From patchwork Fri Aug 25 13:54:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xu X-Patchwork-Id: 13365920 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 lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8D78C71133 for ; Fri, 25 Aug 2023 14:07:34 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-4.v29.lw.sourceforge.com) by sfs-ml-4.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1qZXTJ-00058C-Sn; Fri, 25 Aug 2023 14:07:34 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-4.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1qZXTJ-000586-4v for linux-f2fs-devel@lists.sourceforge.net; Fri, 25 Aug 2023 14:07:33 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=NAMtHKwgj081g8lIPVs72MliioxtTYHj7D9CTN85ELE=; b=SDb2EgYqLLTpCnJf52n+bEBfeV PUa2jfod+hMG8Sd1jaexhIFOMRXIj9GrnqRgNtbdsuWavqwRIyHXzncZlbM4+b0TyYKDI3uW3EkMi HbVHM2SXb4njSuk+VyW+nTE6BeA1+X2cAOrfvO9LPddJ3UD0HbPbHWVHLRfCu7rGkHsk=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=NAMtHKwgj081g8lIPVs72MliioxtTYHj7D9CTN85ELE=; b=Ep/NusOFByjSDmMT/rIZKzAzQG GGIFLDFRcOTUgwSuG28uRTLNVufGegUV4ANpkQDEnuJ+qWI6+PTx9ocBz6c7zfhp9sxMS9SkU0rIr SFU4pAMn6FnWuZkPqo4cFpqxvkXOY7K/qyYG+6L2Mgj78CowcGTEyJ2LeDRL2No/JH2w=; Received: from out-248.mta1.migadu.com ([95.215.58.248]) by sfi-mx-1.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1qZXTI-00FIEl-65 for linux-f2fs-devel@lists.sourceforge.net; Fri, 25 Aug 2023 14:07:33 +0000 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=1692972442; 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=NAMtHKwgj081g8lIPVs72MliioxtTYHj7D9CTN85ELE=; b=sbYFUS6BU4QMfloFkojbf7LlIvBmbwqI6WjTGL8/Nwev4csxD24mU9E4d6JXOYCR7eZA1m PqI1zbyFtIGUv/PonAelJnAkImEIFlhA1NIhorTVqtvxfqefn7QdiSQXQ23nqD5sCFBkVJ VzfeXLG9iKOnGGbqPpV4YVYm/Xq84uM= From: Hao Xu To: io-uring@vger.kernel.org, Jens Axboe Date: Fri, 25 Aug 2023 21:54:31 +0800 Message-Id: <20230825135431.1317785-30-hao.xu@linux.dev> In-Reply-To: <20230825135431.1317785-1-hao.xu@linux.dev> References: <20230825135431.1317785-1-hao.xu@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Headers-End: 1qZXTI-00FIEl-65 Subject: [f2fs-dev] [PATCH 29/29] io_uring: add support for getdents X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wanpeng Li , "Darrick J . Wong" , Dominique Martinet , Dave Chinner , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Stefan Roesch , Clay Harris , linux-s390@vger.kernel.org, linux-nilfs@vger.kernel.org, codalist@coda.cs.cmu.edu, cluster-devel@redhat.com, linux-cachefs@redhat.com, linux-ext4@vger.kernel.org, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-block@vger.kernel.org, Alexander Viro , Christian Brauner , netdev@vger.kernel.org, samba-technical@lists.samba.org, linux-unionfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mtd@lists.infradead.org, bpf@vger.kernel.org, Pavel Begunkov , linux-btrfs@vger.kernel.org Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Hao Xu This add support for getdents64 to io_uring, acting exactly like the syscall: the directory is iterated from it's current's position as stored in the file struct, and the file's position is updated exactly as if getdents64 had been called. For filesystems that support NOWAIT in iterate_shared(), try to use it first; if a user already knows the filesystem they use do not support nowait they can force async through IOSQE_ASYNC in the sqe flags, avoiding the need to bounce back through a useless EAGAIN return. Co-developed-by: Dominique Martinet Signed-off-by: Dominique Martinet Signed-off-by: Hao Xu --- include/uapi/linux/io_uring.h | 1 + io_uring/fs.c | 53 +++++++++++++++++++++++++++++++++++ io_uring/fs.h | 3 ++ io_uring/opdef.c | 8 ++++++ 4 files changed, 65 insertions(+) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 8e61f8b7c2ce..3896397a1998 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -240,6 +240,7 @@ enum io_uring_op { IORING_OP_URING_CMD, IORING_OP_SEND_ZC, IORING_OP_SENDMSG_ZC, + IORING_OP_GETDENTS, /* this goes last, obviously */ IORING_OP_LAST, diff --git a/io_uring/fs.c b/io_uring/fs.c index f6a69a549fd4..04711feac4e6 100644 --- a/io_uring/fs.c +++ b/io_uring/fs.c @@ -47,6 +47,12 @@ struct io_link { int flags; }; +struct io_getdents { + struct file *file; + struct linux_dirent64 __user *dirent; + unsigned int count; +}; + int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename); @@ -291,3 +297,50 @@ void io_link_cleanup(struct io_kiocb *req) putname(sl->oldpath); putname(sl->newpath); } + +int io_getdents_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_getdents *gd = io_kiocb_to_cmd(req, struct io_getdents); + + if (READ_ONCE(sqe->off)) + return -EINVAL; + + gd->dirent = u64_to_user_ptr(READ_ONCE(sqe->addr)); + gd->count = READ_ONCE(sqe->len); + + return 0; +} + +int io_getdents(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_getdents *gd = io_kiocb_to_cmd(req, struct io_getdents); + struct file *file = req->file; + unsigned long getdents_flags = 0; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + bool locked; + int ret; + + if (force_nonblock) { + if (!(file->f_flags & O_NONBLOCK) && + !(file->f_mode & FMODE_NOWAIT)) + return -EAGAIN; + + getdents_flags = DIR_CONTEXT_F_NOWAIT; + } + + ret = file_pos_lock_nowait(file, force_nonblock); + if (ret == -EAGAIN) + return ret; + locked = ret; + + ret = vfs_getdents(file, gd->dirent, gd->count, getdents_flags); + if (locked) + file_pos_unlock(file); + + if (ret == -EAGAIN && force_nonblock) + return -EAGAIN; + + io_req_set_res(req, ret, 0); + return 0; +} + diff --git a/io_uring/fs.h b/io_uring/fs.h index 0bb5efe3d6bb..f83a6f3a678d 100644 --- a/io_uring/fs.h +++ b/io_uring/fs.h @@ -18,3 +18,6 @@ int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags); int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); int io_linkat(struct io_kiocb *req, unsigned int issue_flags); void io_link_cleanup(struct io_kiocb *req); + +int io_getdents_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_getdents(struct io_kiocb *req, unsigned int issue_flags); diff --git a/io_uring/opdef.c b/io_uring/opdef.c index 3b9c6489b8b6..1bae6b2a8d0b 100644 --- a/io_uring/opdef.c +++ b/io_uring/opdef.c @@ -428,6 +428,11 @@ const struct io_issue_def io_issue_defs[] = { .prep = io_eopnotsupp_prep, #endif }, + [IORING_OP_GETDENTS] = { + .needs_file = 1, + .prep = io_getdents_prep, + .issue = io_getdents, + }, }; @@ -648,6 +653,9 @@ const struct io_cold_def io_cold_defs[] = { .fail = io_sendrecv_fail, #endif }, + [IORING_OP_GETDENTS] = { + .name = "GETDENTS", + }, }; const char *io_uring_get_opcode(u8 opcode)