cmd/link: accept extra blocks in TestFallocate

For #41127

Change-Id: I794a082299c6dce4202223197ece1864bed36810
Reviewed-on: https://go-review.googlesource.com/c/go/+/282555
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

diff --git a/src/cmd/link/internal/ld/fallocate_test.go b/src/cmd/link/internal/ld/fallocate_test.go
index 51f5fcdd9fc27d6f4e138c40700d9c4474747ab8..244b70f0615067d724febf3fbb8ed91e2edb250a 100644 (file)
--- a/src/cmd/link/internal/ld/fallocate_test.go
+++ b/src/cmd/link/internal/ld/fallocate_test.go
@@ -57,8 +57,12 @@ func TestFallocate(t *testing.T) {
                if got := stat.Size(); got != sz {
                        t.Errorf("unexpected file size: got %d, want %d", got, sz)
                }
-               if got, want := stat.Sys().(*syscall.Stat_t).Blocks, (sz+511)/512; got != want {
-                       t.Errorf("unexpected disk usage: got %d blocks, want %d", got, want)
+               // The number of blocks must be enough for the requested size.
+               // We used to require an exact match, but it appears that
+               // some file systems allocate a few extra blocks in some cases.
+               // See issue #41127.
+               if got, want := stat.Sys().(*syscall.Stat_t).Blocks, (sz+511)/512; got < want {
+                       t.Errorf("unexpected disk usage: got %d blocks, want at least %d", got, want)
                }
                out.munmap()
        }