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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-05-05 19:02:22 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-05-05 19:02:22 +0000 |
| commit | 2aa5ca952f085c5a469cf6b261f39439a22b5970 (patch) | |
| tree | d5a5d0ac7c1a502d334871df65c373012ef78824 | |
| parent | 40bc4c260508e8a2579bd2106e1f81b6795d147b (diff) | |
| download | postgresql-2aa5ca952f085c5a469cf6b261f39439a22b5970.tar.gz postgresql-2aa5ca952f085c5a469cf6b261f39439a22b5970.zip | |
Update comment for _bt_relandgetbuf.
| -rw-r--r-- | src/backend/access/nbtree/nbtpage.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c index bbac1627ef0..0dd4fdae79a 100644 --- a/src/backend/access/nbtree/nbtpage.c +++ b/src/backend/access/nbtree/nbtpage.c @@ -9,7 +9,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.112 2009/01/01 17:23:35 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/access/nbtree/nbtpage.c,v 1.113 2009/05/05 19:02:22 tgl Exp $ * * NOTES * Postgres btree pages look like ordinary relation pages. The opaque @@ -569,8 +569,12 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access) * This is equivalent to _bt_relbuf followed by _bt_getbuf, with the * exception that blkno may not be P_NEW. Also, if obuf is InvalidBuffer * then it reduces to just _bt_getbuf; allowing this case simplifies some - * callers. The motivation for using this is to avoid two entries to the - * bufmgr when one will do. + * callers. + * + * The original motivation for using this was to avoid two entries to the + * bufmgr when one would do. However, now it's mainly just a notational + * convenience. The only case where it saves work over _bt_relbuf/_bt_getbuf + * is when the target page is the same one already in the buffer. */ Buffer _bt_relandgetbuf(Relation rel, Buffer obuf, BlockNumber blkno, int access) |