Re: [f2fs-dev] [PATCH] f2fs: prevent compressed file from being disabled after releasing cblocks

[Chao Yu]

On 2020/8/31 7:42, Daeho Jeong wrote:
> Do you have any reason not to put this check here?

No, the place is okay to me. :)

> If we do this check outside of here, we definitely make a mistake
> sooner or later.

I just want to see whether we can cover all cases in where we missed to
add immutable check condition if necessary.

Thanks,

> 2020년 8월 30일 (일) 오후 12:24, Chao Yu <chao@xxxxxxxxxx>님이 작성:
> > On 2020-8-28 13:46, Daeho Jeong wrote:
> > > From: Daeho Jeong <daehojeong@xxxxxxxxxx>
> > >
> > > After releasing cblocks, the compressed file can be accidentally
> > > disabled in compression mode, since it has zero cblocks. As we are
> > > using IMMUTABLE flag to present released cblocks state, we can add
> > > IMMUTABLE state check when considering the compressed file disabling.
> > >
> > > Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
> > > ---
> > >   fs/f2fs/f2fs.h | 2 ++
> > >   1 file changed, 2 insertions(+)
> > >
> > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > > index 02811ce15059..14d30740ba03 100644
> > > --- a/fs/f2fs/f2fs.h
> > > +++ b/fs/f2fs/f2fs.h
> > > @@ -3936,6 +3936,8 @@ static inline u64 f2fs_disable_compressed_file(struct inode *inode)
> > >        if (!f2fs_compressed_file(inode))
> > >                return 0;
> > >        if (S_ISREG(inode->i_mode)) {
> > > +             if (IS_IMMUTABLE(inode))
> > > +                     return 1;
> >
> > It looks most of callers are from ioctl, should we add immutable check in f2fs
> > ioctl interfaces if necessary? or I missed existed check.
> >
> > Thanks,
> >
> > >                if (get_dirty_pages(inode))
> > >                        return 1;
> > >                if (fi->i_compr_blocks)
>
>
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