Clean up memory leaks in LO operations by freeing LO's private
memory context at transaction commit or abort.
This commit is contained in:
Tom Lane
parent
81ced1e037
commit
2a44383a2d
src
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.36 1999/05/25 16:07:50 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.37 1999/05/31 22:53:59 tgl Exp $
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*
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* NOTES
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* Transaction aborts can now occur two ways:
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@ -156,8 +156,6 @@
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#include <miscadmin.h>
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#include <commands/async.h>
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#include <commands/sequence.h>
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/* included for _lo_commit [PA, 7/17/98] */
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#include <libpq/be-fsstubs.h>
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static void AbortTransaction(void);
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@ -938,7 +936,7 @@ CommitTransaction()
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*/
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/* handle commit for large objects [ PA, 7/17/98 ] */
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_lo_commit();
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lo_commit(true);
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/* NOTIFY commit must also come before lower-level cleanup */
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AtCommit_Notify();
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@ -1012,6 +1010,7 @@ AbortTransaction()
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* do abort processing
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* ----------------
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*/
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lo_commit(false); /* 'false' means it's abort */
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UnlockBuffers();
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AtAbort_Notify();
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CloseSequences();
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.33 1999/05/25 16:08:57 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.34 1999/05/31 22:53:57 tgl Exp $
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*
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* NOTES
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* This should be moved to a more appropriate place. It is here
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@ -15,10 +15,17 @@
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*
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* Builtin functions for open/close/read/write operations on large objects.
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*
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* These functions operate in the current portal variable context, which
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* means the large object descriptors hang around between transactions and
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* are not deallocated until explicitly closed, or until the portal is
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* closed.
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* These functions operate in a private GlobalMemoryContext, which means
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* that large object descriptors hang around until we destroy the context.
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* That happens in lo_commit(). It'd be possible to prolong the lifetime
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* of the context so that LO FDs are good across transactions (for example,
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* we could release the context only if we see that no FDs remain open).
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* But we'd need additional state in order to do the right thing at the
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* end of an aborted transaction. FDs opened during an aborted xact would
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* still need to be closed, since they might not be pointing at valid
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* relations at all. For now, we'll stick with the existing documented
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* semantics of LO FDs: they're only good within a transaction.
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*
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*-------------------------------------------------------------------------
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*/
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@ -37,6 +44,7 @@
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#include <utils/memutils.h>
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#include <lib/fstack.h>
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#include <utils/mcxt.h>
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#include <catalog/pg_shadow.h> /* for superuser() */
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#include <storage/fd.h> /* for O_ */
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#include <storage/large_object.h>
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#include <libpq/be-fsstubs.h>
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@ -91,6 +99,11 @@ lo_open(Oid lobjId, int mode)
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/* switch context back to orig. */
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MemoryContextSwitchTo(currentContext);
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#if FSDB
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if (fd < 0) /* newLOfd couldn't find a slot */
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elog(NOTICE, "Out of space for large object FDs");
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#endif
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return fd;
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}
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@ -144,6 +157,8 @@ lo_read(int fd, char *buf, int len)
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elog(ERROR, "lo_read: invalid large obj descriptor (%d)", fd);
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return -3;
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}
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Assert(fscxt != NULL);
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currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
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status = inv_read(cookies[fd], buf, len);
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@ -168,6 +183,8 @@ lo_write(int fd, char *buf, int len)
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elog(ERROR, "lo_write: invalid large obj descriptor (%d)", fd);
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return -3;
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}
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Assert(fscxt != NULL);
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currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
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status = inv_write(cookies[fd], buf, len);
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@ -181,7 +198,7 @@ int
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lo_lseek(int fd, int offset, int whence)
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{
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MemoryContext currentContext;
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int ret;
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int status;
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if (fd < 0 || fd >= MAX_LOBJ_FDS)
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{
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@ -194,13 +211,14 @@ lo_lseek(int fd, int offset, int whence)
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return -3;
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}
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Assert(fscxt != NULL);
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currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
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ret = inv_seek(cookies[fd], offset, whence);
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status = inv_seek(cookies[fd], offset, whence);
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MemoryContextSwitchTo(currentContext);
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return ret;
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return status;
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}
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Oid
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@ -246,12 +264,26 @@ lo_tell(int fd)
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elog(ERROR, "lo_tell: invalid large object descriptor (%d)", fd);
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return -3;
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}
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/*
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* We assume we do not need to switch contexts for inv_tell.
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* That is true for now, but is probably more than this module
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* ought to assume...
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*/
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return inv_tell(cookies[fd]);
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}
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int
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lo_unlink(Oid lobjId)
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{
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/*
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* inv_destroy does not need a context switch, indeed it doesn't
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* touch any LO-specific data structures at all. (Again, that's
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* probably more than this module ought to be assuming.)
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*
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* XXX there ought to be some code to clean up any open LOs that
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* reference the specified relation... as is, they remain "open".
