ide: Implement disk shock protection support (v4)

On user request (through sysfs), the IDLE IMMEDIATE command with UNLOAD
FEATURE as specified in ATA-7 is issued to the device and processing of
the request queue is stopped thereafter until the specified timeout
expires or user space asks to resume normal operation. This is supposed
to prevent the heads of a hard drive from accidentally crashing onto the
platter when a heavy shock is anticipated (like a falling laptop expected
to hit the floor). Port resets are deferred whenever a device on that
port is in the parked state.

v3:
Elias Oltmanns <eo@nebensachen.de> wrote:
[...]
> >> 1. Make sure that no negative value is being passed to
> >>    jiffies_to_msecs() in ide_park_show().
> >> 2. Drop the superfluous variable hwif in ide_special_rq().
> >> 3. Skip initialisation of task and tf in ide_special_rq() if we are not
> >>    handling a (un)park request.
> >
> > Well, #3 should have been done differently because we donn't want to
> > check for REQ_(UN)?PARK_HEADS more often than is necessary.
> 
> While preparing the backport to 2.6.27, it has just occurred to me that
> we need to clear the IDE_DFLAG_PARKED flag in ide_disk_pre_reset()
> because this flag must not be set after *any* sort of access to the
> device.

v4:
Fix a memory leak due to a missing blk_put_request() in
issue_park_cmd(). Additionally, we should plug the queue when enqueueing
the unpark request because there is no guarantee that the park timeout
has not expired by then. Even though the chance for that to happen is
very slim, the request might end up hanging in the queue until the next
I/O operation is queued up. While at it, clean up the code a little:
- make issue_park_cmd() a function of type void since nobody cares for
  the return value anyway;
- use blk_start_queueing() instead of __blk_run_queue() since we don't
  have to worry about recursion;
- remove a superfluous pointer deference in task_no_data_intr().

Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Cc: Jeff Garzik <jeff@garzik.org>,
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Tejun Heo <htejun@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
new file mode 100644
index 000000000000..03b00e57e93f
--- /dev/null
+++ b/drivers/ide/ide-park.c
@@ -0,0 +1,121 @@
+#include <linux/kernel.h>
+#include <linux/ide.h>
+#include <linux/jiffies.h>
+#include <linux/blkdev.h>
+
+DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
+
+static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
+{
+	struct request_queue *q = drive->queue;
+	struct request *rq;
+	int rc;
+
+	timeout += jiffies;
+	spin_lock_irq(&ide_lock);
+	if (drive->dev_flags & IDE_DFLAG_PARKED) {
+		ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
+		int reset_timer;
+
+		reset_timer = time_before(timeout, drive->sleep);
+		drive->sleep = timeout;
+		wake_up_all(&ide_park_wq);
+		if (reset_timer && hwgroup->sleeping &&
+		    del_timer(&hwgroup->timer)) {
+			hwgroup->sleeping = 0;
+			hwgroup->busy = 0;
+			blk_start_queueing(q);
+		}
+		spin_unlock_irq(&ide_lock);
+		return;
+	}
+	spin_unlock_irq(&ide_lock);
+
+	rq = blk_get_request(q, READ, __GFP_WAIT);
+	rq->cmd[0] = REQ_PARK_HEADS;
+	rq->cmd_len = 1;
+	rq->cmd_type = REQ_TYPE_SPECIAL;
+	rq->special = &timeout;
+	rc = blk_execute_rq(q, NULL, rq, 1);
+	blk_put_request(rq);
+	if (rc)
+		goto out;
+
+	/*
+	 * Make sure that *some* command is sent to the drive after the
+	 * timeout has expired, so power management will be reenabled.
+	 */
+	rq = blk_get_request(q, READ, GFP_NOWAIT);
+	if (unlikely(!rq))
+		goto out;
+
+	rq->cmd[0] = REQ_UNPARK_HEADS;
+	rq->cmd_len = 1;
+	rq->cmd_type = REQ_TYPE_SPECIAL;
+	elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
+
+out:
+	return;
+}
+
+ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
+		      char *buf)
+{
+	ide_drive_t *drive = to_ide_device(dev);
+	unsigned long now;
+	unsigned int msecs;
+
+	if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
+		return -EOPNOTSUPP;
+
+	spin_lock_irq(&ide_lock);
+	now = jiffies;
+	if (drive->dev_flags & IDE_DFLAG_PARKED &&
+	    time_after(drive->sleep, now))
+		msecs = jiffies_to_msecs(drive->sleep - now);
+	else
+		msecs = 0;
+	spin_unlock_irq(&ide_lock);
+
+	return snprintf(buf, 20, "%u\n", msecs);
+}
+
+ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t len)
+{
+#define MAX_PARK_TIMEOUT 30000
+	ide_drive_t *drive = to_ide_device(dev);
+	long int input;
+	int rc;
+
+	rc = strict_strtol(buf, 10, &input);
+	if (rc || input < -2)
+		return -EINVAL;
+	if (input > MAX_PARK_TIMEOUT) {
+		input = MAX_PARK_TIMEOUT;
+		rc = -EOVERFLOW;
+	}
+
+	mutex_lock(&ide_setting_mtx);
+	if (input >= 0) {
+		if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
+			rc = -EOPNOTSUPP;
+		else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
+			issue_park_cmd(drive, msecs_to_jiffies(input));
+	} else {
+		if (drive->media == ide_disk)
+			switch (input) {
+			case -1:
+				drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
+				break;
+			case -2:
+				drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
+				break;
+			}
+		else
+			rc = -EOPNOTSUPP;
+	}
+	mutex_unlock(&ide_setting_mtx);
+
+	return rc ? rc : len;
+}