From: Francois Tigeot <ftigeot@wolfpond.org>
Date: Wed, 28 Mar 2012 11:52:36 +0000 (+0200)
Subject: VFS accounting: small speed optimization
X-Git-Tag: v3.4.0rc~1149^2~5
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/d4eea8cb1addde189e3a7e54d0962eecfeea7153?ds=sidebyside

VFS accounting: small speed optimization

* Some operations may end up using the accounting macro with an
  effective zero bytes space usage difference

* Avoid calling the whole mess and its associated mount-point spinlock
  in that case.
---

diff --git a/sys/sys/mount.h b/sys/sys/mount.h
index dadd883737..e3c3b1cbfb 100644
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -622,7 +622,7 @@ struct vfsops {
 #define VFS_EXTATTRCTL(MP, C, FVP, NS, N, CRED)	\
 	vfs_extattrctl(MP, C, FVP, NS, N, CRED)
 #define VFS_ACCOUNT(MP, U, G, D) \
-	if (MP->mnt_op->vfs_account != NULL) \
+	if ((MP->mnt_op->vfs_account != NULL) && (D != 0)) \
 		MP->mnt_op->vfs_account(MP, U, G, D);
 #define VFS_NCPGEN_SET(MP, NCP) \
 	MP->mnt_op->vfs_ncpgen_set(MP, NCP)