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During heap rebuild, lock any TOAST index until end of transaction.

swap_relation_files() calls toast_get_valid_index() to find and lockthis index, just before swapping with the rebuilt TOAST index. Thelatter function releases the lock before returning. Potential formischief is low; a concurrent session can issue ALTER INDEX ... SET(fillfactor = ...), which is not alarming. Nonetheless, changingpg_class.relfilenode without a lock is unconventional. Back-patch to9.5 (all supported versions), because another fix needs this.Discussion:https://postgr.es/m/20191226001521.GA1772687@rfd.leadboat.com

1 parentb350175 commit88b3a6cCopy full SHA for 88b3a6c

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2 files changed

-3

lines changed

src/backend
- access/heap
  - tuptoaster.c
- commands
  - cluster.c

2 files changed

-3

lines changed

`‎src/backend/access/heap/tuptoaster.c‎`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1436,8 +1436,8 @@ toast_get_valid_index(Oid toastoid, LOCKMODE lock)`
`1436`	`1436`	`validIndexOid=RelationGetRelid(toastidxs[validIndex]);`
`1437`	`1437`
`1438`	`1438`	`/* Close the toast relation and all its indexes */`
`1439`		`-toast_close_indexes(toastidxs,num_indexes,lock);`
`1440`		`-table_close(toastrel,lock);`
	`1439`	`+toast_close_indexes(toastidxs,num_indexes,NoLock);`
	`1440`	`+table_close(toastrel,NoLock);`
`1441`	`1441`
`1442`	`1442`	`returnvalidIndexOid;`
`1443`	`1443`	`}`

`‎src/backend/commands/cluster.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1490,7 +1490,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,`
`1490`	`1490`
`1491`	`1491`	`/* Get the associated valid index to be renamed */`
`1492`	`1492`	`toastidx=toast_get_valid_index(newrel->rd_rel->reltoastrelid,`
`1493`		`-AccessShareLock);`
	`1493`	`+NoLock);`
`1494`	`1494`
`1495`	`1495`	`/* rename the toast table ... */`
`1496`	`1496`	`snprintf(NewToastName,NAMEDATALEN,"pg_toast_%u",`

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Commit88b3a6c

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2 files changed

2 files changed

`‎src/backend/access/heap/tuptoaster.c‎`

`‎src/backend/commands/cluster.c‎`

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