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-git/block/genhd.c
===================================================================
--- 2.6-git.orig/block/genhd.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/block/genhd.c 2007-03-21 01:23:46.000000000 -0700
@@ -369,6 +369,11 @@
{
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)
{
@@ -416,6 +421,10 @@
.attr = {.name = "stat", .mode = S_IRUGO },
.show = disk_stats_read
};
+static struct disk_attribute disk_attr_an = {
+ .attr = {.name = "async_notification", .mode = S_IRUGO },
+ .show = disk_an_read
+};
#ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -452,6 +461,7 @@
&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-git/include/linux/genhd.h
===================================================================
--- 2.6-git.orig/include/linux/genhd.h 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/include/linux/genhd.h 2007-03-21 01:23:46.000000000 -0700
@@ -90,6 +90,7 @@
#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-git/include/scsi/scsi_device.h
===================================================================
--- 2.6-git.orig/include/scsi/scsi_device.h 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/include/scsi/scsi_device.h 2007-03-21 01:23:46.000000000 -0700
@@ -123,7 +123,7 @@
unsigned select_no_atn:1;
unsigned fix_capacity:1; /* READ_CAPACITY is 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-git/drivers/ata/libata-scsi.c
===================================================================
--- 2.6-git.orig/drivers/ata/libata-scsi.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/drivers/ata/libata-scsi.c 2007-03-21 01:23:46.000000000 -0700
@@ -855,6 +855,9 @@
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-git/drivers/scsi/sr.c
===================================================================
--- 2.6-git.orig/drivers/scsi/sr.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/drivers/scsi/sr.c 2007-03-21 01:23:46.000000000 -0700
@@ -602,6 +602,8 @@
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,
--
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-git/block/genhd.c
===================================================================
--- 2.6-git.orig/block/genhd.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/block/genhd.c 2007-03-21 01:23:46.000000000 -0700
@@ -369,6 +369,11 @@
{
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)
{
@@ -416,6 +421,10 @@
.attr = {.name = "stat", .mode = S_IRUGO },
.show = disk_stats_read
};
+static struct disk_attribute disk_attr_an = {
+ .attr = {.name = "async_notification", .mode = S_IRUGO },
+ .show = disk_an_read
+};
#ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -452,6 +461,7 @@
&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-git/include/linux/genhd.h
===================================================================
--- 2.6-git.orig/include/linux/genhd.h 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/include/linux/genhd.h 2007-03-21 01:23:46.000000000 -0700
@@ -90,6 +90,7 @@
#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-git/include/scsi/scsi_device.h
===================================================================
--- 2.6-git.orig/include/scsi/scsi_device.h 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/include/scsi/scsi_device.h 2007-03-21 01:23:46.000000000 -0700
@@ -123,7 +123,7 @@
unsigned select_no_atn:1;
unsigned fix_capacity:1; /* READ_CAPACITY is 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-git/drivers/ata/libata-scsi.c
===================================================================
--- 2.6-git.orig/drivers/ata/libata-scsi.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/drivers/ata/libata-scsi.c 2007-03-21 01:23:46.000000000 -0700
@@ -855,6 +855,9 @@
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-git/drivers/scsi/sr.c
===================================================================
--- 2.6-git.orig/drivers/scsi/sr.c 2007-03-21 01:22:04.000000000 -0700
+++ 2.6-git/drivers/scsi/sr.c 2007-03-21 01:23:46.000000000 -0700
@@ -602,6 +602,8 @@
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,
--
