From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
From: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
commit a4c8dd9c2d0987cf542a2a0c42684c9c6d78a04e upstream.
According to the definition of dm_iterate_devices_fn:
* This function must iterate through each section of device used by the
* target until it encounters a non-zero return code, which it then returns.
* Returns zero if no callout returned non-zero.
For some target type (e.g. dm-stripe), one call of iterate_devices() may
iterate multiple underlying devices internally, in which case a non-zero
return code returned by iterate_devices_callout_fn will stop the iteration
in advance. No iterate_devices_callout_fn should return non-zero unless
device iteration should stop.
Rename dm_table_requires_stable_pages() to dm_table_any_dev_attr() and
elevate it for reuse to stop iterating (and return non-zero) on the
first device that causes iterate_devices_callout_fn to return non-zero.
Use dm_table_any_dev_attr() to properly iterate through devices.
Rename device_is_nonrot() to device_is_rotational() and invert logic
accordingly to fix improper disposition.
[jeffle: backport notes]
No stable writes. Also convert the no_sg_merge capability check,
which is introduced by commit 200612ec33e5 ("dm table: propagate
QUEUE_FLAG_NO_SG_MERGE"), and removed since commit 2705c93742e9 ("block:
kill QUEUE_FLAG_NO_SG_MERGE") in v5.1.
Fixes: c3c4555edd10 ("dm table: clear add_random unless all devices have it set")
Fixes: 4693c9668fdc ("dm table: propagate non rotational flag")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-table.c | 83 +++++++++++++++++++++++++++++++-------------------
1 file changed, 53 insertions(+), 30 deletions(-)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1210,6 +1210,46 @@ struct dm_target *dm_table_find_target(s
return &t->targets[(KEYS_PER_NODE * n) + k];
}
+/*
+ * type->iterate_devices() should be called when the sanity check needs to
+ * iterate and check all underlying data devices. iterate_devices() will
+ * iterate all underlying data devices until it encounters a non-zero return
+ * code, returned by whether the input iterate_devices_callout_fn, or
+ * iterate_devices() itself internally.
+ *
+ * For some target type (e.g. dm-stripe), one call of iterate_devices() may
+ * iterate multiple underlying devices internally, in which case a non-zero
+ * return code returned by iterate_devices_callout_fn will stop the iteration
+ * in advance.
+ *
+ * Cases requiring _any_ underlying device supporting some kind of attribute,
+ * should use the iteration structure like dm_table_any_dev_attr(), or call
+ * it directly. @func should handle semantics of positive examples, e.g.
+ * capable of something.
+ *
+ * Cases requiring _all_ underlying devices supporting some kind of attribute,
+ * 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);
+ */
+static bool dm_table_any_dev_attr(struct dm_table *t,
+ iterate_devices_callout_fn func)
+{
+ struct dm_target *ti;
+ unsigned int 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, func, NULL))
+ return true;
+ }
+
+ return false;
+}
+
static int count_device(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
@@ -1380,12 +1420,12 @@ static bool dm_table_discard_zeroes_data
return true;
}
-static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
+static int device_is_rotational(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);
- return q && blk_queue_nonrot(q);
+ return q && !blk_queue_nonrot(q);
}
static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
@@ -1396,29 +1436,12 @@ static int device_is_not_random(struct d
return q && !blk_queue_add_random(q);
}
-static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
+static int queue_no_sg_merge(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);
- return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags);
-}
-
-static bool dm_table_all_devices_attribute(struct dm_table *t,
- iterate_devices_callout_fn func)
-{
- struct dm_target *ti;
- unsigned i = 0;
-
- while (i < dm_table_get_num_targets(t)) {
- ti = dm_table_get_target(t, i++);
-
- if (!ti->type->iterate_devices ||
- !ti->type->iterate_devices(ti, func, NULL))
- return false;
- }
-
- return true;
+ return q && test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags);
}
static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev,
@@ -1511,18 +1534,18 @@ void dm_table_set_restrictions(struct dm
q->limits.discard_zeroes_data = 0;
/* Ensure that all underlying devices are non-rotational. */
- if (dm_table_all_devices_attribute(t, device_is_nonrot))
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
- else
+ if (dm_table_any_dev_attr(t, device_is_rotational))
queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
+ else
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
if (!dm_table_supports_write_same(t))
q->limits.max_write_same_sectors = 0;
- if (dm_table_all_devices_attribute(t, queue_supports_sg_merge))
- queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
- else
+ if (dm_table_any_dev_attr(t, queue_no_sg_merge))
queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
+ else
+ queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
dm_table_verify_integrity(t);
@@ -1532,7 +1555,7 @@ 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_all_devices_attribute(t, device_is_not_random))
+ if (blk_queue_add_random(q) && dm_table_any_dev_attr(t, device_is_not_random))
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
/*
