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From: Alexander Motin <mav@FreeBSD.org>
Date: Wed, 11 Jun 2014 12:56:49 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r267362 - head/sys/kern
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Author: mav
Date: Wed Jun 11 12:56:49 2014
New Revision: 267362
URL: http://svnweb.freebsd.org/changeset/base/267362

Log:
  Remove unneeded mountlist_mtx acquisition from sync_fsync().
  
  All struct mount fields accessed by sync_fsync() are protected by MNT_MTX.

Modified:
  head/sys/kern/vfs_subr.c

Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c	Wed Jun 11 11:27:44 2014	(r267361)
+++ head/sys/kern/vfs_subr.c	Wed Jun 11 12:56:49 2014	(r267362)
@@ -3656,11 +3656,8 @@ sync_fsync(struct vop_fsync_args *ap)
 	 * Walk the list of vnodes pushing all that are dirty and
 	 * not already on the sync list.
 	 */
-	mtx_lock(&mountlist_mtx);
-	if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) {
-		mtx_unlock(&mountlist_mtx);
+	if (vfs_busy(mp, MBF_NOWAIT) != 0)
 		return (0);
-	}
 	if (vn_start_write(NULL, &mp, V_NOWAIT) != 0) {
 		vfs_unbusy(mp);
 		return (0);