linux-kernel - Re: [RFC PATCH 1/4] Revert "libfs: unexport generic_ci_d_compare() and generic_ci_d

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Date:   Tue, 23 Mar 2021 20:15:30 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     André Almeida <andrealmeid@...labora.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        krisman@...labora.com, smcv@...labora.com, kernel@...labora.com,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Rosenberg <drosen@...gle.com>
Subject: Re: [RFC PATCH 1/4] Revert "libfs: unexport generic_ci_d_compare()
 and generic_ci_d_hash()"

On Tue, Mar 23, 2021 at 04:59:38PM -0300, André Almeida wrote:
> This reverts commit 794c43f716845e2d48ce195ed5c4179a4e05ce5f.
> 
> For implementing casefolding support at tmpfs, it needs to set dentry
> operations at superblock level, given that tmpfs has no support for
> fscrypt and we don't need to set operations on a per-dentry basis.
> Revert this commit so we can access those exported function from tmpfs
> code.

But tmpfs / shmem are Kconfig bools, not tristate.  They can't be built
as modules, so there's no need to export the symbols.

> +#ifdef CONFIG_UNICODE
> +extern int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str);
> +extern int generic_ci_d_compare(const struct dentry *dentry, unsigned int len,
> +				const char *str, const struct qstr *name);
> +#endif

There's no need for the ifdef (it only causes unnecessary rebuilds) and
the 'extern' keyword is also unwelcome.