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The device created in nullb configfs interface isn't power on by default. After user configures the device, user can do 'echo 1 > xxx/nullb/device_name/power' to power on the device, which will create a disk. the xxx/nullb/device_name/index is the disk index, so if the index is 2, the new created disk should be named as /dev/nullb2. Note, the 'index' is only valid after disk is power on. 'echo 0 > xxx/nullb/device_name/power' will remove the disk. Note, this doesn't remove the device. To remove the device, user should do 'rmdir xxx/nullb/device_name'. Removing the device will remove the disk too. Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.