On Fri, Apr 23, 2021 at 09:32:38AM +0800, JeffleXu wrote: > > > On 4/22/21 8:20 PM, Ming Lei wrote: > > From: Jeffle Xu <[email protected]> > > > > IO polling is enabled when all underlying target devices are capable > > of IO polling. The sanity check supports the stacked device model, in > > which one dm device may be build upon another dm device. In this case, > > the mapped device will check if the underlying dm target device > > supports IO polling. > > > > Reviewed-by: Hannes Reinecke <[email protected]> > > Reviewed-by: Mike Snitzer <[email protected]> > > Signed-off-by: Jeffle Xu <[email protected]> > > Signed-off-by: Ming Lei <[email protected]> > > --- > > drivers/md/dm-table.c | 24 ++++++++++++++++++++++++ > > drivers/md/dm.c | 2 ++ > > include/linux/device-mapper.h | 1 + > > 3 files changed, 27 insertions(+) > > > > diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c > > index 95391f78b8d5..a8f3575fb118 100644 > > --- a/drivers/md/dm-table.c > > +++ b/drivers/md/dm-table.c > > @@ -1509,6 +1509,12 @@ struct dm_target *dm_table_find_target(struct > > dm_table *t, sector_t sector) > > return &t->targets[(KEYS_PER_NODE * n) + k]; > > } > > > > +static int device_not_poll_capable(struct dm_target *ti, struct dm_dev > > *dev, > > + sector_t start, sector_t len, void *data) > > +{ > > + return !blk_queue_poll(bdev_get_queue(dev->bdev)); > > +} > > + > > /* > > * type->iterate_devices() should be called when the sanity check needs to > > * iterate and check all underlying data devices. iterate_devices() will > > @@ -1559,6 +1565,11 @@ static int count_device(struct dm_target *ti, struct > > dm_dev *dev, > > return 0; > > } > > > > +int dm_table_supports_poll(struct dm_table *t) > > +{ > > + return !dm_table_any_dev_attr(t, device_not_poll_capable, NULL); > > +} > > + > > Since .poll_capable() has been dropped, dm_table_supports_poll() can be > declared as 'static' here. > > > /* > > * Check whether a table has no data devices attached using each > > * target's iterate_devices method. > > @@ -2079,6 +2090,19 @@ void dm_table_set_restrictions(struct dm_table *t, > > struct request_queue *q, > > > > dm_update_keyslot_manager(q, t); > > blk_queue_update_readahead(q); > > + > > + /* > > + * Check for request-based device is remained to > > + * dm_mq_init_request_queue()->blk_mq_init_allocated_queue(). > > + * For bio-based device, only set QUEUE_FLAG_POLL when all underlying > > + * devices supporting polling. > > + */ > > + if (__table_type_bio_based(t->type)) { > > + if (dm_table_supports_poll(t)) > > + blk_queue_flag_set(QUEUE_FLAG_POLL, q); > > + else > > + blk_queue_flag_clear(QUEUE_FLAG_POLL, q); > > + } > > } > > > > unsigned int dm_table_get_num_targets(struct dm_table *t) > > diff --git a/drivers/md/dm.c b/drivers/md/dm.c > > index 50b693d776d6..1b160e4e6446 100644 > > --- a/drivers/md/dm.c > > +++ b/drivers/md/dm.c > > @@ -2175,6 +2175,8 @@ int dm_setup_md_queue(struct mapped_device *md, > > struct dm_table *t) > > } > > break; > > case DM_TYPE_BIO_BASED: > > + /* tell block layer we are capable of bio polling */ > > + md->disk->flags |= GENHD_FL_CAP_BIO_POLL; > > case DM_TYPE_DAX_BIO_BASED: > > break; > > case DM_TYPE_NONE: > > > > diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h > > index 7f4ac87c0b32..31bfd6f70013 100644 > > --- a/include/linux/device-mapper.h > > +++ b/include/linux/device-mapper.h > > @@ -538,6 +538,7 @@ unsigned int dm_table_get_num_targets(struct dm_table > > *t); > > fmode_t dm_table_get_mode(struct dm_table *t); > > struct mapped_device *dm_table_get_md(struct dm_table *t); > > const char *dm_table_device_name(struct dm_table *t); > > +int dm_table_supports_poll(struct dm_table *t); > > Similarly, dm_table_supports_poll() doesn't need to be exported.
Yeah, has fixed it in V7. Thanks, Ming -- dm-devel mailing list [email protected] https://listman.redhat.com/mailman/listinfo/dm-devel
