linux-kernel - [patch 2/3] libata: expose AN support to user space via sysfs

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Date:	Wed, 28 Mar 2007 16:44:50 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, linux-ide@...r.kernel.org,
	jgarzik@...ox.com,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: [patch 2/3] libata: expose AN support to user space via sysfs

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@...el.com>

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,

-- 
-
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