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From cab9c67d461c65a1138359f9f6d39636466b90e4 Mon Sep 17 00:00:00 2001
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From: Blazej Kucman <blazej.kucman@intel.com>
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Date: Wed, 9 Sep 2020 10:31:19 +0200
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Subject: [PATCH 094/108] mdmonitor: set small delay once
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If mdmonitor is awakened by event, set small delay once
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to deal with udev and mdadm.
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Signed-off-by: Blazej Kucman <blazej.kucman@intel.com>
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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 | 14 +++++++++++++-
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mdadm.h | 2 +-
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mdstat.c | 18 +++++++++++++++---
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3 files changed, 29 insertions(+), 5 deletions(-)
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diff --git a/Monitor.c b/Monitor.c
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index aed7a69..0fb4f77 100644
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--- a/Monitor.c
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+++ b/Monitor.c
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@@ -128,6 +128,7 @@ int Monitor(struct mddev_dev *devlist,
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char *mailfrom;
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struct alert_info info;
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struct mddev_ident *mdlist;
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+ int delay_for_event = c->delay;
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if (!mailaddr) {
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mailaddr = conf_get_mailaddr();
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@@ -249,7 +250,18 @@ int Monitor(struct mddev_dev *devlist,
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break;
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}
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else {
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- mdstat_wait(c->delay);
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+ int wait_result = mdstat_wait(delay_for_event);
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+
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+ /*
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+ * If mdmonitor is awaken by event, set small delay once
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+ * to deal with udev and mdadm.
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+ */
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+ if (wait_result != 0) {
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+ if (c->delay > 5)
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+ delay_for_event = 5;
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+ } else
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+ delay_for_event = c->delay;
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+
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mdstat_close();
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}
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}
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diff --git a/mdadm.h b/mdadm.h
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index 399478b..4961c0f 100644
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--- a/mdadm.h
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+++ b/mdadm.h
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@@ -628,7 +628,7 @@ struct mdstat_ent {
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extern struct mdstat_ent *mdstat_read(int hold, int start);
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extern void mdstat_close(void);
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extern void free_mdstat(struct mdstat_ent *ms);
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-extern void mdstat_wait(int seconds);
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+extern int mdstat_wait(int seconds);
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extern void mdstat_wait_fd(int fd, const sigset_t *sigmask);
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extern int mddev_busy(char *devnm);
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extern struct mdstat_ent *mdstat_by_component(char *name);
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diff --git a/mdstat.c b/mdstat.c
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index 48559e6..dd96cca 100644
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--- a/mdstat.c
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+++ b/mdstat.c
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@@ -302,7 +302,17 @@ void mdstat_close(void)
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mdstat_fd = -1;
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}
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-void mdstat_wait(int seconds)
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+/*
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+ * function: mdstat_wait
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+ * Description: Function waits for event on mdstat.
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+ * Parameters:
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+ * seconds - timeout for waiting
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+ * Returns:
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+ * > 0 - detected event
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+ * 0 - timeout
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+ * < 0 - detected error
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+ */
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+int mdstat_wait(int seconds)
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{
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fd_set fds;
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struct timeval tm;
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@@ -312,10 +322,12 @@ void mdstat_wait(int seconds)
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FD_SET(mdstat_fd, &fds);
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maxfd = mdstat_fd;
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} else
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- return;
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+ return -1;
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+
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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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+ return select(maxfd + 1, NULL, NULL, &fds, &tm;;
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}
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void mdstat_wait_fd(int fd, const sigset_t *sigmask)
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--
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2.7.5
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