diff options
Diffstat (limited to 'src/backend/storage/freespace/freespace.c')
| -rw-r--r-- | src/backend/storage/freespace/freespace.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/backend/storage/freespace/freespace.c b/src/backend/storage/freespace/freespace.c index b8fe0a3bf3e..4b6d92eb35a 100644 --- a/src/backend/storage/freespace/freespace.c +++ b/src/backend/storage/freespace/freespace.c @@ -8,7 +8,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.14 2002/09/20 19:56:01 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/freespace/freespace.c,v 1.15 2003/02/23 06:17:13 tgl Exp $ * * * NOTES: @@ -681,7 +681,9 @@ free_chunk_chain(FSMChunk *fchunk) * Look to see if a page with at least the specified amount of space is * available in the given FSMRelation. If so, return its page number, * and advance the nextPage counter so that the next inquiry will return - * a different page if possible. Return InvalidBlockNumber if no success. + * a different page if possible; also update the entry to show that the + * requested space is not available anymore. Return InvalidBlockNumber + * if no success. */ static BlockNumber find_free_space(FSMRelation *fsmrel, Size spaceNeeded) @@ -713,6 +715,12 @@ find_free_space(FSMRelation *fsmrel, Size spaceNeeded) /* Check the next page */ if ((Size) curChunk->bytes[chunkRelIndex] >= spaceNeeded) { + /* + * Found what we want --- adjust the entry. In theory we could + * delete the entry immediately if it drops below threshold, + * but it seems better to wait till we next need space. + */ + curChunk->bytes[chunkRelIndex] -= (ItemLength) spaceNeeded; fsmrel->nextPage = pageIndex + 1; return curChunk->pages[chunkRelIndex]; } |