Re: [PATCH] f2fs: fix ifolio leak in f2fs_move_inline_dirents

[Guanghui Yang]

Thanks for taking a look.

f2fs_reserve_block() drops the dnode only when the inode folio was not
provided by the caller:

        bool need_put = dn->inode_folio ? false : true;
        ...
        if (err || need_put)
                f2fs_put_dnode(dn);

In this path, f2fs_move_inline_dirents() passes ifolio through
set_new_dnode(), so need_put is false and f2fs_reserve_block() keeps the
caller-provided folio.

The caller of do_convert_inline_dir() also drops ifolio only on success:

        err = do_convert_inline_dir(dir, ifolio, inline_dentry);
        if (!err)
                f2fs_folio_put(ifolio, true);

Therefore, when f2fs_reserve_block() fails, the ifolio reference still
appears to need cleanup in f2fs_move_inline_dirents(). I kept the cleanup
local to avoid changing f2fs_reserve_block() semantics for other callers.

Thanks,
Guanghui