-/*
+/*
Unix SMB/Netbios implementation.
Version 1.9.
read/write to a files_struct
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2000-2002. - write cache.
-
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "printing.h"
+#include "smbd/smbd.h"
#include "smbd/globals.h"
-
-static bool setup_write_cache(files_struct *, SMB_OFF_T);
-
-/****************************************************************************
- Read from write cache if we can.
-****************************************************************************/
-
-static bool read_from_write_cache(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
-{
- write_cache *wcp = fsp->wcp;
-
- if(!wcp) {
- return False;
- }
-
- if( n > wcp->data_size || pos < wcp->offset || pos + n > wcp->offset + wcp->data_size) {
- return False;
- }
-
- memcpy(data, wcp->data + (pos - wcp->offset), n);
-
- DO_PROFILE_INC(writecache_read_hits);
-
- return True;
-}
+#include "smbprofile.h"
/****************************************************************************
Read from a file.
****************************************************************************/
-ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
+ssize_t read_file(files_struct *fsp,char *data,off_t pos,size_t n)
{
- ssize_t ret=0,readret;
+ off_t new_pos;
+ ssize_t ret = 0;
+ bool ok;
/* you can't read from print files */
if (fsp->print_file) {
return -1;
}
- /*
- * Serve from write cache if we can.
- */
-
- if(read_from_write_cache(fsp, data, pos, n)) {
- fsp->fh->pos = pos + n;
- fsp->fh->position_information = fsp->fh->pos;
- return n;
+ ok = vfs_valid_pread_range(pos, n);
+ if (!ok) {
+ errno = EINVAL;
+ return -1;
}
- flush_write_cache(fsp, READ_FLUSH);
-
- fsp->fh->pos = pos;
+ fh_set_pos(fsp->fh, pos);
if (n > 0) {
-#ifdef DMF_FIX
- int numretries = 3;
-tryagain:
- readret = SMB_VFS_PREAD(fsp,data,n,pos);
-
- if (readret == -1) {
- if ((errno == EAGAIN) && numretries) {
- DEBUG(3,("read_file EAGAIN retry in 10 seconds\n"));
- (void)sleep(10);
- --numretries;
- goto tryagain;
- }
- return -1;
- }
-#else /* NO DMF fix. */
- readret = SMB_VFS_PREAD(fsp,data,n,pos);
+ ret = SMB_VFS_PREAD(fsp,data,n,pos);
- if (readret == -1) {
+ if (ret == -1) {
return -1;
}
-#endif
- if (readret > 0) {
- ret += readret;
- }
}
DEBUG(10,("read_file (%s): pos = %.0f, size = %lu, returned %lu\n",
fsp_str_dbg(fsp), (double)pos, (unsigned long)n, (long)ret));
- fsp->fh->pos += ret;
- fsp->fh->position_information = fsp->fh->pos;
+ new_pos = fh_get_pos(fsp->fh) + ret;
+ fh_set_pos(fsp->fh, new_pos);
+ fh_set_position_information(fsp->fh, new_pos);
return(ret);
}
static ssize_t real_write_file(struct smb_request *req,
files_struct *fsp,
const char *data,
- SMB_OFF_T pos,
+ off_t pos,
size_t n)
{
ssize_t ret;
+ bool ok;
+
+ ok = vfs_valid_pwrite_range(pos, n);
+ if (!ok) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (n == 0) {
+ return 0;
+ }
- if (pos == -1) {
- ret = vfs_write_data(req, fsp, data, n);
- } else {
- fsp->fh->pos = pos;
- if (pos && lp_strict_allocate(SNUM(fsp->conn))) {
- if (vfs_fill_sparse(fsp, pos) == -1) {
- return -1;
- }
+ fh_set_pos(fsp->fh, pos);
+ if (pos &&
+ lp_strict_allocate(SNUM(fsp->conn)) &&
+ !fsp->fsp_flags.is_sparse)
+ {
+ if (vfs_fill_sparse(fsp, pos) == -1) {
+ return -1;
}
- ret = vfs_pwrite_data(req, fsp, data, n, pos);
}
+ ret = vfs_pwrite_data(req, fsp, data, n, pos);
DEBUG(10,("real_write_file (%s): pos = %.0f, size = %lu, returned %ld\n",
fsp_str_dbg(fsp), (double)pos, (unsigned long)n, (long)ret));
if (ret != -1) {
- fsp->fh->pos += ret;
+ off_t new_pos = fh_get_pos(fsp->fh) + ret;
+ fh_set_pos(fsp->fh, new_pos);
/* Yes - this is correct - writes don't update this. JRA. */
/* Found by Samba4 tests. */
return ret;
}
-/****************************************************************************
- File size cache change.
