Commit de1b0ee4 authored Aug 31, 2020 by Jens Axboe

block: ensure bdi->io_pages is always initialized



If a driver leaves the limit settings as the defaults, then we don't
initialize bdi->io_pages. This means that file systems may need to
work around bdi->io_pages == 0, which is somewhat messy.

Initialize the default value just like we do for ->ra_pages.

Cc: stable@vger.kernel.org
Fixes: 9491ae4a ("mm: don't cap request size based on read-ahead setting")
Reported-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 5d220bcd

block/blk-core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -539,6 +539,7 @@ struct request_queue *blk_alloc_queue(int node_id)
		goto fail_stats;

		q->backing_dev_info->ra_pages = VM_READAHEAD_PAGES;
		q->backing_dev_info->io_pages = VM_READAHEAD_PAGES;
		q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK;
		q->node = node_id;

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