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/>.
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
;
39 if( n
> wcp
->data_size
|| pos
< wcp
->offset
|| pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
43 memcpy(data
, wcp
->data
+ (pos
- wcp
->offset
), n
);
45 DO_PROFILE_INC(writecache_read_hits
);
50 /****************************************************************************
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
) {
65 * Serve from write cache if we can.
68 if(read_from_write_cache(fsp
, data
, pos
, n
)) {
69 fsp
->fh
->pos
= pos
+ n
;
70 fsp
->fh
->position_information
= fsp
->fh
->pos
;
74 flush_write_cache(fsp
, READ_FLUSH
);
82 readret
= SMB_VFS_PREAD(fsp
,data
,n
,pos
);
85 if ((errno
== EAGAIN
) && numretries
) {
86 DEBUG(3,("read_file EAGAIN retry in 10 seconds\n"));
93 #else /* NO DMF fix. */
94 readret
= SMB_VFS_PREAD(fsp
,data
,n
,pos
);
105 DEBUG(10,("read_file (%s): pos = %.0f, size = %lu, returned %lu\n",
106 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
109 fsp
->fh
->position_information
= fsp
->fh
->pos
;
114 /****************************************************************************
115 *Really* write to a file.
116 ****************************************************************************/
118 static ssize_t
real_write_file(struct smb_request
*req
,
127 ret
= vfs_write_data(req
, fsp
, data
, n
);
130 if (pos
&& lp_strict_allocate(SNUM(fsp
->conn
))) {
131 if (vfs_fill_sparse(fsp
, pos
) == -1) {
135 ret
= vfs_pwrite_data(req
, fsp
, data
, n
, pos
);
138 DEBUG(10,("real_write_file (%s): pos = %.0f, size = %lu, returned %ld\n",
139 fsp_str_dbg(fsp
), (double)pos
, (unsigned long)n
, (long)ret
));
144 /* Yes - this is correct - writes don't update this. JRA. */
145 /* Found by Samba4 tests. */
147 fsp
->position_information
= fsp
->pos
;
154 /****************************************************************************
155 File size cache change.
156 Updates size on disk but doesn't flush the cache.
157 ****************************************************************************/
159 static int wcp_file_size_change(files_struct
*fsp
)
162 write_cache
*wcp
= fsp
->wcp
;
164 wcp
->file_size
= wcp
->offset
+ wcp
->data_size
;
165 ret
= SMB_VFS_FTRUNCATE(fsp
, wcp
->file_size
);
167 DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f "
168 "error %s\n", fsp_str_dbg(fsp
),
169 (double)wcp
->file_size
, strerror(errno
)));
174 void update_write_time_handler(struct event_context
*ctx
,
175 struct timed_event
*te
,
179 files_struct
*fsp
= (files_struct
*)private_data
;
181 DEBUG(5, ("Update write time on %s\n", fsp_str_dbg(fsp
)));
183 /* change the write time in the open file db. */
184 (void)set_write_time(fsp
->file_id
, timespec_current());
187 notify_fname(fsp
->conn
, NOTIFY_ACTION_MODIFIED
,
188 FILE_NOTIFY_CHANGE_LAST_WRITE
, fsp
->fsp_name
->base_name
);
190 /* Remove the timed event handler. */
191 TALLOC_FREE(fsp
->update_write_time_event
);
194 /*********************************************************
195 Schedule a write time update for WRITE_TIME_UPDATE_USEC_DELAY
197 *********************************************************/
199 void trigger_write_time_update(struct files_struct
*fsp
)
203 if (fsp
->posix_open
) {
204 /* Don't use delayed writes on POSIX files. */
208 if (fsp
->write_time_forced
) {
209 /* No point - "sticky" write times
215 /* We need to remember someone did a write
216 * and update to current time on close. */
218 fsp
->update_write_time_on_close
= true;
220 if (fsp
->update_write_time_triggered
) {
222 * We only update the write time after 2 seconds
223 * on the first normal write. After that
224 * no other writes affect this until close.
