コード例 #1
0
ファイル: localbuf.c プロジェクト: FilipinOTech/postgres
/*
 * DropRelFileNodeAllLocalBuffers
 *		This function removes from the buffer pool all pages of all forks
 *		of the specified relation.
 *
 *		See DropRelFileNodeAllBuffers in bufmgr.c for more notes.
 */
void
DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
{
	int			i;

	for (i = 0; i < NLocBuffer; i++)
	{
		BufferDesc *bufHdr = &LocalBufferDescriptors[i];
		LocalBufferLookupEnt *hresult;

		if ((bufHdr->flags & BM_TAG_VALID) &&
			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
		{
			if (LocalRefCount[i] != 0)
				elog(ERROR, "block %u of %s is still referenced (local %u)",
					 bufHdr->tag.blockNum,
					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
									bufHdr->tag.forkNum),
					 LocalRefCount[i]);
			/* Remove entry from hashtable */
			hresult = (LocalBufferLookupEnt *)
				hash_search(LocalBufHash, (void *) &bufHdr->tag,
							HASH_REMOVE, NULL);
			if (!hresult)		/* shouldn't happen */
				elog(ERROR, "local buffer hash table corrupted");
			/* Mark buffer invalid */
			CLEAR_BUFFERTAG(bufHdr->tag);
			bufHdr->flags = 0;
			bufHdr->usage_count = 0;
		}
	}
}
コード例 #2
0
ファイル: dbsize.c プロジェクト: pf-qiu/gpdb
/*
 * calculate size of (one fork of) a relation
 *
 * Iterator over all files belong to the relation and do stat.
 * The obviously better way is to use glob.  For whatever reason,
 * glob is extremely slow if there are lots of relations in the
 * database.  So we handle all cases, instead. 
 *
 * Note: we can safely apply this to temp tables of other sessions, so there
 * is no check here or at the call sites for that.
 */
static int64
calculate_relation_size(Relation rel, ForkNumber forknum)
{
	int64		totalsize = 0;
	char	   *relationpath;
	char		pathname[MAXPGPATH];
	unsigned int segcount = 0;

	relationpath = relpathbackend(rel->rd_node, rel->rd_backend, forknum);

if (RelationIsHeap(rel))
{
	/* Ordinary relation, including heap and index.
	 * They take form of relationpath, or relationpath.%d
	 * There will be no holes, therefore, we can stop when
	 * we reach the first non-existing file.
	 */
	for (segcount = 0;; segcount++)
	{
		struct stat fst;

		CHECK_FOR_INTERRUPTS();

		if (segcount == 0)
			snprintf(pathname, MAXPGPATH, "%s",
					 relationpath);
		else
			snprintf(pathname, MAXPGPATH, "%s.%u",
					 relationpath, segcount);

		if (stat(pathname, &fst) < 0)
		{
			if (errno == ENOENT)
				break;
			else
				ereport(ERROR,
						(errcode_for_file_access(),
						 errmsg("could not stat file %s: %m", pathname)));
		}
		totalsize += fst.st_size;
	}
}
/* AO tables don't have any extra forks. */
else if (forknum == MAIN_FORKNUM)
{
	if (RelationIsAoRows(rel))
	{
		totalsize = GetAOTotalBytes(rel, GetActiveSnapshot());
	}
	else if (RelationIsAoCols(rel))
	{
		totalsize = GetAOCSTotalBytes(rel, GetActiveSnapshot(), true);
	}
}

	/* RELSTORAGE_VIRTUAL has no space usage */
	return totalsize;
}
コード例 #3
0
ファイル: localbuf.c プロジェクト: Gordiychuk/postgres
/*
 * DropRelFileNodeLocalBuffers
 *		This function removes from the buffer pool all the pages of the
 *		specified relation that have block numbers >= firstDelBlock.
 *		(In particular, with firstDelBlock = 0, all pages are removed.)
 *		Dirty pages are simply dropped, without bothering to write them
 *		out first.  Therefore, this is NOT rollback-able, and so should be
 *		used only with extreme caution!
 *
 *		See DropRelFileNodeBuffers in bufmgr.c for more notes.
 */
void
DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
							BlockNumber firstDelBlock)
{
	int			i;

	for (i = 0; i < NLocBuffer; i++)
	{
		BufferDesc *bufHdr = GetLocalBufferDescriptor(i);
		LocalBufferLookupEnt *hresult;
		uint32		buf_state;

		buf_state = pg_atomic_read_u32(&bufHdr->state);

		if ((buf_state & BM_TAG_VALID) &&
			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
			bufHdr->tag.forkNum == forkNum &&
			bufHdr->tag.blockNum >= firstDelBlock)
		{
			if (LocalRefCount[i] != 0)
				elog(ERROR, "block %u of %s is still referenced (local %u)",
					 bufHdr->tag.blockNum,
					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
									bufHdr->tag.forkNum),
					 LocalRefCount[i]);
			/* Remove entry from hashtable */
			hresult = (LocalBufferLookupEnt *)
				hash_search(LocalBufHash, (void *) &bufHdr->tag,
							HASH_REMOVE, NULL);
			if (!hresult)		/* shouldn't happen */
				elog(ERROR, "local buffer hash table corrupted");
			/* Mark buffer invalid */
			CLEAR_BUFFERTAG(bufHdr->tag);
			buf_state &= ~BUF_FLAG_MASK;
			buf_state &= ~BUF_USAGECOUNT_MASK;
			pg_atomic_write_u32(&bufHdr->state, buf_state);
		}
	}
}
コード例 #4
0
ファイル: dbsize.c プロジェクト: bwright/postgres
/*
 * calculate size of (one fork of) a relation
 *
 * Note: we can safely apply this to temp tables of other sessions, so there
 * is no check here or at the call sites for that.
 */
static int64
calculate_relation_size(RelFileNode *rfn, BackendId backend, ForkNumber forknum)
{
	int64		totalsize = 0;
	char	   *relationpath;
	char		pathname[MAXPGPATH];
	unsigned int segcount = 0;

	relationpath = relpathbackend(*rfn, backend, forknum);

	for (segcount = 0;; segcount++)
	{
		struct stat fst;

		CHECK_FOR_INTERRUPTS();

		if (segcount == 0)
			snprintf(pathname, MAXPGPATH, "%s",
					 relationpath);
		else
			snprintf(pathname, MAXPGPATH, "%s.%u",
					 relationpath, segcount);

		if (stat(pathname, &fst) < 0)
		{
			if (errno == ENOENT)
				break;
			else
				ereport(ERROR,
						(errcode_for_file_access(),
						 errmsg("could not stat file \"%s\": %m", pathname)));
		}
		totalsize += fst.st_size;
	}

	return totalsize;
}