- Updates size on disk but doesn't flush the cache.
-****************************************************************************/
-
-static int wcp_file_size_change(files_struct *fsp)
+void fsp_flush_write_time_update(struct files_struct *fsp)
{
- int ret;
- write_cache *wcp = fsp->wcp;
-
- wcp->file_size = wcp->offset + wcp->data_size;
- ret = SMB_VFS_FTRUNCATE(fsp, wcp->file_size);
- if (ret == -1) {
- DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f "
- "error %s\n", fsp_str_dbg(fsp),
- (double)wcp->file_size, strerror(errno)));
- }
- return ret;
+ /*
+ * Note this won't expect any impersonation!
+ * So don't call any SMB_VFS operations here!
+ */
+
+ DEBUG(5, ("Update write time on %s\n", fsp_str_dbg(fsp)));
+
+ trigger_write_time_update_immediate(fsp);
}
-void update_write_time_handler(struct event_context *ctx,
- struct timed_event *te,
+static void update_write_time_handler(struct tevent_context *ctx,
+ struct tevent_timer *te,
struct timeval now,
void *private_data)
{
files_struct *fsp = (files_struct *)private_data;
-
- DEBUG(5, ("Update write time on %s\n", fsp_str_dbg(fsp)));
-
- /* change the write time in the open file db. */
- (void)set_write_time(fsp->file_id, timespec_current());
-
- /* And notify. */
- notify_fname(fsp->conn, NOTIFY_ACTION_MODIFIED,
- FILE_NOTIFY_CHANGE_LAST_WRITE, fsp->fsp_name->base_name);
-
- /* Remove the timed event handler. */
- TALLOC_FREE(fsp->update_write_time_event);
+ fsp_flush_write_time_update(fsp);
}
/*********************************************************
{
int delay;
- if (fsp->posix_open) {
+ if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
/* Don't use delayed writes on POSIX files. */
return;
}
- if (fsp->write_time_forced) {
+ if (fsp->fsp_flags.write_time_forced) {
/* No point - "sticky" write times
* in effect.
*/
/* We need to remember someone did a write
* and update to current time on close. */
- fsp->update_write_time_on_close = true;
+ fsp->fsp_flags.update_write_time_on_close = true;
- if (fsp->update_write_time_triggered) {
+ if (fsp->fsp_flags.update_write_time_triggered) {
/*
* We only update the write time after 2 seconds
* on the first normal write. After that
*/
return;
}
- fsp->update_write_time_triggered = true;
+ fsp->fsp_flags.update_write_time_triggered = true;
delay = lp_parm_int(SNUM(fsp->conn),
"smbd", "writetimeupdatedelay",
/* trigger the update 2 seconds later */
fsp->update_write_time_event =
- event_add_timed(smbd_event_context(), NULL,
- timeval_current_ofs(0, delay),
- update_write_time_handler, fsp);
+ tevent_add_timer(fsp->conn->sconn->ev_ctx, NULL,
+ timeval_current_ofs_usec(delay),
+ update_write_time_handler, fsp);
}
void trigger_write_time_update_immediate(struct files_struct *fsp)
{
struct smb_file_time ft;
- if (fsp->posix_open) {
+ init_smb_file_time(&ft);
+
+ if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
/* Don't use delayed writes on POSIX files. */
return;
}
- if (fsp->write_time_forced) {
+ if (fsp->fsp_flags.write_time_forced) {
/*
* No point - "sticky" write times
* in effect.