228 fsp
->update_write_time_triggered
= true;
230 delay
= lp_parm_int(SNUM(fsp
->conn
),
231 "smbd", "writetimeupdatedelay",
232 WRITE_TIME_UPDATE_USEC_DELAY
);
234 DEBUG(5, ("Update write time %d usec later on %s\n",
235 delay
, fsp_str_dbg(fsp
)));
237 /* trigger the update 2 seconds later */
238 fsp
->update_write_time_event
=
239 event_add_timed(smbd_event_context(), NULL
,
240 timeval_current_ofs(0, delay
),
241 update_write_time_handler
, fsp
);
244 void trigger_write_time_update_immediate(struct files_struct
*fsp
)
246 struct smb_file_time ft
;
248 if (fsp
->posix_open
) {
249 /* Don't use delayed writes on POSIX files. */
253 if (fsp
->write_time_forced
) {
255 * No point - "sticky" write times
261 TALLOC_FREE(fsp
->update_write_time_event
);
262 DEBUG(5, ("Update write time immediate on %s\n",
265 /* After an immediate update, reset the trigger. */
266 fsp
->update_write_time_triggered
= true;
267 fsp
->update_write_time_on_close
= false;
270 ft
.mtime
= timespec_current();
272 /* Update the time in the open file db. */
273 (void)set_write_time(fsp
->file_id
, ft
.mtime
);
275 /* Now set on disk - takes care of notify. */
276 (void)smb_set_file_time(fsp
->conn
, fsp
, fsp
->fsp_name
, &ft
, false);
279 /****************************************************************************
281 ****************************************************************************/
283 ssize_t
write_file(struct smb_request
*req
,
289 write_cache
*wcp
= fsp
->wcp
;
290 ssize_t total_written
= 0;
293 if (fsp
->print_file
) {
296 if (!rap_to_pjobid(fsp
->print_file
->rap_jobid
, NULL
, &jobid
)) {
297 DEBUG(3, ("write_file: "
298 "Unable to map RAP jobid %u to jobid.\n",
299 (unsigned int)fsp
->print_file
->rap_jobid
));
304 /* support seeks for print files bigger than 4G */
305 pos
= printfile_offset(fsp
, pos
);
307 return print_job_write(SNUM(fsp
->conn
), jobid
, data
, pos
, n
);
310 if (!fsp
->can_write
) {
315 if (!fsp
->modified
) {
316 fsp
->modified
= True
;
318 if (SMB_VFS_FSTAT(fsp
, &fsp
->fsp_name
->st
) == 0) {
320 trigger_write_time_update(fsp
);
321 dosmode
= dos_mode(fsp
->conn
, fsp
->fsp_name
);
322 if ((lp_store_dos_attributes(SNUM(fsp
->conn
)) ||
323 MAP_ARCHIVE(fsp
->conn
)) &&
324 !IS_DOS_ARCHIVE(dosmode
)) {
325 file_set_dosmode(fsp
->conn
, fsp
->fsp_name
,
326 dosmode
| aARCH
, NULL
, false);
330 * If this is the first write and we have an exclusive oplock then setup
334 if (EXCLUSIVE_OPLOCK_TYPE(fsp
->oplock_type
) && !wcp
) {
335 setup_write_cache(fsp
,
336 fsp
->fsp_name
->st
.st_ex_size
);
343 DO_PROFILE_INC(writecache_total_writes
);
344 if (!fsp
->oplock_type
) {
345 DO_PROFILE_INC(writecache_non_oplock_writes
);
350 * If this file is level II oplocked then we need
351 * to grab the shared memory lock and inform all
352 * other files with a level II lock that they need
353 * to flush their read caches. We keep the lock over
354 * the shared memory area whilst doing this.
