74 lines
2.9 KiB
Diff
74 lines
2.9 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Tue, 21 Jul 2020 01:19:30 -0500
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Subject: [PATCH] libmultipath: count pending paths as active on loads
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When multipath loads a table, it signals to udev if there are no active
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paths. Multipath wasn't counting pending paths as active. This meant
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that if all the paths were pending, udev would treat the device as not
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ready, and not run kpartx on it. Even if the pending paths later
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because active and were reinstated, the kernel would not send a new
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uevent, because from its point of view, they were always up.
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The alternative would be to continue to treat them as failed in the udev
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rules, but then also tell the kernel that they were down, so that it
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would trigger a uevent when they were reinstated. However, this could
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lead to newly created multipath devices failing IO, simply because the
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path checkers hadn't returned yet. Having udev assume that the the
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device is up, like the kernel does, seems like the safer option.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/devmapper.c | 3 ++-
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libmultipath/structs.c | 7 +++++++
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libmultipath/structs.h | 1 +
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3 files changed, 10 insertions(+), 1 deletion(-)
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diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
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index f597ff8b..126cd728 100644
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--- a/libmultipath/devmapper.c
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+++ b/libmultipath/devmapper.c
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@@ -417,7 +417,8 @@ static uint16_t build_udev_flags(const struct multipath *mpp, int reload)
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/* DM_UDEV_DISABLE_LIBRARY_FALLBACK is added in dm_addmap */
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return (mpp->skip_kpartx == SKIP_KPARTX_ON ?
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MPATH_UDEV_NO_KPARTX_FLAG : 0) |
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- ((count_active_paths(mpp) == 0 || mpp->ghost_delay_tick > 0) ?
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+ ((count_active_pending_paths(mpp) == 0 ||
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+ mpp->ghost_delay_tick > 0) ?
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MPATH_UDEV_NO_PATHS_FLAG : 0) |
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(reload && !mpp->force_udev_reload ?
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MPATH_UDEV_RELOAD_FLAG : 0);
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diff --git a/libmultipath/structs.c b/libmultipath/structs.c
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index 3eac3d61..0d1f969d 100644
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--- a/libmultipath/structs.c
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+++ b/libmultipath/structs.c
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@@ -491,6 +491,13 @@ int count_active_paths(const struct multipath *mpp)
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return do_pathcount(mpp, states, 2);
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}
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+int count_active_pending_paths(const struct multipath *mpp)
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+{
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+ int states[] = {PATH_UP, PATH_GHOST, PATH_PENDING};
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+
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+ return do_pathcount(mpp, states, 3);
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+}
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+
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int pathcmp(const struct pathgroup *pgp, const struct pathgroup *cpgp)
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{
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int i, j;
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diff --git a/libmultipath/structs.h b/libmultipath/structs.h
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index 0c03e711..917e4083 100644
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--- a/libmultipath/structs.h
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+++ b/libmultipath/structs.h
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@@ -448,6 +448,7 @@ struct path * first_path (const struct multipath *mpp);
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int pathcount (const struct multipath *, int);
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int count_active_paths(const struct multipath *);
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+int count_active_pending_paths(const struct multipath *);
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int pathcmp (const struct pathgroup *, const struct pathgroup *);
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int add_feature (char **, const char *);
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int remove_feature (char **, const char *);
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--
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2.17.2
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