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"
26 #include "smbprofile.h"
36 static bool setup_write_cache(files_struct
*, off_t
);
38 /****************************************************************************
39 Read from write cache if we can.
40 ****************************************************************************/
42 static bool read_from_write_cache(files_struct
*fsp
,char *data
,off_t pos
,size_t n
)
44 struct write_cache
*wcp
= fsp
->wcp
;
50 if( n
> wcp
->data_size
|| pos
< wcp
->offset
|| pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
54 memcpy(data
, wcp
->data
+ (pos
- wcp
->offset
), n
);
56 DO_PROFILE_INC(writecache_cached_reads
);
61 /****************************************************************************
63 ****************************************************************************/
65 ssize_t
read_file(files_struct
*fsp
,char *data
,off_t pos
,size_t n
)
69 /* you can't read from print files */
70 if (fsp
->print_file
) {
76 * Serve from write cache if we can.
79 if(read_from_write_cache(fsp
, data
, pos
, n
)) {
80 fsp
->fh
->pos
= pos
+ n
;
81 fsp
->fh
->position_information
= fsp
->fh
->pos
;
85 flush_write_cache(fsp
, SAMBA_READ_FLUSH
);
90 ret
= SMB_VFS_PREAD(fsp
,data
,n
,pos
);
97 DEBUG(10,("read_file (%s): pos = %.0f, size = %lu, returned %lu\n",
98 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
101 fsp
->fh
->position_information
= fsp
->fh
->pos
;
106 /****************************************************************************
107 *Really* write to a file.
108 ****************************************************************************/
110 static ssize_t
real_write_file(struct smb_request
*req
,
119 if (pos
&& lp_strict_allocate(SNUM(fsp
->conn
) &&
121 if (vfs_fill_sparse(fsp
, pos
) == -1) {
125 ret
= vfs_pwrite_data(req
, fsp
, data
, n
, pos
);
127 DEBUG(10,("real_write_file (%s): pos = %.0f, size = %lu, returned %ld\n",
128 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
133 /* Yes - this is correct - writes don't update this. JRA. */
134 /* Found by Samba4 tests. */
136 fsp
->position_information
= fsp
->pos
;
143 /****************************************************************************
144 File size cache change.
145 Updates size on disk but doesn't flush the cache.
146 ****************************************************************************/
148 static int wcp_file_size_change(files_struct
*fsp
)
151 struct write_cache
*wcp
= fsp
->wcp
;
153 wcp
->file_size
= wcp
->offset
+ wcp
->data_size
;
154 ret
= SMB_VFS_FTRUNCATE(fsp
, wcp
->file_size
);
156 DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f "
157 "error %s\n", fsp_str_dbg(fsp
),
158 (double)wcp
->file_size
, strerror(errno
)));
163 void fsp_flush_write_time_update(struct files_struct
*fsp
)
166 * Note this won't expect any impersonation!
167 * So don't call any SMB_VFS operations here!
170 DEBUG(5, ("Update write time on %s\n", fsp_str_dbg(fsp
)));
172 /* change the write time in the open file db. */
173 (void)set_write_time(fsp
->file_id
, timespec_current());
176 notify_fname(fsp
->conn
, NOTIFY_ACTION_MODIFIED
,
177 FILE_NOTIFY_CHANGE_LAST_WRITE
, fsp
->fsp_name
->base_name
);
179 /* Remove the timed event handler. */
180 TALLOC_FREE(fsp
->update_write_time_event
);
183 static void update_write_time_handler(struct tevent_context
*ctx
,
184 struct tevent_timer
*te
,
188 files_struct
*fsp
= (files_struct
*)private_data
;
189 fsp_flush_write_time_update(fsp
);
192 /*********************************************************
193 Schedule a write time update for WRITE_TIME_UPDATE_USEC_DELAY
195 *********************************************************/
197 void trigger_write_time_update(struct files_struct
*fsp
)
201 if (fsp
->posix_flags
& FSP_POSIX_FLAGS_OPEN
) {
202 /* Don't use delayed writes on POSIX files. */
206 if (fsp
->write_time_forced
) {
207 /* No point - "sticky" write times
213 /* We need to remember someone did a write
214 * and update to current time on close. */
216 fsp
->update_write_time_on_close
= true;
218 if (fsp
->update_write_time_triggered
) {
220 * We only update the write time after 2 seconds
221 * on the first normal write. After that
222 * no other writes affect this until close.
