Commit 7e4f9722 authored Nov 30, 2021 by Jaegeuk Kim

ANDROID: f2fs: check nr_pages for readahead



Old kernel versions have the issue, since upstream f2fs removed this flow by:
commit d4384de9eb5e ("f2fs: Remove readahead collision detection").

Bug: 206148707
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Fixes: 8c95605c41a1 ("f2fs: avoid readahead race condition")
Change-Id: I3a95f0b436d0a5ee420f41d892401a8d79d4fe79

parent f711e743

fs/f2fs/data.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2359,6 +2359,10 @@ int f2fs_mpage_readpages(struct address_space *mapping,
		unsigned max_nr_pages = nr_pages;
		int ret = 0;

		/* this is real from f2fs_merkle_tree_readahead() in old kernel only. */
		if (!nr_pages)
		return 0;

		map.m_pblk = 0;
		map.m_lblk = 0;
		map.m_len = 0;