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 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,