4.20-stable review patch. If anyone has any objections, please let me know.
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From: Jaegeuk Kim jaegeuk@kernel.org
commit c6d6e9b0f6b4201c77f2cea3964dd122697e3543 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") 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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/dm-table.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm */ 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)