fsp_str_dbg(fsp)));
/* After an immediate update, reset the trigger. */
- fsp->update_write_time_triggered = true;
- fsp->update_write_time_on_close = false;
+ fsp->fsp_flags.update_write_time_triggered = true;
+ fsp->fsp_flags.update_write_time_on_close = false;
- ZERO_STRUCT(ft);
ft.mtime = timespec_current();
/* Update the time in the open file db. */
(void)smb_set_file_time(fsp->conn, fsp, fsp->fsp_name, &ft, false);
}
+void mark_file_modified(files_struct *fsp)
+{
+ int dosmode;
+
+ trigger_write_time_update(fsp);
+
+ if (fsp->fsp_flags.modified) {
+ return;
+ }
+
+ fsp->fsp_flags.modified = true;
+
+ if (!(lp_store_dos_attributes(SNUM(fsp->conn)) ||
+ MAP_ARCHIVE(fsp->conn))) {
+ return;
+ }
+
+ dosmode = fdos_mode(fsp);
+ if (dosmode & FILE_ATTRIBUTE_ARCHIVE) {
+ return;
+ }
+ file_set_dosmode(fsp->conn, fsp->fsp_name,
+ dosmode | FILE_ATTRIBUTE_ARCHIVE, NULL, false);
+}
+
/****************************************************************************
Write to a file.
****************************************************************************/
ssize_t write_file(struct smb_request *req,
files_struct *fsp,
const char *data,
- SMB_OFF_T pos,
+ off_t pos,
size_t n)
{
- write_cache *wcp = fsp->wcp;
ssize_t total_written = 0;
- int write_path = -1;
if (fsp->print_file) {
uint32_t t;
return t;
}
- if (!fsp->can_write) {
+ if (!fsp->fsp_flags.can_write) {
errno = EPERM;
return -1;
}
- if (!fsp->modified) {
- fsp->modified = True;
-
- if (SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st) == 0) {
- trigger_write_time_update(fsp);
- if (!fsp->posix_open &&
- (lp_store_dos_attributes(SNUM(fsp->conn)) ||
- MAP_ARCHIVE(fsp->conn))) {
- int dosmode = dos_mode(fsp->conn, fsp->fsp_name);
- if (!IS_DOS_ARCHIVE(dosmode)) {
- file_set_dosmode(fsp->conn, fsp->fsp_name,
- dosmode | aARCH, NULL, false);
- }
- }
-
- /*
- * If this is the first write and we have an exclusive oplock then setup
- * the write cache.
- */
-
- if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && !wcp) {
- setup_write_cache(fsp,
- fsp->fsp_name->st.st_ex_size);
- wcp = fsp->wcp;
- }
- }
- }
-
-#ifdef WITH_PROFILE
- DO_PROFILE_INC(writecache_total_writes);
- if (!fsp->oplock_type) {
- DO_PROFILE_INC(writecache_non_oplock_writes);
- }
-#endif
+ mark_file_modified(fsp);
/*
* If this file is level II oplocked then we need
contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
-#ifdef WITH_PROFILE
- if (profile_p && profile_p->writecache_total_writes % 500 == 0) {
- DEBUG(3,("WRITECACHE: initwrites=%u abutted=%u total=%u \
-nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
- profile_p->writecache_init_writes,
- profile_p->writecache_abutted_writes,
- profile_p->writecache_total_writes,
- profile_p->writecache_non_oplock_writes,
- profile_p->writecache_allocated_write_caches,
- profile_p->writecache_num_write_caches,
- profile_p->writecache_direct_writes,
- profile_p->writecache_num_perfect_writes,
- profile_p->writecache_read_hits ));
-
- DEBUG(3,("WRITECACHE: Flushes SEEK=%d, READ=%d, WRITE=%d, READRAW=%d, OPLOCK=%d, CLOSE=%d, SYNC=%d\n",
- profile_p->writecache_flushed_writes[SEEK_FLUSH],
- profile_p->writecache_flushed_writes[READ_FLUSH],
- profile_p->writecache_flushed_writes[WRITE_FLUSH],
- profile_p->writecache_flushed_writes[READRAW_FLUSH],
- profile_p->writecache_flushed_writes[OPLOCK_RELEASE_FLUSH],
- profile_p->writecache_flushed_writes[CLOSE_FLUSH],
- profile_p->writecache_flushed_writes[SYNC_FLUSH] ));
- }
-#endif
-
- if (wcp && req->unread_bytes) {
- /* If we're using receivefile don't
- * deal with a write cache.
