Fix for CVE-2009-2906.
[Samba.git] / source3 / smbd / fileio.c
blobadf664b3960301da1713a81589b8b8e75a6f9307
1 /*
2 Unix SMB/Netbios implementation.
3 Version 1.9.
4 read/write to a files_struct
5 Copyright (C) Andrew Tridgell 1992-1998
6 Copyright (C) Jeremy Allison 2000-2002. - write cache.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "includes.h"
23 #include "smbd/globals.h"
25 static bool setup_write_cache(files_struct *, SMB_OFF_T);
27 /****************************************************************************
28 Read from write cache if we can.
29 ****************************************************************************/
31 static bool read_from_write_cache(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
33 write_cache *wcp = fsp->wcp;
35 if(!wcp) {
36 return False;
39 if( n > wcp->data_size || pos < wcp->offset || pos + n > wcp->offset + wcp->data_size) {
40 return False;
43 memcpy(data, wcp->data + (pos - wcp->offset), n);
45 DO_PROFILE_INC(writecache_read_hits);
47 return True;
50 /****************************************************************************
51 Read from a file.
52 ****************************************************************************/
54 ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
56 ssize_t ret=0,readret;
58 /* you can't read from print files */
59 if (fsp->print_file) {
60 return -1;
64 * Serve from write cache if we can.
67 if(read_from_write_cache(fsp, data, pos, n)) {
68 fsp->fh->pos = pos + n;
69 fsp->fh->position_information = fsp->fh->pos;
70 return n;
73 flush_write_cache(fsp, READ_FLUSH);
75 fsp->fh->pos = pos;
77 if (n > 0) {
78 #ifdef DMF_FIX
79 int numretries = 3;
80 tryagain:
81 readret = SMB_VFS_PREAD(fsp,data,n,pos);
83 if (readret == -1) {
84 if ((errno == EAGAIN) && numretries) {
85 DEBUG(3,("read_file EAGAIN retry in 10 seconds\n"));
86 (void)sleep(10);
87 --numretries;
88 goto tryagain;
90 return -1;
92 #else /* NO DMF fix. */
93 readret = SMB_VFS_PREAD(fsp,data,n,pos);
95 if (readret == -1) {
96 return -1;
98 #endif
99 if (readret > 0) {
100 ret += readret;
104 DEBUG(10,("read_file (%s): pos = %.0f, size = %lu, returned %lu\n",
105 fsp->fsp_name, (double)pos, (unsigned long)n, (long)ret ));
107 fsp->fh->pos += ret;
108 fsp->fh->position_information = fsp->fh->pos;
110 return(ret);
113 /****************************************************************************
114 *Really* write to a file.
115 ****************************************************************************/
117 static ssize_t real_write_file(struct smb_request *req,
118 files_struct *fsp,
119 const char *data,
120 SMB_OFF_T pos,
121 size_t n)
123 ssize_t ret;
125 if (pos == -1) {
126 ret = vfs_write_data(req, fsp, data, n);
127 } else {
128 fsp->fh->pos = pos;
129 if (pos && lp_strict_allocate(SNUM(fsp->conn))) {
130 if (vfs_fill_sparse(fsp, pos) == -1) {
131 return -1;
134 ret = vfs_pwrite_data(req, fsp, data, n, pos);
137 DEBUG(10,("real_write_file (%s): pos = %.0f, size = %lu, returned %ld\n",
138 fsp->fsp_name, (double)pos, (unsigned long)n, (long)ret ));
140 if (ret != -1) {
141 fsp->fh->pos += ret;
143 /* Yes - this is correct - writes don't update this. JRA. */
144 /* Found by Samba4 tests. */
145 #if 0
146 fsp->position_information = fsp->pos;
147 #endif
150 return ret;
153 /****************************************************************************
154 File size cache change.
155 Updates size on disk but doesn't flush the cache.
156 ****************************************************************************/
158 static int wcp_file_size_change(files_struct *fsp)
160 int ret;
161 write_cache *wcp = fsp->wcp;
163 wcp->file_size = wcp->offset + wcp->data_size;
164 ret = SMB_VFS_FTRUNCATE(fsp, wcp->file_size);
165 if (ret == -1) {
166 DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f error %s\n",
167 fsp->fsp_name, (double)wcp->file_size, strerror(errno) ));
169 return ret;
172 static void update_write_time_handler(struct event_context *ctx,
173 struct timed_event *te,
174 struct timeval now,
175 void *private_data)
177 files_struct *fsp = (files_struct *)private_data;
179 /* Remove the timed event handler. */
180 TALLOC_FREE(fsp->update_write_time_event);
181 DEBUG(5, ("Update write time on %s\n", fsp->fsp_name));
183 /* change the write time if not already changed by someone else */
184 update_write_time(fsp);
187 /*********************************************************
188 Schedule a write time update for WRITE_TIME_UPDATE_USEC_DELAY
189 in the future.