226 fsp
->update_write_time_triggered
= true;
228 delay
= lp_parm_int(SNUM(fsp
->conn
),
229 "smbd", "writetimeupdatedelay",
230 WRITE_TIME_UPDATE_USEC_DELAY
);
232 DEBUG(5, ("Update write time %d usec later on %s\n",
233 delay
, fsp_str_dbg(fsp
)));
235 /* trigger the update 2 seconds later */
236 fsp
->update_write_time_event
=
237 tevent_add_timer(fsp
->conn
->sconn
->ev_ctx
, NULL
,
238 timeval_current_ofs_usec(delay
),
239 update_write_time_handler
, fsp
);
242 void trigger_write_time_update_immediate(struct files_struct
*fsp
)
244 struct smb_file_time ft
;
246 if (fsp
->posix_flags
& FSP_POSIX_FLAGS_OPEN
) {
247 /* Don't use delayed writes on POSIX files. */
251 if (fsp
->write_time_forced
) {
253 * No point - "sticky" write times
259 TALLOC_FREE(fsp
->update_write_time_event
);
260 DEBUG(5, ("Update write time immediate on %s\n",
263 /* After an immediate update, reset the trigger. */
264 fsp
->update_write_time_triggered
= true;
265 fsp
->update_write_time_on_close
= false;
267 ft
= (struct smb_file_time
) { .mtime
= timespec_current() };
269 /* Update the time in the open file db. */
270 (void)set_write_time(fsp
->file_id
, ft
.mtime
);
272 /* Now set on disk - takes care of notify. */
273 (void)smb_set_file_time(fsp
->conn
, fsp
, fsp
->fsp_name
, &ft
, false);
276 void mark_file_modified(files_struct
*fsp
)
284 fsp
->modified
= true;
286 if (SMB_VFS_FSTAT(fsp
, &fsp
->fsp_name
->st
) != 0) {
289 trigger_write_time_update(fsp
);
291 if (fsp
->posix_flags
& FSP_POSIX_FLAGS_OPEN
) {
294 if (!(lp_store_dos_attributes(SNUM(fsp
->conn
)) ||
295 MAP_ARCHIVE(fsp
->conn
))) {
299 dosmode
= dos_mode(fsp
->conn
, fsp
->fsp_name
);
300 if (IS_DOS_ARCHIVE(dosmode
)) {
303 file_set_dosmode(fsp
->conn
, fsp
->fsp_name
,
304 dosmode
| FILE_ATTRIBUTE_ARCHIVE
, NULL
, false);
307 /****************************************************************************
309 ****************************************************************************/
311 ssize_t
write_file(struct smb_request
*req
,
317 struct write_cache
*wcp
= fsp
->wcp
;
318 ssize_t total_written
= 0;
321 if (fsp
->print_file
) {
325 ret
= print_spool_write(fsp
, data
, n
, pos
, &t
);
333 if (!fsp
->can_write
) {
339 * If this is the first write and we have an exclusive oplock
340 * then setup the write cache.
343 if (!fsp
->modified
&&
344 EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
) &&
347 * Note: no write cache with leases!
348 * as the handles would have to share the write cache
349 * that's possible but an improvement for another day...
351 setup_write_cache(fsp
, fsp
->fsp_name
->st
.st_ex_size
);
355 mark_file_modified(fsp
);
357 DO_PROFILE_INC(writecache_total_writes
);
358 if (!fsp
->oplock_type
) {
359 DO_PROFILE_INC(writecache_non_oplock_writes
);
363 * If this file is level II oplocked then we need
364 * to grab the shared memory lock and inform all
365 * other files with a level II lock that they need
366 * to flush their read caches. We keep the lock over
367 * the shared memory area whilst doing this.
