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null_blk: don't allow discard for zoned mode 

Zoned block device specification do not define the behavior of
discard/trim command as this command is generally replaced by the reset
write pointer (zone reset) command. Emulate this in null_blk by making
zoned and discard options mutually exclusive.

Suggested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chaitanya Kulkarni 2020-05-20 16:01:52 -07:00 committed by Jens Axboe
parent e274832590
commit 1592cd15ee
1 changed files with 7 additions and 0 deletions
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7
drivers/block/null_blk_main.c
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@ -1535,6 +1535,13 @@ static void null_config_discard(struct nullb *nullb)
{
if (nullb->dev->discard == false)
return;
if (nullb->dev->zoned) {
nullb->dev->discard = false;
pr_info("discard option is ignored in zoned mode\n");
return;
}
nullb->q->limits.discard_granularity = nullb->dev->blocksize;
nullb->q->limits.discard_alignment = nullb->dev->blocksize;
blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);