190 *********************************************************/
192 void trigger_write_time_update(struct files_struct *fsp)
194 int delay;
196 if (fsp->write_time_forced) {
197 /* No point - "sticky" write times
198 * in effect.
200 return;
203 if (fsp->update_write_time_triggered) {
205 * We only update the write time
206 * on the first write. After that
207 * no other writes affect this.
209 return;
211 fsp->update_write_time_triggered = true;
213 delay = lp_parm_int(SNUM(fsp->conn),
214 "smbd", "writetimeupdatedelay",
215 WRITE_TIME_UPDATE_USEC_DELAY);
217 /* trigger the update 2 seconds later */
218 fsp->update_write_time_on_close = true;
219 fsp->update_write_time_event =
220 event_add_timed(smbd_event_context(), NULL,
221 timeval_current_ofs(0, delay),
222 update_write_time_handler, fsp);
225 void trigger_write_time_update_immediate(struct files_struct *fsp)
227 if (fsp->write_time_forced) {
229 * No point - "sticky" write times
230 * in effect.
232 return;
235 TALLOC_FREE(fsp->update_write_time_event);
236 DEBUG(5, ("Update write time immediate on %s\n", fsp->fsp_name));
238 fsp->update_write_time_triggered = true;
240 fsp->update_write_time_on_close = false;
241 update_write_time(fsp);
244 /****************************************************************************
245 Write to a file.
246 ****************************************************************************/
248 ssize_t write_file(struct smb_request *req,
249 files_struct *fsp,
250 const char *data,
251 SMB_OFF_T pos,
252 size_t n)
254 write_cache *wcp = fsp->wcp;
255 ssize_t total_written = 0;
256 int write_path = -1;
258 if (fsp->print_file) {
259 uint32 jobid;
261 if (!rap_to_pjobid(fsp->rap_print_jobid, NULL, &jobid)) {
262 DEBUG(3,("write_file: Unable to map RAP jobid %u to jobid.\n",
263 (unsigned int)fsp->rap_print_jobid ));
264 errno = EBADF;
265 return -1;
268 return print_job_write(SNUM(fsp->conn), jobid, data, pos, n);
271 if (!fsp->can_write) {
272 errno = EPERM;
273 return -1;
276 if (!fsp->modified) {
277 SMB_STRUCT_STAT st;
278 fsp->modified = True;
280 if (SMB_VFS_FSTAT(fsp, &st) == 0) {
281 int dosmode;
282 trigger_write_time_update(fsp);
283 dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
284 if ((lp_store_dos_attributes(SNUM(fsp->conn)) ||
285 MAP_ARCHIVE(fsp->conn)) &&
286 !IS_DOS_ARCHIVE(dosmode)) {
287 file_set_dosmode(fsp->conn,fsp->fsp_name,
288 dosmode | aARCH,&st,
289 NULL,
290 false);
294 * If this is the first write and we have an exclusive oplock then setup
295 * the write cache.
298 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && !wcp) {
299 setup_write_cache(fsp, st.st_size);
300 wcp = fsp->wcp;
305 #ifdef WITH_PROFILE
306 DO_PROFILE_INC(writecache_total_writes);
307 if (!fsp->oplock_type) {
308 DO_PROFILE_INC(writecache_non_oplock_writes);
310 #endif
313 * If this file is level II oplocked then we need
314 * to grab the shared memory lock and inform all
315 * other files with a level II lock that they need
316 * to flush their read caches. We keep the lock over
317 * the shared memory area whilst doing this.
