On Tue, Jan 21 2020 at 5:42am -0500, Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> wrote: > Since dm inherits limits from underlining block devices, > this patch directly disables max_allocate_sectors for dm > till full allocation support is implemented. > > This prevents high-level primitives (generic_make_request_checks(), > __blkdev_issue_write_zeroes(), ...) from sending REQ_ALLOCATE > requests. > > Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> > --- > drivers/md/dm-table.c | 2 ++ > drivers/md/md.h | 1 + > 2 files changed, 3 insertions(+) You're mixing DM and MD changes in the same patch. But I'm wondering if it might be best to set this default for stacking devices in blk_set_stacking_limits()? And then it is up to each stacking driver to override as needed. Mike