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*/
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return inv_destroy(lobjId);
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}
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@ -297,16 +329,23 @@ lo_import(text *filename)
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File fd;
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int nbytes,
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tmp;
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char buf[BUFSIZE];
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char fnamebuf[FNAME_BUFSIZE];
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LargeObjectDesc *lobj;
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Oid lobjOid;
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if (!superuser())
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elog(ERROR, "You must have Postgres superuser privilege to use "
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"server-side lo_import().\n\tAnyone can use the "
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"client-side lo_import() provided by libpq.");
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/*
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* open the file to be read in
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*/
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StrNCpy(fnamebuf, VARDATA(filename), VARSIZE(filename) - VARHDRSZ + 1);
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nbytes = VARSIZE(filename) - VARHDRSZ + 1;
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if (nbytes > FNAME_BUFSIZE)
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nbytes = FNAME_BUFSIZE;
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StrNCpy(fnamebuf, VARDATA(filename), nbytes);
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#ifndef __CYGWIN32__
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fd = PathNameOpenFile(fnamebuf, O_RDONLY, 0666);
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#else
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@ -314,7 +353,7 @@ lo_import(text *filename)
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#endif
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if (fd < 0)
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{ /* error */
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elog(ERROR, "be_lo_import: can't open unix file \"%s\"\n",
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elog(ERROR, "lo_import: can't open unix file \"%s\": %m",
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fnamebuf);
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}
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@ -341,10 +380,8 @@ lo_import(text *filename)
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{
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tmp = inv_write(lobj, buf, nbytes);
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if (tmp < nbytes)
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{
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elog(ERROR, "lo_import: error while reading \"%s\"",
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fnamebuf);
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}
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}
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FileClose(fd);
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@ -363,12 +400,16 @@ lo_export(Oid lobjId, text *filename)
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File fd;
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int nbytes,
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tmp;
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char buf[BUFSIZE];
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char fnamebuf[FNAME_BUFSIZE];
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LargeObjectDesc *lobj;
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mode_t oumask;
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if (!superuser())
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elog(ERROR, "You must have Postgres superuser privilege to use "
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"server-side lo_export().\n\tAnyone can use the "
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"client-side lo_export() provided by libpq.");
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/*
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* open the inversion "object"
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*/
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@ -378,9 +419,16 @@ lo_export(Oid lobjId, text *filename)
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/*
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* open the file to be written to
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*
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* Note: we reduce backend's normal 077 umask to the slightly
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* friendlier 022. This code used to drop it all the way to 0,
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* but creating world-writable export files doesn't seem wise.
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*/
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StrNCpy(fnamebuf, VARDATA(filename), VARSIZE(filename) - VARHDRSZ + 1);
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oumask = umask((mode_t) 0);
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nbytes = VARSIZE(filename) - VARHDRSZ + 1;
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if (nbytes > FNAME_BUFSIZE)
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nbytes = FNAME_BUFSIZE;
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StrNCpy(fnamebuf, VARDATA(filename), nbytes);
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oumask = umask((mode_t) 0022);
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#ifndef __CYGWIN32__
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fd = PathNameOpenFile(fnamebuf, O_CREAT | O_WRONLY | O_TRUNC, 0666);
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#else
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@ -389,7 +437,7 @@ lo_export(Oid lobjId, text *filename)
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umask(oumask);
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if (fd < 0)
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{ /* error */
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elog(ERROR, "lo_export: can't open unix file \"%s\"",
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elog(ERROR, "lo_export: can't open unix file \"%s\": %m",
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fnamebuf);
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}
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@ -400,10 +448,8 @@ lo_export(Oid lobjId, text *filename)
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{
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tmp = FileWrite(fd, buf, nbytes);
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if (tmp < nbytes)
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{
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elog(ERROR, "lo_export: error while writing \"%s\"",
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fnamebuf);
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}
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}
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inv_close(lobj);
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@ -417,24 +463,34 @@ lo_export(Oid lobjId, text *filename)
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* prepares large objects for transaction commit [PA, 7/17/98]
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*/
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void
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_lo_commit(void)
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lo_commit(bool isCommit)
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{
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int i;
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MemoryContext currentContext;
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if (fscxt == NULL)
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return;
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return; /* no LO operations in this xact */
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currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
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/* Clean out still-open index scans (not necessary if aborting)
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* and clear cookies array so that LO fds are no longer good.
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*/
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for (i = 0; i < MAX_LOBJ_FDS; i++)
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{
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if (cookies[i] != NULL)
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inv_cleanindex(cookies[i]);
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{
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if (isCommit)
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inv_cleanindex(cookies[i]);
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cookies[i] = NULL;
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}
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}
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MemoryContextSwitchTo(currentContext);
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/* Release the LO memory context to prevent permanent memory leaks. */
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GlobalMemoryDestroy(fscxt);
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fscxt = NULL;
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}
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: be-fsstubs.h,v 1.8 1999/02/13 23:21:34 momjian Exp $
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* $Id: be-fsstubs.h,v 1.9 1999/05/31 22:53:58 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -40,6 +40,6 @@ extern int lowrite(int fd, struct varlena * wbuf);
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/*
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* Added for buffer leak prevention [ Pascal André <andre@via.ecp.fr> ]
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*/
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extern void _lo_commit(void);
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extern void lo_commit(bool isCommit);
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#endif /* BE_FSSTUBS_H */
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