Hi all, This patchset allows events for multiple DM devices to be monitored by a single thread, instead of requiring one thread per device. This is made possible by a new ioctl to create an association between an open file descriptor to /dev/mapper/control and a DM device. A program can open and associate multiple times, and then poll() all the fds. Since we now track something per-fd - the association - our new ioctl handler needs the struct file*. lookup_ioctl() requires all ioctl handlers have the same arguments, so patch 1 changes all ioctl_fns to add this. Patch 2 implements support, but limits associated fds to just being used with poll(), and the VERSION ioctl. Patch 3 (optional) shows how we could use the associated device to do additional ioctls without needing to specify the device in the ioctl(). There's also a simple test program at: https://github.com/agrover/dm-poll-test Thanks -- Andy Andy Grover (3): dm: Change ioctl handlers to take struct file* dm: Add support to poll for dm events dm: Allow associated fd to be used for TABLE_STATUS drivers/md/dm-core.h | 10 +++ drivers/md/dm-ioctl.c | 149 +++++++++++++++++++++++++++++++++++------- drivers/md/dm.c | 12 ++++ include/uapi/linux/dm-ioctl.h | 6 +- 4 files changed, 151 insertions(+), 26 deletions(-) -- 2.9.3 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
