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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Uday Shankar <ushankar@purestorage.com>
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Date: Wed, 9 Mar 2022 13:03:26 -0700
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Subject: [PATCH] multipath-tools: update mpp->force_readonly in ev_add_path
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When NVMe disks are added to the system, no uevent containing the
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DISK_RO property is generated. As a result, dm-* nodes backed by
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readonly NVMe disks will not have their RO state set properly. The
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result looks like this:
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$ multipath -l
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eui.00c92c091fd6564424a9376600011bd1 dm-3 NVME,Pure Storage FlashArray
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size=1.0T features='0' hwhandler='0' wp=rw
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|-+- policy='service-time 0' prio=0 status=active
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| `- 0:2:2:72657 nvme0n2 259:4 active undef running
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`-+- policy='service-time 0' prio=0 status=enabled
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`- 1:0:2:72657 nvme1n2 259:1 active undef running
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$ cat /sys/block/dm-3/ro
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0
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$ cat /sys/block/nvme*n2/ro
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1
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1
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This is not a problem for SCSI disks, since the kernel will emit change
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uevents containing the DISK_RO property when the disk is added to the
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system. See the following thread for my initial attempt to fix this
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issue at the kernel level:
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https://lore.kernel.org/linux-block/Yib8GqCA5e3SQYty@infradead.org/T/#t
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Fix the issue by picking up the path ro state from sysfs in ev_add_path,
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setting the mpp->force_readonly accordingly, and changing
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dm_addmap_create to be aware of mpp->force_readonly.
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Signed-off-by: Uday Shankar <ushankar@purestorage.com>
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Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/devmapper.c | 2 +-
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multipathd/main.c | 6 ++++++
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2 files changed, 7 insertions(+), 1 deletion(-)
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diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
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index c05dc201..1ff75c81 100644
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--- a/libmultipath/devmapper.c
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+++ b/libmultipath/devmapper.c
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@@ -542,7 +542,7 @@ int dm_addmap_create (struct multipath *mpp, char * params)
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int ro;
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uint16_t udev_flags = build_udev_flags(mpp, 0);
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- for (ro = 0; ro <= 1; ro++) {
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+ for (ro = mpp->force_readonly ? 1 : 0; ro <= 1; ro++) {
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int err;
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if (dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, params, ro,
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diff --git a/multipathd/main.c b/multipathd/main.c
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index 45b9572f..ed2515e5 100644
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--- a/multipathd/main.c
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+++ b/multipathd/main.c
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@@ -1048,6 +1048,7 @@ ev_add_path (struct path * pp, struct vectors * vecs, int need_do_map)
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int retries = 3;
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int start_waiter = 0;
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int ret;
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+ int ro;
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/*
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* need path UID to go any further
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@@ -1112,6 +1113,11 @@ rescan:
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/* persistent reservation check*/
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mpath_pr_event_handle(pp);
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+ /* ro check - if new path is ro, force map to be ro as well */
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+ ro = sysfs_get_ro(pp);
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+ if (ro == 1)
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+ mpp->force_readonly = 1;
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+
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if (!need_do_map)
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return 0;
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