357 /* This should actually be improved to span the write. */
358 contend_level2_oplocks_begin(fsp
, LEVEL2_CONTEND_WRITE
);
359 contend_level2_oplocks_end(fsp
, LEVEL2_CONTEND_WRITE
);
362 if (profile_p
&& profile_p
->writecache_total_writes
% 500 == 0) {
363 DEBUG(3,("WRITECACHE: initwrites=%u abutted=%u total=%u \
364 nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
365 profile_p
->writecache_init_writes
,
366 profile_p
->writecache_abutted_writes
,
367 profile_p
->writecache_total_writes
,
368 profile_p
->writecache_non_oplock_writes
,
369 profile_p
->writecache_allocated_write_caches
,
370 profile_p
->writecache_num_write_caches
,
371 profile_p
->writecache_direct_writes
,
372 profile_p
->writecache_num_perfect_writes
,
373 profile_p
->writecache_read_hits
));
375 DEBUG(3,("WRITECACHE: Flushes SEEK=%d, READ=%d, WRITE=%d, READRAW=%d, OPLOCK=%d, CLOSE=%d, SYNC=%d\n",
376 profile_p
->writecache_flushed_writes
[SEEK_FLUSH
],
377 profile_p
->writecache_flushed_writes
[READ_FLUSH
],
378 profile_p
->writecache_flushed_writes
[WRITE_FLUSH
],
379 profile_p
->writecache_flushed_writes
[READRAW_FLUSH
],
380 profile_p
->writecache_flushed_writes
[OPLOCK_RELEASE_FLUSH
],
381 profile_p
->writecache_flushed_writes
[CLOSE_FLUSH
],
382 profile_p
->writecache_flushed_writes
[SYNC_FLUSH
] ));
386 if (wcp
&& req
->unread_bytes
) {
387 /* If we're using receivefile don't
388 * deal with a write cache.
390 flush_write_cache(fsp
, WRITE_FLUSH
);
391 delete_write_cache(fsp
);
396 DO_PROFILE_INC(writecache_direct_writes
);
397 total_written
= real_write_file(req
, fsp
, data
, pos
, n
);
398 return total_written
;
401 DEBUG(9,("write_file (%s)(fd=%d pos=%.0f size=%u) wcp->offset=%.0f "
402 "wcp->data_size=%u\n", fsp_str_dbg(fsp
), fsp
->fh
->fd
,
403 (double)pos
, (unsigned int)n
, (double)wcp
->offset
,
404 (unsigned int)wcp
->data_size
));
406 fsp
->fh
->pos
= pos
+ n
;
409 * If we have active cache and it isn't contiguous then we flush.
410 * NOTE: There is a small problem with running out of disk ....
413 if (wcp
->data_size
) {
414 bool cache_flush_needed
= False
;
416 if ((pos
>= wcp
->offset
) && (pos
<= wcp
->offset
+ wcp
->data_size
)) {
418 /* ASCII art.... JRA.
420 +--------------+-----
421 | Cached data | Rest of allocated cache buffer....
422 +--------------+-----
424 +-------------------+
426 +-------------------+
431 * Start of write overlaps or abutts the existing data.
434 size_t data_used
= MIN((wcp
->alloc_size
- (pos
- wcp
->offset
)), n
);
436 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
, data_used
);
439 * Update the current buffer size with the new data.
442 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
443 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
447 * Update the file size if changed.
450 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
451 if (wcp_file_size_change(fsp
) == -1) {
457 * If we used all the data then
464 cache_flush_needed
= True
;
467 * Move the start of data forward by the amount used,
468 * cut down the amount left by the same amount.
475 DO_PROFILE_INC(writecache_abutted_writes
);
476 total_written
= data_used
;
480 } else if ((pos
< wcp
->offset
) && (pos
+ n
> wcp
->offset
) &&
481 (pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
)) {
483 /* ASCII art.... JRA.
489 +-------------------+
491 +-------------------+
496 * End of write overlaps the existing data.
499 size_t data_used
= pos
+ n
- wcp
->offset
;
501 memcpy(wcp
->data
, data
+ n
- data_used
, data_used
);
504 * Update the current buffer size with the new data.
507 if(pos
+ n
> wcp
->offset
+ wcp
->data_size
) {
508 wcp
->data_size
= pos
+ n
- wcp
->offset
;
512 * Update the file size if changed.
515 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
516 if (wcp_file_size_change(fsp
) == -1) {
522 * We don't need to move the start of data, but we
523 * cut down the amount left by the amount used.
529 * We cannot have used all the data here.
532 cache_flush_needed
= True
;
534 DO_PROFILE_INC(writecache_abutted_writes
);
535 total_written
= data_used
;
539 } else if ( (pos
>= wcp
->file_size
) &&
540 (wcp
->offset
+ wcp
->data_size
== wcp
->file_size
) &&
541 (pos
> wcp
->offset
+ wcp
->data_size
) &&
542 (pos
< wcp
->offset
+ wcp
->alloc_size
) ) {
544 /* ASCII art.... JRA.
