f2fs: warm up cold page after mmaped write

With cost-benifit method, background gc will consider old section with
fewer valid blocks as candidate victim, these old blocks in section will
be treated as cold data, and laterly will be moved into cold segment.

But if the gcing page is attached by user through buffered or mmaped
write, we should reset the page as non-cold one, because this page may
have more opportunity for further updating.

So fix to add clearing code for the missed 'mmap' case.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index dcc01137fca0f98e10200306c8ebca750a4ac4b0..9c40f8cfb77cfae8ccaa9053fa9c28645fa7a621 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -86,6 +86,8 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
 mapped:
        /* fill the page */
        f2fs_wait_on_page_writeback(page, DATA);
+       /* if gced page is attached, don't write to cold segment */
+       clear_cold_data(page);
 out:
        sb_end_pagefault(inode->i_sb);
        return block_page_mkwrite_return(err);