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dm thin: update discard_granularity to reflect the thin-pool blocksize
commit 09869de57ed2728ae3c619803932a86cb0e2c4f8 upstream. DM thinp already checks whether the discard_granularity of the data device is a factor of the thin-pool block size. But when using the dm-thin-pool's discard passdown support, DM thinp was not selecting the max of the underlying data device's discard_granularity and the thin-pool's block size. Update set_discard_limits() to set discard_granularity to the max of these values. This enables blkdev_issue_discard() to properly align the discards that are sent to the DM thin device on a full block boundary. As such each discard will now cover an entire DM thin-pool block and the block will be reclaimed. Reported-by: Zdenek Kabelac <zkabelac@redhat.com> Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2647,7 +2647,8 @@ static void set_discard_limits(struct pool_c *pt, struct queue_limits *limits)
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*/
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if (pt->adjusted_pf.discard_passdown) {
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data_limits = &bdev_get_queue(pt->data_dev->bdev)->limits;
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limits->discard_granularity = data_limits->discard_granularity;
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limits->discard_granularity = max(data_limits->discard_granularity,
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pool->sectors_per_block << SECTOR_SHIFT);
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} else
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limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
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}
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