X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSyscall.pm;h=a2b7490a574ae92b4b5cd01b57a73b65b2445488;hb=760c225c3831a9164f11ddf9d5318ad6c3f84bb8;hp=c00385b94db84b63facf7a8d57296ac76b3b1421;hpb=4cd7a78f3b8c03670e2d77675229472506eee1eb;p=public-inbox.git

diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index c00385b9..a2b7490a 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -5,7 +5,7 @@
 # This license differs from the rest of public-inbox
 #
 # This module is Copyright (c) 2005 Six Apart, Ltd.
-# Copyright (C) 2019-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 #
 # All rights reserved.
 #
@@ -15,7 +15,7 @@ package PublicInbox::Syscall;
 use strict;
 use v5.10.1;
 use parent qw(Exporter);
-use POSIX qw(ENOENT EEXIST ENOSYS O_NONBLOCK);
+use POSIX qw(ENOENT EEXIST ENOSYS EINVAL O_NONBLOCK);
 use Config;
 
 # $VERSION = '0.25'; # Sys::Syscall version
@@ -68,6 +68,8 @@ our (
      $SYS_renameat2,
      );
 
+my $SYS_fstatfs; # don't need fstatfs64, just statfs.f_type
+my ($FS_IOC_GETFLAGS, $FS_IOC_SETFLAGS);
 my $SFD_CLOEXEC = 02000000; # Perl does not expose O_CLOEXEC
 our $no_deprecated = 0;
 
