2 Unix SMB/Netbios implementation.
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/>.
24 #include "smbd/smbd.h"
25 #include "smbd/globals.h"
27 static bool setup_write_cache(files_struct
*, SMB_OFF_T
);
29 /****************************************************************************
30 Read from write cache if we can.
31 ****************************************************************************/
33 static bool read_from_write_cache(files_struct
*fsp
,char *data
,SMB_OFF_T pos
,size_t n
)
35 write_cache
*wcp
= fsp
->wcp
;
41 if( n
> wcp
->data_size
|| pos
< wcp
->offset
|| pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
45 memcpy(data
, wcp
->data
+ (pos
- wcp
->offset
), n
);
47 DO_PROFILE_INC(writecache_read_hits
);
52 /****************************************************************************
54 ****************************************************************************/
56 ssize_t
read_file(files_struct
*fsp
,char *data
,SMB_OFF_T pos
,size_t n
)
58 ssize_t ret
=0,readret
;
60 /* you can't read from print files */
61 if (fsp
->print_file
) {
67 * Serve from write cache if we can.
70 if(read_from_write_cache(fsp
, data
, pos
, n
)) {
71 fsp
->fh
->pos
= pos
+ n
;
72 fsp
->fh
->position_information
= fsp
->fh
->pos
;
76 flush_write_cache(fsp
, READ_FLUSH
);
84 readret
= SMB_VFS_PREAD(fsp
,data
,n
,pos
);
87 if ((errno
== EAGAIN
) && numretries
) {
88 DEBUG(3,("read_file EAGAIN retry in 10 seconds\n"));
95 #else /* NO DMF fix. */
96 readret
= SMB_VFS_PREAD(fsp
,data
,n
,pos
);
107 DEBUG(10,("read_file (%s): pos = %.0f, size = %lu, returned %lu\n",
108 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
111 fsp
->fh
->position_information
= fsp
->fh
->pos
;
116 /****************************************************************************
117 *Really* write to a file.
118 ****************************************************************************/
120 static ssize_t
real_write_file(struct smb_request
*req
,
129 ret
= vfs_write_data(req
, fsp
, data
, n
);
132 if (pos
&& lp_strict_allocate(SNUM(fsp
->conn
) &&
134 if (vfs_fill_sparse(fsp
, pos
) == -1) {
138 ret
= vfs_pwrite_data(req
, fsp
, data
, n
, pos
);
141 DEBUG(10,("real_write_file (%s): pos = %.0f, size = %lu, returned %ld\n",
142 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
147 /* Yes - this is correct - writes don't update this. JRA. */
148 /* Found by Samba4 tests. */
150 fsp
->position_information
= fsp
->pos
;
157 /****************************************************************************
158 File size cache change.
159 Updates size on disk but doesn't flush the cache.
160 ****************************************************************************/
162 static int wcp_file_size_change(files_struct
*fsp
)
165 write_cache
*wcp
= fsp
->wcp
;
167 wcp
->file_size
= wcp
->offset
+ wcp
->data_size
;
168 ret
= SMB_VFS_FTRUNCATE(fsp
, wcp
->file_size
);
170 DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f "
171 "error %s\n", fsp_str_dbg(fsp
),
172 (double)wcp
->file_size
, strerror(errno
)));
177 void update_write_time_handler(struct event_context
*ctx
,
178 struct timed_event
*te
,
182 files_struct
*fsp
= (files_struct
*)private_data
;
184 DEBUG(5, ("Update write time on %s\n", fsp_str_dbg(fsp
)));
186 /* change the write time in the open file db. */
187 (void)set_write_time(fsp
->file_id
, timespec_current());
190 notify_fname(fsp
->conn
, NOTIFY_ACTION_MODIFIED
,
191 FILE_NOTIFY_CHANGE_LAST_WRITE
, fsp
->fsp_name
->base_name
);
193 /* Remove the timed event handler. */
194 TALLOC_FREE(fsp
->update_write_time_event
);
197 /*********************************************************
198 Schedule a write time update for WRITE_TIME_UPDATE_USEC_DELAY
200 *********************************************************/
202 void trigger_write_time_update(struct files_struct
*fsp
)
206 if (fsp
->posix_open
) {
207 /* Don't use delayed writes on POSIX files. */
211 if (fsp
->write_time_forced
) {
212 /* No point - "sticky" write times
218 /* We need to remember someone did a write
219 * and update to current time on close. */
221 fsp
->update_write_time_on_close
= true;
223 if (fsp
->update_write_time_triggered
) {
225 * We only update the write time after 2 seconds
226 * on the first normal write. After that
227 * no other writes affect this until close.
