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rbd: set the remaining discard properties to enable support 

max_discard_sectors must be set for the queue to support discard.
Operations implementing discard for rbd zero data, so report that.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Josh Durgin 2014-04-07 16:52:03 -07:00 committed by Ilya Dryomov
parent d3246fb0da
commit b76f82398c
1 changed files with 2 additions and 0 deletions
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2
drivers/block/rbd.c
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@ -3764,6 +3764,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
q->limits.discard_granularity = segment_size;
q->limits.discard_alignment = segment_size;
q->limits.max_discard_sectors = segment_size / SECTOR_SIZE;
q->limits.discard_zeroes_data = 1;
blk_queue_merge_bvec(q, rbd_merge_bvec);
disk->queue = q;