On Fri, Feb 09, 2024 at 01:20:21AM +0800, Kemeng Shi wrote:
> I_DIRTY_ALL consists of I_DIRTY_TIME and I_DIRTY, so I_DIRTY_TIME must
> be set when any bit of I_DIRTY_ALL is set but I_DIRTY is not set.
>
> Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
> ---
> fs/fs-writeback.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 2619f74ced70..b61bf2075931 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -1788,7 +1788,7 @@ static int writeback_single_inode(struct inode *inode,
> else if (!(inode->i_state & I_SYNC_QUEUED)) {
> if ((inode->i_state & I_DIRTY))
> redirty_tail_locked(inode, wb);
> - else if (inode->i_state & I_DIRTY_TIME) {
> + else {
> inode->dirtied_when = jiffies;
> inode_io_list_move_locked(inode,
> wb,
NAK.
The code is correct and the behaviour that is intended it obvious
from the code as it stands.
It is -incorrect- to move any inode that does not have I_DIRTY_TIME
to the wb->b_dirty_time list. By removing the I_DIRTY_TIME guard
from this code, you are leaving a nasty, undocumented logic trap in
the code that somebody is guaranteed to trip over into in the
future. That's making the code worse, not better....
-Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