370 /* This should actually be improved to span the write. */
371 contend_level2_oplocks_begin(fsp
, LEVEL2_CONTEND_WRITE
);
372 contend_level2_oplocks_end(fsp
, LEVEL2_CONTEND_WRITE
);
374 if (wcp
&& req
->unread_bytes
) {
375 /* If we're using receivefile don't
376 * deal with a write cache.
378 flush_write_cache(fsp
, SAMBA_WRITE_FLUSH
);
379 delete_write_cache(fsp
);
384 DO_PROFILE_INC(writecache_direct_writes
);
385 total_written
= real_write_file(req
, fsp
, data
, pos
, n
);
386 return total_written
;
389 DEBUG(9,("write_file (%s)(fd=%d pos=%.0f size=%u) wcp->offset=%.0f "
390 "wcp->data_size=%u\n", fsp_str_dbg(fsp
), fsp
->fh
->fd
,
391 (double)pos
, (unsigned int)n
, (double)wcp
->offset
,
392 (unsigned int)wcp
->data_size
));
394 fsp
->fh
->pos
= pos
+ n
;
396 if ((n
== 1) && (data
[0] == '\0') && (pos
> wcp
->file_size
)) {
400 * This is a 1-byte write of a 0 beyond the EOF and
401 * thus implicitly also beyond the current active
402 * write cache, the typical file-extending (and
403 * allocating, but we're using the write cache here)
404 * write done by Windows. We just have to ftruncate
405 * the file and rely on posix semantics to return
406 * zeros for non-written file data that is within the
409 * We can not use wcp_file_size_change here because we
410 * might have an existing write cache, and
411 * wcp_file_size_change assumes a change to just the
412 * end of the current write cache.
415 wcp
->file_size
= pos
+ 1;
416 ret
= SMB_VFS_FTRUNCATE(fsp
, wcp
->file_size
);
418 DEBUG(0, ("wcp_file_size_change (%s): ftruncate of "
419 "size %.0f error %s\n", fsp_str_dbg(fsp
),
420 (double)wcp
->file_size
, strerror(errno
)));
428 * If we have active cache and it isn't contiguous then we flush.
429 * NOTE: There is a small problem with running out of disk ....
432 if (wcp
->data_size
) {
433 bool cache_flush_needed
= False
;
435 if ((pos
>= wcp
->offset
) &&
436 (pos
<= wcp
->offset
+ wcp
->data_size
)) {
438 /* ASCII art.... JRA.
440 +--------------+-----
441 | Cached data | Rest of allocated cache buffer....
442 +--------------+-----
444 +-------------------+
446 +-------------------+
451 * Start of write overlaps or abutts the existing data.
456 data_used
= MIN((wcp
->alloc_size
- (pos
- wcp
->offset
)),
459 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
,
463 * Update the current buffer size with the new data.
466 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
467 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
471 * Update the file size if changed.
474 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
475 if (wcp_file_size_change(fsp
) == -1) {
481 * If we used all the data then
488 cache_flush_needed
= True
;
491 * Move the start of data forward by the amount used,
492 * cut down the amount left by the same amount.
499 DO_PROFILE_INC(writecache_abutted_writes
);
500 total_written
= data_used
;
504 } else if ((pos
< wcp
->offset
) &&
505 (pos
+ n
> wcp
->offset
) &&
506 (pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
)) {
508 /* ASCII art.... JRA.
514 +-------------------+
516 +-------------------+
521 * End of write overlaps the existing data.
524 size_t data_used
= pos
+ n
- wcp
->offset
;
526 memcpy(wcp
->data
, data
+ n
- data_used
, data_used
);
529 * Update the current buffer size with the new data.
532 if(pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
533 wcp
->data_size
= pos
+ n
- wcp
->offset
;
537 * Update the file size if changed.
540 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
541 if (wcp_file_size_change(fsp
) == -1) {
547 * We don't need to move the start of data, but we
548 * cut down the amount left by the amount used.
554 * We cannot have used all the data here.
