/*
* Writes state of a LogicalTapeSet to a state file
*/
static void DumpLogicalTapeSetState(ExecWorkFile *statefile, LogicalTapeSet *lts, LogicalTape *lt)
{
Assert(lts && lt && lt->frozen);
bool res = ExecWorkFile_Write(statefile, &(lts->nFileBlocks), sizeof(lts->nFileBlocks));
Assert(res);
res = ExecWorkFile_Write(statefile, &(lt->firstBlkNum), sizeof(lt->firstBlkNum));
Assert(res);
}
/*
* Write a block-sized buffer to the specified block of the underlying file.
*
* NB: should not attempt to write beyond current end of file (ie, create
* "holes" in file), since BufFile doesn't allow that. The first write pass
* must write blocks sequentially.
*
* No need for an error return convention; we ereport() on any error.
*/
static void
ltsWriteBlock(LogicalTapeSet *lts, int64 blocknum, void *buffer)
{
Assert(lts != NULL);
if (ExecWorkFile_Seek(lts->pfile, blocknum * BLCKSZ, SEEK_SET) != 0 ||
!ExecWorkFile_Write(lts->pfile, buffer, BLCKSZ))
{
ereport(ERROR,
/* XXX is it okay to assume errno is correct? */
(errcode_for_file_access(),
errmsg("could not write block " INT64_FORMAT " of temporary file: %m",
blocknum),
errhint("Perhaps out of disk space?")));
}
}
/*
* Save the serialized plan to a file in the workfile set.
* It will be used to do full plan matching before reusing.
*/
static void
workfile_mgr_save_plan(workfile_set *work_set, workfile_set_plan *sf_plan)
{
Assert(work_set);
Assert(sf_plan);
ExecWorkFile *plan_file = workfile_mgr_create_fileno(work_set, WORKFILE_NUM_ALL_PLAN);
insist_log(plan_file != NULL, "Could not create temporary work file: %m");
elog(gp_workfile_caching_loglevel, "Saving query plan to file %s", ExecWorkFile_GetFileName(plan_file));
bool res = ExecWorkFile_Write(plan_file, sf_plan->serialized_plan,
sf_plan->serialized_plan_len);
if(!res)
{
workfile_mgr_report_error();
}
workfile_mgr_close_file(work_set, plan_file);
}