231 fsp
->update_write_time_triggered
= true;
233 delay
= lp_parm_int(SNUM(fsp
->conn
),
234 "smbd", "writetimeupdatedelay",
235 WRITE_TIME_UPDATE_USEC_DELAY
);
237 DEBUG(5, ("Update write time %d usec later on %s\n",
238 delay
, fsp_str_dbg(fsp
)));
240 /* trigger the update 2 seconds later */
241 fsp
->update_write_time_event
=
242 event_add_timed(smbd_event_context(), NULL
,
243 timeval_current_ofs(0, delay
),
244 update_write_time_handler
, fsp
);
247 void trigger_write_time_update_immediate(struct files_struct
*fsp
)
249 struct smb_file_time ft
;
251 if (fsp
->posix_open
) {
252 /* Don't use delayed writes on POSIX files. */
256 if (fsp
->write_time_forced
) {
258 * No point - "sticky" write times
264 TALLOC_FREE(fsp
->update_write_time_event
);
265 DEBUG(5, ("Update write time immediate on %s\n",
268 /* After an immediate update, reset the trigger. */
269 fsp
->update_write_time_triggered
= true;
270 fsp
->update_write_time_on_close
= false;
273 ft
.mtime
= timespec_current();
275 /* Update the time in the open file db. */
276 (void)set_write_time(fsp
->file_id
, ft
.mtime
);
278 /* Now set on disk - takes care of notify. */
279 (void)smb_set_file_time(fsp
->conn
, fsp
, fsp
->fsp_name
, &ft
, false);
282 /****************************************************************************
284 ****************************************************************************/
286 ssize_t
write_file(struct smb_request
*req
,
292 write_cache
*wcp
= fsp
->wcp
;
293 ssize_t total_written
= 0;
296 if (fsp
->print_file
) {
300 ret
= print_spool_write(fsp
, data
, n
, pos
, &t
);
308 if (!fsp
->can_write
) {
313 if (!fsp
->modified
) {
314 fsp
->modified
= True
;
316 if (SMB_VFS_FSTAT(fsp
, &fsp
->fsp_name
->st
) == 0) {
317 trigger_write_time_update(fsp
);
318 if (!fsp
->posix_open
&&
319 (lp_store_dos_attributes(SNUM(fsp
->conn
)) ||
320 MAP_ARCHIVE(fsp
->conn
))) {
321 int dosmode
= dos_mode(fsp
->conn
, fsp
->fsp_name
);
322 if (!IS_DOS_ARCHIVE(dosmode
)) {
323 file_set_dosmode(fsp
->conn
, fsp
->fsp_name
,
324 dosmode
| aARCH
, NULL
, false);
329 * If this is the first write and we have an exclusive oplock then setup
333 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
) && !wcp
) {
334 setup_write_cache(fsp
,
335 fsp
->fsp_name
->st
.st_ex_size
);
342 DO_PROFILE_INC(writecache_total_writes
);
343 if (!fsp
->oplock_type
) {
344 DO_PROFILE_INC(writecache_non_oplock_writes
);
349 * If this file is level II oplocked then we need
350 * to grab the shared memory lock and inform all
351 * other files with a level II lock that they need
352 * to flush their read caches. We keep the lock over
353 * the shared memory area whilst doing this.
