From 0b9d9963b8f15a6f12a0149a62809fa9b846c5c5 Mon Sep 17 00:00:00 2001 From: David Teigland 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