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From e2308733910a157b0a4d4e78721f239d44b91a24 Mon Sep 17 00:00:00 2001
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From: Mariusz Tkaczyk <mariusz.tkaczyk@intel.com>
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Date: Wed, 9 Sep 2020 10:31:17 +0200
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Subject: [PATCH 092/108] Monitor: refresh mdstat fd after select
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After 52209d6ee118 ("Monitor: release /proc/mdstat fd when no arrays
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present") mdstat fd is closed if mdstat is empty or cannot be opened.
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It causes that monitor is not able to select on mdstat. Select
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doesn't fail because it gets valid descriptor to a different resource.
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As a result any new event will be unnoticed until timeout (delay).
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Refresh mdstat after wake up, don't poll on wrong resource.
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Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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Monitor.c | 6 +++---
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mdstat.c | 4 ++--
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2 files changed, 5 insertions(+), 5 deletions(-)
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diff --git a/Monitor.c b/Monitor.c
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index 2d6b3b9..80a3200 100644
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--- a/Monitor.c
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+++ b/Monitor.c
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@@ -216,8 +216,6 @@ int Monitor(struct mddev_dev *devlist,
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if (mdstat)
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free_mdstat(mdstat);
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mdstat = mdstat_read(oneshot ? 0 : 1, 0);
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- if (!mdstat)
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- mdstat_close();
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for (st = statelist; st; st = st->next)
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if (check_array(st, mdstat, c->test, &info,
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@@ -238,8 +236,10 @@ int Monitor(struct mddev_dev *devlist,
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if (!new_found) {
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if (oneshot)
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break;
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- else
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+ else {
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mdstat_wait(c->delay);
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+ mdstat_close();
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+ }
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}
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c->test = 0;
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diff --git a/mdstat.c b/mdstat.c
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index 20577a3..48559e6 100644
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--- a/mdstat.c
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+++ b/mdstat.c
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@@ -135,7 +135,6 @@ struct mdstat_ent *mdstat_read(int hold, int start)
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if (hold && mdstat_fd != -1) {
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off_t offset = lseek(mdstat_fd, 0L, 0);
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if (offset == (off_t)-1) {
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- mdstat_close();
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return NULL;
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}
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fd = dup(mdstat_fd);
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@@ -312,7 +311,8 @@ void mdstat_wait(int seconds)
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if (mdstat_fd >= 0) {
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FD_SET(mdstat_fd, &fds);
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maxfd = mdstat_fd;
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- }
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+ } else
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+ return;
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tm.tv_sec = seconds;
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tm.tv_usec = 0;
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select(maxfd + 1, NULL, NULL, &fds, &tm;;
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--
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2.7.5
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