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Index: sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
===================================================================
--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
+++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
@@ -1393,6 +1393,7 @@
vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED;
vfsp->mnt_kern_flag |= MNTK_NO_IOPF; /* vn_io_fault can be used */
+ vfsp->mnt_kern_flag |= MNTK_NOMSYNC;
/*
* The fsid is 64 bits, composed of an 8-bit fs type, which
Index: sys/fs/devfs/devfs_vfsops.c
===================================================================
--- sys/fs/devfs/devfs_vfsops.c
+++ sys/fs/devfs/devfs_vfsops.c
@@ -130,7 +130,8 @@
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
- mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
+ mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
+ MNTK_NOMSYNC;
#ifdef MAC
mp->mnt_flag |= MNT_MULTILABEL;
#endif
Index: sys/fs/nullfs/null_vfsops.c
===================================================================
--- sys/fs/nullfs/null_vfsops.c
+++ sys/fs/nullfs/null_vfsops.c
@@ -205,7 +205,7 @@
(MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED |
MNTK_EXTENDED_SHARED);
}
- mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT;
+ mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT | MNTK_NOMSYNC;
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
(MNTK_USES_BCACHE | MNTK_NO_IOPF | MNTK_UNMAPPED_BUFS);
MNT_IUNLOCK(mp);
Index: sys/fs/pseudofs/pseudofs.c
===================================================================
--- sys/fs/pseudofs/pseudofs.c
+++ sys/fs/pseudofs/pseudofs.c
@@ -368,6 +368,7 @@
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
+ mp->mnt_kern_flag |= MNTK_NOMSYNC;
MNT_IUNLOCK(mp);
mp->mnt_data = pi;
vfs_getnewfsid(mp);
Index: sys/fs/tmpfs/tmpfs_vfsops.c
===================================================================
--- sys/fs/tmpfs/tmpfs_vfsops.c
+++ sys/fs/tmpfs/tmpfs_vfsops.c
@@ -507,7 +507,7 @@
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
- MNTK_TEXT_REFS;
+ MNTK_TEXT_REFS | MNTK_NOMSYNC;
MNT_IUNLOCK(mp);
mp->mnt_data = tmp;
Index: sys/kern/vfs_subr.c
===================================================================
--- sys/kern/vfs_subr.c
+++ sys/kern/vfs_subr.c
@@ -4395,6 +4395,9 @@
CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
+ if ((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0)
+ return;
+
MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) {
obj = vp->v_object;
if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0 &&
Index: sys/sys/mount.h
===================================================================
--- sys/sys/mount.h
+++ sys/sys/mount.h
@@ -396,6 +396,7 @@
#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
#define MNTK_ASYNC 0x00000002 /* filtered async flag */
#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
+#define MNTK_NOMSYNC 0x00000008 /* don't do vfs_msync */
#define MNTK_DRAINING 0x00000010 /* lock draining is happening */
#define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
#define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */

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