Commit 927b6b2d authored Dec 11, 2018 by Shin'ichiro Kawasaki Committed by Jens Axboe Dec 11, 2018

block: Fix null_blk_zoned creation failure with small number of zones

null_blk_zoned creation fails if the number of zones specified is equal to or is
smaller than 64 due to a memory allocation failure in blk_alloc_zones(). With
such a small number of zones, the required memory size for all zones descriptors
fits in a single page, and the page order for alloc_pages_node() is zero. Allow
this value in blk_alloc_zones() for the allocation to succeed.

Fixes: bf505456 "block: Introduce blk_revalidate_disk_zones()"
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent a538e3ff

block/blk-zoned.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -378,7 +378,7 @@ static struct blk_zone blk_alloc_zones(int node, unsigned int nr_zones)
		struct page *page;
		int order;

		for (order = get_order(size); order > 0; order--) {
		for (order = get_order(size); order >= 0; order--) {
		page = alloc_pages_node(node, GFP_NOIO \| __GFP_ZERO, order);
		if (page) {
		nr_zones = min_t(unsigned int, nr_zones,

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