Make a child of the connection_struct as an fsp can't exist
70 * indepenedent of a connection.
72 fsp = talloc_zero(conn, struct files_struct);
74 return NT_STATUS_NO_MEMORY;
78 * This can't be a child of fsp because the file_handle can be ref'd
79 * when doing a dos/fcb open, which will then share the file_handle
80 * across multiple fsps.
82 fsp->fh = talloc_zero(conn, struct fd_handle);
85 return NT_STATUS_NO_MEMORY;
88 fsp->fh->ref_count = 1;
92 fsp->fh->gen_id = get_gen_count();
93 GetTimeOfDay(&fsp->open_time);
95 first_file = (i+1) % real_max_open_files;
97 bitmap_set(file_bmap, i);
100 fsp->fnum = i + FILE_HANDLE_OFFSET;
101 SMB_ASSERT(fsp->fnum < 65536);
103 string_set(&fsp->fsp_name,"");
105 DLIST_ADD(Files, fsp);
107 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
108 i, fsp->fnum, files_used));
111 req->chain_fsp = fsp;
114 /* A new fsp invalidates the positive and
115 negative fsp_fi_cache as the new fsp is pushed
116 at the start of the list and we search from
117 a cache hit to the *end* of the list. */
119 ZERO_STRUCT(fsp_fi_cache);
121 conn->num_files_open++;
127 /****************************************************************************
128 Close all open files for a connection.
129 ****************************************************************************/
131 void file_close_conn(connection_struct *conn)
133 files_struct *fsp, *next;
135 for (fsp=Files;fsp;fsp=next) {
137 if (fsp->conn == conn) {
138 close_file(NULL, fsp, SHUTDOWN_CLOSE);
143 /****************************************************************************
144 Close all open files for a pid and a vuid.
145 ****************************************************************************/
147 void file_close_pid(uint16 smbpid, int vuid)
149 files_struct *fsp, *next;
151 for (fsp=Files;fsp;fsp=next) {
153 if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
154 close_file(NULL, fsp, SHUTDOWN_CLOSE);
159 /****************************************************************************
160 Initialise file structures.
161 ****************************************************************************/
163 #define MAX_OPEN_FUDGEFACTOR 20
167 int request_max_open_files = lp_max_open_files();
171 * Set the max_open files to be the requested
172 * max plus a fudgefactor to allow for the extra
173 * fd's we need such as log files etc...
175 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
177 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
179 if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
180 real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
182 if(real_max_open_files != request_max_open_files) {
183 DEBUG(1,("file_init: Information only: requested %d \
184 open files, %d are available.\n", request_max_open_files, real_max_open_files));
187 SMB_ASSERT(real_max_open_files > 100);
189 file_bmap = bitmap_allocate(real_max_open_files);
192 exit_server("out of memory in file_init");
196 /****************************************************************************
197 Close files open by a specified vuid.
198 ****************************************************************************/
200 void file_close_user(int vuid)
202 files_struct *fsp, *next;
204 for (fsp=Files;fsp;fsp=next) {
206 if (fsp->vuid == vuid) {
207 close_file(NULL, fsp, SHUTDOWN_CLOSE);
213 * Walk the files table until "fn" returns non-NULL
216 struct files_struct *file_walk_table(
217 struct files_struct *(*fn)(struct files_struct *fsp,
221 struct files_struct *fsp, *next;
223 for (fsp = Files; fsp; fsp = next) {
224 struct files_struct *ret;
226 ret = fn(fsp, private_data);
234 /****************************************************************************
235 Debug to enumerate all open files in the smbd.
236 ****************************************************************************/
238 void file_dump_open_table(void)
243 for (fsp=Files;fsp;fsp=fsp->next,count++) {
244 DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, gen = %lu, fileid=%s\n",
245 count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->gen_id,
246 file_id_string_tos(&fsp->file_id)));
250 /****************************************************************************
251 Find a fsp given a file descriptor.
252 ****************************************************************************/
254 files_struct *file_find_fd(int fd)
259 for (fsp=Files;fsp;fsp=fsp->next,count++) {
260 if (fsp->fh->fd == fd) {
262 DLIST_PROMOTE(Files, fsp);
271 /****************************************************************************
272 Find a fsp given a device, inode and file_id.
273 ****************************************************************************/
275 files_struct *file_find_dif(struct file_id id, unsigned long gen_id)
280 for (fsp=Files;fsp;fsp=fsp->next,count++) {
281 /* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
282 if (file_id_equal(&fsp->file_id, &id) &&
283 fsp->fh->gen_id == gen_id ) {
285 DLIST_PROMOTE(Files, fsp);
287 /* Paranoia check. */
288 if ((fsp->fh->fd == -1) &&
289 (fsp->oplock_type != NO_OPLOCK) &&
290 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
291 DEBUG(0,("file_find_dif: file %s file_id = %s, gen = %u \
292 oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name,
293 file_id_string_tos(&fsp->file_id),
294 (unsigned int)fsp->fh->gen_id,
295 (unsigned int)fsp->oplock_type ));
296 smb_panic("file_find_dif");
305 /****************************************************************************
306 Check if an fsp still exists.
307 ****************************************************************************/
309 files_struct *file_find_fsp(files_struct *orig_fsp)
313 for (fsp=Files;fsp;fsp=fsp->next) {
321 /****************************************************************************
