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Update comment for _bt_relandgetbuf.

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This commit is contained in:
Tom Lane 2009-05-05 19:02:22 +00:00
parent 40bc4c2605
commit 2aa5ca952f
1 changed files with 7 additions and 3 deletions
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10
src/backend/access/nbtree/nbtpage.c
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@ -9,7 +9,7 @@
* *
* *
* IDENTIFICATION * 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 * NOTES
* Postgres btree pages look like ordinary relation pages. The opaque * 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 * 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 * 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 * 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 * callers.
* bufmgr when one will do. *
* 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 Buffer
_bt_relandgetbuf(Relation rel, Buffer obuf, BlockNumber blkno, int access) _bt_relandgetbuf(Relation rel, Buffer obuf, BlockNumber blkno, int access)