r22105: Added vfs_readahead module that appears to do wonderful things

for copying files from Samba when using Windows Vista Windows
explorer.... :-). By default if you add this I can go on my
vmware sessions from 7MB/sec to 12MB/sec (+1 extra MB/sec if
I turn sendfile on).
Jeremy.
(This used to be commit 97fdd67e83bb2706106a9bae95b32d8d9f8b4066)

1 files changed, 22 insertions, 1 deletions

diff --git a/source3/configure.in b/source3/configure.in
index eb4bd9bcdc..326f81ca00 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -594,7 +594,7 @@ dnl These have to be built static:
 default_static_modules="pdb_smbpasswd pdb_tdbsam rpc_lsa rpc_samr rpc_winreg rpc_initshutdown rpc_lsa_ds rpc_wkssvc rpc_svcctl rpc_ntsvcs rpc_net rpc_netdfs rpc_srvsvc rpc_spoolss rpc_eventlog rpc_unixinfo rpc_epmapper auth_sam auth_unix auth_winbind auth_server auth_domain auth_builtin vfs_default nss_info_template"
 
 dnl These are preferably build shared, and static if dlopen() is not available
-default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_full_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly vfs_cap vfs_expand_msdfs vfs_shadow_copy charset_CP850 charset_CP437 auth_script"
+default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_full_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly vfs_cap vfs_expand_msdfs vfs_shadow_copy charset_CP850 charset_CP437 auth_script vfs_readahead"
 
 if test "x$developer" = xyes; then
    default_static_modules="$default_static_modules rpc_rpcecho"
@@ -5667,6 +5667,26 @@ if test x"$samba_cv_HAVE_LINUX_READAHEAD" = x"yes"; then
              [Whether Linux readahead is available])
 fi
 
+############################################
+# See if we have the posix_fadvise syscall.
+
+AC_CACHE_CHECK([for posix_fadvise],
+                samba_cv_HAVE_POSIX_FADVISE,[
+    AC_TRY_LINK([
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+#include <fcntl.h>],
+    [ssize_t err = posix_fadvise(0,0,0x80000,POSIX_FADV_WILLNEED);],
+    samba_cv_HAVE_POSIX_FADVISE=yes,
+    samba_cv_HAVE_POSIX_FADVISE=no)])
+
+if test x"$samba_cv_HAVE_POSIX_FADVISE" = x"yes"; then
+  AC_DEFINE(HAVE_POSIX_FADVISE,1,
+             [Whether posix_fadvise is available])
+fi
+
+
 
 #################################################
 # Check whether winbind is supported on this platform.  If so we need to
@@ -6061,6 +6081,7 @@ SMB_MODULE(vfs_prealloc, \$(VFS_PREALLOC_OBJ), "bin/prealloc.$SHLIBEXT", VFS)
 SMB_MODULE(vfs_commit, \$(VFS_COMMIT_OBJ), "bin/commit.$SHLIBEXT", VFS)
 SMB_MODULE(vfs_gpfs, \$(VFS_GPFS_OBJ), "bin/gpfs.$SHLIBEXT", VFS)
 SMB_MODULE(vfs_notify_fam, \$(VFS_NOTIFY_FAM_OBJ), "bin/notify_fam.$SHLIBEXT", VFS)
+SMB_MODULE(vfs_readahead, \$(VFS_LINUX_READAHEAD_OBJ), "bin/readahead.$SHLIBEXT", VFS)
 
 SMB_SUBSYSTEM(VFS,smbd/vfs.o)