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;
36 static int files_used;
38 /* A singleton cache to speed up searching by dev/inode. */
39 static struct fsp_singleton_cache {
45 /****************************************************************************
46 Return a unique number identifying this fsp over the life of this pid.
47 ****************************************************************************/
49 static unsigned long get_gen_count(void)
51 static unsigned long file_gen_counter;
53 if ((++file_gen_counter) == 0)
54 return ++file_gen_counter;
55 return file_gen_counter;
58 /****************************************************************************
59 Find first available file slot.
60 ****************************************************************************/
62 files_struct *file_new(connection_struct *conn)
65 static int first_file;
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;
77 /* TODO: Port the id-tree implementation from Samba4 */
79 i = bitmap_find(file_bmap, first_file);
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 set_saved_ntstatus(NT_STATUS_TOO_MANY_OPENED_FILES);
89 fsp = SMB_MALLOC_P(files_struct);
91 set_saved_ntstatus(NT_STATUS_NO_MEMORY);
97 fsp->fh = SMB_MALLOC_P(struct fd_handle);
100 set_saved_ntstatus(NT_STATUS_NO_MEMORY);
104 ZERO_STRUCTP(fsp->fh);
106 fsp->fh->ref_count = 1;
110 fsp->fh->file_id = get_gen_count();
111 GetTimeOfDay(&fsp->open_time);
113 first_file = (i+1) % real_max_open_files;
115 bitmap_set(file_bmap, i);
118 fsp->fnum = i + FILE_HANDLE_OFFSET;
119 SMB_ASSERT(fsp->fnum < 65536);
121 string_set(&fsp->fsp_name,"");
123 DLIST_ADD(Files, fsp);
125 DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
126 i, fsp->fnum, files_used));
130 /* A new fsp invalidates a negative fsp_fi_cache. */
131 if (fsp_fi_cache.fsp == NULL) {
132 ZERO_STRUCT(fsp_fi_cache);
138 /****************************************************************************
139 Close all open files for a connection.
140 ****************************************************************************/
142 void file_close_conn(connection_struct *conn)
144 files_struct *fsp, *next;
146 for (fsp=Files;fsp;fsp=next) {
148 if (fsp->conn == conn) {
149 close_file(fsp,SHUTDOWN_CLOSE);
154 /****************************************************************************
155 Close all open files for a pid and a vuid.
156 ****************************************************************************/
158 void file_close_pid(uint16 smbpid, int vuid)
160 files_struct *fsp, *next;
162 for (fsp=Files;fsp;fsp=next) {
164 if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
165 close_file(fsp,SHUTDOWN_CLOSE);
170 /****************************************************************************
171 Initialise file structures.
172 ****************************************************************************/
174 #define MAX_OPEN_FUDGEFACTOR 20
178 int request_max_open_files = lp_max_open_files();
182 * Set the max_open files to be the requested
183 * max plus a fudgefactor to allow for the extra
184 * fd's we need such as log files etc...
186 real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
188 real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
190 if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
191 real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
193 if(real_max_open_files != request_max_open_files) {
194 DEBUG(1,("file_init: Information only: requested %d \
195 open files, %d are available.\n", request_max_open_files, real_max_open_files));
198 SMB_ASSERT(real_max_open_files > 100);
200 file_bmap = bitmap_allocate(real_max_open_files);
203 exit_server("out of memory in file_init");
207 * Ensure that pipe_handle_oppset is set correctly.
209 set_pipe_handle_offset(real_max_open_files);
212 /****************************************************************************
213 Close files open by a specified vuid.
214 ****************************************************************************/
216 void file_close_user(int vuid)
218 files_struct *fsp, *next;
220 for (fsp=Files;fsp;fsp=next) {
222 if (fsp->vuid == vuid) {
223 close_file(fsp,SHUTDOWN_CLOSE);
228 /****************************************************************************
229 Debug to enumerate all open files in the smbd.
230 ****************************************************************************/
232 void file_dump_open_table(void)
237 for (fsp=Files;fsp;fsp=fsp->next,count++) {
238 DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, fileid = %lu, dev = %x, inode = %.0f\n",
239 count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->file_id,
240 (unsigned int)fsp->dev, (double)fsp->inode ));
244 /****************************************************************************
245 Find a fsp given a file descriptor.
246 ****************************************************************************/
248 files_struct *file_find_fd(int fd)
253 for (fsp=Files;fsp;fsp=fsp->next,count++) {
254 if (fsp->fh->fd == fd) {
256 DLIST_PROMOTE(Files, fsp);
265 /****************************************************************************
266 Find a fsp given a device, inode and file_id.
267 ****************************************************************************/
269 files_struct *file_find_dif(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
274 for (fsp=Files;fsp;fsp=fsp->next,count++) {
275 /* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
276 if (fsp->dev == dev &&
277 fsp->inode == inode &&
278 fsp->fh->file_id == file_id ) {
280 DLIST_PROMOTE(Files, fsp);
282 /* Paranoia check. */
283 if ((fsp->fh->fd == -1) &&
284 (fsp->oplock_type != NO_OPLOCK) &&
285 (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
286 DEBUG(0,("file_find_dif: file %s dev = %x, inode = %.0f, file_id = %u \
287 oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name, (unsigned int)fsp->dev,
288 (double)fsp->inode, (unsigned int)fsp->fh->file_id,
289 (unsigned int)fsp->oplock_type ));
290 smb_panic("file_find_dif\n");
299 /****************************************************************************