356 /* This should actually be improved to span the write. */
357 contend_level2_oplocks_begin(fsp
, LEVEL2_CONTEND_WRITE
);
358 contend_level2_oplocks_end(fsp
, LEVEL2_CONTEND_WRITE
);
361 if (profile_p
&& profile_p
->writecache_total_writes
% 500 == 0) {
362 DEBUG(3,("WRITECACHE: initwrites=%u abutted=%u total=%u \
363 nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
364 profile_p
->writecache_init_writes
,
365 profile_p
->writecache_abutted_writes
,
366 profile_p
->writecache_total_writes
,
367 profile_p
->writecache_non_oplock_writes
,
368 profile_p
->writecache_allocated_write_caches
,
369 profile_p
->writecache_num_write_caches
,
370 profile_p
->writecache_direct_writes
,
371 profile_p
->writecache_num_perfect_writes
,
372 profile_p
->writecache_read_hits
));
374 DEBUG(3,("WRITECACHE: Flushes SEEK=%d, READ=%d, WRITE=%d, READRAW=%d, OPLOCK=%d, CLOSE=%d, SYNC=%d\n",
375 profile_p
->writecache_flushed_writes
[SEEK_FLUSH
],
376 profile_p
->writecache_flushed_writes
[READ_FLUSH
],
377 profile_p
->writecache_flushed_writes
[WRITE_FLUSH
],
378 profile_p
->writecache_flushed_writes
[READRAW_FLUSH
],
379 profile_p
->writecache_flushed_writes
[OPLOCK_RELEASE_FLUSH
],
380 profile_p
->writecache_flushed_writes
[CLOSE_FLUSH
],
381 profile_p
->writecache_flushed_writes
[SYNC_FLUSH
] ));
385 if (wcp
&& req
->unread_bytes
) {
386 /* If we're using receivefile don't
387 * deal with a write cache.
389 flush_write_cache(fsp
, WRITE_FLUSH
);
390 delete_write_cache(fsp
);
395 DO_PROFILE_INC(writecache_direct_writes
);
396 total_written
= real_write_file(req
, fsp
, data
, pos
, n
);
397 return total_written
;
400 DEBUG(9,("write_file (%s)(fd=%d pos=%.0f size=%u) wcp->offset=%.0f "
401 "wcp->data_size=%u\n", fsp_str_dbg(fsp
), fsp
->fh
->fd
,
402 (double)pos
, (unsigned int)n
, (double)wcp
->offset
,
403 (unsigned int)wcp
->data_size
));
405 fsp
->fh
->pos
= pos
+ n
;
407 if ((n
== 1) && (data
[0] == '\0') && (pos
> wcp
->file_size
)) {
411 * This is a 1-byte write of a 0 beyond the EOF and
412 * thus implicitly also beyond the current active
413 * write cache, the typical file-extending (and
414 * allocating, but we're using the write cache here)
415 * write done by Windows. We just have to ftruncate
416 * the file and rely on posix semantics to return
417 * zeros for non-written file data that is within the
420 * We can not use wcp_file_size_change here because we
421 * might have an existing write cache, and
422 * wcp_file_size_change assumes a change to just the
423 * end of the current write cache.
426 wcp
->file_size
= pos
+ 1;
427 ret
= SMB_VFS_FTRUNCATE(fsp
, wcp
->file_size
);
429 DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f"
430 "error %s\n", fsp_str_dbg(fsp
),
431 (double)wcp
->file_size
, strerror(errno
)));
439 * If we have active cache and it isn't contiguous then we flush.
440 * NOTE: There is a small problem with running out of disk ....
443 if (wcp
->data_size
) {
444 bool cache_flush_needed
= False
;
446 if ((pos
>= wcp
->offset
) && (pos
<= wcp
->offset
+ wcp
->data_size
)) {
448 /* ASCII art.... JRA.
450 +--------------+-----
451 | Cached data | Rest of allocated cache buffer....
452 +--------------+-----
454 +-------------------+
456 +-------------------+
461 * Start of write overlaps or abutts the existing data.
464 size_t data_used
= MIN((wcp
->alloc_size
- (pos
- wcp
->offset
)), n
);
466 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
, data_used
);
469 * Update the current buffer size with the new data.
472 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
473 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
477 * Update the file size if changed.
480 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
481 if (wcp_file_size_change(fsp
) == -1) {
487 * If we used all the data then
494 cache_flush_needed
= True
;
497 * Move the start of data forward by the amount used,
498 * cut down the amount left by the same amount.
505 DO_PROFILE_INC(writecache_abutted_writes
);
506 total_written
= data_used
;
510 } else if ((pos
< wcp
->offset
) && (pos
+ n
> wcp
->offset
) &&
511 (pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
)) {
513 /* ASCII art.... JRA.
