On Fri, Feb 13 2015 at 1:48pm -0500, heinzm@xxxxxxxxxx <heinzm@xxxxxxxxxx> wrote: > From: Heinz Mauelshagen <heinzm@xxxxxxxxxx> > > I'm enhancing the device mapper raid target (dm-raid) to take > advantage of so far unused md raid kernel funtionality: > takeover, reshape, resize, addition and removal of devices to/from raid sets. > > This series of patches remove constraints doing so. > > > Patch #1: > add 2 API functions to allow dm-raid to access the raid takeover > and resize functionality (namely md_takeover() and md_resize()); > reshape APIs are not needed in lieu of the existing personalilty ones > > Patch #2: > because device mapper core manages a request queue per mapped device > utilizing the md make_request API to pass on bios via the dm-raid target, > no md instance underneath it needs to manage a request queue of its own. > Thus dm-raid can't use the md raid0 personality as is, because the latter > accesses the request queue unconditionally in 3 places via mddev->queue > which this patch addresses. > > Patch #3: > when dm-raid processes a down takeover to raid0, it needs to destroy > any existing bitmap, because raid0 does not require one. The patch > exports the bitmap_destroy() API to allow dm-raid to remove bitmaps. Shouldn't you have cc'd the linux-raid mailing list and Neil Brown? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
