/*
* ndmp_tar_writer
*
* The backup writer thread that writes the TAR records to the
* tape media (V2 only)
*/
int
ndmp_tar_writer(ndmpd_session_t *session, ndmpd_module_params_t *mod_params,
tlm_commands_t *cmds)
{
int bidx, nw;
int err;
tlm_buffer_t *buf;
tlm_buffers_t *bufs;
tlm_cmd_t *lcmd; /* Local command */
err = 0;
if (session == NULL) {
NDMP_LOG(LOG_DEBUG, "session == NULL");
err = -1;
} else if (mod_params == NULL) {
NDMP_LOG(LOG_DEBUG, "mod_params == NULL");
err = -1;
} else if (cmds == NULL) {
NDMP_LOG(LOG_DEBUG, "cmds == NULL");
err = -1;
}
if (err != 0)
return (err);
lcmd = cmds->tcs_command;
bufs = lcmd->tc_buffers;
lcmd->tc_ref++;
cmds->tcs_writer_count++;
nw = 0;
buf = tlm_buffer_out_buf(bufs, &bidx);
while (cmds->tcs_writer != (int)TLM_ABORT &&
lcmd->tc_writer != (int)TLM_ABORT) {
if (buf->tb_full) {
NDMP_LOG(LOG_DEBUG, "w%d", bidx);
if (MOD_WRITE(mod_params, buf->tb_buffer_data,
buf->tb_buffer_size) != 0) {
NDMP_LOG(LOG_DEBUG,
"Writing buffer %d, pos: %lld",
bidx, session->ns_mover.md_position);
err = -1;
break;
}
tlm_buffer_mark_empty(buf);
(void) tlm_buffer_advance_out_idx(bufs);
buf = tlm_buffer_out_buf(bufs, &bidx);
tlm_buffer_release_out_buf(bufs);
nw++;
} else {
if (lcmd->tc_writer != TLM_BACKUP_RUN) {
/* No more data is comming; time to exit. */
NDMP_LOG(LOG_DEBUG,
"tc_writer!=TLM_BACKUP_RUN; time to exit");
break;
} else {
NDMP_LOG(LOG_DEBUG, "W%d", bidx);
tlm_buffer_in_buf_timed_wait(bufs, 100);
}
}
}
NDMP_LOG(LOG_DEBUG, "nw: %d", nw);
if (cmds->tcs_writer != (int)TLM_ABORT) {
NDMP_LOG(LOG_DEBUG, "tcs_writer != TLM_ABORT");
} else {
NDMP_LOG(LOG_DEBUG, "tcs_writer == TLM_ABORT");
}
if (lcmd->tc_writer != (int)TLM_ABORT) {
NDMP_LOG(LOG_DEBUG, "tc_writer != TLM_ABORT");
} else {
NDMP_LOG(LOG_DEBUG, "tc_writer == TLM_ABORT");
}
cmds->tcs_writer_count--;
lcmd->tc_reader = TLM_STOP;
lcmd->tc_ref--;
return (err);
}
/*ARGSUSED*/
char *
tlm_get_read_buffer(int want, int *error,
tlm_buffers_t *buffers, int *actual_size)
{
tlm_buffer_t *buffer;
int align_size = RECORDSIZE - 1;
int buf;
int current_size;
char *rec;
buf = buffers->tbs_buffer_out;
buffer = &buffers->tbs_buffer[buf];
/*
* make sure the allocation is in chunks of 512 bytes
*/
want += align_size;
want &= ~align_size;
current_size = buffer->tb_buffer_size - buffer->tb_buffer_spot;
if (buffer->tb_full && current_size <= 0) {
/*
* no more data, release this
* one and go get another
*/
/*
* tell the reader that a buffer is available
*/
buffer->tb_full = FALSE;
tlm_buffer_release_out_buf(buffers);
buffer = tlm_buffer_advance_out_idx(buffers);
current_size = buffer->tb_buffer_size - buffer->tb_buffer_spot;
}
if (!buffer->tb_full) {
/*
* next buffer is not full yet.
* wait for the reader.
*/
tlm_buffer_in_buf_timed_wait(buffers, 500);
buffer = tlm_buffer_out_buf(buffers, NULL);
if (!buffer->tb_full) {
/*
* we do not have anything from the tape yet
*/
return (0);
}
current_size = buffer->tb_buffer_size - buffer->tb_buffer_spot;
}
/* Make sure we got something */
if (current_size <= 0)
return (NULL);
current_size = min(want, current_size);
rec = &buffer->tb_buffer_data[buffer->tb_buffer_spot];
buffer->tb_buffer_spot += current_size;
*actual_size = current_size;
/*
* the error flag is only sent back one time,
* since the flag refers to a previous read
* attempt, not the data in this buffer.
*/
*error = buffer->tb_errno;
return (rec);
}