320 /* This should actually be improved to span the write. */
321 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
322 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
324 #ifdef WITH_PROFILE
325 if (profile_p && profile_p->writecache_total_writes % 500 == 0) {
326 DEBUG(3,("WRITECACHE: initwrites=%u abutted=%u total=%u \
327 nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
328 profile_p->writecache_init_writes,
329 profile_p->writecache_abutted_writes,
330 profile_p->writecache_total_writes,
331 profile_p->writecache_non_oplock_writes,
332 profile_p->writecache_allocated_write_caches,
333 profile_p->writecache_num_write_caches,
334 profile_p->writecache_direct_writes,
335 profile_p->writecache_num_perfect_writes,
336 profile_p->writecache_read_hits ));
338 DEBUG(3,("WRITECACHE: Flushes SEEK=%d, READ=%d, WRITE=%d, READRAW=%d, OPLOCK=%d, CLOSE=%d, SYNC=%d\n",
339 profile_p->writecache_flushed_writes[SEEK_FLUSH],
340 profile_p->writecache_flushed_writes[READ_FLUSH],
341 profile_p->writecache_flushed_writes[WRITE_FLUSH],
342 profile_p->writecache_flushed_writes[READRAW_FLUSH],
343 profile_p->writecache_flushed_writes[OPLOCK_RELEASE_FLUSH],
344 profile_p->writecache_flushed_writes[CLOSE_FLUSH],
345 profile_p->writecache_flushed_writes[SYNC_FLUSH] ));
347 #endif
349 if (wcp && req->unread_bytes) {
350 /* If we're using receivefile don't
351 * deal with a write cache.
353 flush_write_cache(fsp, WRITE_FLUSH);
354 delete_write_cache(fsp);
355 wcp = NULL;
358 if(!wcp) {
359 DO_PROFILE_INC(writecache_direct_writes);
360 total_written = real_write_file(req, fsp, data, pos, n);
361 return total_written;
364 DEBUG(9,("write_file (%s)(fd=%d pos=%.0f size=%u) wcp->offset=%.0f wcp->data_size=%u\n",
365 fsp->fsp_name, fsp->fh->fd, (double)pos, (unsigned int)n, (double)wcp->offset, (unsigned int)wcp->data_size));
367 fsp->fh->pos = pos + n;
370 * If we have active cache and it isn't contiguous then we flush.
371 * NOTE: There is a small problem with running out of disk ....
374 if (wcp->data_size) {
375 bool cache_flush_needed = False;
377 if ((pos >= wcp->offset) && (pos <= wcp->offset + wcp->data_size)) {
379 /* ASCII art.... JRA.
381 +--------------+-----
382 | Cached data | Rest of allocated cache buffer....
383 +--------------+-----
385 +-------------------+
386 | Data to write |
387 +-------------------+
392 * Start of write overlaps or abutts the existing data.
395 size_t data_used = MIN((wcp->alloc_size - (pos - wcp->offset)), n);
397 memcpy(wcp->data + (pos - wcp->offset), data, data_used);
400 * Update the current buffer size with the new data.
403 if(pos + data_used > wcp->offset + wcp->data_size) {
404 wcp->data_size = pos + data_used - wcp->offset;
408 * Update the file size if changed.
411 if (wcp->offset + wcp->data_size > wcp->file_size) {
412 if (wcp_file_size_change(fsp) == -1) {
413 return -1;
418 * If we used all the data then
419 * return here.
422 if(n == data_used) {
423 return n;
424 } else {
425 cache_flush_needed = True;
428 * Move the start of data forward by the amount used,
429 * cut down the amount left by the same amount.
432 data += data_used;
433 pos += data_used;
434 n -= data_used;
436 DO_PROFILE_INC(writecache_abutted_writes);
437 total_written = data_used;
439 write_path = 1;
441 } else if ((pos < wcp->offset) && (pos + n > wcp->offset) &&
442 (pos + n <= wcp->offset + wcp->alloc_size)) {
444 /* ASCII art.... JRA.
446 +---------------+
447 | Cache buffer |
448 +---------------+
450 +-------------------+
451 | Data to write |
452 +-------------------+
457 * End of write overlaps the existing data.
460 size_t data_used = pos + n - wcp->offset;
462 memcpy(wcp->data, data + n - data_used, data_used);
465 * Update the current buffer size with the new data.
468 if(pos + n > wcp->offset + wcp->data_size) {
469 wcp->data_size = pos + n - wcp->offset;
473 * Update the file size if changed.
