Commit 6d4e01bf authored Jul 06, 2017 by Jaegeuk Kim Committed by Jaegeuk Kim Jul 31, 2017

f2fs: relax migratepage for atomic written page



commit ff1048e7dffe0582a50e2eaf90e13fc76ea8493d upstream.

In order to avoid lock contention for atomic written pages, we'd better give
EBUSY in f2fs_migrate_page when mode is asynchronous. We expect it will be
released soon as transaction commits.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 93942ea2

fs/f2fs/data.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -2232,8 +2232,12 @@ int f2fs_migrate_page(struct address_space *mapping,
		BUG_ON(PageWriteback(page));

		/* migrating an atomic written page is safe with the inmem_lock hold */
		if (atomic_written && !mutex_trylock(&fi->inmem_lock))
		if (atomic_written) {
		if (mode != MIGRATE_SYNC)
		return -EBUSY;
		if (!mutex_trylock(&fi->inmem_lock))
		return -EAGAIN;
		}

		/*
		* A reference is expected if PagePrivate set when move mapping,