Patch "Revert "nvme: create 'slaves' and 'holders' entries for hidden controllers"" has been added to the 4.15-stable tree

Patch "Revert "nvme: create 'slaves' and 'holders' entries for hidden controllers"" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Revert "nvme: create 'slaves' and 'holders' entries for hidden controllers"

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-nvme-create-slaves-and-holders-entries-for-hidden-controllers.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 8a30ecc6e0ecbb9ae95daf499b2680b885ed0349 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 7 Mar 2018 14:13:58 +0100
Subject: Revert "nvme: create 'slaves' and 'holders' entries for hidden controllers"

From: Christoph Hellwig <hch@lst.de>

commit 8a30ecc6e0ecbb9ae95daf499b2680b885ed0349 upstream.

This reverts commit e9a48034d7d1318ece7d4a235838a86c94db9d68.

The slaves and holders link for the hidden gendisks confuse lsblk so that
it errors out on, or doesn't report the nvme multipath devices.  Given
that we don't need holder relationships for something that can't even be
directly accessed we should just stop creating those links.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Potnuri Bharat Teja <bharat@chelsio.com>
Cc: stable@vger.kernel.org
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/nvme/host/core.c      |    2 --
 drivers/nvme/host/multipath.c |   30 ------------------------------
 drivers/nvme/host/nvme.h      |    8 --------
 3 files changed, 40 deletions(-)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2950,7 +2950,6 @@ static void nvme_alloc_ns(struct nvme_ct
 
 	if (new)
 		nvme_mpath_add_disk(ns->head);
-	nvme_mpath_add_disk_links(ns);
 	return;
  out_unlink_ns:
 	mutex_lock(&ctrl->subsys->lock);
@@ -2970,7 +2969,6 @@ static void nvme_ns_remove(struct nvme_n
 		return;
 
 	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
-		nvme_mpath_remove_disk_links(ns);
 		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
 					&nvme_ns_id_attr_group);
 		if (ns->ndev)
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -245,25 +245,6 @@ void nvme_mpath_add_disk(struct nvme_ns_
 			head->disk->disk_name);
 }
 
-void nvme_mpath_add_disk_links(struct nvme_ns *ns)
-{
-	struct kobject *slave_disk_kobj, *holder_disk_kobj;
-
-	if (!ns->head->disk)
-		return;
-
-	slave_disk_kobj = &disk_to_dev(ns->disk)->kobj;
-	if (sysfs_create_link(ns->head->disk->slave_dir, slave_disk_kobj,
-			kobject_name(slave_disk_kobj)))
-		return;
-
-	holder_disk_kobj = &disk_to_dev(ns->head->disk)->kobj;
-	if (sysfs_create_link(ns->disk->part0.holder_dir, holder_disk_kobj,
-			kobject_name(holder_disk_kobj)))
-		sysfs_remove_link(ns->head->disk->slave_dir,
-			kobject_name(slave_disk_kobj));
-}
-
 void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 {
 	if (!head->disk)
@@ -278,14 +259,3 @@ void nvme_mpath_remove_disk(struct nvme_
 	blk_cleanup_queue(head->disk->queue);
 	put_disk(head->disk);
 }
-
-void nvme_mpath_remove_disk_links(struct nvme_ns *ns)
-{
-	if (!ns->head->disk)
-		return;
-
-	sysfs_remove_link(ns->disk->part0.holder_dir,
-			kobject_name(&disk_to_dev(ns->head->disk)->kobj));
-	sysfs_remove_link(ns->head->disk->slave_dir,
-			kobject_name(&disk_to_dev(ns->disk)->kobj));
-}
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -405,9 +405,7 @@ bool nvme_req_needs_failover(struct requ
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 void nvme_mpath_add_disk(struct nvme_ns_head *head);
-void nvme_mpath_add_disk_links(struct nvme_ns *ns);
 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
-void nvme_mpath_remove_disk_links(struct nvme_ns *ns);
 
 static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
 {
@@ -448,12 +446,6 @@ static inline void nvme_mpath_add_disk(s
 static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 {
 }
-static inline void nvme_mpath_add_disk_links(struct nvme_ns *ns)
-{
-}
-static inline void nvme_mpath_remove_disk_links(struct nvme_ns *ns)
-{
-}
 static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns)
 {
 }


Patches currently in stable-queue which might be from hch@lst.de are

queue-4.15/loop-fix-lost-writes-caused-by-missing-flag.patch
queue-4.15/revert-nvme-create-slaves-and-holders-entries-for-hidden-controllers.patch