block: export "ro" attribute

[linux-2.6-omap-h63xx.git] / block / genhd.c

diff --git a/block/genhd.c b/block/genhd.c
index 00da5219ee37c02a066d45e6ceefa65d9606d5e6..43e468ee59933a11a6b03d22f1bb7dc45d4aebff 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -182,11 +182,17 @@ static int exact_lock(dev_t devt, void *data)
  */
 void add_disk(struct gendisk *disk)
 {
+       struct backing_dev_info *bdi;
+
        disk->flags |= GENHD_FL_UP;
        blk_register_region(MKDEV(disk->major, disk->first_minor),
                            disk->minors, NULL, exact_match, exact_lock, disk);
        register_disk(disk);
        blk_register_queue(disk);
+
+       bdi = &disk->queue->backing_dev_info;
+       bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor));
+       sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi");
 }
 
 EXPORT_SYMBOL(add_disk);
@@ -194,6 +200,8 @@ EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */
 
 void unlink_gendisk(struct gendisk *disk)
 {
+       sysfs_remove_link(&disk->dev.kobj, "bdi");
+       bdi_unregister(&disk->queue->backing_dev_info);
        blk_unregister_queue(disk);
        blk_unregister_region(MKDEV(disk->major, disk->first_minor),
                              disk->minors);
@@ -392,6 +400,14 @@ static ssize_t disk_removable_show(struct device *dev,
                       (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
 }
 
+static ssize_t disk_ro_show(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+
+       return sprintf(buf, "%d\n", disk->policy ? 1 : 0);
+}
+
 static ssize_t disk_size_show(struct device *dev,
                              struct device_attribute *attr, char *buf)
 {
@@ -464,6 +480,7 @@ static ssize_t disk_fail_store(struct device *dev,
 
 static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
 static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
+static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
 static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL);
 static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
 static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL);
@@ -475,6 +492,7 @@ static struct device_attribute dev_attr_fail =
 static struct attribute *disk_attrs[] = {
        &dev_attr_range.attr,
        &dev_attr_removable.attr,
+       &dev_attr_ro.attr,
        &dev_attr_size.attr,
        &dev_attr_capability.attr,
        &dev_attr_stat.attr,
@@ -645,15 +663,21 @@ void genhd_media_change_notify(struct gendisk *disk)
 EXPORT_SYMBOL_GPL(genhd_media_change_notify);
 #endif  /*  0  */
 
-dev_t blk_lookup_devt(const char *name)
+dev_t blk_lookup_devt(const char *name, int part)
 {
        struct device *dev;
        dev_t devt = MKDEV(0, 0);
 
        mutex_lock(&block_class_lock);
        list_for_each_entry(dev, &block_class.devices, node) {
+               if (dev->type != &disk_type)
+                       continue;
                if (strcmp(dev->bus_id, name) == 0) {
-                       devt = dev->devt;
+                       struct gendisk *disk = dev_to_disk(dev);
+
+                       if (part < disk->minors)
+                               devt = MKDEV(MAJOR(dev->devt),
+                                            MINOR(dev->devt) + part);
                        break;
                }
        }
@@ -661,7 +685,6 @@ dev_t blk_lookup_devt(const char *name)
 
        return devt;
 }
-
 EXPORT_SYMBOL(blk_lookup_devt);
 
 struct gendisk *alloc_disk(int minors)