Add a "spindown" facility to ata-disks: If no requests have been received

for a configurable number of seconds, spin the disk down.  Spin it back
up on the next request.

Notice that the timeout is only armed by a request, so to spin down a
disk you may have to do:

	atacontrol spindown ad10 5
	dd if=/dev/ad10 of=/dev/null count=1

To disable spindown, set timeout to zero:

	atacontrol spindown ad10 0

In order to debug any trouble caused, this code is somewhat noisy on the
console.

Enabling spindown on a disk containing / or /var/log/messages is not
going to do anything sensible.

Spinning a disk up and down all the time will wear it out, use sensibly.

Approved by:	sos

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/dev/ata/ata-disk.h b/sys/dev/ata/ata-disk.h
index 1ebd3e0..562b32f 100644
--- a/sys/dev/ata/ata-disk.h
+++ b/sys/dev/ata/ata-disk.h
@@ -34,7 +34,7 @@ struct ad_softc {
     u_int32_t                   transfersize;   /* size of each transfer */
     int                         num_tags;       /* number of tags supported */
     int                         flags;          /* drive flags */
-#define         AD_F_LABELLING          0x0001          
+#define         AD_F_LABELLING          0x0001
 #define         AD_F_CHS_USED           0x0002
 #define         AD_F_32B_ENABLED        0x0004
 #define         AD_F_TAG_ENABLED        0x0008