[PATCH 4.14 09/20] dm table: fix zoned iterate_devices based device capability checks

gregkh
2021-03-10T13:28:54Z

From: Jeffle Xu <jefflexu@linux.alibaba.com>

commit 24f6b6036c9eec21191646930ad42808e6180510 upstream.

Fix dm_table_supports_zoned_model() and invert logic of both
iterate_devices_callout_fn so that all devices' zoned capabilities are
properly checked.

Add one more parameter to dm_table_any_dev_attr(), which is actually
used as the @data parameter of iterate_devices_callout_fn, so that
dm_table_matches_zone_sectors() can be replaced by
dm_table_any_dev_attr().

Fixes: dd88d313bef02 ("dm table: add zoned block devices validation")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
[jeffle: also convert no_sg_merge check]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/md/dm-table.c | 50 +++++++++++++++++---------------------------------
1 file changed, 17 insertions(+), 33 deletions(-)

--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1372,10 +1372,10 @@ struct dm_target *dm_table_find_target(s
* should use the iteration structure like dm_table_supports_nowait() or
* dm_table_supports_discards(). Or introduce dm_table_all_devs_attr() that
* uses an @anti_func that handle semantics of counter examples, e.g. not
- * capable of something. So: return !dm_table_any_dev_attr(t, anti_func);
+ * capable of something. So: return !dm_table_any_dev_attr(t, anti_func, data);
*/
static bool dm_table_any_dev_attr(struct dm_table *t,
- iterate_devices_callout_fn func)
+ iterate_devices_callout_fn func, void *data)
{
struct dm_target *ti;
unsigned int i;
@@ -1384,7 +1384,7 @@ static bool dm_table_any_dev_attr(struct
ti = dm_table_get_target(t, i);

if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, func, NULL))
+ ti->type->iterate_devices(ti, func, data))
return true;
}

@@ -1427,13 +1427,13 @@ bool dm_table_has_no_data_devices(struct
return true;
}

-static int device_is_zoned_model(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
+static int device_not_zoned_model(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
enum blk_zoned_model *zoned_model = data;

- return q && blk_queue_zoned_model(q) == *zoned_model;
+ return !q || blk_queue_zoned_model(q) != *zoned_model;
}

static bool dm_table_supports_zoned_model(struct dm_table *t,
@@ -1450,37 +1450,20 @@ static bool dm_table_supports_zoned_mode
return false;

if (!ti->type->iterate_devices ||
- !ti->type->iterate_devices(ti, device_is_zoned_model, &zoned_model))
+ ti->type->iterate_devices(ti, device_not_zoned_model, &zoned_model))
return false;
}

return true;
}

-static int device_matches_zone_sectors(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
+static int device_not_matches_zone_sectors(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
unsigned int *zone_sectors = data;

- return q && blk_queue_zone_sectors(q) == *zone_sectors;
-}
-
-static bool dm_table_matches_zone_sectors(struct dm_table *t,
- unsigned int zone_sectors)
-{
- struct dm_target *ti;
- unsigned i;
-
- for (i = 0; i < dm_table_get_num_targets(t); i++) {
- ti = dm_table_get_target(t, i);
-
- if (!ti->type->iterate_devices ||
- !ti->type->iterate_devices(ti, device_matches_zone_sectors, &zone_sectors))
- return false;
- }
-
- return true;
+ return !q || blk_queue_zone_sectors(q) != *zone_sectors;
}

static int validate_hardware_zoned_model(struct dm_table *table,
@@ -1500,7 +1483,7 @@ static int validate_hardware_zoned_model
if (!zone_sectors || !is_power_of_2(zone_sectors))
return -EINVAL;

- if (!dm_table_matches_zone_sectors(table, zone_sectors)) {
+ if (dm_table_any_dev_attr(table, device_not_matches_zone_sectors, &zone_sectors)) {
DMERR("%s: zone sectors is not consistent across all devices",
dm_device_name(table->md));
return -EINVAL;
@@ -1837,11 +1820,11 @@ void dm_table_set_restrictions(struct dm
else
queue_flag_clear_unlocked(QUEUE_FLAG_DAX, q);

- if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled))
+ if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled, NULL))
dax_write_cache(t->md->dax_dev, true);

/* Ensure that all underlying devices are non-rotational. */
- if (dm_table_any_dev_attr(t, device_is_rotational))
+ if (dm_table_any_dev_attr(t, device_is_rotational, NULL))
queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
else
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
@@ -1851,7 +1834,7 @@ void dm_table_set_restrictions(struct dm
if (!dm_table_supports_write_zeroes(t))
q->limits.max_write_zeroes_sectors = 0;

- if (dm_table_any_dev_attr(t, queue_no_sg_merge))
+ if (dm_table_any_dev_attr(t, queue_no_sg_merge, NULL))
queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
else
queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
@@ -1865,7 +1848,7 @@ void dm_table_set_restrictions(struct dm
* them as well. Only targets that support iterate_devices are considered:
* don't want error, zero, etc to require stable pages.
*/
- if (dm_table_any_dev_attr(t, device_requires_stable_pages))
+ if (dm_table_any_dev_attr(t, device_requires_stable_pages, NULL))
q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
else
q->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES;
@@ -1876,7 +1859,8 @@ void dm_table_set_restrictions(struct dm
* Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
* have it set.
*/
- if (blk_queue_add_random(q) && dm_table_any_dev_attr(t, device_is_not_random))
+ if (blk_queue_add_random(q) &&
+ dm_table_any_dev_attr(t, device_is_not_random, NULL))
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);

/*