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-rw-r--r--lib/PublicInbox/Syscall.pm8
1 files changed, 3 insertions, 5 deletions
diff --git a/lib/PublicInbox/Syscall.pm b/lib/PublicInbox/Syscall.pm
index cc282f9f..22b779ad 100644
--- a/lib/PublicInbox/Syscall.pm
+++ b/lib/PublicInbox/Syscall.pm
@@ -390,12 +390,10 @@ sub rename_noreplace ($$) {
         }
 }
 
-sub nodatacow_fh {
-        return if !defined($SYS_fstatfs);
-        my $buf = '';
-        vec($buf, 120 * 8 - 1, 1) = 0;
+sub nodatacow_fh ($) {
         my ($fh) = @_;
-        syscall($SYS_fstatfs, fileno($fh), $buf) == 0 or
+        my $buf = "\0" x 120;
+        syscall($SYS_fstatfs // return, 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