Allow user space to determine if an ATAPI device supports
async notification (AN) of media changes. This is done by
adding a new sysfs file "async_notification" to genhd.
If the file reads 1, then the device supports async
notification. If the file reads 0, it does not.
A flag is set in the generic disk to indicate whether
or not AN is supported. This flag is set by the SCSI
subsystem when it registers with add_disk. The SCSI
system gets information from libata on whether the
device supports AN during dev_configure.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>
Index: 2.6-mm/block/genhd.c
===================================================================
--- 2.6-mm.orig/block/genhd.c
+++ 2.6-mm/block/genhd.c
@@ -372,6 +372,11 @@ static ssize_t disk_size_read(struct gen
{
return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk));
}
+static ssize_t disk_AN_read(struct gendisk * disk, char *page)
+{
+ return sprintf(page, "%d\n",
+ (disk->flags & GENHD_FL_ASYNC_NOTIFICATION ? 1 : 0));
+}
static ssize_t disk_stats_read(struct gendisk * disk, char *page)
{
@@ -419,6 +424,10 @@ static struct disk_attribute disk_attr_s
.attr = {.name = "stat", .mode = S_IRUGO },
.show = disk_stats_read
};
+static struct disk_attribute disk_attr_AN = {
+ .attr = {.name = "media_change_events", .mode = S_IRUGO },
+ .show = disk_AN_read
+};
#ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -455,6 +464,7 @@ static struct attribute * default_attrs[
&disk_attr_removable.attr,
&disk_attr_size.attr,
&disk_attr_stat.attr,
+ &disk_attr_AN.attr,
#ifdef CONFIG_FAIL_MAKE_REQUEST
&disk_attr_fail.attr,
#endif
Index: 2.6-mm/include/linux/genhd.h
===================================================================
--- 2.6-mm.orig/include/linux/genhd.h
+++ 2.6-mm/include/linux/genhd.h
@@ -94,6 +94,7 @@ struct hd_struct {
#define GENHD_FL_REMOVABLE 1
#define GENHD_FL_DRIVERFS 2
+#define GENHD_FL_ASYNC_NOTIFICATION 4
#define GENHD_FL_CD 8
#define GENHD_FL_UP 16
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
Index: 2.6-mm/include/scsi/scsi_device.h
===================================================================
--- 2.6-mm.orig/include/scsi/scsi_device.h
+++ 2.6-mm/include/scsi/scsi_device.h
@@ -126,7 +126,7 @@ struct scsi_device {
unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
-
+ unsigned async_notification:1; /* device supports async notification */
unsigned int device_blocked; /* Device returned QUEUE_FULL. */
unsigned int max_device_blocked; /* what device_blocked counts down from */
Index: 2.6-mm/drivers/ata/libata-scsi.c
===================================================================
--- 2.6-mm.orig/drivers/ata/libata-scsi.c
+++ 2.6-mm/drivers/ata/libata-scsi.c
@@ -899,6 +899,9 @@ static void ata_scsi_dev_config(struct s
blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
}
+ if (dev->flags & ATA_DFLAG_AN)
+ sdev->async_notification = 1;
+
if (dev->flags & ATA_DFLAG_NCQ) {
int depth;
Index: 2.6-mm/drivers/scsi/sr.c
===================================================================
--- 2.6-mm.orig/drivers/scsi/sr.c
+++ 2.6-mm/drivers/scsi/sr.c
@@ -603,6 +603,8 @@ static int sr_probe(struct device *dev)
dev_set_drvdata(dev, cd);
disk->flags |= GENHD_FL_REMOVABLE;
+ if (sdev->async_notification)
+ disk->flags |= GENHD_FL_ASYNC_NOTIFICATION;
add_disk(disk);
sdev_printk(KERN_DEBUG, sdev,
--
-
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
