Commit 2d9b5dcd authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman
Browse files

staging: erofs: decompress asynchronously if PG_readahead page at first 



For the case of nr_to_read == lookahead_size, it is better to
decompress asynchronously as well since no page will be needed immediately.

Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 23edf3ab

drivers/staging/erofs/unzip_vle.c

+8 −1
Original line number Diff line number Diff line
@@ -1345,8 +1345,8 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp, 
{

	struct inode *const inode = mapping->host;

	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);

	const bool sync = __should_decompress_synchronously(sbi, nr_pages);



	bool sync = __should_decompress_synchronously(sbi, nr_pages);

	struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode);

	gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);

	struct page *head = NULL;
@@ -1364,6 +1364,13 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp, 
		prefetchw(&page->flags);

		list_del(&page->lru);



		/*

		 * A pure asynchronous readahead is indicated if

		 * a PG_readahead marked page is hitted at first.

		 * Let's also do asynchronous decompression for this case.

		 */

		sync &= !(PageReadahead(page) && !head);



		if (add_to_page_cache_lru(page, mapping, page->index, gfp)) {

			list_add(&page->lru, &pagepool);

			continue;

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