linux-kernel - Re: [PATCH 1/2] staging: exfat: clean up d

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Date:   Mon, 02 Mar 2020 05:29:54 -0500
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Tetsuhiro Kohada <Kohada.Tetsuhiro@...MitsubishiElectric.co.jp>
Cc:     Mori.Takahiro@...MitsubishiElectric.co.jp,
        motai.hirotaka@...mitsubishielectric.co.jp,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fsdevel@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging: exfat: clean up d_entry rebuilding.

On Mon, 02 Mar 2020 18:57:15 +0900, Tetsuhiro Kohada said:
> Clean up d_entry rebuilding in exfat_rename_file() and move_file().
>
> -Replace memcpy of d_entry with structure copy.

Those look OK.

> -Change to use the value already stored in fid.

> -		if (exfat_get_entry_type(epnew) == TYPE_FILE) {

> +		if (fid->type == TYPE_FILE) {

Are you sure this is OK to do? exfat_get_entry_type() does a lot of
mapping between values, using a file_dentry_t->type, while
fid->type is a file_id_t->type. and at first read it's not obvious to me whether
fid->type is guaranteed to have the correct value already.

(The abundant use of 0xNN constants in exfat_get_entry_type()  doesn't
inspire confidence that it's looking at what you think it's looking at...)



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