* rhel-8.8.0 - vgimportdevices: fix locking when creating devices file
@ 2022-11-08 14:51 David Teigland
0 siblings, 0 replies; 2+ messages in thread
From: David Teigland @ 2022-11-08 14:51 UTC (permalink / raw)
To: lvm-devel
Gitweb: https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=19093e37557ae6a94392dcf207b3566a7d3defea
Commit: 19093e37557ae6a94392dcf207b3566a7d3defea
Parent: e5f5e2988377c0f014b30a60709685c19c6d3bf0
Author: David Teigland <teigland@redhat.com>
AuthorDate: Tue Aug 30 14:40:48 2022 -0500
Committer: David Teigland <teigland@redhat.com>
CommitterDate: Wed Nov 2 13:24:18 2022 -0500
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.");
^ permalink raw reply related [flat|nested] 2+ messages in thread* rhel-8.8.0 - vgimportdevices: fix locking when creating devices file
@ 2022-12-08 11:37 Marian Csontos
0 siblings, 0 replies; 2+ messages in thread
From: Marian Csontos @ 2022-12-08 11:37 UTC (permalink / raw)
To: lvm-devel
Gitweb: https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=0b9d9963b8f15a6f12a0149a62809fa9b846c5c5
Commit: 0b9d9963b8f15a6f12a0149a62809fa9b846c5c5
Parent: f1d8c01dff3f8839355004e5fd77e9cd521e26cb
Author: David Teigland <teigland@redhat.com>
AuthorDate: Tue Aug 30 14:40:48 2022 -0500
Committer: Marian Csontos <mcsontos@redhat.com>
CommitterDate: Mon Nov 28 17:11:21 2022 +0100
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.");
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-12-08 11:37 UTC | newest]
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