476 if (wcp->offset + wcp->data_size > wcp->file_size) {
477 if (wcp_file_size_change(fsp) == -1) {
478 return -1;
483 * We don't need to move the start of data, but we
484 * cut down the amount left by the amount used.
487 n -= data_used;
490 * We cannot have used all the data here.
493 cache_flush_needed = True;
495 DO_PROFILE_INC(writecache_abutted_writes);
496 total_written = data_used;
498 write_path = 2;
500 } else if ( (pos >= wcp->file_size) &&
501 (wcp->offset + wcp->data_size == wcp->file_size) &&
502 (pos > wcp->offset + wcp->data_size) &&
503 (pos < wcp->offset + wcp->alloc_size) ) {
505 /* ASCII art.... JRA.
507 End of file ---->|
509 +---------------+---------------+
510 | Cached data | Cache buffer |
511 +---------------+---------------+
513 +-------------------+
514 | Data to write |
515 +-------------------+
520 * Non-contiguous write part of which fits within
521 * the cache buffer and is extending the file
522 * and the cache contents reflect the current
523 * data up to the current end of the file.
526 size_t data_used;
528 if(pos + n <= wcp->offset + wcp->alloc_size) {
529 data_used = n;
530 } else {
531 data_used = wcp->offset + wcp->alloc_size - pos;
535 * Fill in the non-continuous area with zeros.
538 memset(wcp->data + wcp->data_size, '\0',
539 pos - (wcp->offset + wcp->data_size) );
541 memcpy(wcp->data + (pos - wcp->offset), data, data_used);
544 * Update the current buffer size with the new data.
547 if(pos + data_used > wcp->offset + wcp->data_size) {
548 wcp->data_size = pos + data_used - wcp->offset;
552 * Update the file size if changed.
555 if (wcp->offset + wcp->data_size > wcp->file_size) {
556 if (wcp_file_size_change(fsp) == -1) {
557 return -1;
562 * If we used all the data then
563 * return here.
566 if(n == data_used) {
567 return n;
568 } else {
569 cache_flush_needed = True;
573 * Move the start of data forward by the amount used,
574 * cut down the amount left by the same amount.
577 data += data_used;
578 pos += data_used;
579 n -= data_used;
581 DO_PROFILE_INC(writecache_abutted_writes);
582 total_written = data_used;
584 write_path = 3;
586 } else if ( (pos >= wcp->file_size) &&
587 (n == 1) &&
588 (wcp->file_size == wcp->offset + wcp->data_size) &&
589 (pos < wcp->file_size + wcp->alloc_size)) {
593 End of file ---->|
595 +---------------+---------------+
596 | Cached data | Cache buffer |
597 +---------------+---------------+
599 |<------- allocated size ---------------->|
601 +--------+
602 | 1 Byte |
603 +--------+
605 MS-Office seems to do this a lot to determine if there's enough
606 space on the filesystem to write a new file.
608 Change to :
610 End of file ---->|
611 +-----------------------+--------+
612 | Zeroed Cached data | 1 Byte |
613 +-----------------------+--------+
616 flush_write_cache(fsp, WRITE_FLUSH);
617 wcp->offset = wcp->file_size;
618 wcp->data_size = pos - wcp->file_size + 1;
619 memset(wcp->data, '\0', wcp->data_size);
620 memcpy(wcp->data + wcp->data_size-1, data, 1);
623 * Update the file size if changed.
626 if (wcp->offset + wcp->data_size > wcp->file_size) {
627 if (wcp_file_size_change(fsp) == -1) {
628 return -1;
632 return n;
634 } else {
636 /* ASCII art..... JRA.
638 Case 1).
640 +---------------+---------------+
641 | Cached data | Cache buffer |
642 +---------------+---------------+
644 +-------------------+
645 | Data to write |
646 +-------------------+
648 Case 2).
650 +---------------+---------------+
651 | Cached data | Cache buffer |
652 +---------------+---------------+
654 +-------------------+
655 | Data to write |
656 +-------------------+
658 Case 3).
660 +---------------+---------------+
661 | Cached data | Cache buffer |
662 +---------------+---------------+
664 +-----------------------------------------------------+
665 | Data to write |
666 +-----------------------------------------------------+
671 * Write is bigger than buffer, or there is no overlap on the
672 * low or high ends.