300 Check if an fsp still exists.
301 ****************************************************************************/
303 files_struct *file_find_fsp(files_struct *orig_fsp)
307 for (fsp=Files;fsp;fsp=fsp->next) {
315 /****************************************************************************
316 Find the first fsp given a device and inode.
317 We use a singleton cache here to speed up searching from getfilepathinfo
319 ****************************************************************************/
321 files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
325 if (fsp_fi_cache.dev == dev && fsp_fi_cache.inode == inode) {
326 /* Positive or negative cache hit. */
327 return fsp_fi_cache.fsp;
330 fsp_fi_cache.dev = dev;
331 fsp_fi_cache.inode = inode;
333 for (fsp=Files;fsp;fsp=fsp->next) {
334 if ( fsp->fh->fd != -1 &&
336 fsp->inode == inode ) {
337 /* Setup positive cache. */
338 fsp_fi_cache.fsp = fsp;
343 /* Setup negative cache. */
344 fsp_fi_cache.fsp = NULL;
348 /****************************************************************************
349 Find the next fsp having the same device and inode.
350 ****************************************************************************/
352 files_struct *file_find_di_next(files_struct *start_fsp)
356 for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
357 if ( fsp->fh->fd != -1 &&
358 fsp->dev == start_fsp->dev &&
359 fsp->inode == start_fsp->inode )
366 /****************************************************************************
367 Find a fsp that is open for printing.
368 ****************************************************************************/
370 files_struct *file_find_print(void)
374 for (fsp=Files;fsp;fsp=fsp->next) {
375 if (fsp->print_file) {
383 /****************************************************************************
384 Set a pending modtime across all files with a given dev/ino pair.
385 Record the owner of that modtime.
386 ****************************************************************************/
388 void fsp_set_pending_modtime(files_struct *tfsp, time_t pmod)
392 if (null_mtime(pmod)) {
396 for (fsp = Files;fsp;fsp=fsp->next) {
397 if ( fsp->fh->fd != -1 &&
398 fsp->dev == tfsp->dev &&
399 fsp->inode == tfsp->inode ) {
400 fsp->pending_modtime = pmod;
401 fsp->pending_modtime_owner = False;
405 tfsp->pending_modtime_owner = True;
408 /****************************************************************************
409 Sync open files on a connection.
410 ****************************************************************************/
412 void file_sync_all(connection_struct *conn)
414 files_struct *fsp, *next;
416 for (fsp=Files;fsp;fsp=next) {
418 if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
419 sync_file(conn, fsp, True /* write through */);
424 /****************************************************************************
426 ****************************************************************************/
428 void file_free(files_struct *fsp)
430 DLIST_REMOVE(Files, fsp);
432 string_free(&fsp->fsp_name);
434 if (fsp->fake_file_handle) {
435 destroy_fake_file_handle(&fsp->fake_file_handle);
438 if (fsp->fh->ref_count == 1) {
441 fsp->fh->ref_count--;
444 bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
447 DEBUG(5,("freed files structure %d (%d used)\n",
448 fsp->fnum, files_used));
450 /* this is paranoia, just in case someone tries to reuse the
454 if (fsp == chain_fsp) {
458 /* Closing a file can invalidate the positive cache. */
459 if (fsp == fsp_fi_cache.fsp) {
460 ZERO_STRUCT(fsp_fi_cache);
466 /****************************************************************************
467 Get a fsp from a packet given the offset of a 16 bit fnum.
468 ****************************************************************************/
470 files_struct *file_fsp(char *buf, int where)
480 fnum = SVAL(buf, where);
482 for (fsp=Files;fsp;fsp=fsp->next, count++) {
483 if (fsp->fnum == fnum) {
486 DLIST_PROMOTE(Files, fsp);
494 /****************************************************************************
495 Reset the chained fsp - done at the start of a packet reply.
496 ****************************************************************************/
498 void file_chain_reset(void)
503 /****************************************************************************
504 Duplicate the file handle part for a DOS or FCB open.
505 ****************************************************************************/
507 files_struct *dup_file_fsp(files_struct *fsp,
510 uint32 create_options)
512 files_struct *dup_fsp = file_new(fsp->conn);
518 SAFE_FREE(dup_fsp->fh);
520 dup_fsp->fh = fsp->fh;
521 dup_fsp->fh->ref_count++;
523 dup_fsp->dev = fsp->dev;
524 dup_fsp->inode = fsp->inode;
525 dup_fsp->initial_allocation_size = fsp->initial_allocation_size;
526 dup_fsp->mode = fsp->mode;
527 dup_fsp->file_pid = fsp->file_pid;
528 dup_fsp->vuid = fsp->vuid;
529 dup_fsp->open_time = fsp->open_time;
530 dup_fsp->access_mask = access_mask;
531 dup_fsp->share_access = share_access;
532 dup_fsp->pending_modtime_owner = fsp->pending_modtime_owner;
533 dup_fsp->pending_modtime = fsp->pending_modtime;
534 dup_fsp->last_write_time = fsp->last_write_time;
535 dup_fsp->oplock_type = fsp->oplock_type;
536 dup_fsp->can_lock = fsp->can_lock;
537 dup_fsp->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
538 if (!CAN_WRITE(fsp->conn)) {
539 dup_fsp->can_write = False;
541 dup_fsp->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
543 dup_fsp->print_file = fsp->print_file;
544 dup_fsp->modified = fsp->modified;
545 dup_fsp->is_directory = fsp->is_directory;
546 dup_fsp->is_stat = fsp->is_stat;
547 dup_fsp->aio_write_behind = fsp->aio_write_behind;
548 string_set(&dup_fsp->fsp_name,fsp->fsp_name);