322 Find the first fsp given a device and inode.
323 We use a singleton cache here to speed up searching from getfilepathinfo
325 ****************************************************************************/
327 files_struct *file_find_di_first(struct file_id id)
331 if (file_id_equal(&fsp_fi_cache.id, &id)) {
332 /* Positive or negative cache hit. */
333 return fsp_fi_cache.fsp;
336 fsp_fi_cache.id = id;
338 for (fsp=Files;fsp;fsp=fsp->next) {
339 if (file_id_equal(&fsp->file_id, &id)) {
340 /* Setup positive cache. */
341 fsp_fi_cache.fsp = fsp;
346 /* Setup negative cache. */
347 fsp_fi_cache.fsp = NULL;
351 /****************************************************************************
352 Find the next fsp having the same device and inode.
353 ****************************************************************************/
355 files_struct *file_find_di_next(files_struct *start_fsp)
359 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
360 if (file_id_equal(&fsp->file_id, &start_fsp->file_id)) {
368 /****************************************************************************
369 Find a fsp that is open for printing.
370 ****************************************************************************/
372 files_struct *file_find_print(void)
376 for (fsp=Files;fsp;fsp=fsp->next) {
377 if (fsp->print_file) {
385 /****************************************************************************
386 Find any fsp open with a pathname below that of an already open path.
387 ****************************************************************************/
389 bool file_find_subpath(files_struct *dir_fsp)
393 char *d_fullname = talloc_asprintf(talloc_tos(),
395 dir_fsp->conn->connectpath,
402 dlen = strlen(d_fullname);
404 for (fsp=Files;fsp;fsp=fsp->next) {
407 if (fsp == dir_fsp) {
411 d1_fullname = talloc_asprintf(talloc_tos(),
413 fsp->conn->connectpath,
416 if (strnequal(d_fullname, d1_fullname, dlen)) {
417 TALLOC_FREE(d_fullname);
418 TALLOC_FREE(d1_fullname);
421 TALLOC_FREE(d1_fullname);
424 TALLOC_FREE(d_fullname);
428 /****************************************************************************
429 Sync open files on a connection.
430 ****************************************************************************/
432 void file_sync_all(connection_struct *conn)
434 files_struct *fsp, *next;
436 for (fsp=Files;fsp;fsp=next) {
438 if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
439 sync_file(conn, fsp, True /* write through */);
444 /****************************************************************************
446 ****************************************************************************/
448 void file_free(struct smb_request *req, files_struct *fsp)
450 DLIST_REMOVE(Files, fsp);
452 string_free(&fsp->fsp_name);
454 TALLOC_FREE(fsp->fake_file_handle);
456 if (fsp->fh->ref_count == 1) {
457 TALLOC_FREE(fsp->fh);
459 fsp->fh->ref_count--;
463 if (fsp->is_directory) {
464 notify_remove_onelevel(fsp->conn->notify_ctx,
467 notify_remove(fsp->conn->notify_ctx, fsp);
468 TALLOC_FREE(fsp->notify);
471 /* Ensure this event will never fire. */
472 TALLOC_FREE(fsp->oplock_timeout);
474 /* Ensure this event will never fire. */
475 TALLOC_FREE(fsp->update_write_time_event);
477 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
480 DEBUG(5,("freed files structure %d (%d used)\n",
481 fsp->fnum, files_used));
483 fsp->conn->num_files_open--;
485 if ((req != NULL) && (fsp == req->chain_fsp)) {
486 req->chain_fsp = NULL;
489 /* Closing a file can invalidate the positive cache. */
490 if (fsp == fsp_fi_cache.fsp) {
491 ZERO_STRUCT(fsp_fi_cache);
494 /* Drop all remaining extensions. */
495 while (fsp->vfs_extension) {
496 vfs_remove_fsp_extension(fsp->vfs_extension->owner, fsp);
499 /* this is paranoia, just in case someone tries to reuse the
506 /****************************************************************************
507 Get an fsp from a 16 bit fnum.
508 ****************************************************************************/
510 files_struct *file_fnum(uint16 fnum)
515 for (fsp=Files;fsp;fsp=fsp->next, count++) {
516 if (fsp->fnum == fnum) {
518 DLIST_PROMOTE(Files, fsp);
526 /****************************************************************************
527 Get an fsp from a packet given the offset of a 16 bit fnum.
528 ****************************************************************************/
530 files_struct *file_fsp(struct smb_request *req, uint16 fid)
534 if ((req != NULL) && (req->chain_fsp != NULL)) {
535 return req->chain_fsp;
538 fsp = file_fnum(fid);
539 if ((fsp != NULL) && (req != NULL)) {
540 req->chain_fsp = fsp;
545 /****************************************************************************
546 Duplicate the file handle part for a DOS or FCB open.
547 ****************************************************************************/
549 void dup_file_fsp(struct smb_request *req, files_struct *from,
550 uint32 access_mask, uint32 share_access,
551 uint32 create_options, files_struct *to)
558 to->file_id = from->file_id;
559 to->initial_allocation_size = from->initial_allocation_size;
560 to->mode = from->mode;
561 to->file_pid = from->file_pid;
562 to->vuid = from->vuid;
563 to->open_time = from->open_time;
564 to->access_mask = access_mask;
565 to->share_access = share_access;
566 to->oplock_type = from->oplock_type;
567 to->can_lock = from->can_lock;
568 to->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
569 if (!CAN_WRITE(from->conn)) {
570 to->can_write = False;
572 to->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
574 to->print_file = from->print_file;
575 to->modified = from->modified;
576 to->is_directory = from->is_directory;
577 to->aio_write_behind = from->aio_write_behind;
578 string_set(&to->fsp_name,from->fsp_name);