lei: use RENAME_NOREPLACE on Linux 3.15+

One syscall is better than two for atomicity in Maildirs.  This
means there's no window where another process can see both the
old and new file at the same time (link && unlink), nor a window
where we might inadvertantly clobber an existing file if we were
to do `stat && rename'.

1 files changed, 46 insertions, 3 deletions

diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index 7ab42911..c00385b9 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -13,8 +13,9 @@
 # License or the Artistic License, as specified in the Perl README file.
 package PublicInbox::Syscall;
 use strict;
+use v5.10.1;
 use parent qw(Exporter);
-use POSIX qw(ENOSYS O_NONBLOCK);
+use POSIX qw(ENOENT EEXIST ENOSYS O_NONBLOCK);
 use Config;
 
 # $VERSION = '0.25'; # Sys::Syscall version
@@ -22,7 +23,7 @@ our @EXPORT_OK = qw(epoll_ctl epoll_create epoll_wait
                   EPOLLIN EPOLLOUT EPOLLET
                   EPOLL_CTL_ADD EPOLL_CTL_DEL EPOLL_CTL_MOD
                   EPOLLONESHOT EPOLLEXCLUSIVE
-                  signalfd);
+                  signalfd rename_noreplace);
 our %EXPORT_TAGS = (epoll => [qw(epoll_ctl epoll_create epoll_wait
                              EPOLLIN EPOLLOUT
                              EPOLL_CTL_ADD EPOLL_CTL_DEL EPOLL_CTL_MOD
@@ -64,13 +65,16 @@ our (
      $SYS_epoll_ctl,
      $SYS_epoll_wait,
      $SYS_signalfd4,
+     $SYS_renameat2,
      );
 
 my $SFD_CLOEXEC = 02000000; # Perl does not expose O_CLOEXEC
 our $no_deprecated = 0;
 
 if ($^O eq "linux") {
-    my $machine = (POSIX::uname())[-1];
+    my (undef, undef, $release, undef, $machine) = POSIX::uname();
+    my ($maj, $min) = ($release =~ /\A([0-9]+)\.([0-9]+)/);
+    $SYS_renameat2 = 0 if "$maj.$min" < 3.15;
     # whether the machine requires 64-bit numbers to be on 8-byte
     # boundaries.
     my $u64_mod_8 = 0;
@@ -91,22 +95,26 @@ if ($^O eq "linux") {
         $SYS_epoll_ctl    = 255;
         $SYS_epoll_wait   = 256;
         $SYS_signalfd4 = 327;
+        $SYS_renameat2 //= 353;
     } elsif ($machine eq "x86_64") {
         $SYS_epoll_create = 213;
         $SYS_epoll_ctl    = 233;
         $SYS_epoll_wait   = 232;
         $SYS_signalfd4 = 289;
+        $SYS_renameat2 //= 316;
     } elsif ($machine eq 'x32') {
         $SYS_epoll_create = 1073742037;
         $SYS_epoll_ctl = 1073742057;
         $SYS_epoll_wait = 1073742056;
         $SYS_signalfd4 = 1073742113;
+        $SYS_renameat2 //= 0x40000000 + 316;
     } elsif ($machine eq 'sparc64') {
         $SYS_epoll_create = 193;
         $SYS_epoll_ctl = 194;
         $SYS_epoll_wait = 195;
         $u64_mod_8 = 1;
         $SYS_signalfd4 = 317;
+        $SYS_renameat2 //= 345;
         $SFD_CLOEXEC = 020000000;
     } elsif ($machine =~ m/^parisc/) {
         $SYS_epoll_create = 224;
@@ -120,18 +128,21 @@ if ($^O eq "linux") {
         $SYS_epoll_wait   = 238;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 313;
+        $SYS_renameat2 //= 357;
     } elsif ($machine eq "ppc") {
         $SYS_epoll_create = 236;
         $SYS_epoll_ctl    = 237;
         $SYS_epoll_wait   = 238;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 313;
+        $SYS_renameat2 //= 357;
     } elsif ($machine =~ m/^s390/) {
         $SYS_epoll_create = 249;
         $SYS_epoll_ctl    = 250;
         $SYS_epoll_wait   = 251;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 322;
+        $SYS_renameat2 //= 347;
     } elsif ($machine eq "ia64") {
         $SYS_epoll_create = 1243;
         $SYS_epoll_ctl    = 1244;
@@ -153,6 +164,7 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $no_deprecated    = 1;
         $SYS_signalfd4 = 74;
+        $SYS_renameat2 //= 276;
     } elsif ($machine =~ m/arm(v\d+)?.*l/) {
         # ARM OABI
         $SYS_epoll_create = 250;
@@ -160,18 +172,21 @@ if ($^O eq "linux") {
         $SYS_epoll_wait   = 252;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 355;
+        $SYS_renameat2 //= 382;
     } elsif ($machine =~ m/^mips64/) {
         $SYS_epoll_create = 5207;
         $SYS_epoll_ctl    = 5208;
         $SYS_epoll_wait   = 5209;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 5283;
+        $SYS_renameat2 //= 5311;
     } elsif ($machine =~ m/^mips/) {
         $SYS_epoll_create = 4248;
         $SYS_epoll_ctl    = 4249;
         $SYS_epoll_wait   = 4250;
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 4324;
+        $SYS_renameat2 //= 4351;
     } else {
         # as a last resort, try using the *.ph files which may not
         # exist or may be wrong
@@ -280,6 +295,34 @@ sub signalfd ($$) {
         }
 }
 
+sub _rename_noreplace_racy ($$) {
+        my ($old, $new) = @_;
+        if (link($old, $new)) {
+                warn "unlink $old: $!\n" if !unlink($old) && $! != ENOENT;
+                1
+        } else {
+                undef;
+        }
+}
+
+# TODO: support FD args?
+sub rename_noreplace ($$) {
+        my ($old, $new) = @_;
+        if ($SYS_renameat2) { # RENAME_NOREPLACE = 1, AT_FDCWD = -100
+                my $ret = syscall($SYS_renameat2, -100, $old, -100, $new, 1);
+                if ($ret == 0) {
+                        1; # like rename() perlop
+                } elsif ($! == ENOSYS) {
+                        undef $SYS_renameat2;
+                        _rename_noreplace_racy($old, $new);
+                } else {
+                        undef
+                }
+        } else {
+                _rename_noreplace_racy($old, $new);
+        }
+}
+
 1;
 
 =head1 WARRANTY