Driver Core: block: add nodename support for block drivers.

[safe/jmp/linux-2.6] / block / genhd.c

diff --git a/block/genhd.c b/block/genhd.c
index e1eadcc..f4c64c2 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -98,7 +98,7 @@ void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk,
 
        if (flags & DISK_PITER_REVERSE)
                piter->idx = ptbl->len - 1;
-       else if (flags & DISK_PITER_INCL_PART0)
+       else if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0))
                piter->idx = 0;
        else
                piter->idx = 1;
@@ -134,7 +134,8 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
        /* determine iteration parameters */
        if (piter->flags & DISK_PITER_REVERSE) {
                inc = -1;
-               if (piter->flags & DISK_PITER_INCL_PART0)
+               if (piter->flags & (DISK_PITER_INCL_PART0 |
+                                   DISK_PITER_INCL_EMPTY_PART0))
                        end = -1;
                else
                        end = 0;
@@ -150,7 +151,10 @@ struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
                part = rcu_dereference(ptbl->part[piter->idx]);
                if (!part)
                        continue;
-               if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects)
+               if (!part->nr_sects &&
+                   !(piter->flags & DISK_PITER_INCL_EMPTY) &&
+                   !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 &&
+                     piter->idx == 0))
                        continue;
 
                get_device(part_to_dev(part));
@@ -256,6 +260,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
 }
 #endif /* CONFIG_PROC_FS */
 
+/**
+ * register_blkdev - register a new block device
+ *
+ * @major: the requested major device number [1..255]. If @major=0, try to
+ *         allocate any unused major number.
+ * @name: the name of the new block device as a zero terminated string
+ *
+ * The @name must be unique within the system.
+ *
+ * The return value depends on the @major input parameter.
+ *  - if a major device number was requested in range [1..255] then the
+ *    function returns zero on success, or a negative error code
+ *  - if any unused major number was requested with @major=0 parameter
+ *    then the return value is the allocated major number in range
+ *    [1..255] or a negative error code otherwise
+ */
 int register_blkdev(unsigned int major, const char *name)
 {
        struct blk_major_name **n, *p;
@@ -832,11 +852,21 @@ static ssize_t disk_capability_show(struct device *dev,
        return sprintf(buf, "%x\n", disk->flags);
 }
 
+static ssize_t disk_alignment_offset_show(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+
+       return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue));
+}
+
 static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
 static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_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, 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);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -855,6 +885,7 @@ static struct attribute *disk_attrs[] = {
        &dev_attr_removable.attr,
        &dev_attr_ro.attr,
        &dev_attr_size.attr,
+       &dev_attr_alignment_offset.attr,
        &dev_attr_capability.attr,
        &dev_attr_stat.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -965,10 +996,20 @@ struct class block_class = {
        .name           = "block",
 };
 
+static char *block_nodename(struct device *dev)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+
+       if (disk->nodename)
+               return disk->nodename(disk);
+       return NULL;
+}
+
 static struct device_type disk_type = {
        .name           = "disk",
        .groups         = disk_attr_groups,
        .release        = disk_release,
+       .nodename       = block_nodename,
 };
 
 #ifdef CONFIG_PROC_FS
@@ -995,7 +1036,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
                                "\n\n");
        */
  
-       disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0);
+       disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0);
        while ((hd = disk_part_iter_next(&piter))) {
                cpu = part_stat_lock();
                part_round_stats(cpu, hd);