source/ntvfs/posix/pvfs_write.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    POSIX NTVFS backend - write
   5
   6    Copyright (C) Andrew Tridgell 2004
   7
   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 2 of the License, or
  11    (at your option) any later version.
  12
  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.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "include/includes.h"
  24 #include "vfs_posix.h"
  25
  26
  27 /*
  28   write to a file
  29 */
  30 NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
  31                     struct smbsrv_request *req, union smb_write *wr)
  32 {
  33         struct pvfs_state *pvfs = ntvfs->private_data;
  34         ssize_t ret;
  35         struct pvfs_file *f;
  36
  37         switch (wr->generic.level) {
  38         case RAW_WRITE_WRITEX:
  39                 f = pvfs_find_fd(pvfs, req, wr->writex.in.fnum);
  40                 if (!f) {
  41                         return NT_STATUS_INVALID_HANDLE;
  42                 }
  43                 ret = pwrite(f->fd,
  44                              wr->writex.in.data,
  45                              wr->writex.in.count,
  46                              wr->writex.in.offset);
  47                 if (ret == -1) {
  48                         return map_nt_error_from_unix(errno);
  49                 }
  50
  51                 wr->writex.out.nwritten = ret;
  52                 wr->writex.out.remaining = 0; /* should fill this in? */
  53
  54                 return NT_STATUS_OK;
  55
  56         case RAW_WRITE_WRITE:
  57                 f = pvfs_find_fd(pvfs, req, wr->write.in.fnum);
  58                 if (!f) {
  59                         return NT_STATUS_INVALID_HANDLE;
  60                 }
  61                 if (wr->write.in.count == 0) {
  62                         /* a truncate! */
  63                         ret = ftruncate(f->fd, wr->write.in.offset);
  64                 } else {
  65                         ret = pwrite(f->fd,
  66                                      wr->write.in.data,
  67                                      wr->write.in.count,
  68                                      wr->write.in.offset);
  69                 }
  70                 if (ret == -1) {
  71                         return pvfs_map_errno(pvfs, errno);
  72                 }
  73
  74                 wr->write.out.nwritten = ret;
  75
  76                 return NT_STATUS_OK;
  77         }
  78
  79         return NT_STATUS_NOT_SUPPORTED;
  80 }