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dm: do not allow readahead to limit IO size 

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")
Cc: stable@vger.kernel.org
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Jaegeuk Kim 2018-12-18 09:25:37 -08:00 committed by Mike Snitzer
parent 74694bcbdf
commit c6d6e9b0f6
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-table.c
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@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
*/
if (blk_queue_is_zoned(q))
blk_revalidate_disk_zones(t->md->disk);
/* 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)