linux-kernel - Re: [PATCH RFC 1/2] fs: split off vfs_getdents function of getdents64 syscall

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Date:   Sat, 22 Apr 2023 19:34:59 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Stefan Roesch <shr@...com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] fs: split off vfs_getdents function of
 getdents64 syscall

Dominique Martinet wrote on Sat, Apr 22, 2023 at 05:40:18PM +0900:
> This splits off the vfs_getdents function from the getdents64 system
> call.
> This will allow io_uring to call the vfs_getdents function.
> 
> Co-authored-by: Stefan Roesch <shr@...com>
> Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
> ---
>  fs/internal.h |  8 ++++++++
>  fs/readdir.c  | 33 +++++++++++++++++++++++++--------
>  2 files changed, 33 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/internal.h b/fs/internal.h
> index dc4eb91a577a..92eeaf3837d1 100644
> --- a/fs/internal.h
> +++ b/fs/internal.h
> @@ -264,3 +264,11 @@ int setattr_should_drop_sgid(struct mnt_idmap *idmap,
>  struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
>  struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
>  void mnt_idmap_put(struct mnt_idmap *idmap);
> +
> +/*
> + * fs/readdir.c
> + */
> +struct linux_dirent64;
> +
> +int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent,
> +		 unsigned int count);
> diff --git a/fs/readdir.c b/fs/readdir.c
> index 9c53edb60c03..1d541a6f2d55 100644
> --- a/fs/readdir.c
> +++ b/fs/readdir.c

(This needs an extra `#include "internal.h"`, missing declaration
warning reported privately by intel build robot... fs/ doesn't build
with W=1 by default; I'll resend v2 after some comments it doesn't make
much sense to spam patches at this point)

--
Dominique