On Wed, May 23, 2018 at 01:35:59PM -0400, Josef Bacik wrote: > From: Josef Bacik <[email protected]> > > For some reason we had discard granularity set to 512 always even when > discards were disabled. Fix this by having the default be 0, and then > if we turn it on set the discard granularity to the blocksize. > > Signed-off-by: Josef Bacik <[email protected]> > Reviewed-by: Martin K. Petersen <[email protected]> > --- > drivers/block/nbd.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c > index 1147e4680c80..bdfbb2a7018c 100644 > --- a/drivers/block/nbd.c > +++ b/drivers/block/nbd.c > @@ -236,6 +236,10 @@ static void nbd_size_update(struct nbd_device *nbd) > struct nbd_config *config = nbd->config; > struct block_device *bdev = bdget_disk(nbd->disk, 0); > > + if (config->flags & NBD_FLAG_SEND_TRIM) { > + nbd->disk->queue->limits.discard_granularity = config->blksize; > + blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX); > + } > blk_queue_logical_block_size(nbd->disk->queue, config->blksize); > blk_queue_physical_block_size(nbd->disk->queue, config->blksize); > set_capacity(nbd->disk, config->bytesize >> 9); > @@ -1050,6 +1054,8 @@ static void nbd_config_put(struct nbd_device *nbd) > nbd->config = NULL; > > nbd->tag_set.timeout = 0; > + nbd->disk->queue->limits.discard_granularity = 0; > + blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX); > blk_queue_flag_clear(QUEUE_FLAG_DISCARD, nbd->disk->queue); > > mutex_unlock(&nbd->config_lock); > @@ -1502,8 +1508,8 @@ static int nbd_dev_add(int index) > */ > blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue); > blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, disk->queue); > - disk->queue->limits.discard_granularity = 512; > - blk_queue_max_discard_sectors(disk->queue, UINT_MAX); > + disk->queue->limits.discard_granularity = 0; > + blk_queue_max_discard_sectors(disk->queue, 0); > blk_queue_max_segment_size(disk->queue, UINT_MAX); > blk_queue_max_segments(disk->queue, USHRT_MAX); > blk_queue_max_hw_sectors(disk->queue, 65536);
Could you add a blktest for this? (And also respond to the comment on https://github.com/osandov/blktests/pull/18). Thanks!
