[ Add Mike ] On Fri, Feb 28, 2020 at 8:35 AM Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > > This patch adds support for dax zero_page_range operation to dm targets. Mike, Sorry, I should have pinged you earlier, but could you take a look at this patch and ack it if it looks ok to go through the nvdimm tree with the rest of the series? > > Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx> > --- > drivers/md/dm-linear.c | 18 ++++++++++++++++++ > drivers/md/dm-log-writes.c | 17 +++++++++++++++++ > drivers/md/dm-stripe.c | 23 +++++++++++++++++++++++ > drivers/md/dm.c | 30 ++++++++++++++++++++++++++++++ > include/linux/device-mapper.h | 3 +++ > 5 files changed, 91 insertions(+) > > diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c > index 8d07fdf63a47..e1db43446327 100644 > --- a/drivers/md/dm-linear.c > +++ b/drivers/md/dm-linear.c > @@ -201,10 +201,27 @@ static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, > return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); > } > > +static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, > + size_t nr_pages) > +{ > + int ret; > + struct linear_c *lc = ti->private; > + struct block_device *bdev = lc->dev->bdev; > + struct dax_device *dax_dev = lc->dev->dax_dev; > + sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + > + dev_sector = linear_map_sector(ti, sector); > + ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff); > + if (ret) > + return ret; > + return dax_zero_page_range(dax_dev, pgoff, nr_pages); > +} > + > #else > #define linear_dax_direct_access NULL > #define linear_dax_copy_from_iter NULL > #define linear_dax_copy_to_iter NULL > +#define linear_dax_zero_page_range NULL > #endif > > static struct target_type linear_target = { > @@ -226,6 +243,7 @@ static struct target_type linear_target = { > .direct_access = linear_dax_direct_access, > .dax_copy_from_iter = linear_dax_copy_from_iter, > .dax_copy_to_iter = linear_dax_copy_to_iter, > + .dax_zero_page_range = linear_dax_zero_page_range, > }; > > int __init dm_linear_init(void) > diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c > index 99721c76225d..8ea20b56b4d6 100644 > --- a/drivers/md/dm-log-writes.c > +++ b/drivers/md/dm-log-writes.c > @@ -994,10 +994,26 @@ static size_t log_writes_dax_copy_to_iter(struct dm_target *ti, > return dax_copy_to_iter(lc->dev->dax_dev, pgoff, addr, bytes, i); > } > > +static int log_writes_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, > + size_t nr_pages) > +{ > + int ret; > + struct log_writes_c *lc = ti->private; > + sector_t sector = pgoff * PAGE_SECTORS; > + > + ret = bdev_dax_pgoff(lc->dev->bdev, sector, nr_pages << PAGE_SHIFT, > + &pgoff); > + if (ret) > + return ret; > + return dax_zero_page_range(lc->dev->dax_dev, pgoff, > + nr_pages << PAGE_SHIFT); > +} > + > #else > #define log_writes_dax_direct_access NULL > #define log_writes_dax_copy_from_iter NULL > #define log_writes_dax_copy_to_iter NULL > +#define log_writes_dax_zero_page_range NULL > #endif > > static struct target_type log_writes_target = { > @@ -1016,6 +1032,7 @@ static struct target_type log_writes_target = { > .direct_access = log_writes_dax_direct_access, > .dax_copy_from_iter = log_writes_dax_copy_from_iter, > .dax_copy_to_iter = log_writes_dax_copy_to_iter, > + .dax_zero_page_range = log_writes_dax_zero_page_range, > }; > > static int __init dm_log_writes_init(void) > diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c > index 63bbcc20f49a..fa813c0f993d 100644 > --- a/drivers/md/dm-stripe.c > +++ b/drivers/md/dm-stripe.c > @@ -360,10 +360,32 @@ static size_t stripe_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, > return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); > } > > +static int stripe_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, > + size_t nr_pages) > +{ > + int ret; > + sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + struct stripe_c *sc = ti->private; > + struct dax_device *dax_dev; > + struct block_device *bdev; > + uint32_t stripe; > + > + stripe_map_sector(sc, sector, &stripe, &dev_sector); > + dev_sector += sc->stripe[stripe].physical_start; > + dax_dev = sc->stripe[stripe].dev->dax_dev; > + bdev = sc->stripe[stripe].dev->bdev; > + > + ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff); > + if (ret) > + return ret; > + return dax_zero_page_range(dax_dev, pgoff, nr_pages); > +} > + > #else > #define stripe_dax_direct_access NULL > #define stripe_dax_copy_from_iter NULL > #define stripe_dax_copy_to_iter NULL > +#define stripe_dax_zero_page_range NULL > #endif > > /* > @@ -486,6 +508,7 @@ static struct target_type stripe_target = { > .direct_access = stripe_dax_direct_access, > .dax_copy_from_iter = stripe_dax_copy_from_iter, > .dax_copy_to_iter = stripe_dax_copy_to_iter, > + .dax_zero_page_range = stripe_dax_zero_page_range, > }; > > int __init dm_stripe_init(void) > diff --git a/drivers/md/dm.c b/drivers/md/dm.c > index b89f07ee2eff..aa72d9e757c1 100644 > --- a/drivers/md/dm.c > +++ b/drivers/md/dm.c > @@ -1198,6 +1198,35 @@ static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, > return ret; > } > > +static int dm_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, > + size_t nr_pages) > +{ > + struct mapped_device *md = dax_get_private(dax_dev); > + sector_t sector = pgoff * PAGE_SECTORS; > + struct dm_target *ti; > + int ret = -EIO; > + int srcu_idx; > + > + ti = dm_dax_get_live_target(md, sector, &srcu_idx); > + > + if (!ti) > + goto out; > + if (WARN_ON(!ti->type->dax_zero_page_range)) { > + /* > + * ->zero_page_range() is mandatory dax operation. If we are > + * here, something is wrong. > + */ > + dm_put_live_table(md, srcu_idx); > + goto out; > + } > + ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages); > + > + out: > + dm_put_live_table(md, srcu_idx); > + > + return ret; > +} > + > /* > * A target may call dm_accept_partial_bio only from the map routine. It is > * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET, > @@ -3199,6 +3228,7 @@ static const struct dax_operations dm_dax_ops = { > .dax_supported = dm_dax_supported, > .copy_from_iter = dm_dax_copy_from_iter, > .copy_to_iter = dm_dax_copy_to_iter, > + .zero_page_range = dm_dax_zero_page_range, > }; > > /* > diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h > index 475668c69dbc..af48d9da3916 100644 > --- a/include/linux/device-mapper.h > +++ b/include/linux/device-mapper.h > @@ -141,6 +141,8 @@ typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff, > long nr_pages, void **kaddr, pfn_t *pfn); > typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff, > void *addr, size_t bytes, struct iov_iter *i); > +typedef int (*dm_dax_zero_page_range_fn)(struct dm_target *ti, pgoff_t pgoff, > + size_t nr_pages); > #define PAGE_SECTORS (PAGE_SIZE / 512) > > void dm_error(const char *message); > @@ -195,6 +197,7 @@ struct target_type { > dm_dax_direct_access_fn direct_access; > dm_dax_copy_iter_fn dax_copy_from_iter; > dm_dax_copy_iter_fn dax_copy_to_iter; > + dm_dax_zero_page_range_fn dax_zero_page_range; > > /* For internal device-mapper use. */ > struct list_head list; > -- > 2.20.1 >