linux-next: manual merge of the block tree with the rr tree

linux-next: manual merge of the block tree with the rr tree

[Stephen Rothwell]

Hi Jens,

Today's linux-next merge of the block tree got a conflict in
drivers/block/virtio_blk.c between commit
0e41b2d3ea0f5bf472a2b163c54305f62ab7b776 ("virtio_blk: support barriers
without FLUSH feature") from the rr tree and commits
3789fdefa13bcaa7ad06d952ac6010f0a81bf04e ("virtio_blk: stop using
q->prepare_flush_fn") and 5e27e27e73b5bff903b3c30ffd5a0e17eb95c087
("block: remove q->prepare_flush_fn completely") from the block tree.

I fixed it up (see below) and can carry the fix as necessary.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

diff --cc drivers/block/virtio_blk.c
index 23b7c48,0a3222f..0000000
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@@ -377,32 -364,11 +375,31 @@@ static int __devinit virtblk_probe(stru
  	vblk->disk->driverfs_dev = &vdev->dev;
  	index++;
  
 -	/* If barriers are supported, tell block layer that queue is ordered */
 -	if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH))
 +	if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) {
 +		/*
 +		 * If the FLUSH feature is supported we do have support for
 +		 * flushing a volatile write cache on the host.  Use that
 +		 * to implement write barrier support.
 +		 */
- 		blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH,
- 				  virtblk_prepare_flush);
+ 		blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH);
 -	else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER))
 +	} else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) {
 +		/*
 +		 * If the BARRIER feature is supported the host expects us
 +		 * to order request by tags.  This implies there is not
 +		 * volatile write cache on the host, and that the host
 +		 * never re-orders outstanding I/O.  This feature is not
 +		 * useful for real life scenarious and deprecated.
 +		 */
- 		blk_queue_ordered(q, QUEUE_ORDERED_TAG, NULL);
+ 		blk_queue_ordered(q, QUEUE_ORDERED_TAG);
 +	} else {
 +		/*
 +		 * If the FLUSH feature is not supported we must assume that
 +		 * the host does not perform any kind of volatile write
 +		 * caching. We still need to drain the queue to provider
 +		 * proper barrier semantics.
 +		 */
- 		blk_queue_ordered(q, QUEUE_ORDERED_DRAIN, NULL);
++		blk_queue_ordered(q, QUEUE_ORDERED_DRAIN);
 +	}
  
  	/* If disk is read-only in the host, the guest should obey */
  	if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))

linux-next: manual merge of the block tree with the rr tree

[Stephen Rothwell]

Hi Jens,

Today's linux-next merge of the block tree got conflicts in
drivers/block/virtio_blk.c and include/linux/virtio_blk.h between commit
a69a9b05d1050c24767d438bbe220157b7ff9250 ("Add serial number support for
virtio_blk, V4a") from the rr tree and commit
1cde26f928863d90e9e7c1217880c8450464d305 ("virtio_blk: SG_IO passthru
support") from the block tree.

I fixed it up (see below) and can carry the fix as necessary.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

diff --cc drivers/block/virtio_blk.c
index ad8cb22,c4845b1..0000000
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@@ -178,14 -175,16 +203,22 @@@ static int virtblk_ioctl(struct block_d
  			 unsigned cmd, unsigned long data)
  {
  	struct gendisk *disk = bdev->bd_disk;
 +	void __user *argp = (void __user *)data;
+ 	struct virtio_blk *vblk = disk->private_data;
  
 -	/*
 -	 * Only allow the generic SCSI ioctls if the host can support it.
 -	 */
 -	if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
 -		return -ENOIOCTLCMD;
 -
 -	return scsi_cmd_ioctl(disk->queue, disk, mode, cmd,
 -			      (void __user *)data);
 +	switch (cmd) {
 +	case HDIO_GET_IDENTITY:
 +		return virtblk_identify(disk, argp);
 +	default:
++		/*
++		 * Only allow the generic SCSI ioctls if the host
++		 * can support it.
++		 */
++		if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
++			return -ENOIOCTLCMD;
++
 +		return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
 +	}
  }
  
  /* We provide getgeo only to please some old bootloader/partitioning tools */
@@@ -390,7 -390,7 +424,7 @@@ static struct virtio_device_id id_table
  static unsigned int features[] = {
  	VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX,
  	VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
- 	VIRTIO_BLK_F_IDENTIFY
 -	VIRTIO_BLK_F_SCSI,
++	VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY,
  };
  
  static struct virtio_driver virtio_blk = {
diff --cc include/linux/virtio_blk.h
index eb470d5,4dbcbc1..0000000
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@@ -15,9 -15,7 +15,10 @@@
  #define VIRTIO_BLK_F_GEOMETRY	4	/* Legacy geometry available  */
  #define VIRTIO_BLK_F_RO		5	/* Disk is read-only */
  #define VIRTIO_BLK_F_BLK_SIZE	6	/* Block size of disk is available*/
+ #define VIRTIO_BLK_F_SCSI	7	/* Supports scsi command passthru */
 +#define VIRTIO_BLK_F_IDENTIFY	8	/* ATA IDENTIFY supported */
 +
 +#define VIRTIO_BLK_ID_BYTES	(sizeof(__u16[256]))	/* IDENTIFY DATA */
  
  struct virtio_blk_config
  {