548 +---------------+---------------+
549 | Cached data | Cache buffer |
550 +---------------+---------------+
552 +-------------------+
554 +-------------------+
559 * Non-contiguous write part of which fits within
560 * the cache buffer and is extending the file
561 * and the cache contents reflect the current
562 * data up to the current end of the file.
567 if(pos
+ n
<= wcp
->offset
+ wcp
->alloc_size
) {
570 data_used
= wcp
->offset
+ wcp
->alloc_size
- pos
;
574 * Fill in the non-continuous area with zeros.
577 memset(wcp
->data
+ wcp
->data_size
, '\0',
578 pos
- (wcp
->offset
+ wcp
->data_size
) );
580 memcpy(wcp
->data
+ (pos
- wcp
->offset
), data
, data_used
);
583 * Update the current buffer size with the new data.
586 if(pos
+ data_used
> wcp
->offset
+ wcp
->data_size
) {
587 wcp
->data_size
= pos
+ data_used
- wcp
->offset
;
591 * Update the file size if changed.
594 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
595 if (wcp_file_size_change(fsp
) == -1) {
601 * If we used all the data then
608 cache_flush_needed
= True
;
612 * Move the start of data forward by the amount used,
613 * cut down the amount left by the same amount.
620 DO_PROFILE_INC(writecache_abutted_writes
);
621 total_written
= data_used
;
625 } else if ( (pos
>= wcp
->file_size
) &&
627 (wcp
->file_size
== wcp
->offset
+ wcp
->data_size
) &&
628 (pos
< wcp
->file_size
+ wcp
->alloc_size
)) {
634 +---------------+---------------+
635 | Cached data | Cache buffer |
636 +---------------+---------------+
638 |<------- allocated size ---------------->|
644 MS-Office seems to do this a lot to determine if there's enough
645 space on the filesystem to write a new file.
650 +-----------------------+--------+
651 | Zeroed Cached data | 1 Byte |
652 +-----------------------+--------+
655 flush_write_cache(fsp
, WRITE_FLUSH
);
657 if (data
[0] == '\0') {
659 * This is a 1-byte write of a 0
660 * beyond the EOF, the typical
661 * file-extending (and allocating, but
662 * we're using the write cache here)
663 * write done by Windows. We just have
664 * to ftruncate the file and rely on
665 * posix semantics to return zeros for
666 * non-written file data that is
667 * within the file length.
669 * We have to cheat the offset to make
670 * wcp_file_size_change do the right
671 * thing with the ftruncate call.
673 wcp
->offset
= pos
+ 1;
676 wcp
->offset
= wcp
->file_size
;
677 wcp
->data_size
= pos
- wcp
->file_size
+ 1;
678 memset(wcp
->data
, '\0', wcp
->data_size
);
679 memcpy(wcp
->data
+ wcp
->data_size
-1, data
, 1);
683 * Update the file size if changed.
686 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
687 if (wcp_file_size_change(fsp
) == -1) {
696 /* ASCII art..... JRA.
700 +---------------+---------------+
701 | Cached data | Cache buffer |
702 +---------------+---------------+
704 +-------------------+
706 +-------------------+
710 +---------------+---------------+
711 | Cached data | Cache buffer |
712 +---------------+---------------+
714 +-------------------+
716 +-------------------+
720 +---------------+---------------+
721 | Cached data | Cache buffer |
722 +---------------+---------------+
724 +-----------------------------------------------------+
726 +-----------------------------------------------------+
731 * Write is bigger than buffer, or there is no overlap on the
735 DEBUG(9,("write_file: non cacheable write : fd = %d, pos = %.0f, len = %u, current cache pos = %.0f \
736 len = %u\n",fsp
->fh
->fd
, (double)pos
, (unsigned int)n
, (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
739 * If write would fit in the cache, and is larger than
740 * the data already in the cache, flush the cache and
741 * preferentially copy the data new data into it. Otherwise
742 * just write the data directly.
745 if ( n
<= wcp
->alloc_size
&& n
> wcp
->data_size
) {
746 cache_flush_needed
= True
;
748 ssize_t ret
= real_write_file(NULL
,fsp
, data
, pos
, n
);
751 * If the write overlaps the entire cache, then
752 * discard the current contents of the cache.
753 * Fix from Rasmus Borup Hansen rbh@math.ku.dk.