519 +-------------------+
521 +-------------------+
526 * End of write overlaps the existing data.
529 size_t data_used
= pos
+ n
- wcp
->offset
;
531 memcpy(wcp
->data
, data
+ n
- data_used
, data_used
);
534 * Update the current buffer size with the new data.
537 if(pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
538 wcp
->data_size
= pos
+ n
- wcp
->offset
;
542 * Update the file size if changed.
545 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
546 if (wcp_file_size_change(fsp
) == -1) {
552 * We don't need to move the start of data, but we
553 * cut down the amount left by the amount used.
559 * We cannot have used all the data here.
562 cache_flush_needed
= True
;
564 DO_PROFILE_INC(writecache_abutted_writes
);
565 total_written
= data_used
;
569 } else if ( (pos
>= wcp
->file_size
) &&
570 (wcp
->offset
+ wcp
->data_size
== wcp
->file_size
) &&
571 (pos
> wcp
->offset
+ wcp
->data_size
) &&
572 (pos
< wcp
->offset
+ wcp
->alloc_size
) ) {
574 /* ASCII art.... JRA.
578 +---------------+---------------+
579 | Cached data | Cache buffer |
580 +---------------+---------------+
582 +-------------------+
584 +-------------------+
589 * Non-contiguous write part of which fits within
590 * the cache buffer and is extending the file
591 * and the cache contents reflect the current
592 * data up to the current end of the file.
597 if(pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
) {
600 data_used
= wcp
->offset
+ wcp
->alloc_size
- pos
;
604 * Fill in the non-continuous area with zeros.
607 memset(wcp
->data
+ wcp
->data_size
, '\0',
608 pos
- (wcp
->offset
+ wcp
->data_size
) );
610 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
, data_used
);
613 * Update the current buffer size with the new data.
616 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
617 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
621 * Update the file size if changed.
624 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
625 if (wcp_file_size_change(fsp
) == -1) {
631 * If we used all the data then
638 cache_flush_needed
= True
;
642 * Move the start of data forward by the amount used,
643 * cut down the amount left by the same amount.
650 DO_PROFILE_INC(writecache_abutted_writes
);
651 total_written
= data_used
;
655 } else if ( (pos
>= wcp
->file_size
) &&
657 (wcp
->file_size
== wcp
->offset
+ wcp
->data_size
) &&
658 (pos
< wcp
->file_size
+ wcp
->alloc_size
)) {
664 +---------------+---------------+
665 | Cached data | Cache buffer |
666 +---------------+---------------+
668 |<------- allocated size ---------------->|
674 MS-Office seems to do this a lot to determine if there's enough
675 space on the filesystem to write a new file.
680 +-----------------------+--------+
681 | Zeroed Cached data | 1 Byte |
682 +-----------------------+--------+
685 flush_write_cache(fsp
, WRITE_FLUSH
);
686 wcp
->offset
= wcp
->file_size
;
687 wcp
->data_size
= pos
- wcp
->file_size
+ 1;
688 memset(wcp
->data
, '\0', wcp
->data_size
);
689 memcpy(wcp
->data
+ wcp
->data_size
-1, data
, 1);
692 * Update the file size if changed.
695 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
696 if (wcp_file_size_change(fsp
) == -1) {
705 /* ASCII art..... JRA.
709 +---------------+---------------+
710 | Cached data | Cache buffer |
711 +---------------+---------------+
713 +-------------------+
715 +-------------------+
719 +---------------+---------------+
720 | Cached data | Cache buffer |
721 +---------------+---------------+
723 +-------------------+
725 +-------------------+
729 +---------------+---------------+
730 | Cached data | Cache buffer |
731 +---------------+---------------+
733 +-----------------------------------------------------+
735 +-----------------------------------------------------+
740 * Write is bigger than buffer, or there is no overlap on the
744 DEBUG(9,("write_file: non cacheable write : fd = %d, pos = %.0f, len = %u, current cache pos = %.0f \
745 len = %u\n",fsp
->fh
->fd
, (double)pos
, (unsigned int)n
, (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
748 * If write would fit in the cache, and is larger than
749 * the data already in the cache, flush the cache and
750 * preferentially copy the data new data into it. Otherwise
751 * just write the data directly.
