Commit 0a2fff24 authored by Jaegeuk Kim's avatar Jaegeuk Kim Committed by Greg Kroah-Hartman

dm: do not allow readahead to limit IO size

commit c6d6e9b0 upstream.

Update DM to set the bdi's io_pages.  This fixes reads to be capped at
the device's max request size (even if user's read IO exceeds the
established readahead setting).

Fixes: 9491ae4a ("mm: don't cap request size based on read-ahead setting")
Reviewed-by: default avatarJens Axboe <>
Signed-off-by: default avatarJaegeuk Kim <>
Signed-off-by: default avatarMike Snitzer <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent d902258a
......@@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
if (blk_queue_is_zoned(q))
/* Allow reads to exceed readahead limits */
q->backing_dev_info->io_pages = limits->max_sectors >> (PAGE_SHIFT - 9);
unsigned int dm_table_get_num_targets(struct dm_table *t)
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