diff options
Diffstat (limited to 'drivers/md/dm-table.c')
| -rw-r--r-- | drivers/md/dm-table.c | 43 |
1 files changed, 22 insertions, 21 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 433bd3f3014c..88130b5d95f9 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1758,13 +1758,12 @@ static bool dm_table_supports_write_zeroes(struct dm_table *t) return true; } - -static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, - sector_t start, sector_t len, void *data) +static int device_not_discard_capable(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_discard(q); + return q && !blk_queue_discard(q); } static bool dm_table_supports_discards(struct dm_table *t) @@ -1772,28 +1771,24 @@ static bool dm_table_supports_discards(struct dm_table *t) struct dm_target *ti; unsigned i; - /* - * Unless any target used by the table set discards_supported, - * require at least one underlying device to support discards. - * t->devices includes internal dm devices such as mirror logs - * so we need to use iterate_devices here, which targets - * supporting discard selectively must provide. - */ for (i = 0; i < dm_table_get_num_targets(t); i++) { ti = dm_table_get_target(t, i); if (!ti->num_discard_bios) - continue; - - if (ti->discards_supported) - return true; + return false; - if (ti->type->iterate_devices && - ti->type->iterate_devices(ti, device_discard_capable, NULL)) - return true; + /* + * Either the target provides discard support (as implied by setting + * 'discards_supported') or it relies on _all_ data devices having + * discard support. + */ + if (!ti->discards_supported && + (!ti->type->iterate_devices || + ti->type->iterate_devices(ti, device_not_discard_capable, NULL))) + return false; } - return false; + return true; } void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, @@ -1806,9 +1801,15 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, */ q->limits = *limits; - if (!dm_table_supports_discards(t)) + if (!dm_table_supports_discards(t)) { queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); - else + /* Must also clear discard limits... */ + q->limits.max_discard_sectors = 0; + q->limits.max_hw_discard_sectors = 0; + q->limits.discard_granularity = 0; + q->limits.discard_alignment = 0; + q->limits.discard_misaligned = 0; + } else queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) { |