C++ (Cpp) ntvfs_map_read Examples

Example #1

File: vfs_cifs.c Project: srimalik/samba

/*
  read from a file
*/
static NTSTATUS cvfs_read(struct ntvfs_module_context *ntvfs, 
			  struct ntvfs_request *req, union smb_read *io)
{
	struct cvfs_private *p = ntvfs->private_data;
	struct smbcli_request *c_req;

	SETUP_PID;

	if (io->generic.level != RAW_READ_GENERIC &&
	    p->map_generic) {
		return ntvfs_map_read(ntvfs, req, io);
	}

	SETUP_FILE;

	if (!(req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC)) {
		return smb_raw_read(p->tree, io);
	}

	c_req = smb_raw_read_send(p->tree, io);

	ASYNC_RECV_TAIL(io, async_read);
}

Example #2

File: pvfs_read.c Project: Alexandr-Galko/samba

/*
  read from a file
*/
NTSTATUS pvfs_read(struct ntvfs_module_context *ntvfs,
		   struct ntvfs_request *req, union smb_read *rd)
{
	struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
				  struct pvfs_state);
	ssize_t ret;
	struct pvfs_file *f;
	NTSTATUS status;
	uint32_t maxcnt;
	uint32_t mask;

	if (rd->generic.level != RAW_READ_READX) {
		return ntvfs_map_read(ntvfs, req, rd);
	}

	f = pvfs_find_fd(pvfs, req, rd->readx.in.file.ntvfs);
	if (!f) {
		return NT_STATUS_INVALID_HANDLE;
	}

	if (f->handle->fd == -1) {
		return NT_STATUS_INVALID_DEVICE_REQUEST;
	}

	mask = SEC_FILE_READ_DATA;
	if (rd->readx.in.read_for_execute) {
		mask |= SEC_FILE_EXECUTE;
	}
	if (!(f->access_mask & mask)) {
		return NT_STATUS_ACCESS_DENIED;
	}

	maxcnt = rd->readx.in.maxcnt;
	if (maxcnt > 2*UINT16_MAX && req->ctx->protocol < PROTOCOL_SMB2) {
		DEBUG(3,(__location__ ": Invalid SMB maxcnt 0x%x\n", maxcnt));
		return NT_STATUS_INVALID_PARAMETER;
	}

	status = pvfs_check_lock(pvfs, f, req->smbpid, 
				 rd->readx.in.offset,
				 maxcnt,
				 READ_LOCK);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	if (f->handle->name->stream_name) {
		ret = pvfs_stream_read(pvfs, f->handle, 
				       rd->readx.out.data, maxcnt, rd->readx.in.offset);
	} else {
#if HAVE_LINUX_AIO
		/* possibly try an aio read */
		if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
		    (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
			status = pvfs_aio_pread(req, rd, f, maxcnt);
			if (NT_STATUS_IS_OK(status)) {
				return NT_STATUS_OK;
			}
		}
#endif
		ret = pread(f->handle->fd, 
			    rd->readx.out.data, 
			    maxcnt,
			    rd->readx.in.offset);
	}
	if (ret == -1) {
		return pvfs_map_errno(pvfs, errno);
	}

	/* only SMB2 honors mincnt */
	if (req->ctx->protocol == PROTOCOL_SMB2) {
		if (rd->readx.in.mincnt > ret ||
		    (ret == 0 && maxcnt > 0)) {
			return NT_STATUS_END_OF_FILE;
		}
	}

	f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;

	rd->readx.out.nread = ret;
	rd->readx.out.remaining = 0xFFFF;
	rd->readx.out.compaction_mode = 0; 

	return NT_STATUS_OK;
}