557 cache_flush_needed
= True
;
559 DO_PROFILE_INC(writecache_abutted_writes
);
560 total_written
= data_used
;
564 } else if ((pos
>= wcp
->file_size
) &&
565 (wcp
->offset
+ wcp
->data_size
== wcp
->file_size
) &&
566 (pos
> wcp
->offset
+ wcp
->data_size
) &&
567 (pos
< wcp
->offset
+ wcp
->alloc_size
) ) {
569 /* ASCII art.... JRA.
573 +---------------+---------------+
574 | Cached data | Cache buffer |
575 +---------------+---------------+
577 +-------------------+
579 +-------------------+
584 * Non-contiguous write part of which fits within
585 * the cache buffer and is extending the file
586 * and the cache contents reflect the current
587 * data up to the current end of the file.
592 if(pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
) {
595 data_used
= wcp
->offset
+wcp
->alloc_size
-pos
;
599 * Fill in the non-continuous area with zeros.
602 memset(wcp
->data
+ wcp
->data_size
, '\0',
603 pos
- (wcp
->offset
+ wcp
->data_size
) );
605 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
,
609 * Update the current buffer size with the new data.
612 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
613 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
617 * Update the file size if changed.
620 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
621 if (wcp_file_size_change(fsp
) == -1) {
627 * If we used all the data then
634 cache_flush_needed
= True
;
638 * Move the start of data forward by the amount used,
639 * cut down the amount left by the same amount.
646 DO_PROFILE_INC(writecache_abutted_writes
);
647 total_written
= data_used
;
651 } else if ( (pos
>= wcp
->file_size
) &&
653 (wcp
->file_size
== wcp
->offset
+ wcp
->data_size
) &&
654 (pos
< wcp
->file_size
+ wcp
->alloc_size
)) {
660 +---------------+---------------+
661 | Cached data | Cache buffer |
662 +---------------+---------------+
664 |<------- allocated size ---------------->|
670 MS-Office seems to do this a lot to determine if
671 there's enough space on the filesystem to write a new
677 +-----------------------+--------+
678 | Zeroed Cached data | 1 Byte |
679 +-----------------------+--------+
682 flush_write_cache(fsp
, SAMBA_WRITE_FLUSH
);
683 wcp
->offset
= wcp
->file_size
;
684 wcp
->data_size
= pos
- wcp
->file_size
+ 1;
685 memset(wcp
->data
, '\0', wcp
->data_size
);
686 memcpy(wcp
->data
+ wcp
->data_size
-1, data
, 1);
689 * Update the file size if changed.
692 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
693 if (wcp_file_size_change(fsp
) == -1) {
702 /* ASCII art..... JRA.
706 +---------------+---------------+
707 | Cached data | Cache buffer |
708 +---------------+---------------+
716 +---------------+---------------+
717 | Cached data | Cache buffer |
718 +---------------+---------------+
720 +-------------------+
722 +-------------------+
726 +---------------+---------------+
727 | Cached data | Cache buffer |
728 +---------------+---------------+
730 +-----------------------------------------------------+
732 +-----------------------------------------------------+
737 * Write is bigger than buffer, or there is no
738 * overlap on the low or high ends.
741 DEBUG(9,("write_file: non cacheable write : fd = %d, "
742 "pos = %.0f, len = %u, "
743 "current cache pos = %.0f len = %u\n",
744 fsp
->fh
->fd
, (double)pos
, (unsigned int)n
,
746 (unsigned int)wcp
->data_size
));
749 * If write would fit in the cache, and is
750 * larger than the data already in the cache,
751 * flush the cache and preferentially copy the
752 * data new data into it. Otherwise just write
756 if ( n
<= wcp
->alloc_size
&& n
> wcp
->data_size
) {
757 cache_flush_needed
= True
;
759 ssize_t ret
= real_write_file(NULL
, fsp
, data
,
763 * If the write overlaps the entire
764 * cache, then discard the current
765 * contents of the cache. Fix from
766 * Rasmus Borup Hansen rbh@math.ku.dk.
