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-rw-r--r--drivers/block/virtio_blk.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 559c322c4ffa..3b1a68d6eddb 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -9,8 +9,7 @@
#define VIRTIO_MAX_SG (3+MAX_PHYS_SEGMENTS)
#define PART_BITS 4
-static unsigned char virtblk_index = 'a';
-static int major, minor;
+static int major, index;
struct virtio_blk
{
@@ -171,6 +170,11 @@ static struct block_device_operations virtblk_fops = {
.getgeo = virtblk_getgeo,
};
+static int index_to_minor(int index)
+{
+ return index << PART_BITS;
+}
+
static int virtblk_probe(struct virtio_device *vdev)
{
struct virtio_blk *vblk;
@@ -178,7 +182,7 @@ static int virtblk_probe(struct virtio_device *vdev)
u64 cap;
u32 v;
- if (minor >= 1 << MINORBITS)
+ if (index_to_minor(index) >= 1 << MINORBITS)
return -ENOSPC;
vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
@@ -217,13 +221,24 @@ static int virtblk_probe(struct virtio_device *vdev)
goto out_put_disk;
}
- sprintf(vblk->disk->disk_name, "vd%c", virtblk_index++);
+ if (index < 26) {
+ sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26);
+ } else if (index < (26 + 1) * 26) {
+ sprintf(vblk->disk->disk_name, "vd%c%c",
+ 'a' + index / 26 - 1, 'a' + index % 26);
+ } else {
+ const unsigned int m1 = (index / 26 - 1) / 26 - 1;
+ const unsigned int m2 = (index / 26 - 1) % 26;
+ const unsigned int m3 = index % 26;
+ sprintf(vblk->disk->disk_name, "vd%c%c%c",
+ 'a' + m1, 'a' + m2, 'a' + m3);
+ }
+
vblk->disk->major = major;
- vblk->disk->first_minor = minor;
+ vblk->disk->first_minor = index_to_minor(index);
vblk->disk->private_data = vblk;
vblk->disk->fops = &virtblk_fops;
-
- minor += 1 << PART_BITS;
+ index++;
/* If barriers are supported, tell block layer that queue is ordered */
if (vdev->config->feature(vdev, VIRTIO_BLK_F_BARRIER))
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