Messages in this thread Patch in this message | | | Date | Tue, 13 Jul 2004 23:07:21 +0200 | From | Olaf Hering <> | Subject | [PATCH] add removeable sysfs block device attribute |
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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. ;)
diff -purN linux-2.6.8-rc1-bk2/drivers/block/genhd.c linux-2.6.8-rc1-bk2.removeable_media/drivers/block/genhd.c --- linux-2.6.8-rc1-bk2/drivers/block/genhd.c 2004-07-13 20:14:17.326681737 +0000 +++ linux-2.6.8-rc1-bk2.removeable_media/drivers/block/genhd.c 2004-07-13 20:47:52.215560764 +0000 @@ -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, -- USB is for mice, FireWire is for men!
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