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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "vfs_posix.h"
  24 #include "librpc/gen_ndr/security.h"
  25
  26
  27 /*
  28   write to a file
  29 */
  30 NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
  31                     struct ntvfs_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         NTSTATUS status;
  37
  38         if (wr->generic.level != RAW_WRITE_WRITEX) {
  39                 return ntvfs_map_write(ntvfs, req, wr);
  40         }
  41
  42         f = pvfs_find_fd(pvfs, req, wr->writex.in.file.ntvfs);
  43         if (!f) {
  44                 return NT_STATUS_INVALID_HANDLE;
  45         }
  46
  47         if (f->handle->fd == -1) {
  48                 return NT_STATUS_FILE_IS_A_DIRECTORY;
  49         }
  50
  51         if (!(f->access_mask & (SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA))) {
  52                 return NT_STATUS_ACCESS_DENIED;
  53         }
  54
  55         status = pvfs_check_lock(pvfs, f, req->smbpid,
  56                                  wr->writex.in.offset,
  57                                  wr->writex.in.count,
  58                                  WRITE_LOCK);
  59         NT_STATUS_NOT_OK_RETURN(status);
  60
  61         status = pvfs_break_level2_oplocks(f);
  62         NT_STATUS_NOT_OK_RETURN(status);
  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 #if HAVE_LINUX_AIO
  72                 /* possibly try an aio write */
  73                 if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
  74                     (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
  75                         status = pvfs_aio_pwrite(req, wr, f);
  76                         if (NT_STATUS_IS_OK(status)) {
  77                                 return NT_STATUS_OK;
  78                         }
  79                 }
  80 #endif
  81                 ret = pwrite(f->handle->fd,
  82                              wr->writex.in.data,
  83                              wr->writex.in.count,
  84                              wr->writex.in.offset);
  85         }
  86         if (ret == -1) {
  87                 if (errno == EFBIG) {
  88                         return NT_STATUS_INVALID_PARAMETER;
  89                 }
  90                 return pvfs_map_errno(pvfs, errno);
  91         }
  92
  93         f->handle->seek_offset = wr->writex.in.offset + ret;
  94
  95         wr->writex.out.nwritten = ret;
  96         wr->writex.out.remaining = 0; /* should fill this in? */
  97
  98         return NT_STATUS_OK;
  99 }