754 if ( n
<= wcp
->alloc_size
&& n
> wcp
->data_size
) {
755 cache_flush_needed
= True
;
757 ssize_t ret
= real_write_file(NULL
,fsp
, data
, pos
, n
);
760 * If the write overlaps the entire cache, then
761 * discard the current contents of the cache.
762 * Fix from Rasmus Borup Hansen rbh@math.ku.dk.
765 if ((pos
<= wcp
->offset
) &&
766 (pos
+ n
>= wcp
->offset
+ wcp
->data_size
) ) {
767 DEBUG(9,("write_file: discarding overwritten write \
768 cache: fd = %d, off=%.0f, size=%u\n", fsp
->fh
->fd
, (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
772 DO_PROFILE_INC(writecache_direct_writes
);
777 if (pos
+ ret
> wcp
->file_size
) {
778 wcp
->file_size
= pos
+ ret
;
788 if (cache_flush_needed
) {
789 DEBUG(3,("WRITE_FLUSH:%d: due to noncontinuous write: fd = %d, size = %.0f, pos = %.0f, \
790 n = %u, wcp->offset=%.0f, wcp->data_size=%u\n",
791 write_path
, fsp
->fh
->fd
, (double)wcp
->file_size
, (double)pos
, (unsigned int)n
,
792 (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
794 flush_write_cache(fsp
, WRITE_FLUSH
);
799 * If the write request is bigger than the cache
800 * size, write it all out.
803 if (n
> wcp
->alloc_size
) {
804 ssize_t ret
= real_write_file(NULL
,fsp
, data
, pos
, n
);
809 if (pos
+ ret
> wcp
->file_size
) {
810 wcp
->file_size
= pos
+ n
;
813 DO_PROFILE_INC(writecache_direct_writes
);
814 return total_written
+ n
;
818 * If there's any data left, cache it.
823 if (wcp
->data_size
) {
824 DO_PROFILE_INC(writecache_abutted_writes
);
826 DO_PROFILE_INC(writecache_init_writes
);
830 if ((wcp
->data_size
== 0)
831 && (pos
> wcp
->file_size
)
832 && (pos
+ n
<= wcp
->file_size
+ wcp
->alloc_size
)) {
834 * This is a write completely beyond the
835 * current EOF, but within reach of the write
836 * cache. We expect fill-up writes pretty
837 * soon, so it does not make sense to start
838 * the write cache at the current
839 * offset. These fill-up writes would trigger
840 * separate pwrites or even unnecessary cache
841 * flushes because they overlap if this is a
842 * one-byte allocating write.
844 wcp
->offset
= wcp
->file_size
;
845 wcp
->data_size
= pos
- wcp
->file_size
;
846 memset(wcp
->data
, 0, wcp
->data_size
);
849 memcpy(wcp
->data
+wcp
->data_size
, data
, n
);
850 if (wcp
->data_size
== 0) {
852 DO_PROFILE_INC(writecache_num_write_caches
);
857 * Update the file size if changed.
860 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
861 if (wcp_file_size_change(fsp
) == -1) {
865 DEBUG(9,("wcp->offset = %.0f wcp->data_size = %u cache return %u\n",
866 (double)wcp
->offset
, (unsigned int)wcp
->data_size
, (unsigned int)n
));
869 return total_written
; /* .... that's a write :) */
872 return total_written
;
875 /****************************************************************************
876 Delete the write cache structure.
877 ****************************************************************************/
879 void delete_write_cache(files_struct
*fsp
)
887 if(!(wcp
= fsp
->wcp
)) {
891 DO_PROFILE_DEC(writecache_allocated_write_caches
);
892 allocated_write_caches
--;
894 SMB_ASSERT(wcp
->data_size
== 0);
896 SAFE_FREE(wcp
->data
);
899 DEBUG(10,("delete_write_cache: File %s deleted write cache\n",
903 /****************************************************************************
