Fix panic when removing open device (found by bp@)

 Implement subdirs.
 Build the full "devicename" for cloning functions.
 Fix panic when deleted device goes away.
 Collaps devfs_dir and devfs_dirent structures.
 Add proper cloning to the /dev/fd* "device-"driver.
 Fix a bug in make_dev_alias() handling which made aliases appear
  multiple times.
 Use devfs_clone to implement getdiskbyname()
 Make specfs maintain the stat(2) timestamps per dev_t

1 files changed, 11 insertions, 3 deletions

diff --git a/sys/fs/specfs/spec_vnops.c b/sys/fs/specfs/spec_vnops.c
index f6bd853..f681cc8 100644
--- a/sys/fs/specfs/spec_vnops.c
+++ b/sys/fs/specfs/spec_vnops.c
@@ -246,19 +246,22 @@ spec_read(ap)
 	struct proc *p;
 	struct uio *uio;
 	dev_t dev;
-	int error;
+	int error, resid;
 
 	vp = ap->a_vp;
 	dev = vp->v_rdev;
 	uio = ap->a_uio;
 	p = uio->uio_procp;
+	resid = uio->uio_resid;
 
-	if (uio->uio_resid == 0)
+	if (resid == 0)
 		return (0);
 
 	VOP_UNLOCK(vp, 0, p);
 	error = (*devsw(dev)->d_read) (dev, uio, ap->a_ioflag);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (uio->uio_resid != resid || (error == 0 && resid != 0))
+		getnanotime(&dev->si_atime);
 	return (error);
 }
 
@@ -279,16 +282,21 @@ spec_write(ap)
 	struct proc *p;
 	struct uio *uio;
 	dev_t dev;
-	int error;
+	int error, resid;
 
 	vp = ap->a_vp;
 	dev = vp->v_rdev;
 	uio = ap->a_uio;
 	p = uio->uio_procp;
+	resid = uio->uio_resid;
 
 	VOP_UNLOCK(vp, 0, p);
 	error = (*devsw(dev)->d_write) (dev, uio, ap->a_ioflag);
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
+		getnanotime(&dev->si_ctime);
+		dev->si_mtime = dev->si_ctime;
+	}
 	return (error);
 }