- */
- flush_write_cache(fsp, WRITE_FLUSH);
- delete_write_cache(fsp);
- wcp = NULL;
- }
-
- if(!wcp) {
- DO_PROFILE_INC(writecache_direct_writes);
- total_written = real_write_file(req, fsp, data, pos, n);
- return total_written;
- }
-
- DEBUG(9,("write_file (%s)(fd=%d pos=%.0f size=%u) wcp->offset=%.0f "
- "wcp->data_size=%u\n", fsp_str_dbg(fsp), fsp->fh->fd,
- (double)pos, (unsigned int)n, (double)wcp->offset,
- (unsigned int)wcp->data_size));
-
- fsp->fh->pos = pos + n;
-
- if ((n == 1) && (data[0] == '\0') && (pos > wcp->file_size)) {
- int ret;
-
- /*
- * This is a 1-byte write of a 0 beyond the EOF and
- * thus implicitly also beyond the current active
- * write cache, the typical file-extending (and
- * allocating, but we're using the write cache here)
- * write done by Windows. We just have to ftruncate
- * the file and rely on posix semantics to return
- * zeros for non-written file data that is within the
- * file length.
- *
- * We can not use wcp_file_size_change here because we
- * might have an existing write cache, and
- * wcp_file_size_change assumes a change to just the
- * end of the current write cache.
- */
-
- wcp->file_size = pos + 1;
- ret = SMB_VFS_FTRUNCATE(fsp, wcp->file_size);
- if (ret == -1) {
- DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f"
- "error %s\n", fsp_str_dbg(fsp),
- (double)wcp->file_size, strerror(errno)));
- return -1;
- }
- return 1;
- }
-
-
- /*
- * If we have active cache and it isn't contiguous then we flush.
- * NOTE: There is a small problem with running out of disk ....
- */
-
- if (wcp->data_size) {
- bool cache_flush_needed = False;
-
- if ((pos >= wcp->offset) && (pos <= wcp->offset + wcp->data_size)) {
-
- /* ASCII art.... JRA.
-
- +--------------+-----
- | Cached data | Rest of allocated cache buffer....
- +--------------+-----
-
- +-------------------+
- | Data to write |
- +-------------------+
-
- */
-
- /*
- * Start of write overlaps or abutts the existing data.
- */
-
- size_t data_used = MIN((wcp->alloc_size - (pos - wcp->offset)), n);
-
- memcpy(wcp->data + (pos - wcp->offset), data, data_used);
-
- /*
- * Update the current buffer size with the new data.
- */
-
- if(pos + data_used > wcp->offset + wcp->data_size) {
- wcp->data_size = pos + data_used - wcp->offset;
- }
-
- /*
- * Update the file size if changed.
- */
-
- if (wcp->offset + wcp->data_size > wcp->file_size) {
- if (wcp_file_size_change(fsp) == -1) {
- return -1;
- }
- }
-
- /*
- * If we used all the data then
- * return here.
