add removeable sysfs block device attribute

PATCH New Olaf Hering 1 participant 1 message Jul 13, 2004 Block layer

Share & tools

Olaf Hering

author

2004-07-13 21:10 UTC #0 lore raw

PATCH 1/1 add removeable sysfs block device attribute

This patch adds a /block/*/removeable sysfs attribute. A value of 1 indicates the media can change anytime. This is a hint for userland to poll such devices for possible media changes, and leave all others alone. There is currently no way to see if a connected usb-storage device is a disk or a card reader. It will also show 1 for CD and ZIP drives.

It was done by Patrick Mansfield a while ago. I can probably not sigh-off his work. ;)

drivers/block/genhd.c +11 -0

diff -purN linux-2.6.8-rc1-bk2/drivers/block/genhd.c linux-2.6.8-rc1-bk2.removeable_media/drivers/block/genhd.c
@@ -352,6 +352,12 @@ static ssize_t disk_range_read(struct ge
 {
 	return sprintf(page, "%d\n", disk->minors);
 }
+static ssize_t disk_removable_read(struct gendisk * disk, char *page)
+{
+	return sprintf(page, "%d\n",
+		       (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
+
+}
 static ssize_t disk_size_read(struct gendisk * disk, char *page)
 {
 	return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk));

@@ -384,6 +390,10 @@ static struct disk_attribute disk_attr_r
 	.attr = {.name = "range", .mode = S_IRUGO },
 	.show	= disk_range_read
 };
+static struct disk_attribute disk_attr_removable = {
+	.attr = {.name = "removable", .mode = S_IRUGO },
+	.show	= disk_removable_read
+};
 static struct disk_attribute disk_attr_size = {
 	.attr = {.name = "size", .mode = S_IRUGO },
 	.show	= disk_size_read

@@ -396,6 +406,7 @@ static struct disk_attribute disk_attr_s
 static struct attribute * default_attrs[] = {
 	&disk_attr_dev.attr,
 	&disk_attr_range.attr,
+	&disk_attr_removable.attr,
 	&disk_attr_size.attr,
 	&disk_attr_stat.attr,
 	NULL,

Signature · 3 lines

USB is for mice, FireWire is for men!

sUse lINUX ag, nÜRNBERG