1 files changed, 19 insertions, 3 deletions

diff --git a/block/genhd.c b/block/genhd.c
index f4c64c2b303a..5b76bf55d05c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -869,6 +869,7 @@ static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
 static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL);
 static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
+static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 static struct device_attribute dev_attr_fail =
         __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
@@ -888,6 +889,7 @@ static struct attribute *disk_attrs[] = {
         &dev_attr_alignment_offset.attr,
         &dev_attr_capability.attr,
         &dev_attr_stat.attr,
+        &dev_attr_inflight.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
         &dev_attr_fail.attr,
 #endif
@@ -1053,7 +1055,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
                            part_stat_read(hd, merges[1]),
                            (unsigned long long)part_stat_read(hd, sectors[1]),
                            jiffies_to_msecs(part_stat_read(hd, ticks[1])),
-                           hd->in_flight,
+                           part_in_flight(hd),
                            jiffies_to_msecs(part_stat_read(hd, io_ticks)),
                            jiffies_to_msecs(part_stat_read(hd, time_in_queue))
                         );
@@ -1215,6 +1217,16 @@ void put_disk(struct gendisk *disk)
 
 EXPORT_SYMBOL(put_disk);
 
+static void set_disk_ro_uevent(struct gendisk *gd, int ro)
+{
+        char event[] = "DISK_RO=1";
+        char *envp[] = { event, NULL };
+
+        if (!ro)
+                event[8] = '0';
+        kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp);
+}
+
 void set_device_ro(struct block_device *bdev, int flag)
 {
         bdev->bd_part->policy = flag;
@@ -1227,8 +1239,12 @@ void set_disk_ro(struct gendisk *disk, int flag)
         struct disk_part_iter piter;
         struct hd_struct *part;
 
-        disk_part_iter_init(&piter, disk,
-                            DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0);
+        if (disk->part0.policy != flag) {
+                set_disk_ro_uevent(disk, flag);
+                disk->part0.policy = flag;
+        }
+
+        disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
         while ((part = disk_part_iter_next(&piter)))
                 part->policy = flag;
         disk_part_iter_exit(&piter);