[PATCH 4.9 34/67] libnvdimm, {btt, blk}: do integrity setup before add_disk()

From: Greg Kroah-Hartman
Date: Tue Mar 27 2018 - 12:31:59 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Vishal Verma <vishal.l.verma@xxxxxxxxx>

commit 3ffb0ba9b567a8efb9a04ed3d1ec15ff333ada22 upstream.

Prior to 25520d55cdb6 ("block: Inline blk_integrity in struct gendisk")
we needed to temporarily add a zero-capacity disk before registering for
blk-integrity. But adding a zero-capacity disk caused the partition
table scanning to bail early, and this resulted in partitions not coming
up after a probe of the BTT or blk namespaces.

We can now register for integrity before the disk has been added, and
this fixes the rescan problems.

Fixes: 25520d55cdb6 ("block: Inline blk_integrity in struct gendisk")
Reported-by: Dariusz Dokupil <dariusz.dokupil@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/nvdimm/blk.c | 3 +--
drivers/nvdimm/btt.c | 3 +--
2 files changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -286,8 +286,6 @@ static int nsblk_attach_disk(struct nd_n
disk->queue = q;
disk->flags = GENHD_FL_EXT_DEVT;
nvdimm_namespace_disk_name(&nsblk->common, disk->disk_name);
- set_capacity(disk, 0);
- device_add_disk(dev, disk);

if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk))
return -ENOMEM;
@@ -300,6 +298,7 @@ static int nsblk_attach_disk(struct nd_n
}

set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
+ device_add_disk(dev, disk);
revalidate_disk(disk);
return 0;
}
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1392,8 +1392,6 @@ static int btt_blk_init(struct btt *btt)
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, btt->btt_queue);
btt->btt_queue->queuedata = btt;

- set_capacity(btt->btt_disk, 0);
- device_add_disk(&btt->nd_btt->dev, btt->btt_disk);
if (btt_meta_size(btt)) {
int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt));

@@ -1405,6 +1403,7 @@ static int btt_blk_init(struct btt *btt)
}
}
set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
+ device_add_disk(&btt->nd_btt->dev, btt->btt_disk);
btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
revalidate_disk(btt->btt_disk);