From 0b9d9963b8f15a6f12a0149a62809fa9b846c5c5 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Tue, 30 Aug 2022 14:40:48 -0500
Subject: [PATCH 2/4] vgimportdevices: fix locking when creating devices file
Take the devices file lock before creating a new devices file.
(Was missed by the change to preemptively create the devices
file prior to setup_devices(), which was done to improve the
error path.)
---
lib/device/dev-cache.c | 7 +++----
lib/device/device_id.c | 1 +
tools/vgimportdevices.c | 10 ++++++++--
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/lib/device/dev-cache.c b/lib/device/dev-cache.c
index 65e1cb138..0c9aaf785 100644
--- a/lib/device/dev-cache.c
+++ b/lib/device/dev-cache.c
@@ -1956,10 +1956,9 @@ static int _setup_devices(struct cmd_context *cmd, int no_file_match)
if (!file_exists) {
/*
- * pvcreate/vgcreate/vgimportdevices/lvmdevices-add create
- * a new devices file here if it doesn't exist.
- * They have the create_edit_devices_file flag set.
- * First they create/lock-ex the devices file lockfile.
+ * pvcreate/vgcreate create a new devices file here if it
+ * doesn't exist. They have create_edit_devices_file=1.
+ * First create/lock-ex the devices file lockfile.
* Other commands will not use a devices file if none exists.
*/
lock_mode = LOCK_EX;
diff --git a/lib/device/device_id.c b/lib/device/device_id.c
index c3816a66c..780e08404 100644
--- a/lib/device/device_id.c
+++ b/lib/device/device_id.c
@@ -2429,6 +2429,7 @@ static int _lock_devices_file(struct cmd_context *cmd, int mode, int nonblock, i
if (_devices_file_locked == mode) {
/* can happen when a command holds an ex lock and does an update in device_ids_validate */
+ /* can happen when vgimportdevices calls this directly, followed later by setup_devices */
if (held)
*held = 1;
return 1;
diff --git a/tools/vgimportdevices.c b/tools/vgimportdevices.c
index 9ade1b9e4..23c2718ff 100644
--- a/tools/vgimportdevices.c
+++ b/tools/vgimportdevices.c
@@ -132,8 +132,10 @@ int vgimportdevices(struct cmd_context *cmd, int argc, char **argv)
return ECMD_FAILED;
/*
- * Prepare devices file preemptively because the error path for this
- * case from process_each is not as clean.
+ * Prepare/create devices file preemptively because the error path for
+ * this case from process_each/setup_devices is not as clean.
+ * This means that when setup_devices is called, it the devices
+ * file steps will be redundant, and need to handle being repeated.
*/
if (!setup_devices_file(cmd)) {
log_error("Failed to set up devices file.");
@@ -143,6 +145,10 @@ int vgimportdevices(struct cmd_context *cmd, int argc, char **argv)
log_error("Devices file not enabled.");
return ECMD_FAILED;
}
+ if (!lock_devices_file(cmd, LOCK_EX)) {
+ log_error("Failed to lock the devices file.");
+ return ECMD_FAILED;
+ }
if (!devices_file_exists(cmd)) {
if (!devices_file_touch(cmd)) {
log_error("Failed to create devices file.");
--
2.38.1