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From 164bd929f1c85026f21ed493d11d3b4d1b94421d Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Wed, 17 Jan 2018 09:13:24 +0100
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Subject: [PATCH] automount: ack automount requests even when already mounted
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If a process accesses an autofs filesystem while systemd is in the
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middle of starting the mount unit on top of it, it is possible for the
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autofs_ptype_missing_direct request from the kernel to be received after
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the mount unit has been fully started:
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systemd forks and execs mount ...
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... access autofs, blocks
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mount exits ...
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systemd receives SIGCHLD ...
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... kernel sends request
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systemd receives request ...
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systemd needs to respond to this request, otherwise the kernel will
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continue to block access to the mount point.
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(cherry picked from commit e7d54bf58789545a9eb0b3964233defa0b007318)
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Resolves: #1535135
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---
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src/core/automount.c | 28 ++++++++++++++++------------
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1 file changed, 16 insertions(+), 12 deletions(-)
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diff --git a/src/core/automount.c b/src/core/automount.c
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index 4e066613d..9e05963e9 100644
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--- a/src/core/automount.c
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+++ b/src/core/automount.c
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@@ -692,7 +692,7 @@ static int automount_start_expire(Automount *a) {
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automount_dispatch_expire, a);
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}
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-static void automount_enter_runnning(Automount *a) {
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+static void automount_enter_running(Automount *a) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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struct stat st;
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int r;
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@@ -718,18 +718,22 @@ static void automount_enter_runnning(Automount *a) {
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goto fail;
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}
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- if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
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+ /* The mount unit may have been explicitly started before we got the
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+ * autofs request. Ack it to unblock anything waiting on the mount point. */
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+ if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id) {
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log_unit_info(UNIT(a)->id,
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"%s's automount point already active?", UNIT(a)->id);
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- else {
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- r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_TRIGGER(UNIT(a)),
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- JOB_REPLACE, true, &error, NULL);
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- if (r < 0) {
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- log_unit_warning(UNIT(a)->id,
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- "%s failed to queue mount startup job: %s",
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- UNIT(a)->id, bus_error_message(&error, r));
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- goto fail;
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- }
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+ automount_send_ready(a, a->tokens, 0);
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+ return;
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+ }
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+
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+ r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_TRIGGER(UNIT(a)),
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+ JOB_REPLACE, true, &error, NULL);
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+ if (r < 0) {
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+ log_unit_warning(UNIT(a)->id,
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+ "%s failed to queue mount startup job: %s",
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+ UNIT(a)->id, bus_error_message(&error, r));
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+ goto fail;
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}
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r = automount_start_expire(a);
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@@ -953,7 +957,7 @@ static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, vo
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goto fail;
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}
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- automount_enter_runnning(a);
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+ automount_enter_running(a);
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break;
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case autofs_ptype_expire_direct:
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