- */
-
- if(n == data_used) {
- return n;
- } else {
- cache_flush_needed = True;
- }
- /*
- * Move the start of data forward by the amount used,
- * cut down the amount left by the same amount.
- */
-
- data += data_used;
- pos += data_used;
- n -= data_used;
-
- DO_PROFILE_INC(writecache_abutted_writes);
- total_written = data_used;
-
- write_path = 1;
-
- } else if ((pos < wcp->offset) && (pos + n > wcp->offset) &&
- (pos + n <= wcp->offset + wcp->alloc_size)) {
-
- /* ASCII art.... JRA.
-
- +---------------+
- | Cache buffer |
- +---------------+
-
- +-------------------+
- | Data to write |
- +-------------------+
-
- */
-
- /*
- * End of write overlaps the existing data.
- */
-
- size_t data_used = pos + n - wcp->offset;
-
- memcpy(wcp->data, data + n - data_used, data_used);
-
- /*
- * Update the current buffer size with the new data.
- */
-
- if(pos + n > wcp->offset + wcp->data_size) {
- wcp->data_size = pos + n - wcp->offset;
- }
-
- /*
- * Update the file size if changed.
- */
-
- if (wcp->offset + wcp->data_size > wcp->file_size) {
- if (wcp_file_size_change(fsp) == -1) {
- return -1;
- }
- }
-
- /*
- * We don't need to move the start of data, but we
- * cut down the amount left by the amount used.
- */
-
- n -= data_used;
-
- /*
- * We cannot have used all the data here.
- */
-
- cache_flush_needed = True;
-
- DO_PROFILE_INC(writecache_abutted_writes);
- total_written = data_used;
-
- write_path = 2;
-
- } else if ( (pos >= wcp->file_size) &&
- (wcp->offset + wcp->data_size == wcp->file_size) &&
- (pos > wcp->offset + wcp->data_size) &&
- (pos < wcp->offset + wcp->alloc_size) ) {
-
- /* ASCII art.... JRA.
-
- End of file ---->|
-
- +---------------+---------------+
- | Cached data | Cache buffer |
- +---------------+---------------+
-
- +-------------------+
- | Data to write |
- +-------------------+
-
- */
-
- /*
- * Non-contiguous write part of which fits within
- * the cache buffer and is extending the file
- * and the cache contents reflect the current
- * data up to the current end of the file.
- */
-
- size_t data_used;
-
- if(pos + n <= wcp->offset + wcp->alloc_size) {
- data_used = n;
- } else {
- data_used = wcp->offset + wcp->alloc_size - pos;
- }
-
- /*
- * Fill in the non-continuous area with zeros.
- */
-
- memset(wcp->data + wcp->data_size, '\0',
- pos - (wcp->offset + wcp->data_size) );
-
- memcpy(wcp->data + (pos - wcp->offset), data, data_used);
-
- /*
- * Update the current buffer size with the new data.
- */
-
- if(pos + data_used > wcp->offset + wcp->data_size) {
- wcp->data_size = pos + data_used - wcp->offset;
- }
-
- /*
- * Update the file size if changed.
- */
-
- if (wcp->offset + wcp->data_size > wcp->file_size) {
- if (wcp_file_size_change(fsp) == -1) {
- return -1;
- }
- }
-
- /*
- * If we used all the data then
- * return here.
- */
-
- if(n == data_used) {
- return n;
- } else {
- cache_flush_needed = True;
- }
-
- /*
- * Move the start of data forward by the amount used,
- * cut down the amount left by the same amount.
- */
-
- data += data_used;
- pos += data_used;
- n -= data_used;
-
- DO_PROFILE_INC(writecache_abutted_writes);
- total_written = data_used;
-
- write_path = 3;
-
- } else if ( (pos >= wcp->file_size) &&
- (n == 1) &&
- (wcp->file_size == wcp->offset + wcp->data_size) &&
- (pos < wcp->file_size + wcp->alloc_size)) {
-
- /*
-
- End of file ---->|
-
- +---------------+---------------+
- | Cached data | Cache buffer |
- +---------------+---------------+
-
- |<------- allocated size ---------------->|
-
- +--------+
- | 1 Byte |
- +--------+
-
- MS-Office seems to do this a lot to determine if there's enough
- space on the filesystem to write a new file.
