From: Eric Wong <e@yhbt.net>
Date: Wed, 29 Jul 2020 21:25:43 +0000 (+0000)
Subject: msgmap: disable CoW for tmp_clone, too
X-Git-Tag: v1.6.0~190
X-Git-Url: http://www.git.stargrave.org/?p=public-inbox.git;a=commitdiff_plain;h=ae6a9be7afc6902f9b8970b3656af241d6bc1d9f

msgmap: disable CoW for tmp_clone, too

The temporary clone starts as large as the full msgmap
and deletes will write to it randomly.  So ensure it
doesn't get fragmented and slower as time goes on.
---

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 51b6a68c..c85e7796 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -14,6 +14,7 @@ use DBI;
 use DBD::SQLite;
 use File::Temp qw(tempfile);
 use PublicInbox::Over;
+use PublicInbox::Spawn;
 
 sub new {
 	my ($class, $git_dir, $writable) = @_;
@@ -50,6 +51,7 @@ sub new_file {
 sub tmp_clone {
 	my ($self, $dir) = @_;
 	my ($fh, $fn) = tempfile('msgmap-XXXXXXXX', EXLOCK => 0, DIR => $dir);
+	PublicInbox::Spawn::set_nodatacow(fileno($fh));
 	my $tmp;
 	if ($self->{dbh}->can('sqlite_backup_to_dbh')) {
 		$tmp = ref($self)->new_file($fn, 2);