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Message-ID: <276a17ed09cf6d53d17292b5182a8e08695251a4.camel@kernel.org>
Subject: Re: [PATCH v2 2/2] fs: Create a generic is_dot_dotdot() utility
From: Jeff Layton <jlayton@kernel.org>
To: Chuck Lever <cel@kernel.org>, amir73il@gmail.com
Cc: Chuck Lever <chuck.lever@oracle.com>, linux-fsdevel@vger.kernel.org, 
 linux-nfs@vger.kernel.org, trondmy@hammerspace.com,
 viro@zeniv.linux.org.uk,  brauner@kernel.org
Date: Wed, 03 Jan 2024 14:07:58 -0500
In-Reply-To: <170429518465.50646.9482690519449281531.stgit@bazille.1015granger.net>
References: 
	<170429478711.50646.12675561629884992953.stgit@bazille.1015granger.net>
	 <170429518465.50646.9482690519449281531.stgit@bazille.1015granger.net>
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On Wed, 2024-01-03 at 10:19 -0500, Chuck Lever wrote:
> From: Chuck Lever <chuck.lever@oracle.com>
>=20
> De-duplicate the same functionality in several places by hoisting
> the is_dot_dotdot() function into linux/fs.h.
>=20
> Suggested-by: Amir Goldstein <amir73il@gmail.com>
> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
> ---
>  fs/crypto/fname.c    |    8 +-------
>  fs/ecryptfs/crypto.c |   10 ----------
>  fs/exportfs/expfs.c  |    4 +---
>  fs/f2fs/f2fs.h       |   11 -----------
>  include/linux/fs.h   |    9 +++++++++
>  5 files changed, 11 insertions(+), 31 deletions(-)
>=20
> diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
> index 7b3fc189593a..0ad52fbe51c9 100644
> --- a/fs/crypto/fname.c
> +++ b/fs/crypto/fname.c
> @@ -74,13 +74,7 @@ struct fscrypt_nokey_name {
> =20
>  static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
>  {
> -	if (str->len =3D=3D 1 && str->name[0] =3D=3D '.')
> -		return true;
> -
> -	if (str->len =3D=3D 2 && str->name[0] =3D=3D '.' && str->name[1] =3D=3D=
 '.')
> -		return true;
> -
> -	return false;
> +	return is_dot_dotdot(str->name, str->len);
>  }
> =20
>  /**
> diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
> index 03bd55069d86..2fe0f3af1a08 100644
> --- a/fs/ecryptfs/crypto.c
> +++ b/fs/ecryptfs/crypto.c
> @@ -1949,16 +1949,6 @@ int ecryptfs_encrypt_and_encode_filename(
>  	return rc;
>  }
> =20
> -static bool is_dot_dotdot(const char *name, size_t name_size)
> -{
> -	if (name_size =3D=3D 1 && name[0] =3D=3D '.')
> -		return true;
> -	else if (name_size =3D=3D 2 && name[0] =3D=3D '.' && name[1] =3D=3D '.'=
)
> -		return true;
> -
> -	return false;
> -}
> -
>  /**
>   * ecryptfs_decode_and_decrypt_filename - converts the encoded cipher te=
xt name to decoded plaintext
>   * @plaintext_name: The plaintext name
> diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
> index 84af58eaf2ca..07ea3d62b298 100644
> --- a/fs/exportfs/expfs.c
> +++ b/fs/exportfs/expfs.c
> @@ -255,9 +255,7 @@ static bool filldir_one(struct dir_context *ctx, cons=
t char *name, int len,
>  		container_of(ctx, struct getdents_callback, ctx);
> =20
>  	buf->sequence++;
> -	/* Ignore the '.' and '..' entries */
> -	if ((len > 2 || name[0] !=3D '.' || (len =3D=3D 2 && name[1] !=3D '.'))=
 &&
> -	    buf->ino =3D=3D ino && len <=3D NAME_MAX) {
> +	if (buf->ino =3D=3D ino && len <=3D NAME_MAX && !is_dot_dotdot(name, le=
n)) {
>  		memcpy(buf->name, name, len);
>  		buf->name[len] =3D '\0';
>  		buf->found =3D 1;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 9043cedfa12b..322a3b8a3533 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3368,17 +3368,6 @@ static inline bool f2fs_cp_error(struct f2fs_sb_in=
fo *sbi)
>  	return is_set_ckpt_flags(sbi, CP_ERROR_FLAG);
>  }
> =20
> -static inline bool is_dot_dotdot(const u8 *name, size_t len)
> -{
> -	if (len =3D=3D 1 && name[0] =3D=3D '.')
> -		return true;
> -
> -	if (len =3D=3D 2 && name[0] =3D=3D '.' && name[1] =3D=3D '.')
> -		return true;
> -
> -	return false;
> -}
> -
>  static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi,
>  					size_t size, gfp_t flags)
>  {
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 98b7a7a8c42e..179eea797c22 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2846,6 +2846,15 @@ extern bool path_is_under(const struct path *, con=
st struct path *);
> =20
>  extern char *file_path(struct file *, char *, int);
> =20
> +static inline bool is_dot_dotdot(const char *name, size_t len)
> +{
> +	if (len =3D=3D 1 && name[0] =3D=3D '.')
> +		return true;
> +	if (len =3D=3D 2 && name[0] =3D=3D '.' && name[1] =3D=3D '.')
> +		return true;
> +	return false;
> +}
> +
>  #include <linux/err.h>
> =20
>  /* needed for stackable file system support */
>=20
>=20

Looks good to me. I took a quick look to see if there were other open-
coded versions, but I didn't see any.

Reviewed-by: Jeff Layton <jlayton@kernel.org>