-
- Change to :
-
- End of file ---->|
- +-----------------------+--------+
- | Zeroed Cached data | 1 Byte |
- +-----------------------+--------+
- */
-
- flush_write_cache(fsp, WRITE_FLUSH);
- wcp->offset = wcp->file_size;
- wcp->data_size = pos - wcp->file_size + 1;
- memset(wcp->data, '\0', wcp->data_size);
- memcpy(wcp->data + wcp->data_size-1, data, 1);
-
- /*
- * Update the file size if changed.
- */
-
- if (wcp->offset + wcp->data_size > wcp->file_size) {
- if (wcp_file_size_change(fsp) == -1) {
- return -1;
- }
- }
-
- return n;
-
- } else {
-
- /* ASCII art..... JRA.
-
- Case 1).
-
- +---------------+---------------+
- | Cached data | Cache buffer |
- +---------------+---------------+
-
- +-------------------+
- | Data to write |
- +-------------------+
-
- Case 2).
-
- +---------------+---------------+
- | Cached data | Cache buffer |
- +---------------+---------------+
-
- +-------------------+
- | Data to write |
- +-------------------+
-
- Case 3).
-
- +---------------+---------------+
- | Cached data | Cache buffer |
- +---------------+---------------+
-
- +-----------------------------------------------------+
- | Data to write |
- +-----------------------------------------------------+
-
- */
-
- /*
- * Write is bigger than buffer, or there is no overlap on the
- * low or high ends.
- */
-
- DEBUG(9,("write_file: non cacheable write : fd = %d, pos = %.0f, len = %u, current cache pos = %.0f \
-len = %u\n",fsp->fh->fd, (double)pos, (unsigned int)n, (double)wcp->offset, (unsigned int)wcp->data_size ));
-
- /*
- * If write would fit in the cache, and is larger than
- * the data already in the cache, flush the cache and
- * preferentially copy the data new data into it. Otherwise
- * just write the data directly.
- */
-
- if ( n <= wcp->alloc_size && n > wcp->data_size) {
- cache_flush_needed = True;
- } else {
- ssize_t ret = real_write_file(NULL,fsp, data, pos, n);
-
- /*
- * If the write overlaps the entire cache, then
- * discard the current contents of the cache.
- * Fix from Rasmus Borup Hansen rbh@math.ku.dk.
- */
-
- if ((pos <= wcp->offset) &&
- (pos + n >= wcp->offset + wcp->data_size) ) {
- DEBUG(9,("write_file: discarding overwritten write \
-cache: fd = %d, off=%.0f, size=%u\n", fsp->fh->fd, (double)wcp->offset, (unsigned int)wcp->data_size ));
- wcp->data_size = 0;
- }
-
- DO_PROFILE_INC(writecache_direct_writes);
- if (ret == -1) {
- return ret;
- }
-
- if (pos + ret > wcp->file_size) {
- wcp->file_size = pos + ret;
- }
-
- return ret;
- }
-
- write_path = 4;
-
- }
-
- if (cache_flush_needed) {
- DEBUG(3,("WRITE_FLUSH:%d: due to noncontinuous write: fd = %d, size = %.0f, pos = %.0f, \
-n = %u, wcp->offset=%.0f, wcp->data_size=%u\n",
- write_path, fsp->fh->fd, (double)wcp->file_size, (double)pos, (unsigned int)n,
- (double)wcp->offset, (unsigned int)wcp->data_size ));
-
- flush_write_cache(fsp, WRITE_FLUSH);
- }
- }
-
- /*
- * If the write request is bigger than the cache
- * size, write it all out.