904 Setup the write cache structure.
905 ****************************************************************************/
907 static bool setup_write_cache(files_struct
*fsp
, SMB_OFF_T file_size
)
909 ssize_t alloc_size
= lp_write_cache_size(SNUM(fsp
->conn
));
912 if (allocated_write_caches
>= MAX_WRITE_CACHES
) {
916 if(alloc_size
== 0 || fsp
->wcp
) {
920 if((wcp
= SMB_MALLOC_P(write_cache
)) == NULL
) {
921 DEBUG(0,("setup_write_cache: malloc fail.\n"));
925 wcp
->file_size
= file_size
;
927 wcp
->alloc_size
= alloc_size
;
929 if((wcp
->data
= (char *)SMB_MALLOC(wcp
->alloc_size
)) == NULL
) {
930 DEBUG(0,("setup_write_cache: malloc fail for buffer size %u.\n",
931 (unsigned int)wcp
->alloc_size
));
936 memset(wcp
->data
, '\0', wcp
->alloc_size
);
939 DO_PROFILE_INC(writecache_allocated_write_caches
);
940 allocated_write_caches
++;
942 DEBUG(10,("setup_write_cache: File %s allocated write cache size %lu\n",
943 fsp_str_dbg(fsp
), (unsigned long)wcp
->alloc_size
));
948 /****************************************************************************
949 Cope with a size change.
950 ****************************************************************************/
952 void set_filelen_write_cache(files_struct
*fsp
, SMB_OFF_T file_size
)
955 /* The cache *must* have been flushed before we do this. */
956 if (fsp
->wcp
->data_size
!= 0) {
958 if (asprintf(&msg
, "set_filelen_write_cache: size change "
959 "on file %s with write cache size = %lu\n",
960 fsp
->fsp_name
->base_name
,
961 (unsigned long)fsp
->wcp
->data_size
) != -1) {
964 smb_panic("set_filelen_write_cache");
967 fsp
->wcp
->file_size
= file_size
;
971 /*******************************************************************
972 Flush a write cache struct to disk.
973 ********************************************************************/
975 ssize_t
flush_write_cache(files_struct
*fsp
, enum flush_reason_enum reason
)
977 write_cache
*wcp
= fsp
->wcp
;
981 if(!wcp
|| !wcp
->data_size
) {
985 data_size
= wcp
->data_size
;
988 DO_PROFILE_DEC_INC(writecache_num_write_caches
,writecache_flushed_writes
[reason
]);
990 DEBUG(9,("flushing write cache: fd = %d, off=%.0f, size=%u\n",
991 fsp
->fh
->fd
, (double)wcp
->offset
, (unsigned int)data_size
));
994 if(data_size
== wcp
->alloc_size
) {
995 DO_PROFILE_INC(writecache_num_perfect_writes
);
999 ret
= real_write_file(NULL
, fsp
, wcp
->data
, wcp
->offset
, data_size
);
1002 * Ensure file size if kept up to date if write extends file.
1005 if ((ret
!= -1) && (wcp
->offset
+ ret
> wcp
->file_size
)) {
1006 wcp
->file_size
= wcp
->offset
+ ret
;
1012 /*******************************************************************
1014 ********************************************************************/
1016 NTSTATUS
sync_file(connection_struct
*conn
, files_struct
*fsp
, bool write_through
)
1018 if (fsp
->fh
->fd
== -1)
1019 return NT_STATUS_INVALID_HANDLE
;
1021 if (lp_strict_sync(SNUM(conn
)) &&
1022 (lp_syncalways(SNUM(conn
)) || write_through
)) {
1023 int ret
= flush_write_cache(fsp
, SYNC_FLUSH
);
1025 return map_nt_error_from_unix(errno
);
1027 ret
= SMB_VFS_FSYNC(fsp
);
1029 return map_nt_error_from_unix(errno
);
1032 return NT_STATUS_OK
;
1035 /************************************************************
1036 Perform a stat whether a valid fd or not.
1037 ************************************************************/
1039 int fsp_stat(files_struct
*fsp
)
1041 if (fsp
->fh
->fd
== -1) {
1042 if (fsp
->posix_open
) {
1043 return SMB_VFS_LSTAT(fsp
->conn
, fsp
->fsp_name
);
1045 return SMB_VFS_STAT(fsp
->conn
, fsp
->fsp_name
);
1048 return SMB_VFS_FSTAT(fsp
, &fsp
->fsp_name
->st
);