$dbw->begin( __METHOD__ );
if ( $id == 0 ) {
- $this->loadPageData( 'forupdate' );
+ // T98706: lock the page from various other updates but avoid using
+ // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
+ // the revisions queries (which also JOIN on user). Only lock the page
+ // row and CAS check on page_latest to see if the trx snapshot matches.
+ $latest = $this->lock();
+
+ $this->loadPageData( WikiPage::READ_LATEST );
$id = $this->getID();
- if ( $id == 0 ) {
+ if ( $id == 0 || $this->getLatest() != $latest ) {
+ // Page not there or trx snapshot is stale
$dbw->rollback( __METHOD__ );
$status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
return $status;
return $status;
}
+ /**
+ * Lock the page row for this title and return page_latest (or 0)
+ *
+ * @return integer
+ */
+ protected function lock() {
+ return (int)wfGetDB( DB_MASTER )->selectField(
+ 'page',
+ 'page_latest',
+ array(
+ 'page_namespace' => $this->getTitle()->getNamespace(),
+ 'page_title' => $this->getTitle()->getDBkey()
+ ),
+ __METHOD__,
+ array( 'FOR UPDATE' )
+ );
+ }
+
/**
* Do some database updates after deletion
*