linux-kernel - Re: [PATCH 02/26] fscrypto: Constify struct inode pointer

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Message-ID: <20161021145720.raaeyivtonf2ynmb@thunk.org>
Date:   Fri, 21 Oct 2016 10:57:20 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Richard Weinberger <richard@....at>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, dedekind1@...il.com,
        adrian.hunter@...el.com, jaegeuk@...nel.org, david@...ma-star.at,
        wd@...x.de, sbabic@...x.de, dengler@...utronix.de
Subject: Re: [PATCH 02/26] fscrypto: Constify struct inode pointer

On Fri, Oct 21, 2016 at 02:48:17PM +0200, Richard Weinberger wrote:
> Some filesystems, such as UBIFS, maintain a const pointer
> for struct inode.
> 
>  /* fname.c */
> -extern int fscrypt_setup_filename(struct inode *, const struct qstr *,
> -				int lookup, struct fscrypt_name *);
> +extern int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
> +			   int lookup, struct fscrypt_name *fname);

Was it deliberate that you didn't add a const pointer here?

I take it that ubifs is basically using const in certain places to
essentially promise that those functions don't actually modify the
inode structure?

							- Ted