- */
-
- if (n > wcp->alloc_size ) {
- ssize_t ret = real_write_file(NULL,fsp, data, pos, n);
- if (ret == -1) {
- return -1;
- }
-
- if (pos + ret > wcp->file_size) {
- wcp->file_size = pos + n;
- }
-
- DO_PROFILE_INC(writecache_direct_writes);
- return total_written + n;
- }
-
- /*
- * If there's any data left, cache it.
- */
-
- if (n) {
-#ifdef WITH_PROFILE
- if (wcp->data_size) {
- DO_PROFILE_INC(writecache_abutted_writes);
- } else {
- DO_PROFILE_INC(writecache_init_writes);
- }
-#endif
-
- if ((wcp->data_size == 0)
- && (pos > wcp->file_size)
- && (pos + n <= wcp->file_size + wcp->alloc_size)) {
- /*
- * This is a write completely beyond the
- * current EOF, but within reach of the write
- * cache. We expect fill-up writes pretty
- * soon, so it does not make sense to start
- * the write cache at the current
- * offset. These fill-up writes would trigger
- * separate pwrites or even unnecessary cache
- * flushes because they overlap if this is a
- * one-byte allocating write.
- */
- wcp->offset = wcp->file_size;
- wcp->data_size = pos - wcp->file_size;
- memset(wcp->data, 0, wcp->data_size);
- }
-
- memcpy(wcp->data+wcp->data_size, data, n);
- if (wcp->data_size == 0) {
- wcp->offset = pos;
- DO_PROFILE_INC(writecache_num_write_caches);
- }
- wcp->data_size += n;
-
- /*
- * Update the file size if changed.
- */
-
- if (wcp->offset + wcp->data_size > wcp->file_size) {
- if (wcp_file_size_change(fsp) == -1) {
- return -1;
- }
- }
- DEBUG(9,("wcp->offset = %.0f wcp->data_size = %u cache return %u\n",
- (double)wcp->offset, (unsigned int)wcp->data_size, (unsigned int)n));
-
- total_written += n;
- return total_written; /* .... that's a write :) */
- }
-
+ total_written = real_write_file(req, fsp, data, pos, n);
return total_written;
}
-/****************************************************************************
- Delete the write cache structure.
-****************************************************************************/
-
-void delete_write_cache(files_struct *fsp)
-{
- write_cache *wcp;
-
- if(!fsp) {
- return;
- }
-
- if(!(wcp = fsp->wcp)) {
- return;
- }
-
- DO_PROFILE_DEC(writecache_allocated_write_caches);
- allocated_write_caches--;
-
- SMB_ASSERT(wcp->data_size == 0);
-
- SAFE_FREE(wcp->data);
- SAFE_FREE(fsp->wcp);
-
- DEBUG(10,("delete_write_cache: File %s deleted write cache\n",
- fsp_str_dbg(fsp)));
-}
-
-/****************************************************************************
- Setup the write cache structure.
-****************************************************************************/
-
-static bool setup_write_cache(files_struct *fsp, SMB_OFF_T file_size)
-{
- ssize_t alloc_size = lp_write_cache_size(SNUM(fsp->conn));
- write_cache *wcp;
-
- if (allocated_write_caches >= MAX_WRITE_CACHES) {
- return False;
- }
-
- if(alloc_size == 0 || fsp->wcp) {
- return False;
- }
-
- if((wcp = SMB_MALLOC_P(write_cache)) == NULL) {
- DEBUG(0,("setup_write_cache: malloc fail.\n"));
- return False;
- }
-
- wcp->file_size = file_size;
- wcp->offset = 0;
- wcp->alloc_size = alloc_size;
- wcp->data_size = 0;
- if((wcp->data = (char *)SMB_MALLOC(wcp->alloc_size)) == NULL) {
- DEBUG(0,("setup_write_cache: malloc fail for buffer size %u.\n",
- (unsigned int)wcp->alloc_size ));
- SAFE_FREE(wcp);
- return False;
- }
-
- memset(wcp->data, '\0', wcp->alloc_size );
-
- fsp->wcp = wcp;
- DO_PROFILE_INC(writecache_allocated_write_caches);
- allocated_write_caches++;
-
- DEBUG(10,("setup_write_cache: File %s allocated write cache size %lu\n",
- fsp_str_dbg(fsp), (unsigned long)wcp->alloc_size));
-
- return True;
-}
-
-/****************************************************************************
- Cope with a size change.