@@ -96,18 +98,27 @@ if ($^O eq "linux") {
         $SYS_epoll_wait   = 256;
         $SYS_signalfd4 = 327;
         $SYS_renameat2 //= 353;
+	$SYS_fstatfs = 100;
+	$FS_IOC_GETFLAGS = 0x80046601;
+	$FS_IOC_SETFLAGS = 0x40046602;
     } elsif ($machine eq "x86_64") {
         $SYS_epoll_create = 213;
         $SYS_epoll_ctl    = 233;
         $SYS_epoll_wait   = 232;
         $SYS_signalfd4 = 289;
 	$SYS_renameat2 //= 316;
+	$SYS_fstatfs = 138;
+	$FS_IOC_GETFLAGS = 0x80086601;
+	$FS_IOC_SETFLAGS = 0x40086602;
     } elsif ($machine eq 'x32') {
         $SYS_epoll_create = 1073742037;
         $SYS_epoll_ctl = 1073742057;
         $SYS_epoll_wait = 1073742056;
         $SYS_signalfd4 = 1073742113;
 	$SYS_renameat2 //= 0x40000000 + 316;
+	$SYS_fstatfs = 138;
+	$FS_IOC_GETFLAGS = 0x80046601;
+	$FS_IOC_SETFLAGS = 0x40046602;
     } elsif ($machine eq 'sparc64') {
 	$SYS_epoll_create = 193;
 	$SYS_epoll_ctl = 194;
@@ -116,6 +127,9 @@ if ($^O eq "linux") {
 	$SYS_signalfd4 = 317;
 	$SYS_renameat2 //= 345;
 	$SFD_CLOEXEC = 020000000;
+	$SYS_fstatfs = 158;
+	$FS_IOC_GETFLAGS = 0x40086601;
+	$FS_IOC_SETFLAGS = 0x80086602;
     } elsif ($machine =~ m/^parisc/) {
         $SYS_epoll_create = 224;
         $SYS_epoll_ctl    = 225;
@@ -129,6 +143,9 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 313;
 	$SYS_renameat2 //= 357;
+	$SYS_fstatfs = 100;
+	$FS_IOC_GETFLAGS = 0x40086601;
+	$FS_IOC_SETFLAGS = 0x80086602;
     } elsif ($machine eq "ppc") {
         $SYS_epoll_create = 236;
         $SYS_epoll_ctl    = 237;
@@ -136,6 +153,9 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 313;
 	$SYS_renameat2 //= 357;
+	$SYS_fstatfs = 100;
+	$FS_IOC_GETFLAGS = 0x40086601;
+	$FS_IOC_SETFLAGS = 0x80086602;
     } elsif ($machine =~ m/^s390/) {
         $SYS_epoll_create = 249;
         $SYS_epoll_ctl    = 250;
@@ -143,6 +163,7 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 322;
 	$SYS_renameat2 //= 347;
+	$SYS_fstatfs = 100;
     } elsif ($machine eq "ia64") {
         $SYS_epoll_create = 1243;
         $SYS_epoll_ctl    = 1244;
@@ -165,6 +186,9 @@ if ($^O eq "linux") {
         $no_deprecated    = 1;
         $SYS_signalfd4 = 74;
 	$SYS_renameat2 //= 276;
+	$SYS_fstatfs = 44;
+	$FS_IOC_GETFLAGS = 0x80086601;
+	$FS_IOC_SETFLAGS = 0x40086602;
     } elsif ($machine =~ m/arm(v\d+)?.*l/) {
         # ARM OABI
         $SYS_epoll_create = 250;
@@ -173,6 +197,7 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 355;
 	$SYS_renameat2 //= 382;
+	$SYS_fstatfs = 100;
     } elsif ($machine =~ m/^mips64/) {
         $SYS_epoll_create = 5207;
         $SYS_epoll_ctl    = 5208;
@@ -180,6 +205,9 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 5283;
 	$SYS_renameat2 //= 5311;
+	$SYS_fstatfs = 5135;
+	$FS_IOC_GETFLAGS = 0x40046601;
+	$FS_IOC_SETFLAGS = 0x80046602;
     } elsif ($machine =~ m/^mips/) {
         $SYS_epoll_create = 4248;
         $SYS_epoll_ctl    = 4249;
@@ -187,6 +215,9 @@ if ($^O eq "linux") {
         $u64_mod_8        = 1;
         $SYS_signalfd4 = 4324;
 	$SYS_renameat2 //= 4351;
+	$SYS_fstatfs = 4100;
+	$FS_IOC_GETFLAGS = 0x40046601;
+	$FS_IOC_SETFLAGS = 0x80046602;
     } else {
         # as a last resort, try using the *.ph files which may not
         # exist or may be wrong
@@ -312,7 +343,7 @@ sub rename_noreplace ($$) {
 		my $ret = syscall($SYS_renameat2, -100, $old, -100, $new, 1);
 		if ($ret == 0) {
 			1; # like rename() perlop
-		} elsif ($! == ENOSYS) {
+		} elsif ($! == ENOSYS || $! == EINVAL) {
 			undef $SYS_renameat2;
 			_rename_noreplace_racy($old, $new);
 		} else {
@@ -323,6 +354,30 @@ sub rename_noreplace ($$) {
 	}
 }
 
+sub nodatacow_fh {
+	return if !defined($SYS_fstatfs);
+	my $buf = '';
+	vec($buf, 120 * 8 - 1, 1) = 0;
+	my ($fh) = @_;
+	syscall($SYS_fstatfs, fileno($fh), $buf) == 0 or
+		return warn("fstatfs: $!\n");
+	my $f_type = unpack('l!', $buf); # statfs.f_type is a signed word
+	return if $f_type != 0x9123683E; # BTRFS_SUPER_MAGIC
+
+	$FS_IOC_GETFLAGS //
+		return warn('FS_IOC_GETFLAGS undefined for platform');
+	ioctl($fh, $FS_IOC_GETFLAGS, $buf) //
+		return warn("FS_IOC_GETFLAGS: $!\n");
+	my $attr = unpack('l!', $buf);
+	return if ($attr & 0x00800000); # FS_NOCOW_FL;
+	ioctl($fh, $FS_IOC_SETFLAGS, pack('l', $attr | 0x00800000)) //
+		warn("FS_IOC_SETFLAGS: $!\n");
+}
+
+sub nodatacow_dir {
+	if (open my $fh, '<', $_[0]) { nodatacow_fh($fh) }
+}
+
 1;
 
 =head1 WARRANTY