From patchwork Sun Aug 27 13:28:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xu X-Patchwork-Id: 13367150 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14463C83F1B for ; Sun, 27 Aug 2023 13:31:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230298AbjH0NbE (ORCPT ); Sun, 27 Aug 2023 09:31:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230255AbjH0Nah (ORCPT ); Sun, 27 Aug 2023 09:30:37 -0400 Received: from out-248.mta1.migadu.com (out-248.mta1.migadu.com [95.215.58.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4CCA132; Sun, 27 Aug 2023 06:30:33 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1693143032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=M7eywqhb1fMAXTeyjh6BJsPONBLehGvo8wJ7nQSmBJs=; b=khOm1xqjzQOlsKc47XQ2wnLOjuLxGwc+XfDxixj6hJjWBxivRVL9fw6eYA8IJoeNHelD6C SUgrSKu6uB34cMFyQmJmkAayvfASH0HpKYFjusAGKkd85NiwXc4z0BEmZwpbN0iGNr9iqa ll1Q4czDD51HD91ihhmFa2NNXU3DhMY= From: Hao Xu To: io-uring@vger.kernel.org, Jens Axboe Cc: Dominique Martinet , Pavel Begunkov , Christian Brauner , Alexander Viro , Stefan Roesch , Clay Harris , Dave Chinner , "Darrick J . Wong" , linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-cachefs@redhat.com, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-unionfs@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-btrfs@vger.kernel.org, codalist@coda.cs.cmu.edu, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-mm@kvack.org, linux-nilfs@vger.kernel.org, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-mtd@lists.infradead.org, Wanpeng Li Subject: [PATCH 01/11] fs: split off vfs_getdents function of getdents64 syscall Date: Sun, 27 Aug 2023 21:28:25 +0800 Message-Id: <20230827132835.1373581-2-hao.xu@linux.dev> In-Reply-To: <20230827132835.1373581-1-hao.xu@linux.dev> References: <20230827132835.1373581-1-hao.xu@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Dominique Martinet This splits off the vfs_getdents function from the getdents64 system call. This will allow io_uring to call the vfs_getdents function. Co-developed-by: Stefan Roesch Signed-off-by: Stefan Roesch Signed-off-by: Dominique Martinet Signed-off-by: Hao Xu --- fs/internal.h | 8 ++++++++ fs/readdir.c | 34 ++++++++++++++++++++++++++-------- 2 files changed, 34 insertions(+), 8 deletions(-) diff --git a/fs/internal.h b/fs/internal.h index f7a3dc111026..b1f66e52d61b 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -304,3 +304,11 @@ ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *po 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 b264ce60114d..9592259b7e7f 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -21,6 +21,7 @@ #include #include #include +#include "internal.h" #include @@ -351,10 +352,16 @@ static bool filldir64(struct dir_context *ctx, const char *name, int namlen, return false; } -SYSCALL_DEFINE3(getdents64, unsigned int, fd, - struct linux_dirent64 __user *, dirent, unsigned int, count) + +/** + * vfs_getdents - getdents without fdget + * @file : pointer to file struct of directory + * @dirent : pointer to user directory structure + * @count : size of buffer + */ +int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent, + unsigned int count) { - struct fd f; struct getdents_callback64 buf = { .ctx.actor = filldir64, .count = count, @@ -362,11 +369,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd, }; int error; - f = fdget_pos(fd); - if (!f.file) - return -EBADF; - - error = iterate_dir(f.file, &buf.ctx); + error = iterate_dir(file, &buf.ctx); if (error >= 0) error = buf.error; if (buf.prev_reclen) { @@ -379,6 +382,21 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd, else error = count - buf.count; } + return error; +} + +SYSCALL_DEFINE3(getdents64, unsigned int, fd, + struct linux_dirent64 __user *, dirent, unsigned int, count) +{ + struct fd f; + int error; + + f = fdget_pos(fd); + if (!f.file) + return -EBADF; + + error = vfs_getdents(f.file, dirent, count); + fdput_pos(f); return error; }