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AIX kernel facility to track outstanding opens to a device
Currently AIX doesn't track open()s to a device. In case a process has a device opened before the configuration method has ran that device cannot be configured on the OS without a reboot, because it is not possible to identify the offending process.
I'd like to suggest that a facility be introduced to track outstanding open()s to a device - that would allow to identify the offending process and kill it to allow device configuration.
This is a global issue, that has been seen by support in countless scenarios where a process on the host might open() a device before the driver (EMC PowerPath, MF Data Protector, etc...). Keeping the logging to only outstanding open()s should allow to keep the overhead tolerable as logging any open() would be quite a lot of workload.
For example scsidiskdd could track processes with an outstanding open() and store their PID in the disk major structure. That information could be retrieved by either "kdb -> scsidisk <address> or via a userspace tool for that.
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