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From 9d17a215fb30cb3e49db516a39c9bec2159004a7 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Thu, 24 Jul 2014 23:37:35 +0200
Subject: [PATCH 3/3] udev: exclude MD from block device ownership event
locking
MD instantiates devices at open(). This is incomptible with the
locking logic, as the "change" event emitted when stopping a
device will bring it back.
---
src/udev/udevd.c | 23 +++++++----------------
1 file changed, 7 insertions(+), 16 deletions(-)
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index a45d324..db935d6 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -285,26 +285,17 @@ static void worker_new(struct event *event)
udev_event->exec_delay = exec_delay;
/*
- * Take a "read lock" on the device node; this establishes
+ * Take a shared lock on the device node; this establishes
* a concept of device "ownership" to serialize device
- * access. External processes holding a "write lock" will
+ * access. External processes holding an exclusive lock will
* cause udev to skip the event handling; in the case udev
- * acquired the lock, the external process will block until
+ * acquired the lock, the external process can block until
* udev has finished its event handling.
*/
-
- /*
- * <kabi_> since we make check - device seems unused - we try
- * ioctl to deactivate - and device is found to be opened
- * <kay> sure, you try to take a write lock
- * <kay> if you get it udev is out
- * <kay> if you can't get it, udev is busy
- * <kabi_> we cannot deactivate openned device (as it is in-use)
- * <kay> maybe we should just exclude dm from that thing entirely
- * <kabi_> IMHO this sounds like a good plan for this moment
- */
- if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
- !startswith(udev_device_get_sysname(dev), "dm-")) {
+ if (!streq_ptr(udev_device_get_action(dev), "remove") &&
+ streq_ptr("block", udev_device_get_subsystem(dev)) &&
+ !startswith(udev_device_get_sysname(dev), "dm-") &&
+ !startswith(udev_device_get_sysname(dev), "md")) {
struct udev_device *d = dev;
if (streq_ptr("partition", udev_device_get_devtype(d)))
--
1.8.5.5
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