675 DEBUG(9,("write_file: non cacheable write : fd = %d, pos = %.0f, len = %u, current cache pos = %.0f \
676 len = %u\n",fsp->fh->fd, (double)pos, (unsigned int)n, (double)wcp->offset, (unsigned int)wcp->data_size ));
679 * If write would fit in the cache, and is larger than
680 * the data already in the cache, flush the cache and
681 * preferentially copy the data new data into it. Otherwise
682 * just write the data directly.
685 if ( n <= wcp->alloc_size && n > wcp->data_size) {
686 cache_flush_needed = True;
687 } else {
688 ssize_t ret = real_write_file(NULL,fsp, data, pos, n);
691 * If the write overlaps the entire cache, then
692 * discard the current contents of the cache.
693 * Fix from Rasmus Borup Hansen rbh@math.ku.dk.
696 if ((pos <= wcp->offset) &&
697 (pos + n >= wcp->offset + wcp->data_size) ) {
698 DEBUG(9,("write_file: discarding overwritten write \
699 cache: fd = %d, off=%.0f, size=%u\n", fsp->fh->fd, (double)wcp->offset, (unsigned int)wcp->data_size ));
700 wcp->data_size = 0;
703 DO_PROFILE_INC(writecache_direct_writes);
704 if (ret == -1) {
705 return ret;
708 if (pos + ret > wcp->file_size) {
709 wcp->file_size = pos + ret;
712 return ret;
715 write_path = 4;
719 if (cache_flush_needed) {
720 DEBUG(3,("WRITE_FLUSH:%d: due to noncontinuous write: fd = %d, size = %.0f, pos = %.0f, \
721 n = %u, wcp->offset=%.0f, wcp->data_size=%u\n",
722 write_path, fsp->fh->fd, (double)wcp->file_size, (double)pos, (unsigned int)n,
723 (double)wcp->offset, (unsigned int)wcp->data_size ));
725 flush_write_cache(fsp, WRITE_FLUSH);
730 * If the write request is bigger than the cache
731 * size, write it all out.
734 if (n > wcp->alloc_size ) {
735 ssize_t ret = real_write_file(NULL,fsp, data, pos, n);
736 if (ret == -1) {
737 return -1;
740 if (pos + ret > wcp->file_size) {
741 wcp->file_size = pos + n;
744 DO_PROFILE_INC(writecache_direct_writes);
745 return total_written + n;
749 * If there's any data left, cache it.
752 if (n) {
753 #ifdef WITH_PROFILE
754 if (wcp->data_size) {
755 DO_PROFILE_INC(writecache_abutted_writes);
756 } else {
757 DO_PROFILE_INC(writecache_init_writes);
759 #endif
760 memcpy(wcp->data+wcp->data_size, data, n);
761 if (wcp->data_size == 0) {
762 wcp->offset = pos;
763 DO_PROFILE_INC(writecache_num_write_caches);
765 wcp->data_size += n;
768 * Update the file size if changed.
771 if (wcp->offset + wcp->data_size > wcp->file_size) {
772 if (wcp_file_size_change(fsp) == -1) {
773 return -1;
776 DEBUG(9,("wcp->offset = %.0f wcp->data_size = %u cache return %u\n",
777 (double)wcp->offset, (unsigned int)wcp->data_size, (unsigned int)n));
779 total_written += n;
780 return total_written; /* .... that's a write :) */
783 return total_written;
786 /****************************************************************************
787 Delete the write cache structure.
788 ****************************************************************************/
790 void delete_write_cache(files_struct *fsp)
792 write_cache *wcp;
794 if(!fsp) {
795 return;
798 if(!(wcp = fsp->wcp)) {
799 return;
802 DO_PROFILE_DEC(writecache_allocated_write_caches);
803 allocated_write_caches--;
805 SMB_ASSERT(wcp->data_size == 0);
807 SAFE_FREE(wcp->data);
808 SAFE_FREE(fsp->wcp);
810 DEBUG(10,("delete_write_cache: File %s deleted write cache\n", fsp->fsp_name ));
813 /****************************************************************************
