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Move _bt_upgrademetapage() into critical section.

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Any changes on page should be done in critical section, so move
_bt_upgrademetapage into critical section. Improve comment. Found by Amit
Kapila during post-commit review of 857f9c36.

Author: Amit Kapila
This commit is contained in:
Teodor Sigaev 2018-05-30 19:45:39 +03:00
parent 3c9cf06945
commit 08186dc05b
3 changed files with 9 additions and 9 deletions
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8
src/backend/access/nbtree/nbtinsert.c
View File

@ -2150,10 +2150,6 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
metapg = BufferGetPage(metabuf);
metad = BTPageGetMeta(metapg);
/* upgrade metapage if needed */
if (metad->btm_version < BTREE_VERSION)
_bt_upgrademetapage(metapg);
/*
* Create downlink item for left page (old root). Since this will be the
* first item in a non-leaf page, it implicitly has minus-infinity key
@ -2178,6 +2174,10 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
/* NO EREPORT(ERROR) from here till newroot op is logged */
START_CRIT_SECTION();
/* upgrade metapage if needed */
if (metad->btm_version < BTREE_VERSION)
_bt_upgrademetapage(metapg);
/* set btree special data */
rootopaque = (BTPageOpaque) PageGetSpecialPointer(rootpage);
rootopaque->btpo_prev = rootopaque->btpo_next = P_NONE;

8
src/backend/access/nbtree/nbtpage.c
View File

@ -341,10 +341,6 @@ _bt_getroot(Relation rel, int access)
LockBuffer(metabuf, BUFFER_LOCK_UNLOCK);
LockBuffer(metabuf, BT_WRITE);
/* upgrade metapage if needed */
if (metad->btm_version < BTREE_VERSION)
_bt_upgrademetapage(metapg);
/*
* Race condition: if someone else initialized the metadata between
* the time we released the read lock and acquired the write lock, we
@ -379,6 +375,10 @@ _bt_getroot(Relation rel, int access)
/* NO ELOG(ERROR) till meta is updated */
START_CRIT_SECTION();
/* upgrade metapage if needed */
if (metad->btm_version < BTREE_VERSION)
_bt_upgrademetapage(metapg);
metad->btm_root = rootblkno;
metad->btm_level = 0;
metad->btm_fastroot = rootblkno;

2
src/include/access/nbtree.h
View File

@ -103,7 +103,7 @@ typedef struct BTMetaPageData
BlockNumber btm_fastroot; /* current "fast" root location */
uint32 btm_fastlevel; /* tree level of the "fast" root page */
/* following fields are available since page version 3 */
TransactionId btm_oldest_btpo_xact; /* oldest btpo_xact among of deleted
TransactionId btm_oldest_btpo_xact; /* oldest btpo_xact among all deleted
* pages */
float8 btm_last_cleanup_num_heap_tuples; /* number of heap tuples
* during last cleanup */