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 #include "lib/events/events.h"
  26
  27 static void pvfs_write_time_update_handler(struct tevent_context *ev,
  28                                            struct tevent_timer *te,
  29                                            struct timeval tv,
  30                                            void *private_data)
  31 {
  32         struct pvfs_file_handle *h = talloc_get_type(private_data,
  33                                      struct pvfs_file_handle);
  34         struct odb_lock *lck;
  35         NTSTATUS status;
  36         NTTIME write_time;
  37
  38         lck = odb_lock(h, h->pvfs->odb_context, &h->odb_locking_key);
  39         if (lck == NULL) {
  40                 DEBUG(0,("Unable to lock opendb for write time update\n"));
  41                 return;
  42         }
  43
  44         write_time = timeval_to_nttime(&tv);
  45
  46         status = odb_set_write_time(lck, write_time, false);
  47         if (!NT_STATUS_IS_OK(status)) {
  48                 DEBUG(0,("Unable to update write time: %s\n",
  49                         nt_errstr(status)));
  50                 return;
  51         }
  52
  53         talloc_free(lck);
  54
  55         h->write_time.update_event = NULL;
  56 }
  57
  58 static void pvfs_trigger_write_time_update(struct pvfs_file_handle *h)
  59 {
  60         struct pvfs_state *pvfs = h->pvfs;
  61         struct timeval tv;
  62
  63         if (h->write_time.update_triggered) {
  64                 return;
  65         }
  66
  67         tv = timeval_current_ofs_usec(pvfs->writetime_delay);
  68
  69         h->write_time.update_triggered = true;
  70         h->write_time.update_on_close = true;
  71         h->write_time.update_event = tevent_add_timer(pvfs->ntvfs->ctx->event_ctx,
  72                                                      h, tv,
  73                                                      pvfs_write_time_update_handler,
  74                                                      h);
  75         if (!h->write_time.update_event) {
  76                 DEBUG(0,("Failed tevent_add_timer\n"));
  77         }
  78 }
  79
  80 /*
  81   write to a file
  82 */
  83 NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
  84                     struct ntvfs_request *req, union smb_write *wr)
  85 {
  86         struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
  87                                   struct pvfs_state);
  88         ssize_t ret;
  89         struct pvfs_file *f;
  90         NTSTATUS status;
  91
  92         if (wr->generic.level != RAW_WRITE_WRITEX) {
  93                 return ntvfs_map_write(ntvfs, req, wr);
  94         }
  95
  96         f = pvfs_find_fd(pvfs, req, wr->writex.in.file.ntvfs);
  97         if (!f) {
  98                 return NT_STATUS_INVALID_HANDLE;
  99         }
 100
 101         if (f->handle->fd == -1) {
 102                 return NT_STATUS_INVALID_DEVICE_REQUEST;
 103         }
 104
 105         if (!(f->access_mask & (SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA))) {
 106                 return NT_STATUS_ACCESS_DENIED;
 107         }
 108
 109         status = pvfs_check_lock(pvfs, f, req->smbpid,
 110                                  wr->writex.in.offset,
 111                                  wr->writex.in.count,
 112                                  WRITE_LOCK);
 113         NT_STATUS_NOT_OK_RETURN(status);
 114
 115         status = pvfs_break_level2_oplocks(f);
 116         NT_STATUS_NOT_OK_RETURN(status);
 117
 118         pvfs_trigger_write_time_update(f->handle);
 119
 120         if (f->handle->name->stream_name) {
 121                 ret = pvfs_stream_write(pvfs,
 122                                         f->handle,
 123                                         wr->writex.in.data,
 124                                         wr->writex.in.count,
 125                                         wr->writex.in.offset);
 126         } else {
 127 #ifdef HAVE_LINUX_AIO
 128                 /* possibly try an aio write */
 129                 if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
 130                     (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
 131                         status = pvfs_aio_pwrite(req, wr, f);
 132                         if (NT_STATUS_IS_OK(status)) {
 133                                 return NT_STATUS_OK;
 134                         }
 135                 }
 136 #endif
 137                 ret = pwrite(f->handle->fd,
 138                              wr->writex.in.data,
 139                              wr->writex.in.count,
 140                              wr->writex.in.offset);
 141         }
 142         if (ret == -1) {
 143                 if (errno == EFBIG) {
 144                         return NT_STATUS_INVALID_PARAMETER;
 145                 }
 146                 return pvfs_map_errno(pvfs, errno);
 147         }
 148
 149         f->handle->seek_offset = wr->writex.in.offset + ret;
 150
 151         wr->writex.out.nwritten = ret;
 152         wr->writex.out.remaining = 0; /* should fill this in? */
 153
 154         return NT_STATUS_OK;
 155 }