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nvme: introduce generic per-namespace chardev
Userspace has not been allowed to I/O to device that's failed to be initialized. This patch introduces generic per-namespace character device to allow userspace to I/O regardless the block device is there or not. The chardev naming convention will similar to the existing blkdev naming, using a ng prefix instead of nvme, i.e. - /dev/ngXnY It also supports multipath which means it will not expose chardev for the hidden namespace blkdevs (e.g., nvmeXcYnZ). If /dev/ngXnY is created for a ns_head, then I/O request will be routed to a specific controller selected by the iopolicy of the subsystem. Signed-off-by: Minwoo Im <[email protected]> Signed-off-by: Javier González <[email protected]> Reviewed-by: Keith Busch <[email protected]> Tested-by: Kanchan Joshi <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]>
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