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3bf2bd2073
Add configfs interface for nullb. configfs interface is more flexible and easy to configure in a per-disk basis. Configuration is something like this: mount -t configfs none /mnt Checking which features the driver supports: cat /mnt/nullb/features The 'features' attribute is for future extension. We probably will add new features into the driver, userspace can check this attribute to find the supported features. Create/remove a device: mkdir/rmdir /mnt/nullb/a Then configure the device by setting attributes under /mnt/nullb/a, most of nullb supported module parameters are converted to attributes: size; /* device size in MB */ completion_nsec; /* time in ns to complete a request */ submit_queues; /* number of submission queues */ home_node; /* home node for the device */ queue_mode; /* block interface */ blocksize; /* block size */ irqmode; /* IRQ completion handler */ hw_queue_depth; /* queue depth */ use_lightnvm; /* register as a LightNVM device */ blocking; /* blocking blk-mq device */ use_per_node_hctx; /* use per-node allocation for hardware context */ Note, creating a device doesn't create a disk immediately. Creating a disk is done in two phases: create a device and then power on the device. Next patch will introduce device power on. Based on original patch from Kyungchan Koh Signed-off-by: Kyungchan Koh <kkc6196@fb.com> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.