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69 lines
2.2 KiB
69 lines
2.2 KiB
From 66a54b266f6c579e5f37b6253820903a55c3346c Mon Sep 17 00:00:00 2001
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From: Shminderjit Singh <shminderjit.singh@oracle.com>
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Date: Tue, 4 Jun 2024 07:46:03 +0000
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Subject: [PATCH 105/157] mdadm: Fix socket connection failure when mdmon runs
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in foreground mode.
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While creating an IMSM RAID, mdadm will wait for the mdmon main process
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to finish if mdmon runs in forking mode. This is because with
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"Type=forking" in the mdmon service unit file, "systemctl start service"
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will block until the main process of mdmon exits. At that moment, mdmon
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has already created the socket, so the subsequent socket connect from
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mdadm will succeed.
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However, when mdmon runs in foreground mode (without "Type=forking" in
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the service unit file), "systemctl start service" will return once the
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mdmon process starts. This causes mdadm and mdmon to run in parallel,
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which may lead to a socket connection failure since mdmon has not yet
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initialized the socket when mdadm tries to connect. If the next
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instruction/command is to access this device and try to write to it, a
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permission error will occur since mdmon has not yet set the array to RW
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mode.
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Signed-off-by: Shminderjit Singh <shminderjit.singh@oracle.com>
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---
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msg.c | 20 +++++++++++++++++++-
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1 file changed, 19 insertions(+), 1 deletion(-)
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diff --git a/msg.c b/msg.c
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index ba0e25be..d17f679d 100644
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--- a/msg.c
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+++ b/msg.c
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@@ -151,6 +151,7 @@ int connect_monitor(char *devname)
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struct sockaddr_un addr;
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int pos;
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char *c;
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+ int rv, retry_count = 0;
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pos = sprintf(path, "%s/", MDMON_DIR);
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if (is_subarray(devname)) {
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@@ -170,7 +171,24 @@ int connect_monitor(char *devname)
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addr.sun_family = PF_LOCAL;
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strcpy(addr.sun_path, path);
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- if (connect(sfd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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+
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+ /* In foreground mode, when mdadm is trying to connect to control
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+ * socket it is possible that the mdmon has not created it yet.
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+ * Give some time to mdmon to create socket.
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+ */
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+ for (retry_count = 0; retry_count < 10; retry_count++) {
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+ rv = connect(sfd, (struct sockaddr*)&addr, sizeof(addr));
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+
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+ if (rv < 0) {
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+ sleep_for(0, MSEC_TO_NSEC(200), true);
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+ continue;
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+ }
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+ break;
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+ }
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+
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+ if (rv < 0) {
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+ pr_err("Failed to connect to control socket. (%s!!)\n",
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+ strerror(errno));
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close(sfd);
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return -1;
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}
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--
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2.41.0
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