4.18-stable review patch. If anyone has any objections, please let me know.
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From: Chao Yu yuchao0@huawei.com
commit 4c58ed076875f36dae0f240da1e25e99e5d4afb8 upstream.
Below race can cause reversed reference on dirty count, fix it by relocating __submit_bio() and inc_page_count().
Thread A Thread B - f2fs_inplace_write_data - f2fs_submit_page_bio - __submit_bio - f2fs_write_end_io - dec_page_count - inc_page_count
Cc: stable@vger.kernel.org Fixes: d1b3e72d5490 ("f2fs: submit bio of in-place-update pages") Signed-off-by: Chao Yu yuchao0@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/f2fs/data.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -460,10 +460,10 @@ int f2fs_submit_page_bio(struct f2fs_io_
bio_set_op_attrs(bio, fio->op, fio->op_flags);
- __submit_bio(fio->sbi, bio, fio->type); - if (!is_read_io(fio->op)) inc_page_count(fio->sbi, WB_DATA_TYPE(fio->page)); + + __submit_bio(fio->sbi, bio, fio->type); return 0; }