source4/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 "includes.h"
  24 #include "vfs_posix.h"
  25 #include "librpc/gen_ndr/security.h"
  26
  27
  28 /*
  29   write to a file
  30 */
  31 NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
  32                     struct ntvfs_request *req, union smb_write *wr)
  33 {
  34         struct pvfs_state *pvfs = ntvfs->private_data;
  35         ssize_t ret;
  36         struct pvfs_file *f;
  37         NTSTATUS status;
  38
  39         if (wr->generic.level != RAW_WRITE_WRITEX) {
  40                 return ntvfs_map_write(ntvfs, req, wr);
  41         }
  42
  43         f = pvfs_find_fd(pvfs, req, wr->writex.in.file.fnum);
  44         if (!f) {
  45                 return NT_STATUS_INVALID_HANDLE;
  46         }
  47
  48         if (f->handle->fd == -1) {
  49                 return NT_STATUS_FILE_IS_A_DIRECTORY;
  50         }
  51
  52         if (!(f->access_mask & (SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA))) {
  53                 return NT_STATUS_ACCESS_VIOLATION;
  54         }
  55
  56         status = pvfs_check_lock(pvfs, f, req->smbpid,
  57                                  wr->writex.in.offset,
  58                                  wr->writex.in.count,
  59                                  WRITE_LOCK);
  60         if (!NT_STATUS_IS_OK(status)) {
  61                 return status;
  62         }
  63
  64         if (f->handle->name->stream_name) {
  65                 ret = pvfs_stream_write(pvfs,
  66                                         f->handle,
  67                                         wr->writex.in.data,
  68                                         wr->writex.in.count,
  69                                         wr->writex.in.offset);
  70         } else {
  71                 ret = pwrite(f->handle->fd,
  72                              wr->writex.in.data,
  73                              wr->writex.in.count,
  74                              wr->writex.in.offset);
  75         }
  76         if (ret == -1) {
  77                 if (errno == EFBIG) {
  78                         return NT_STATUS_INVALID_PARAMETER;
  79                 }
  80                 return pvfs_map_errno(pvfs, errno);
  81         }
  82
  83         f->handle->seek_offset = wr->writex.in.offset + ret;
  84
  85         wr->writex.out.nwritten = ret;
  86         wr->writex.out.remaining = 0; /* should fill this in? */
  87
  88         return NT_STATUS_OK;
  89 }