block: automatically enable GENHD_FL_EXT_DEVT

Automatically set the GENHD_FL_EXT_DEVT flag for all disks allocated
without an explicit number of minors.  This is what all new block
drivers should do, so make sure it is the default without boilerplate
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210521055116.1053587-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

10 files changed, 2 insertions, 13 deletions

diff --git a/block/genhd.c b/block/genhd.c
index 8c1816d2929e..9fa734cb9cbd 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -497,7 +497,6 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk,
 		}
 	} else {
 		WARN_ON(disk->minors);
-		WARN_ON(!(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN)));
 
 		ret = blk_alloc_ext_minor();
 		if (ret < 0) {
@@ -506,6 +505,7 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk,
 		}
 		disk->major = BLOCK_EXT_MAJOR;
 		disk->first_minor = MINOR(ret);
+		disk->flags |= GENHD_FL_EXT_DEVT;
 	}
 
 	disk->flags |= GENHD_FL_UP;
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 504297bdc8bf..ada3e1e66989 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -326,10 +326,6 @@ static struct block_device *add_partition(struct gendisk *disk, int partno,
 	const char *dname;
 	int err;
 
-	/*
-	 * disk_max_parts() won't be zero, either GENHD_FL_EXT_DEVT is set
-	 * or 'minors' is passed to alloc_disk().
-	 */
 	if (partno >= disk_max_parts(disk))
 		return ERR_PTR(-EINVAL);
 
diff --git a/drivers/block/n64cart.c b/drivers/block/n64cart.c
index 47bdf324e962..3dae4b631dea 100644
--- a/drivers/block/n64cart.c
+++ b/drivers/block/n64cart.c
@@ -141,7 +141,7 @@ static int __init n64cart_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	disk->first_minor = 0;
-	disk->flags = GENHD_FL_NO_PART_SCAN | GENHD_FL_EXT_DEVT;
+	disk->flags = GENHD_FL_NO_PART_SCAN;
 	disk->fops = &n64cart_fops;
 	disk->private_data = &pdev->dev;
 	strcpy(disk->disk_name, "n64cart");
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 40a948c08a0b..e7dc539fc0ac 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -383,7 +383,6 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 	}
 
 	strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name));
-	tdisk->flags = GENHD_FL_EXT_DEVT;
 	tdisk->major = 0;
 	tdisk->first_minor = 0;
 	tdisk->fops = tt->bops;
diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index 8004dd64d09a..0bacf4268f83 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -2136,7 +2136,6 @@ static int msb_init_disk(struct memstick_dev *card)
 	msb->disk->fops = &msb_bdops;
 	msb->disk->private_data = msb;
 	msb->disk->queue = msb->queue;
-	msb->disk->flags |= GENHD_FL_EXT_DEVT;
 
 	capacity = msb->pages_in_block * msb->logical_block_count;
 	capacity *= (msb->page_size / 512);
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 7b9556291eb1..7ba446d224fb 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -267,7 +267,6 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
 	disk->first_minor	= 0;
 	disk->fops		= &nd_blk_fops;
 	disk->queue		= q;
-	disk->flags		= GENHD_FL_EXT_DEVT;
 	disk->private_data	= nsblk;
 	nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
 
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 18a267d5073f..1741a7b0b30f 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1537,7 +1537,6 @@ static int btt_blk_init(struct btt *btt)
 	btt->btt_disk->fops = &btt_fops;
 	btt->btt_disk->private_data = btt;
 	btt->btt_disk->queue = btt->btt_queue;
-	btt->btt_disk->flags = GENHD_FL_EXT_DEVT;
 
 	blk_queue_logical_block_size(btt->btt_queue, btt->sector_size);
 	blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index ed10a8b66068..968b8483c763 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -477,7 +477,6 @@ static int pmem_attach_disk(struct device *dev,
 
 	disk->fops		= &pmem_fops;
 	disk->queue		= q;
-	disk->flags		= GENHD_FL_EXT_DEVT;
 	disk->private_data	= pmem;
 	nvdimm_namespace_disk_name(ndns, disk->disk_name);
 	set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 762125f2905f..24bcae88587a 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3699,7 +3699,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid,
 	disk->fops = &nvme_bdev_ops;
 	disk->private_data = ns;
 	disk->queue = ns->queue;
-	disk->flags = GENHD_FL_EXT_DEVT;
 	/*
 	 * Without the multipath code enabled, multiple controller per
 	 * subsystems are visible as devices and thus we cannot use the
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index f81871c7128a..a5d02f236cca 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -462,7 +462,6 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
 	head->disk->fops = &nvme_ns_head_ops;
 	head->disk->private_data = head;
 	head->disk->queue = q;
-	head->disk->flags = GENHD_FL_EXT_DEVT;
 	sprintf(head->disk->disk_name, "nvme%dn%d",
 			ctrl->subsys->instance, head->instance);
 	return 0;