814 Setup the write cache structure.
815 ****************************************************************************/
817 static bool setup_write_cache(files_struct *fsp, SMB_OFF_T file_size)
819 ssize_t alloc_size = lp_write_cache_size(SNUM(fsp->conn));
820 write_cache *wcp;
822 if (allocated_write_caches >= MAX_WRITE_CACHES) {
823 return False;
826 if(alloc_size == 0 || fsp->wcp) {
827 return False;
830 if((wcp = SMB_MALLOC_P(write_cache)) == NULL) {
831 DEBUG(0,("setup_write_cache: malloc fail.\n"));
832 return False;
835 wcp->file_size = file_size;
836 wcp->offset = 0;
837 wcp->alloc_size = alloc_size;
838 wcp->data_size = 0;
839 if((wcp->data = (char *)SMB_MALLOC(wcp->alloc_size)) == NULL) {
840 DEBUG(0,("setup_write_cache: malloc fail for buffer size %u.\n",
841 (unsigned int)wcp->alloc_size ));
842 SAFE_FREE(wcp);
843 return False;
846 memset(wcp->data, '\0', wcp->alloc_size );
848 fsp->wcp = wcp;
849 DO_PROFILE_INC(writecache_allocated_write_caches);
850 allocated_write_caches++;
852 DEBUG(10,("setup_write_cache: File %s allocated write cache size %lu\n",
853 fsp->fsp_name, (unsigned long)wcp->alloc_size ));
855 return True;
858 /****************************************************************************
859 Cope with a size change.
860 ****************************************************************************/
862 void set_filelen_write_cache(files_struct *fsp, SMB_OFF_T file_size)
864 if(fsp->wcp) {
865 /* The cache *must* have been flushed before we do this. */
866 if (fsp->wcp->data_size != 0) {
867 char *msg;
868 if (asprintf(&msg, "set_filelen_write_cache: size change "
869 "on file %s with write cache size = %lu\n",
870 fsp->fsp_name,
871 (unsigned long)fsp->wcp->data_size) != -1) {
872 smb_panic(msg);
873 } else {
874 smb_panic("set_filelen_write_cache");
877 fsp->wcp->file_size = file_size;
881 /*******************************************************************
882 Flush a write cache struct to disk.
883 ********************************************************************/
885 ssize_t flush_write_cache(files_struct *fsp, enum flush_reason_enum reason)
887 write_cache *wcp = fsp->wcp;
888 size_t data_size;
889 ssize_t ret;
891 if(!wcp || !wcp->data_size) {
892 return 0;
895 data_size = wcp->data_size;
896 wcp->data_size = 0;
898 DO_PROFILE_DEC_INC(writecache_num_write_caches,writecache_flushed_writes[reason]);
900 DEBUG(9,("flushing write cache: fd = %d, off=%.0f, size=%u\n",
901 fsp->fh->fd, (double)wcp->offset, (unsigned int)data_size));
903 #ifdef WITH_PROFILE
904 if(data_size == wcp->alloc_size) {
905 DO_PROFILE_INC(writecache_num_perfect_writes);
907 #endif
909 ret = real_write_file(NULL, fsp, wcp->data, wcp->offset, data_size);
912 * Ensure file size if kept up to date if write extends file.
915 if ((ret != -1) && (wcp->offset + ret > wcp->file_size)) {
916 wcp->file_size = wcp->offset + ret;
919 return ret;
922 /*******************************************************************
923 sync a file
924 ********************************************************************/
926 NTSTATUS sync_file(connection_struct *conn, files_struct *fsp, bool write_through)
928 if (fsp->fh->fd == -1)
929 return NT_STATUS_INVALID_HANDLE;
931 if (lp_strict_sync(SNUM(conn)) &&
932 (lp_syncalways(SNUM(conn)) || write_through)) {
933 int ret = flush_write_cache(fsp, SYNC_FLUSH);
934 if (ret == -1) {
935 return map_nt_error_from_unix(errno);
937 ret = SMB_VFS_FSYNC(fsp);
938 if (ret == -1) {
939 return map_nt_error_from_unix(errno);
942 return NT_STATUS_OK;
945 /************************************************************
946 Perform a stat whether a valid fd or not.
947 ************************************************************/
949 int fsp_stat(files_struct *fsp, SMB_STRUCT_STAT *pst)
951 if (fsp->fh->fd == -1) {
952 return SMB_VFS_STAT(fsp->conn, fsp->fsp_name, pst);
953 } else {
954 return SMB_VFS_FSTAT(fsp, pst);