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Index: sys/fs/devfs/devfs_devs.c
===================================================================
--- sys/fs/devfs/devfs_devs.c
+++ sys/fs/devfs/devfs_devs.c
@@ -61,7 +61,7 @@
static MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3");
static MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage");
-static SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem");
+SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem");
static unsigned devfs_generation;
SYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD,
Index: sys/fs/devfs/devfs_vnops.c
===================================================================
--- sys/fs/devfs/devfs_vnops.c
+++ sys/fs/devfs/devfs_vnops.c
@@ -57,6 +57,7 @@
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/sx.h>
+#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/unistd.h>
@@ -79,6 +80,12 @@
struct mtx cdevpriv_mtx;
MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
+SYSCTL_DECL(_vfs_devfs);
+
+static int devfs_dotimes;
+SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
+ &devfs_dotimes, 0, "Update timestamps on DEVFS");
+
static int
devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
int *ref)
@@ -1221,7 +1228,8 @@
foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
error = dsw->d_read(dev, uio, ioflag);
- if (uio->uio_resid != resid || (error == 0 && resid != 0))
+ if (devfs_dotimes &&
+ (uio->uio_resid != resid || (error == 0 && resid != 0)))
vfs_timestamp(&dev->si_atime);
td->td_fpop = fpop;
dev_relthread(dev, ref);
@@ -1581,7 +1589,7 @@
c = 1;
}
- if (c) {
+ if (devfs_dotimes && c) {
if (vp->v_type == VCHR)
vfs_timestamp(&vp->v_rdev->si_ctime);
else
@@ -1700,7 +1708,8 @@
resid = uio->uio_resid;
error = dsw->d_write(dev, uio, ioflag);
- if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
+ if (devfs_dotimes &&
+ (uio->uio_resid != resid || (error == 0 && resid != 0))) {
vfs_timestamp(&dev->si_ctime);
dev->si_mtime = dev->si_ctime;
}

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