* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.150 2009/08/05 18:01:54 heikki Exp $
+ * $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.151 2009/12/03 11:03:28 heikki Exp $
*
* NOTES:
*
#include "storage/fd.h"
#include "storage/ipc.h"
#include "utils/guc.h"
+#include "utils/resowner.h"
/*
{
int fd; /* current FD, or VFD_CLOSED if none */
unsigned short fdstate; /* bitflags for VFD's state */
- SubTransactionId create_subid; /* for TEMPORARY fds, creating subxact */
+ ResourceOwner resowner; /* owner, for automatic cleanup */
File nextFree; /* link to next free VFD, if in freelist */
File lruMoreRecently; /* doubly linked recency-of-use list */
File lruLessRecently;
vfdP->fileMode = fileMode;
vfdP->seekPos = 0;
vfdP->fdstate = 0x0;
+ vfdP->resowner = NULL;
return file;
}
* There's no need to pass in fileFlags or fileMode either, since only
* one setting makes any sense for a temp file.
*
- * interXact: if true, don't close the file at end-of-transaction. In
- * most cases, you don't want temporary files to outlive the transaction
- * that created them, so this should be false -- but if you need
- * "somewhat" temporary storage, this might be useful. In either case,
- * the file is removed when the File is explicitly closed.
+ * Unless interXact is true, the file is remembered by CurrentResourceOwner
+ * to ensure it's closed and deleted when it's no longer needed, typically at
+ * the end-of-transaction. In most cases, you don't want temporary files to
+ * outlive the transaction that created them, so this should be false -- but
+ * if you need "somewhat" temporary storage, this might be useful. In either
+ * case, the file is removed when the File is explicitly closed.
*/
File
OpenTemporaryFile(bool interXact)
/* Mark it for deletion at close */
VfdCache[file].fdstate |= FD_TEMPORARY;
- /* Mark it for deletion at EOXact */
+ /* Register it with the current resource owner */
if (!interXact)
{
VfdCache[file].fdstate |= FD_XACT_TEMPORARY;
- VfdCache[file].create_subid = GetCurrentSubTransactionId();
+
+ ResourceOwnerEnlargeFiles(CurrentResourceOwner);
+ ResourceOwnerRememberFile(CurrentResourceOwner, file);
+ VfdCache[file].resowner = CurrentResourceOwner;
/* ensure cleanup happens at eoxact */
have_xact_temporary_files = true;
elog(LOG, "could not unlink file \"%s\": %m", vfdP->fileName);
}
+ /* Unregister it from the resource owner */
+ if (vfdP->resowner)
+ ResourceOwnerForgetFile(vfdP->resowner, file);
+
/*
* Return the Vfd slot to the free list
*/
{
Index i;
- if (have_xact_temporary_files)
- {
- Assert(FileIsNotOpen(0)); /* Make sure ring not corrupted */
- for (i = 1; i < SizeVfdCache; i++)
- {
- unsigned short fdstate = VfdCache[i].fdstate;
-
- if ((fdstate & FD_XACT_TEMPORARY) &&
- VfdCache[i].create_subid == mySubid)
- {
- if (isCommit)
- VfdCache[i].create_subid = parentSubid;
- else if (VfdCache[i].fileName != NULL)
- FileClose(i);
- }
- }
- }
-
for (i = 0; i < numAllocatedDescs; i++)
{
if (allocatedDescs[i].create_subid == mySubid)
*
* This routine is called during transaction commit or abort (it doesn't
* particularly care which). All still-open per-transaction temporary file
- * VFDs are closed, which also causes the underlying files to be
- * deleted. Furthermore, all "allocated" stdio files are closed.
- * We also forget any transaction-local temp tablespace list.
+ * VFDs are closed, which also causes the underlying files to be deleted
+ * (although they should've been closed already by the ResourceOwner
+ * cleanup). Furthermore, all "allocated" stdio files are closed. We also
+ * forget any transaction-local temp tablespace list.
*/
void
AtEOXact_Files(void)
/*
* If we're in the process of exiting a backend process, close
* all temporary files. Otherwise, only close temporary files
- * local to the current transaction.
+ * local to the current transaction. They should be closed
+ * by the ResourceOwner mechanism already, so this is just
+ * a debugging cross-check.