756 if ((pos
<= wcp
->offset
) &&
757 (pos
+ n
>= wcp
->offset
+ wcp
->data_size
) ) {
758 DEBUG(9,("write_file: discarding overwritten write \
759 cache: fd = %d, off=%.0f, size=%u\n", fsp
->fh
->fd
, (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
763 DO_PROFILE_INC(writecache_direct_writes
);
768 if (pos
+ ret
> wcp
->file_size
) {
769 wcp
->file_size
= pos
+ ret
;
779 if (cache_flush_needed
) {
780 DEBUG(3,("WRITE_FLUSH:%d: due to noncontinuous write: fd = %d, size = %.0f, pos = %.0f, \
781 n = %u, wcp->offset=%.0f, wcp->data_size=%u\n",
782 write_path
, fsp
->fh
->fd
, (double)wcp
->file_size
, (double)pos
, (unsigned int)n
,
783 (double)wcp
->offset
, (unsigned int)wcp
->data_size
));
785 flush_write_cache(fsp
, WRITE_FLUSH
);
790 * If the write request is bigger than the cache
791 * size, write it all out.
794 if (n
> wcp
->alloc_size
) {
795 ssize_t ret
= real_write_file(NULL
,fsp
, data
, pos
, n
);
800 if (pos
+ ret
> wcp
->file_size
) {
801 wcp
->file_size
= pos
+ n
;
804 DO_PROFILE_INC(writecache_direct_writes
);
805 return total_written
+ n
;
809 * If there's any data left, cache it.
814 if (wcp
->data_size
) {
815 DO_PROFILE_INC(writecache_abutted_writes
);
817 DO_PROFILE_INC(writecache_init_writes
);
821 if ((wcp
->data_size
== 0)
822 && (pos
> wcp
->file_size
)
824 && (data
[0] == '\0')) {
826 * This is a 1-byte write of a 0 beyond the
827 * EOF, the typical file-extending (and
828 * allocating, but we're using the write cache
829 * here) write done by Windows. We just have
830 * to ftruncate the file and rely on posix
831 * semantics to return zeros for non-written
832 * file data that is within the file length.
834 * We have to cheat the offset to make
835 * wcp_file_size_change do the right thing
836 * with the ftruncate call.
840 if (wcp_file_size_change(fsp
) == -1) {
846 if ((wcp
->data_size
== 0)
847 && (pos
> wcp
->file_size
)
848 && (pos
+ n
<= wcp
->file_size
+ wcp
->alloc_size
)) {
850 * This is a write completely beyond the
851 * current EOF, but within reach of the write
852 * cache. We expect fill-up writes pretty
853 * soon, so it does not make sense to start
854 * the write cache at the current
855 * offset. These fill-up writes would trigger
856 * separate pwrites or even unnecessary cache
857 * flushes because they overlap if this is a
858 * one-byte allocating write.
860 wcp
->offset
= wcp
->file_size
;
861 wcp
->data_size
= pos
- wcp
->file_size
;
862 memset(wcp
->data
, 0, wcp
->data_size
);
865 memcpy(wcp
->data
+wcp
->data_size
, data
, n
);
866 if (wcp
->data_size
== 0) {
868 DO_PROFILE_INC(writecache_num_write_caches
);
873 * Update the file size if changed.
876 if (wcp
->offset
+ wcp
->data_size
> wcp
->file_size
) {
877 if (wcp_file_size_change(fsp
) == -1) {
881 DEBUG(9,("wcp->offset = %.0f wcp->data_size = %u cache return %u\n",
882 (double)wcp
->offset
, (unsigned int)wcp
->data_size
, (unsigned int)n
));
885 return total_written
; /* .... that's a write :) */
888 return total_written
;
891 /****************************************************************************
892 Delete the write cache structure.
893 ****************************************************************************/
895 void delete_write_cache(files_struct
*fsp
)
903 if(!(wcp
= fsp
->wcp
)) {
907 DO_PROFILE_DEC(writecache_allocated_write_caches
);
908 allocated_write_caches
--;
910 SMB_ASSERT(wcp
->data_size
== 0);
912 SAFE_FREE(wcp
->data
);
915 DEBUG(10,("delete_write_cache: File %s deleted write cache\n",
919 /****************************************************************************
