7e50402aa3
Previously, inotify watch on a device node was added/removed by a worker process processing the relevant uevent. However, that could not avoid races. For example, 1. A device node X is removed by the kernel (e.g. unplug USB memory), and the kernel removes the inotify watch for the device node and produces IN_IGNORED event and 'remove' uevent for the device. 2. Before udevd processes the 'remove' uevent of the device, a worker process may try to add an inotify watch on another device node Y. As the inotify watch on X has been already removed, the worker may acquire the same watch handle that was previously assigned to X. 3. Since the 'remove' uevent for X is not processed yet, the symlink named with the watch handle still exists and points to X. So, the worker process for Y cannot add the symlink... To avoid such races, let's sequentially add/remove inotify watch by the manager process. Note, this potentially reduces performance on boot when there exists huge amount of disks and/or partitions.
System and Service Manager
Details
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