---- 在 星期四, 2021-10-07 17:23:06 Miklos Szeredi <miklos@xxxxxxxxxx> 撰写 ----
> On Thu, 23 Sept 2021 at 15:08, Chengguang Xu <cgxu519@xxxxxxxxxxxx> wrote:
> >
> > Implement overlayfs' ->write_inode to sync dirty data
> > and redirty overlayfs' inode if necessary.
> >
> > Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
> > ---
> > fs/overlayfs/super.c | 30 ++++++++++++++++++++++++++++++
> > 1 file changed, 30 insertions(+)
> >
> > diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
> > index 2ab77adf7256..cddae3ca2fa5 100644
> > --- a/fs/overlayfs/super.c
> > +++ b/fs/overlayfs/super.c
> > @@ -412,12 +412,42 @@ static void ovl_evict_inode(struct inode *inode)
> > clear_inode(inode);
> > }
> >
> > +static int ovl_write_inode(struct inode *inode,
> > + struct writeback_control *wbc)
> > +{
> > + struct ovl_fs *ofs = inode->i_sb->s_fs_info;
> > + struct inode *upper = ovl_inode_upper(inode);
> > + unsigned long iflag = 0;
> > + int ret = 0;
> > +
> > + if (!upper)
> > + return 0;
> > +
> > + if (!ovl_should_sync(ofs))
> > + return 0;
> > +
> > + if (upper->i_sb->s_op->write_inode)
> > + ret = upper->i_sb->s_op->write_inode(inode, wbc);
>
> Where is page writeback on upper inode triggered?
>
Should pass upper inode instead of overlay inode here.
Thanks,
Chengguang
