Author: will
Date: Wed Jan 21 19:25:57 2015
New Revision: 277503
URL: https://svnweb.freebsd.org/changeset/base/277503
Log:
Ignore sync requests from the system syncher, i.e. VFS_SYNC(waitfor=MNT_LAZY).
ZFS already commits outstanding data every zfs_txg_timeout seconds, so these
syncs are unnecessarily intrusive.
Submitted by: gibbs
Sponsored by: Spectra Logic
MFSpectraBSD: 1105759 on 2014/12/11
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Wed Jan
21 19:23:46 2015 (r277502)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Wed Jan
21 19:25:57 2015 (r277503)
@@ -132,6 +132,13 @@ zfs_sync(vfs_t *vfsp, int waitfor)
if (panicstr)
return (0);
+ /*
+ * Ignore the system syncher. ZFS already commits async data
+ * at zfs_txg_timeout intervals.
+ */
+ if (waitfor == MNT_LAZY)
+ return (0);
+
if (vfsp != NULL) {
/*
* Sync a specific filesystem.
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