Commit cdf6cdcd authored by Vivek Goyal's avatar Vivek Goyal Committed by Dan Williams
Browse files

dm,dax: Add dax zero_page_range operation



This patch adds support for dax zero_page_range operation to dm targets.
Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Acked-by: default avatarMike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20200228163456.1587-5-vgoyal@redhat.com

Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 79fa974f
......@@ -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)
......
......@@ -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)
......
......@@ -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)
......
......@@ -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,
};
/*
......
......@@ -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;
......
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