920 Setup the write cache structure.
921 ****************************************************************************/
923 static bool setup_write_cache(files_struct
*fsp
, SMB_OFF_T file_size
)
925 ssize_t alloc_size
= lp_write_cache_size(SNUM(fsp
->conn
));
928 if (allocated_write_caches
>= MAX_WRITE_CACHES
) {
932 if(alloc_size
== 0 || fsp
->wcp
) {
936 if((wcp
= SMB_MALLOC_P(write_cache
)) == NULL
) {
937 DEBUG(0,("setup_write_cache: malloc fail.\n"));
941 wcp
->file_size
= file_size
;
943 wcp
->alloc_size
= alloc_size
;
945 if((wcp
->data
= (char *)SMB_MALLOC(wcp
->alloc_size
)) == NULL
) {
946 DEBUG(0,("setup_write_cache: malloc fail for buffer size %u.\n",
947 (unsigned int)wcp
->alloc_size
));
952 memset(wcp
->data
, '\0', wcp
->alloc_size
);
955 DO_PROFILE_INC(writecache_allocated_write_caches
);
956 allocated_write_caches
++;
958 DEBUG(10,("setup_write_cache: File %s allocated write cache size %lu\n",
959 fsp_str_dbg(fsp
), (unsigned long)wcp
->alloc_size
));
964 /****************************************************************************
965 Cope with a size change.
966 ****************************************************************************/
968 void set_filelen_write_cache(files_struct
*fsp
, SMB_OFF_T file_size
)
971 /* The cache *must* have been flushed before we do this. */
972 if (fsp
->wcp
->data_size
!= 0) {
974 if (asprintf(&msg
, "set_filelen_write_cache: size change "
975 "on file %s with write cache size = %lu\n",
976 fsp
->fsp_name
->base_name
,
977 (unsigned long)fsp
->wcp
->data_size
) != -1) {
980 smb_panic("set_filelen_write_cache");
983 fsp
->wcp
->file_size
= file_size
;
987 /*******************************************************************
988 Flush a write cache struct to disk.
989 ********************************************************************/
991 ssize_t
flush_write_cache(files_struct
*fsp
, enum flush_reason_enum reason
)
993 write_cache
*wcp
= fsp
->wcp
;
997 if(!wcp
|| !wcp
->data_size
) {
1001 data_size
= wcp
->data_size
;
1004 DO_PROFILE_DEC_INC(writecache_num_write_caches
,writecache_flushed_writes
[reason
]);
1006 DEBUG(9,("flushing write cache: fd = %d, off=%.0f, size=%u\n",
1007 fsp
->fh
->fd
, (double)wcp
->offset
, (unsigned int)data_size
));
1010 if(data_size
== wcp
->alloc_size
) {
1011 DO_PROFILE_INC(writecache_num_perfect_writes
);
1015 ret
= real_write_file(NULL
, fsp
, wcp
->data
, wcp
->offset
, data_size
);
1018 * Ensure file size if kept up to date if write extends file.
1021 if ((ret
!= -1) && (wcp
->offset
+ ret
> wcp
->file_size
)) {
1022 wcp
->file_size
= wcp
->offset
+ ret
;
1028 /*******************************************************************
1030 ********************************************************************/
1032 NTSTATUS
sync_file(connection_struct
*conn
, files_struct
*fsp
, bool write_through
)
1034 if (fsp
->fh
->fd
== -1)
1035 return NT_STATUS_INVALID_HANDLE
;
1037 if (lp_strict_sync(SNUM(conn
)) &&
1038 (lp_syncalways(SNUM(conn
)) || write_through
)) {
1039 int ret
= flush_write_cache(fsp
, SYNC_FLUSH
);
1041 return map_nt_error_from_unix(errno
);
1043 ret
= SMB_VFS_FSYNC(fsp
);
1045 return map_nt_error_from_unix(errno
);
1048 return NT_STATUS_OK
;
1051 /************************************************************
1052 Perform a stat whether a valid fd or not.
1053 ************************************************************/
1055 int fsp_stat(files_struct
*fsp
)
1057 if (fsp
->fh
->fd
== -1) {
1058 if (fsp
->posix_open
) {
1059 return SMB_VFS_LSTAT(fsp
->conn
, fsp
->fsp_name
);
1061 return SMB_VFS_STAT(fsp
->conn
, fsp
->fsp_name
);
1064 return SMB_VFS_FSTAT(fsp
, &fsp
->fsp_name
->st
);