769 if ((pos
<= wcp
->offset
) &&
770 (pos
+ n
>= wcp
->offset
+wcp
->data_size
)) {
771 DEBUG(9,("write_file: discarding "
772 "overwritten write cache: "
773 "fd = %d, off=%.0f, "
774 "size=%u\n", fsp
->fh
->fd
,
776 (unsigned)wcp
->data_size
));
780 DO_PROFILE_INC(writecache_direct_writes
);
785 if (pos
+ ret
> wcp
->file_size
) {
786 wcp
->file_size
= pos
+ ret
;
796 if (cache_flush_needed
) {
797 DEBUG(3, ("SAMBA_WRITE_FLUSH:%d: due to noncontinuous "
798 "write: fd = %d, size = %.0f, pos = %.0f, "
799 "n = %u, wcp->offset=%.0f, "
800 "wcp->data_size=%u\n",
801 write_path
, fsp
->fh
->fd
,
802 (double)wcp
->file_size
, (double)pos
,
803 (unsigned int)n
, (double)wcp
->offset
,
804 (unsigned int)wcp
->data_size
));
806 flush_write_cache(fsp
, SAMBA_WRITE_FLUSH
);
811 * If the write request is bigger than the cache
812 * size, write it all out.
815 if (n
> wcp
->alloc_size
) {
816 ssize_t ret
= real_write_file(NULL
,fsp
, data
, pos
, n
);
821 if (pos
+ ret
> wcp
->file_size
) {
822 wcp
->file_size
= pos
+ n
;
825 DO_PROFILE_INC(writecache_direct_writes
);
826 return total_written
+ n
;
830 * If there's any data left, cache it.
834 DO_PROFILE_INC(writecache_cached_writes
);
835 if (wcp
->data_size
) {
836 DO_PROFILE_INC(writecache_abutted_writes
);
838 DO_PROFILE_INC(writecache_init_writes
);
841 if ((wcp
->data_size
== 0)
842 && (pos
> wcp
->file_size
)
843 && (pos
+ n
<= wcp
->file_size
+ wcp
->alloc_size
)) {
845 * This is a write completely beyond the
846 * current EOF, but within reach of the write
847 * cache. We expect fill-up writes pretty
848 * soon, so it does not make sense to start
849 * the write cache at the current
850 * offset. These fill-up writes would trigger
851 * separate pwrites or even unnecessary cache
852 * flushes because they overlap if this is a
853 * one-byte allocating write.
855 wcp
->offset
= wcp
->file_size
;
856 wcp
->data_size
= pos
- wcp
->file_size
;
857 memset(wcp
->data
, 0, wcp
->data_size
);
860 memcpy(wcp
->data
+wcp
->data_size
, data
, n
);
861 if (wcp
->data_size
== 0) {
867 * Update the file size if changed.
870 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
871 if (wcp_file_size_change(fsp
) == -1) {
875 DEBUG(9, ("wcp->offset = %.0f wcp->data_size = %u cache "
877 (double)wcp
->offset
, (unsigned int)wcp
->data_size
,
881 return total_written
; /* .... that's a write :) */
884 return total_written
;
887 /****************************************************************************
888 Delete the write cache structure.
889 ****************************************************************************/
891 void delete_write_cache(files_struct
*fsp
)
893 struct write_cache
*wcp
;
899 if(!(wcp
= fsp
->wcp
)) {
903 DO_PROFILE_INC(writecache_deallocations
);
904 allocated_write_caches
--;
906 SMB_ASSERT(wcp
->data_size
== 0);
908 SAFE_FREE(wcp
->data
);
911 DEBUG(10,("delete_write_cache: File %s deleted write cache\n",
915 /****************************************************************************
916 Setup the write cache structure.
917 ****************************************************************************/
919 static bool setup_write_cache(files_struct
*fsp
, off_t file_size
)
921 ssize_t alloc_size
= lp_write_cache_size(SNUM(fsp
->conn
));
922 struct write_cache
*wcp
;
924 if (allocated_write_caches
>= MAX_WRITE_CACHES
) {
928 if(alloc_size
== 0 || fsp
->wcp
) {
932 if((wcp
= SMB_MALLOC_P(struct write_cache
)) == NULL
) {
933 DEBUG(0,("setup_write_cache: malloc fail.\n"));
937 wcp
->file_size
= file_size
;
939 wcp
->alloc_size
= alloc_size
;
941 if((wcp
->data
= (char *)SMB_MALLOC(wcp
->alloc_size
)) == NULL
) {
942 DEBUG(0,("setup_write_cache: malloc fail for buffer size %u.\n",
943 (unsigned int)wcp
->alloc_size
));
948 memset(wcp
->data
, '\0', wcp
->alloc_size
);
951 DO_PROFILE_INC(writecache_allocations
);
952 allocated_write_caches
++;
954 DEBUG(10,("setup_write_cache: File %s allocated write cache size %lu\n",
955 fsp_str_dbg(fsp
), (unsigned long)wcp
->alloc_size
));
960 /****************************************************************************