-****************************************************************************/
-
-void set_filelen_write_cache(files_struct *fsp, SMB_OFF_T file_size)
-{
- if(fsp->wcp) {
- /* The cache *must* have been flushed before we do this. */
- if (fsp->wcp->data_size != 0) {
- char *msg;
- if (asprintf(&msg, "set_filelen_write_cache: size change "
- "on file %s with write cache size = %lu\n",
- fsp->fsp_name->base_name,
- (unsigned long)fsp->wcp->data_size) != -1) {
- smb_panic(msg);
- } else {
- smb_panic("set_filelen_write_cache");
- }
- }
- fsp->wcp->file_size = file_size;
- }
-}
-
-/*******************************************************************
- Flush a write cache struct to disk.
-********************************************************************/
-
-ssize_t flush_write_cache(files_struct *fsp, enum flush_reason_enum reason)
-{
- write_cache *wcp = fsp->wcp;
- size_t data_size;
- ssize_t ret;
-
- if(!wcp || !wcp->data_size) {
- return 0;
- }
-
- data_size = wcp->data_size;
- wcp->data_size = 0;
-
- DO_PROFILE_DEC_INC(writecache_num_write_caches,writecache_flushed_writes[reason]);
-
- DEBUG(9,("flushing write cache: fd = %d, off=%.0f, size=%u\n",
- fsp->fh->fd, (double)wcp->offset, (unsigned int)data_size));
-
-#ifdef WITH_PROFILE
- if(data_size == wcp->alloc_size) {
- DO_PROFILE_INC(writecache_num_perfect_writes);
- }
-#endif
-
- ret = real_write_file(NULL, fsp, wcp->data, wcp->offset, data_size);
-
- /*
- * Ensure file size if kept up to date if write extends file.
- */
-
- if ((ret != -1) && (wcp->offset + ret > wcp->file_size)) {
- wcp->file_size = wcp->offset + ret;
- }
-
- return ret;
-}
-
/*******************************************************************
sync a file
********************************************************************/
NTSTATUS sync_file(connection_struct *conn, files_struct *fsp, bool write_through)
{
- if (fsp->fh->fd == -1)
+ if (fsp_get_io_fd(fsp) == -1)
return NT_STATUS_INVALID_HANDLE;
if (lp_strict_sync(SNUM(conn)) &&
- (lp_syncalways(SNUM(conn)) || write_through)) {
- int ret = flush_write_cache(fsp, SYNC_FLUSH);
- if (ret == -1) {
- return map_nt_error_from_unix(errno);
- }
- ret = SMB_VFS_FSYNC(fsp);
+ (lp_sync_always(SNUM(conn)) || write_through)) {
+ int ret;
+ ret = smb_vfs_fsync_sync(fsp);
if (ret == -1) {
return map_nt_error_from_unix(errno);
}
}
return NT_STATUS_OK;
}
-
-/************************************************************
- Perform a stat whether a valid fd or not.
-************************************************************/
-
-int fsp_stat(files_struct *fsp)
-{
- if (fsp->fh->fd == -1) {
- if (fsp->posix_open) {
- return SMB_VFS_LSTAT(fsp->conn, fsp->fsp_name);
- } else {
- return SMB_VFS_STAT(fsp->conn, fsp->fsp_name);
- }
- } else {
- return SMB_VFS_FSTAT(fsp, &fsp->fsp_name->st);
- }
-}
git.samba.org / samba.git / blobdiff