From mboxrd@z Thu Jan 1 00:00:00 1970 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 4114FEB64DA for ; Tue, 18 Jul 2023 13:22:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232699AbjGRNWC (ORCPT ); Tue, 18 Jul 2023 09:22:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232701AbjGRNVi (ORCPT ); Tue, 18 Jul 2023 09:21:38 -0400 Received: from out-52.mta0.migadu.com (out-52.mta0.migadu.com [91.218.175.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C797B170D for ; Tue, 18 Jul 2023 06:21:37 -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=1689686496; 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=e5tdpTadoLYdZJB8cQ8K1ymkQcAcLx9XJrtCjJGJaVs=; b=BDFNXL5SyhanwGjSp9H3JcUxF9FJyYHjc5mRUjs0KvEPz4iwpDWr2EZ27A09CGETB3uayX Pp7nztzQr9b2mDmFt87cf/FLuj3CVJG/9lQ975PmlCYDEBNNhbF6FIGcUBTXWgRsKe3bMO 7ta+qcVtBFiyJrd99WTSWuUgDgBeOlE= 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 , linux-fsdevel@vger.kernel.org, Wanpeng Li Subject: [PATCH 2/5] vfs_getdents/struct dir_context: add flags field Date: Tue, 18 Jul 2023 21:21:09 +0800 Message-Id: <20230718132112.461218-3-hao.xu@linux.dev> In-Reply-To: <20230718132112.461218-1-hao.xu@linux.dev> References: <20230718132112.461218-1-hao.xu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Hao Xu The flags will allow passing DIR_CONTEXT_F_NOWAIT to iterate() implementations that support it (as signaled through FMODE_NWAIT in file->f_mode) Notes: - considered using IOCB_NOWAIT but if we add more flags later it would be confusing to keep track of which values are valid, use dedicated flags - might want to check ctx.flags & DIR_CONTEXT_F_NOWAIT is only set when file->f_mode & FMODE_NOWAIT in iterate_dir() as e.g. WARN_ONCE? Co-developed-by: Dominique Martinet Signed-off-by: Dominique Martinet Signed-off-by: Hao Xu --- fs/internal.h | 2 +- fs/readdir.c | 6 ++++-- include/linux/fs.h | 8 ++++++++ 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/fs/internal.h b/fs/internal.h index b1f66e52d61b..7508d485c655 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -311,4 +311,4 @@ void mnt_idmap_put(struct mnt_idmap *idmap); struct linux_dirent64; int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent, - unsigned int count); + unsigned int count, unsigned long flags); diff --git a/fs/readdir.c b/fs/readdir.c index 9592259b7e7f..b80caf4c9321 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -358,12 +358,14 @@ static bool filldir64(struct dir_context *ctx, const char *name, int namlen, * @file : pointer to file struct of directory * @dirent : pointer to user directory structure * @count : size of buffer + * @flags : additional dir_context flags */ int vfs_getdents(struct file *file, struct linux_dirent64 __user *dirent, - unsigned int count) + unsigned int count, unsigned long flags) { struct getdents_callback64 buf = { .ctx.actor = filldir64, + .ctx.flags = flags, .count = count, .current_dir = dirent }; @@ -395,7 +397,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd, if (!f.file) return -EBADF; - error = vfs_getdents(f.file, dirent, count); + error = vfs_getdents(f.file, dirent, count, 0); fdput_pos(f); return error; diff --git a/include/linux/fs.h b/include/linux/fs.h index 6867512907d6..f3e315e8efdd 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1719,8 +1719,16 @@ typedef bool (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, struct dir_context { filldir_t actor; loff_t pos; + unsigned long flags; }; +/* + * flags for dir_context flags + * DIR_CONTEXT_F_NOWAIT: Request non-blocking iterate + * (requires file->f_mode & FMODE_NOWAIT) + */ +#define DIR_CONTEXT_F_NOWAIT (1 << 0) + /* * These flags let !MMU mmap() govern direct device mapping vs immediate * copying more easily for MAP_PRIVATE, especially for ROM filesystems. -- 2.25.1