Since dm inherits limits from underlining block devices, this patch directly disables max_allocate_sectors for dm till full allocation support is implemented. This prevents high-level primitives (generic_make_request_checks(), __blkdev_issue_write_zeroes(), ...) from sending REQ_ALLOCATE requests. Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> --- drivers/md/dm-table.c | 2 ++ drivers/md/md.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 0a2cc197f62b..e245c0d882aa 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -489,6 +489,7 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, (unsigned long long) start << SECTOR_SHIFT); limits->zoned = blk_queue_zoned_model(q); + blk_queue_max_allocate_sectors(q, 0); return 0; } @@ -1548,6 +1549,7 @@ int dm_calculate_queue_limits(struct dm_table *table, dm_device_name(table->md), (unsigned long long) ti->begin, (unsigned long long) ti->len); + limits->max_allocate_sectors = 0; /* * FIXME: this should likely be moved to blk_stack_limits(), would diff --git a/drivers/md/md.h b/drivers/md/md.h index acd681939112..d9088122674d 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -798,5 +798,6 @@ static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio if (bio_op(bio) == REQ_OP_WRITE_ZEROES && !bio->bi_disk->queue->limits.max_write_zeroes_sectors) mddev->queue->limits.max_write_zeroes_sectors = 0; + blk_queue_max_allocate_sectors(mddev->queue, 0); } #endif /* _MD_MD_H */
