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compact_fsm_storage() does need to handle the case where a relation's

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FSM data has to be both moved down and compressed.  Per report from
Dror Matalon.
This commit is contained in:
Tom Lane 2003-10-29 17:36:57 +00:00
parent d890c1d065
commit abec4cbf1f
1 changed files with 19 additions and 9 deletions
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28
src/backend/storage/freespace/freespace.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.23 2003/09/29 00:05:25 petere Exp $ * $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.24 2003/10/29 17:36:57 tgl Exp $
* *
* *
* NOTES: * NOTES:
@ -1432,19 +1432,29 @@ compact_fsm_storage(void)
/* /*
* It's possible that we have to move data down, not up, if the * It's possible that we have to move data down, not up, if the
* allocations of previous rels expanded. This should mean that * allocations of previous rels expanded. This normally means that
* our allocation expanded too (or at least got no worse), and * our allocation expanded too (or at least got no worse), and
* ditto for later rels. So there should be room --- but we might * ditto for later rels. So there should be room to move all our
* have to push down following rels to make it. We don't want to * data down without dropping any --- but we might have to push down
* do the push more than once, so pack everything against the end * following rels to acquire the room. We don't want to do the push
* of the arena if so. * more than once, so pack everything against the end of the arena
* if so.
*
* In corner cases where roundoff has affected our allocation, it's
* possible that we have to move down and compress our data too.
* Since this case is extremely infrequent, we do not try to be smart
* about it --- we just drop pages from the end of the rel's data.
*/ */
if (newChunkIndex > oldChunkIndex) if (newChunkIndex > oldChunkIndex)
{ {
int limitChunkIndex; int limitChunkIndex;
if (newAllocPages < fsmrel->storedPages) if (newAllocPages < fsmrel->storedPages)
elog(PANIC, "can't juggle and compress too"); {
/* move and compress --- just drop excess pages */
fsmrel->storedPages = newAllocPages;
curChunks = fsm_current_chunks(fsmrel);
}
if (fsmrel->nextPhysical != NULL) if (fsmrel->nextPhysical != NULL)
limitChunkIndex = fsmrel->nextPhysical->firstChunk; limitChunkIndex = fsmrel->nextPhysical->firstChunk;
else else
@ -1459,7 +1469,7 @@ compact_fsm_storage(void)
else else
limitChunkIndex = FreeSpaceMap->totalChunks; limitChunkIndex = FreeSpaceMap->totalChunks;
if (newChunkIndex + curChunks > limitChunkIndex) if (newChunkIndex + curChunks > limitChunkIndex)
elog(PANIC, "insufficient room"); elog(PANIC, "insufficient room in FSM");
} }
memmove(newLocation, oldLocation, curChunks * CHUNKBYTES); memmove(newLocation, oldLocation, curChunks * CHUNKBYTES);
} }
@ -1535,7 +1545,7 @@ push_fsm_rels_after(FSMRelation *afterRel)
if (newChunkIndex < oldChunkIndex) if (newChunkIndex < oldChunkIndex)
{ {
/* trouble... */ /* trouble... */
elog(PANIC, "out of room"); elog(PANIC, "insufficient room in FSM");
} }
else if (newChunkIndex > oldChunkIndex) else if (newChunkIndex > oldChunkIndex)
{ {