From: Luis Chamberlain <mcgrof@kernel.org>
To: axboe@kernel.dk, colyli@suse.de, kent.overstreet@gmail.com,
kbusch@kernel.org, sagi@grimberg.me, vishal.l.verma@intel.com,
dan.j.williams@intel.com, dave.jiang@intel.com,
ira.weiny@intel.com, konrad.wilk@oracle.com,
roger.pau@citrix.com, boris.ostrovsky@oracle.com,
jgross@suse.com, sstabellini@kernel.org, minchan@kernel.org,
ngupta@vflare.org, senozhatsky@chromium.org
Cc: xen-devel@lists.xenproject.org, nvdimm@lists.linux.dev,
linux-nvme@lists.infradead.org, linux-bcache@vger.kernel.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
Luis Chamberlain <mcgrof@kernel.org>
Subject: [PATCH v2 03/10] nvme-multipath: add error handling support for add_disk()
Date: Mon, 27 Sep 2021 15:00:32 -0700 [thread overview]
Message-ID: <20210927220039.1064193-4-mcgrof@kernel.org> (raw)
In-Reply-To: <20210927220039.1064193-1-mcgrof@kernel.org>
We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.
Since we now can tell for sure when a disk was added, move
setting the bit NVME_NSHEAD_DISK_LIVE only when we did
add the disk successfully.
Nothing to do here as the cleanup is done elsewhere. We take
care and use test_and_set_bit() because it is protects against
two nvme paths simultaneously calling device_add_disk() on the
same namespace head.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
drivers/nvme/host/multipath.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index e8ccdd398f78..35cace4f3f5f 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -496,13 +496,22 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
static void nvme_mpath_set_live(struct nvme_ns *ns)
{
struct nvme_ns_head *head = ns->head;
+ int rc;
if (!head->disk)
return;
+ /*
+ * test_and_set_bit() is used because it is protecting against two nvme
+ * paths simultaneously calling device_add_disk() on the same namespace
+ * head.
+ */
if (!test_and_set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags)) {
- device_add_disk(&head->subsys->dev, head->disk,
- nvme_ns_id_attr_groups);
+ rc = device_add_disk(&head->subsys->dev, head->disk,
+ nvme_ns_id_attr_groups);
+ if (rc)
+ return;
+ set_bit(NVME_NSHEAD_DISK_LIVE, &head->flags);
nvme_add_ns_head_cdev(head);
}
--
2.30.2
next prev parent reply other threads:[~2021-09-27 22:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 22:00 [PATCH v2 00/10] block: second batch of add_disk() error handling conversions Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 01/10] block/brd: add error handling support for add_disk() Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 02/10] bcache: " Luis Chamberlain
2021-09-27 22:00 ` Luis Chamberlain [this message]
2021-09-27 22:13 ` [PATCH v2 03/10] nvme-multipath: " Keith Busch
2021-09-28 5:39 ` Hannes Reinecke
2021-09-27 22:00 ` [PATCH v2 04/10] nvdimm/btt: do not call del_gendisk() if not needed Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 05/10] nvdimm/btt: use goto error labels on btt_blk_init() Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 06/10] nvdimm/btt: add error handling support for add_disk() Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 07/10] nvdimm/blk: avoid calling del_gendisk() on early failures Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 08/10] nvdimm/blk: add error handling support for add_disk() Luis Chamberlain
2021-09-27 22:00 ` [PATCH v2 09/10] xen-blkfront: " Luis Chamberlain
2021-09-30 13:07 ` Juergen Gross
2021-09-27 22:00 ` [PATCH v2 10/10] zram: " Luis Chamberlain
2021-09-27 22:33 ` [PATCH v2 00/10] block: second batch of add_disk() error handling conversions Jens Axboe
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