961 Cope with a size change.
962 ****************************************************************************/
964 void set_filelen_write_cache(files_struct
*fsp
, off_t file_size
)
967 /* The cache *must* have been flushed before we do this. */
968 if (fsp
->wcp
->data_size
!= 0) {
970 if (asprintf(&msg
, "set_filelen_write_cache: size change "
971 "on file %s with write cache size = %lu\n",
972 fsp
->fsp_name
->base_name
,
973 (unsigned long)fsp
->wcp
->data_size
) != -1) {
976 smb_panic("set_filelen_write_cache");
979 fsp
->wcp
->file_size
= file_size
;
983 /*******************************************************************
984 Flush a write cache struct to disk.
985 ********************************************************************/
987 ssize_t
flush_write_cache(files_struct
*fsp
, enum flush_reason_enum reason
)
989 struct write_cache
*wcp
= fsp
->wcp
;
993 if(!wcp
|| !wcp
->data_size
) {
997 data_size
= wcp
->data_size
;
1001 case SAMBA_SEEK_FLUSH
:
1002 DO_PROFILE_INC(writecache_flush_reason_seek
);
1004 case SAMBA_READ_FLUSH
:
1005 DO_PROFILE_INC(writecache_flush_reason_read
);
1007 case SAMBA_WRITE_FLUSH
:
1008 DO_PROFILE_INC(writecache_flush_reason_write
);;
1010 case SAMBA_READRAW_FLUSH
:
1011 DO_PROFILE_INC(writecache_flush_reason_readraw
);
1013 case SAMBA_OPLOCK_RELEASE_FLUSH
:
1014 DO_PROFILE_INC(writecache_flush_reason_oplock
);
1016 case SAMBA_CLOSE_FLUSH
:
1017 DO_PROFILE_INC(writecache_flush_reason_close
);
1019 case SAMBA_SYNC_FLUSH
:
1020 DO_PROFILE_INC(writecache_flush_reason_sync
);
1022 case SAMBA_SIZECHANGE_FLUSH
:
1023 DO_PROFILE_INC(writecache_flush_reason_sizechange
);
1029 DEBUG(9,("flushing write cache: fd = %d, off=%.0f, size=%u\n",
1030 fsp
->fh
->fd
, (double)wcp
->offset
, (unsigned int)data_size
));
1032 if(data_size
== wcp
->alloc_size
) {
1033 DO_PROFILE_INC(writecache_perfect_writes
);
1036 ret
= real_write_file(NULL
, fsp
, wcp
->data
, wcp
->offset
, data_size
);
1039 * Ensure file size if kept up to date if write extends file.
1042 if ((ret
!= -1) && (wcp
->offset
+ ret
> wcp
->file_size
)) {
1043 wcp
->file_size
= wcp
->offset
+ ret
;
1049 /*******************************************************************
1051 ********************************************************************/
1053 NTSTATUS
sync_file(connection_struct
*conn
, files_struct
*fsp
, bool write_through
)
1055 if (fsp
->fh
->fd
== -1)
1056 return NT_STATUS_INVALID_HANDLE
;
1058 if (lp_strict_sync(SNUM(conn
)) &&
1059 (lp_sync_always(SNUM(conn
)) || write_through
)) {
1060 int ret
= flush_write_cache(fsp
, SAMBA_SYNC_FLUSH
);
1062 return map_nt_error_from_unix(errno
);
1064 ret
= smb_vfs_fsync_sync(fsp
);
1066 return map_nt_error_from_unix(errno
);
1069 return NT_STATUS_OK
;