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Add the ability to poll on the /dev/mapper/control device. The select or poll function waits until any event happens on any dm device since opening the /dev/mapper/control device. When select or poll returns the device as readable, we must close and reopen the device to wait for new dm events. Usage: 1. open the /dev/mapper/control device 2. scan the event numbers of all devices we are interested in and process them 3. call select, poll or epoll on the handle (it waits until some new event happens since opening the device) 4. close the /dev/mapper/control handle 5. go to step 1 The next commit allows to re-arm the polling without closing and reopening the device. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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.