ChangeSet 1.1784.12.8, 2004/07/14 16:20:29-07:00, olh@suse.de

[PATCH] 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. ;)


Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


 drivers/block/genhd.c |   11 +++++++++++
 1 files changed, 11 insertions(+)


diff -Nru a/drivers/block/genhd.c b/drivers/block/genhd.c
--- a/drivers/block/genhd.c	2004-07-14 17:10:38 -07:00
+++ b/drivers/block/genhd.c	2004-07-14 17:10:38 -07:00
@@ -352,6 +352,12 @@
 {
 	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 @@
 	.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 attribute * default_attrs[] = {
 	&disk_attr_dev.attr,
 	&disk_attr_range.attr,
+	&disk_attr_removable.attr,
 	&disk_attr_size.attr,
 	&disk_attr_stat.attr,
 	NULL,