*/
- if (isProcExit || (fdstate & FD_XACT_TEMPORARY))
+ if (isProcExit)
+ FileClose(i);
+ else if (fdstate & FD_XACT_TEMPORARY)
+ {
+ elog(WARNING,
+ "temporary file %s not closed at end-of-transaction",
+ VfdCache[i].fileName);
FileClose(i);
+ }
}
}
have_xact_temporary_files = false;
}
+ /* Clean up "allocated" stdio files and dirs. */
while (numAllocatedDescs > 0)
FreeDesc(&allocatedDescs[0]);
}
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/utils/resowner/resowner.c,v 1.32 2009/06/11 14:49:06 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/resowner/resowner.c,v 1.33 2009/12/03 11:03:29 heikki Exp $
*
*-------------------------------------------------------------------------
*/
int nsnapshots; /* number of owned snapshot references */
Snapshot *snapshots; /* dynamically allocated array */
int maxsnapshots; /* currently allocated array size */
+
+ /* We have built-in support for remembering open temporary files */
+ int nfiles; /* number of owned temporary files */
+ File *files; /* dynamically allocated array */
+ int maxfiles; /* currently allocated array size */
} ResourceOwnerData;
static void PrintPlanCacheLeakWarning(CachedPlan *plan);
static void PrintTupleDescLeakWarning(TupleDesc tupdesc);
static void PrintSnapshotLeakWarning(Snapshot snapshot);
+static void PrintFileLeakWarning(File file);
/*****************************************************************************
UnregisterSnapshot(owner->snapshots[owner->nsnapshots - 1]);
}
+ /* Ditto for temporary files */
+ while (owner->nfiles > 0)
+ {
+ if (isCommit)
+ PrintFileLeakWarning(owner->files[owner->nfiles - 1]);
+ FileClose(owner->files[owner->nfiles - 1]);
+ }
+
/* Clean up index scans too */
ReleaseResources_hash();
}
Assert(owner->nplanrefs == 0);
Assert(owner->ntupdescs == 0);
Assert(owner->nsnapshots == 0);
+ Assert(owner->nfiles == 0);
/*
* Delete children. The recursive call will delink the child from me, so
pfree(owner->tupdescs);
if (owner->snapshots)
pfree(owner->snapshots);
+ if (owner->files)
+ pfree(owner->files);
pfree(owner);
}
"Snapshot reference leak: Snapshot %p still referenced",
snapshot);
}
+
+
+/*
+ * Make sure there is room for at least one more entry in a ResourceOwner's
+ * files reference array.
+ *
+ * This is separate from actually inserting an entry because if we run out
+ * of memory, it's critical to do so *before* acquiring the resource.
+ */
+void
+ResourceOwnerEnlargeFiles(ResourceOwner owner)
+{
+ int newmax;
+
+ if (owner->nfiles < owner->maxfiles)
+ return; /* nothing to do */
+
+ if (owner->files == NULL)
+ {
+ newmax = 16;
+ owner->files = (File *)
+ MemoryContextAlloc(TopMemoryContext, newmax * sizeof(File));
+ owner->maxfiles = newmax;
+ }
+ else
+ {
+ newmax = owner->maxfiles * 2;
+ owner->files = (File *)
+ repalloc(owner->files, newmax * sizeof(File));
+ owner->maxfiles = newmax;
+ }
+}
+
+/*
+ * Remember that a temporary file is owned by a ResourceOwner
+ *
+ * Caller must have previously done ResourceOwnerEnlargeFiles()
+ */
+void
+ResourceOwnerRememberFile(ResourceOwner owner, File file)
+{
+ Assert(owner->nfiles < owner->maxfiles);
+ owner->files[owner->nfiles] = file;
+ owner->nfiles++;
+}
+
+/*
+ * Forget that a temporary file is owned by a ResourceOwner
+ */
+void
+ResourceOwnerForgetFile(ResourceOwner owner, File file)
+{
+ File *files = owner->files;
+ int ns1 = owner->nfiles - 1;
+ int i;
+
+ for (i = ns1; i >= 0; i--)
+ {
+ if (files[i] == file)
+ {
+ while (i < ns1)
+ {
+ files[i] = files[i + 1];
+ i++;
+ }
+ owner->nfiles = ns1;
+ return;
+ }
+ }
+ elog(ERROR, "temporery file %d is not owned by resource owner %s",
+ file, owner->name);
+}
+
+
+/*
+ * Debugging subroutine
+ */
+static void
+PrintFileLeakWarning(File file)
+{
+ elog(WARNING,
+ "temporary file leak: File %d still referenced",
+ file);
+}
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