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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2014-03-24 11:02:23 +0200 |
|---|---|---|
| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2014-03-24 11:02:23 +0200 |
| commit | 2f3afc09793da3a30f2878f34eda30a71060da7e (patch) | |
| tree | 56741e1ebe6810d6d0246f1458845ab228a91e45 /src | |
| parent | 3ed249b74133bc567a4efcfb90eb69d445097c1b (diff) | |
| download | postgresql-2f3afc09793da3a30f2878f34eda30a71060da7e.tar.gz postgresql-2f3afc09793da3a30f2878f34eda30a71060da7e.zip | |
Remove dead code and add comments.
'cbuffer' variable was left over from an earlier version of the patch to
rewrite the incomplete split handling.
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/nbtree/nbtxlog.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/src/backend/access/nbtree/nbtxlog.c b/src/backend/access/nbtree/nbtxlog.c index 665e60b7bd2..7e37a4ca58d 100644 --- a/src/backend/access/nbtree/nbtxlog.c +++ b/src/backend/access/nbtree/nbtxlog.c @@ -130,7 +130,6 @@ btree_xlog_insert(bool isleaf, bool ismeta, { xl_btree_insert *xlrec = (xl_btree_insert *) XLogRecGetData(record); Buffer buffer; - Buffer cbuffer = InvalidBuffer; Page page; char *datapos; int datalen; @@ -158,6 +157,15 @@ btree_xlog_insert(bool isleaf, bool ismeta, datalen -= sizeof(xl_btree_metadata); } + /* + * Insertion to an internal page finishes an incomplete split at the + * child level. Clear the incomplete-split flag in the child. Note: + * during normal operation, the child and parent pages are locked at the + * same time, so that clearing the flag and inserting the downlink appear + * atomic to other backends. We don't bother with that during replay, + * because readers don't care about the incomplete-split flag and there + * cannot be updates happening. + */ if (!isleaf) { if (record->xl_info & XLR_BKP_BLOCK(0)) @@ -194,9 +202,6 @@ btree_xlog_insert(bool isleaf, bool ismeta, } } - if (BufferIsValid(cbuffer)) - UnlockReleaseBuffer(cbuffer); - /* * Note: in normal operation, we'd update the metapage while still holding * lock on the page we inserted into. But during replay it's not @@ -273,7 +278,8 @@ btree_xlog_split(bool onleft, bool isroot, /* * Clear the incomplete split flag on the left sibling of the child page - * this is a downlink for. + * this is a downlink for. (Like in btree_xlog_insert, this can be done + * before locking the other pages) */ if (!isleaf) { |