[PATCH] Speed up test suite by avoiding fsync

[Colin Watson]

Add grub_util_disable_fd_syncs call to turn grub_util_fd_sync calls into
no-ops, and use it in programs that copy files but do not need to take
special care to sync writes (grub-mknetdir, grub-rescue,
grub-mkstandalone).

On my laptop, this reduces partmap_test's runtime from 1236 seconds to
204 seconds.
---
 ChangeLog                          |  7 +++++++
 grub-core/osdep/aros/hostdisk.c    | 25 ++++++++++++++++++-------
 grub-core/osdep/unix/hostdisk.c    | 11 ++++++++++-
 grub-core/osdep/windows/hostdisk.c | 11 ++++++++++-
 include/grub/emu/hostfile.h        |  2 ++
 util/grub-install-common.c         |  2 +-
 util/grub-mknetdir.c               |  1 +
 util/grub-mkrescue.c               |  3 ++-
 util/grub-mkstandalone.c           |  1 +
 9 files changed, 52 insertions(+), 11 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 2e0d96e..4bbec86 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-11-27  Colin Watson  <address@hidden>
+
+       Add grub_util_disable_fd_syncs call to turn grub_util_fd_sync calls
+       into no-ops, and use it in programs that copy files but do not need
+       to take special care to sync writes (grub-mknetdir, grub-rescue,
+       grub-mkstandalone).
+
 2013-11-26  Colin Watson  <address@hidden>
 
        * tests/util/grub-fs-tester.in: Execute xorriso from $PATH rather
diff --git a/grub-core/osdep/aros/hostdisk.c b/grub-core/osdep/aros/hostdisk.c
index 9c0a6c8..b153907 100644
--- a/grub-core/osdep/aros/hostdisk.c
+++ b/grub-core/osdep/aros/hostdisk.c
@@ -455,6 +455,8 @@ grub_util_fd_close (grub_util_fd_t fd)
     }
 }
 
+static int allow_fd_syncs = 1;
+
 static void
 grub_util_fd_sync_volume (grub_util_fd_t fd)
 {
@@ -469,18 +471,27 @@ grub_util_fd_sync_volume (grub_util_fd_t fd)
 void
 grub_util_fd_sync (grub_util_fd_t fd)
 {
-  switch (fd->type)
+  if (allow_fd_syncs)
     {
-    case GRUB_UTIL_FD_FILE:
-      fsync (fd->fd);
-      return;
-    case GRUB_UTIL_FD_DISK:
-      grub_util_fd_sync_volume (fd);
-      return;
+      switch (fd->type)
+       {
+       case GRUB_UTIL_FD_FILE:
+         fsync (fd->fd);
+         return;
+       case GRUB_UTIL_FD_DISK:
+         grub_util_fd_sync_volume (fd);
+         return;
+       }
     }
 }
 
 void
+grub_util_disable_fd_syncs (void)
+{
+  allow_fd_syncs = 0;
+}
+
+void
 grub_hostdisk_flush_initial_buffer (const char *os_dev __attribute__ 
((unused)))
 {
 }
diff --git a/grub-core/osdep/unix/hostdisk.c b/grub-core/osdep/unix/hostdisk.c
index 78d4adb..fc88ed4 100644
--- a/grub-core/osdep/unix/hostdisk.c
+++ b/grub-core/osdep/unix/hostdisk.c
@@ -191,10 +191,19 @@ grub_util_fd_strerror (void)
   return strerror (errno);
 }
 
+static int allow_fd_syncs = 1;
+
 void
 grub_util_fd_sync (grub_util_fd_t fd)
 {
-  fsync (fd);
+  if (allow_fd_syncs)
+    fsync (fd);
+}
+
+void
+grub_util_disable_fd_syncs (void)
+{
+  allow_fd_syncs = 0;
 }
 
 void
diff --git a/grub-core/osdep/windows/hostdisk.c 
b/grub-core/osdep/windows/hostdisk.c
index 6d7d120..4748a61 100644
--- a/grub-core/osdep/windows/hostdisk.c
+++ b/grub-core/osdep/windows/hostdisk.c
@@ -240,10 +240,19 @@ grub_util_fd_write (grub_util_fd_t fd, const char *buf, 
size_t len)
   return real_read;
 }
 
+static int allow_fd_syncs = 1;
+
 void
 grub_util_fd_sync (grub_util_fd_t fd)
 {
-  FlushFileBuffers (fd);
+  if (allow_fd_syncs)
+    FlushFileBuffers (fd);
+}
+
+void
+grub_util_disable_fd_syncs (void)
+{
+  allow_fd_syncs = 0;
 }
 
 void
diff --git a/include/grub/emu/hostfile.h b/include/grub/emu/hostfile.h
index ab01fbc..8e37d5a 100644
--- a/include/grub/emu/hostfile.h
+++ b/include/grub/emu/hostfile.h
@@ -50,6 +50,8 @@ EXPORT_FUNC(grub_util_fd_strerror) (void);
 void
 grub_util_fd_sync (grub_util_fd_t fd);
 void
+grub_util_disable_fd_syncs (void);
+void
 EXPORT_FUNC(grub_util_fd_close) (grub_util_fd_t fd);
 
 grub_uint64_t
diff --git a/util/grub-install-common.c b/util/grub-install-common.c
index 7ecef3e..fcf994d 100644
--- a/util/grub-install-common.c
+++ b/util/grub-install-common.c
@@ -492,7 +492,7 @@ grub_install_make_image_wrap (const char *dir, const char 
*prefix,
                                     memdisk_path, config_path,
                                     mkimage_target, note, comp);
   fflush (fp);
-  fsync (fileno (fp));
+  grub_util_fd_sync (fileno (fp));
   fclose (fp);
 }
 
diff --git a/util/grub-mknetdir.c b/util/grub-mknetdir.c
index 3f91705..40ca724 100644
--- a/util/grub-mknetdir.c
+++ b/util/grub-mknetdir.c
@@ -171,6 +171,7 @@ main (int argc, char *argv[])
   const char *pkglibdir;
 
   grub_util_host_init (&argc, &argv);
+  grub_util_disable_fd_syncs ();
   rootdir = xstrdup ("/srv/tftp");
   pkglibdir = grub_util_get_pkglibdir ();
 
diff --git a/util/grub-mkrescue.c b/util/grub-mkrescue.c
index 7a76bc3..b081b3b 100644
--- a/util/grub-mkrescue.c
+++ b/util/grub-mkrescue.c
@@ -369,6 +369,7 @@ main (int argc, char *argv[])
   const char *pkgdatadir;
 
   grub_util_host_init (&argc, &argv);
+  grub_util_disable_fd_syncs ();
 
   pkgdatadir = grub_util_get_pkgdatadir ();
 
@@ -529,7 +530,7 @@ main (int argc, char *argv[])
                                            GRUB_COMPRESSION_AUTO);
              sz = ftello (sa);
              fflush (sa);
-             fsync (fileno (sa));
+             grub_util_fd_sync (fileno (sa));
              fclose (sa);
              
              if (sz > 32768)
diff --git a/util/grub-mkstandalone.c b/util/grub-mkstandalone.c
index 774af2f..3097f70 100644
--- a/util/grub-mkstandalone.c
+++ b/util/grub-mkstandalone.c
@@ -305,6 +305,7 @@ main (int argc, char *argv[])
   int i;
 
   grub_util_host_init (&argc, &argv);
+  grub_util_disable_fd_syncs ();
 
   files = xmalloc ((argc + 1) * sizeof (files[0]));
 
-- 
1.8.4.3