On Tue, May 09 2017 at 3:10pm -0400, Andy Grover <agrover@xxxxxxxxxx> wrote: > Hi Mike, > > We've been working off-list to develop a method of getting DM events > that is reliable, and also can monitor events from multiple DM devices > from a single thread. > > In short, these enable an open file descriptor to /dev/mapper/control > to be polled. If the fd indicates POLLIN, some DM device has > experienced an event. Figuring out which is made easier by adding > event_nr in a backwards-compatible way to DM_LIST_DEVICES, so > userspace can compare against previously seen per-device > event_nrs. A new ioctl is also added, to rearm the fd so it may be > re-poll()ed. See individual patch commitlogs for more details. > > Thanks to Mikulas for redeveloping earlier versions into this patchset, > as well as the other RH LVM devs who provided early internal feedback! I've picked this patchset up for 4.13 but this branch will likely see quite a few more rebases until 4.12-rcX stabilizes: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=for-4.13/dm I tweaked headers slightly and move the declaration of the variable used in the last commit to be outside the loop. Thought about splitting the additional 'struct file *filp' arg being sprinkled all over in the 2nd commit, into a separate earlier commit, but just left it as is in the end. Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
