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Viewing changes to source4/ntvfs/posix/pvfs_write.c

  • Committer: Chuck Short
  • Date: 2010-09-28 20:38:39 UTC
  • Revision ID: zulcss@ubuntu.com-20100928203839-pgjulytsi9ue63x1
Initial version

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source4/ntvfs/posix/pvfs_write.c
 
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/* 
 
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   Unix SMB/CIFS implementation.
 
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   POSIX NTVFS backend - write
 
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   Copyright (C) Andrew Tridgell 2004
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; either version 3 of the License, or
 
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   (at your option) any later version.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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*/
 
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#include "includes.h"
 
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#include "vfs_posix.h"
 
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#include "librpc/gen_ndr/security.h"
 
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#include "lib/events/events.h"
 
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static void pvfs_write_time_update_handler(struct tevent_context *ev,
 
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                                           struct tevent_timer *te,
 
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                                           struct timeval tv,
 
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                                           void *private_data)
 
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{
 
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        struct pvfs_file_handle *h = talloc_get_type(private_data,
 
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                                     struct pvfs_file_handle);
 
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        struct odb_lock *lck;
 
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        NTSTATUS status;
 
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        NTTIME write_time;
 
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        lck = odb_lock(h, h->pvfs->odb_context, &h->odb_locking_key);
 
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        if (lck == NULL) {
 
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                DEBUG(0,("Unable to lock opendb for write time update\n"));
 
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                return;
 
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        }
 
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        write_time = timeval_to_nttime(&tv);
 
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        status = odb_set_write_time(lck, write_time, false);
 
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        if (!NT_STATUS_IS_OK(status)) {
 
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                DEBUG(0,("Unable to update write time: %s\n",
 
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                        nt_errstr(status)));
 
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                return;
 
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        }
 
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        talloc_free(lck);
 
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        h->write_time.update_event = NULL;
 
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}
 
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static void pvfs_trigger_write_time_update(struct pvfs_file_handle *h)
 
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{
 
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        struct pvfs_state *pvfs = h->pvfs;
 
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        struct timeval tv;
 
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        if (h->write_time.update_triggered) {
 
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                return;
 
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        }
 
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        tv = timeval_current_ofs(0, pvfs->writetime_delay);
 
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        h->write_time.update_triggered = true;
 
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        h->write_time.update_on_close = true;
 
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        h->write_time.update_event = event_add_timed(pvfs->ntvfs->ctx->event_ctx,
 
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                                                     h, tv,
 
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                                                     pvfs_write_time_update_handler,
 
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                                                     h);
 
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        if (!h->write_time.update_event) {
 
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                DEBUG(0,("Failed event_add_timed\n"));
 
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        }
 
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}
 
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/*
 
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  write to a file
 
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*/
 
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NTSTATUS pvfs_write(struct ntvfs_module_context *ntvfs,
 
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                    struct ntvfs_request *req, union smb_write *wr)
 
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{
 
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        struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
 
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                                  struct pvfs_state);
 
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        ssize_t ret;
 
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        struct pvfs_file *f;
 
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        NTSTATUS status;
 
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        if (wr->generic.level != RAW_WRITE_WRITEX) {
 
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                return ntvfs_map_write(ntvfs, req, wr);
 
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        }
 
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        f = pvfs_find_fd(pvfs, req, wr->writex.in.file.ntvfs);
 
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        if (!f) {
 
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                return NT_STATUS_INVALID_HANDLE;
 
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        }
 
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        if (f->handle->fd == -1) {
 
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                return NT_STATUS_INVALID_DEVICE_REQUEST;
 
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        }
 
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        if (!(f->access_mask & (SEC_FILE_WRITE_DATA | SEC_FILE_APPEND_DATA))) {
 
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                return NT_STATUS_ACCESS_DENIED;
 
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        }
 
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        status = pvfs_check_lock(pvfs, f, req->smbpid, 
 
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                                 wr->writex.in.offset,
 
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                                 wr->writex.in.count,
 
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                                 WRITE_LOCK);
 
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        NT_STATUS_NOT_OK_RETURN(status);
 
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        status = pvfs_break_level2_oplocks(f);
 
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        NT_STATUS_NOT_OK_RETURN(status);
 
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        pvfs_trigger_write_time_update(f->handle);
 
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        if (f->handle->name->stream_name) {
 
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                ret = pvfs_stream_write(pvfs,
 
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                                        f->handle,
 
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                                        wr->writex.in.data, 
 
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                                        wr->writex.in.count,
 
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                                        wr->writex.in.offset);
 
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        } else {
 
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#if HAVE_LINUX_AIO
 
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                /* possibly try an aio write */
 
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                if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
 
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                    (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
 
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                        status = pvfs_aio_pwrite(req, wr, f);
 
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                        if (NT_STATUS_IS_OK(status)) {
 
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                                return NT_STATUS_OK;
 
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                        }
 
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                }
 
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#endif
 
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                ret = pwrite(f->handle->fd, 
 
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                             wr->writex.in.data, 
 
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                             wr->writex.in.count,
 
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                             wr->writex.in.offset);
 
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        }
 
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        if (ret == -1) {
 
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                if (errno == EFBIG) {
 
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                        return NT_STATUS_INVALID_PARAMETER;
 
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                }
 
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                return pvfs_map_errno(pvfs, errno);
 
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        }
 
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        f->handle->seek_offset = wr->writex.in.offset + ret;
 
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        wr->writex.out.nwritten = ret;
 
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        wr->writex.out.remaining = 0; /* should fill this in? */
 
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        return NT_STATUS_OK;
 
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}