Commit 015a739c authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Handle writeback under high memory pressure better 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent eef1c494

fs/btrfs/extent-tree.c

+1 −1
Original line number Diff line number Diff line
@@ -961,7 +961,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root 


	level = btrfs_header_level(root->node);



	if (num_bytes >= 96 * 1024 * 1024 && hint_byte) {

	if (num_bytes >= 32 * 1024 * 1024 && hint_byte) {

		data = BTRFS_BLOCK_GROUP_MIXED;

	}

fs/btrfs/extent_map.c

+12 −0
Original line number Diff line number Diff line
@@ -1861,13 +1861,25 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page, 
			  struct writeback_control *wbc)

{

	int ret;

	struct address_space *mapping = page->mapping;

	struct extent_page_data epd = {

		.bio = NULL,

		.tree = tree,

		.get_extent = get_extent,

	};

	struct writeback_control wbc_writepages = {

		.bdi		= wbc->bdi,

		.sync_mode	= WB_SYNC_NONE,

		.older_than_this = NULL,

		.nr_to_write	= 64,

		.range_start	= page_offset(page) + PAGE_CACHE_SIZE,

		.range_end	= (loff_t)-1,

	};





	ret = __extent_writepage(page, wbc, &epd);



	write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd);

	if (epd.bio)

		submit_one_bio(WRITE, epd.bio);

	return ret;