From patchwork Fri Apr 29 00:43:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: NeilBrown X-Patchwork-Id: 12831360 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 E7653C433EF for ; Fri, 29 Apr 2022 00:44:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352954AbiD2AsJ (ORCPT ); Thu, 28 Apr 2022 20:48:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237629AbiD2AsJ (ORCPT ); Thu, 28 Apr 2022 20:48:09 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3596BB902; Thu, 28 Apr 2022 17:44:52 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id B2C411F37F; Fri, 29 Apr 2022 00:44:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1651193091; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iDTLraYqnWApa1mXlMLLgzsQSZO/JsdcUgftlr7aovM=; b=bXzdo1Li8rr31MrGP07OcLcXDfd+rqubbWEqzYmjFEDlXdbtGc0KLHhGyJjrU0cnYqWm40 IqBCEwDGvwIoA/HnKTxK7aOaSLe1o1TNZc0f5qPWLHCDXC9s1sriGavJJP/8mMHSq77gDx 9qLBQP+jKfuTloZX4Igjg5LrB92+6Xg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1651193091; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iDTLraYqnWApa1mXlMLLgzsQSZO/JsdcUgftlr7aovM=; b=1wMQN6a64l7rZ/v4UXE8U90xh7OGxjydYxyu1kmSUBId/NHpwcPt6Mw4IPLABKipjSx/M9 35I2hF4rrmhDshCA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 9A17E13491; Fri, 29 Apr 2022 00:44:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id blhJFgE1a2IzSgAAMHmgww (envelope-from ); Fri, 29 Apr 2022 00:44:49 +0000 Subject: [PATCH 2/2] NFS: rename nfs_direct_IO and use as ->swap_rw From: NeilBrown To: Andrew Morton Cc: Geert Uytterhoeven , Christoph Hellwig , Miaohe Lin , linux-nfs@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Fri, 29 Apr 2022 10:43:34 +1000 Message-ID: <165119301493.15698.7491285551903597618.stgit@noble.brown> In-Reply-To: <165119280115.15698.2629172320052218921.stgit@noble.brown> References: <165119280115.15698.2629172320052218921.stgit@noble.brown> User-Agent: StGit/1.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org The nfs_direct_IO() exists to support SWAP IO, but hasn't worked for a while. We now need a ->swap_rw function which behaves slightly differently, returning zero for success rather than a byte count. So modify nfs_direct_IO accordingly, rename it, and use it as the ->swap_rw function. Tested-by: Geert Uytterhoeven (on Renesas RSK+RZA1 with 32 MiB of SDRAM) Reviewed-by: Christoph Hellwig Signed-off-by: NeilBrown --- fs/nfs/direct.c | 23 ++++++++++------------- fs/nfs/file.c | 5 +---- include/linux/nfs_fs.h | 2 +- 3 files changed, 12 insertions(+), 18 deletions(-) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 11c566d8769f..4eb2a8380a28 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -153,28 +153,25 @@ nfs_direct_count_bytes(struct nfs_direct_req *dreq, } /** - * nfs_direct_IO - NFS address space operation for direct I/O + * nfs_swap_rw - NFS address space operation for swap I/O * @iocb: target I/O control block * @iter: I/O buffer * - * The presence of this routine in the address space ops vector means - * the NFS client supports direct I/O. However, for most direct IO, we - * shunt off direct read and write requests before the VFS gets them, - * so this method is only ever called for swap. + * Perform IO to the swap-file. This is much like direct IO. */ -ssize_t nfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) +int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter) { - struct inode *inode = iocb->ki_filp->f_mapping->host; - - /* we only support swap file calling nfs_direct_IO */ - if (!IS_SWAPFILE(inode)) - return 0; + ssize_t ret; VM_BUG_ON(iov_iter_count(iter) != PAGE_SIZE); if (iov_iter_rw(iter) == READ) - return nfs_file_direct_read(iocb, iter, true); - return nfs_file_direct_write(iocb, iter, true); + ret = nfs_file_direct_read(iocb, iter, true); + else + ret = nfs_file_direct_write(iocb, iter, true); + if (ret < 0) + return ret; + return 0; } static void nfs_direct_release_pages(struct page **pages, unsigned int npages) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index e1d10a3e086a..bfb4b707b07e 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -490,10 +490,6 @@ static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file, struct rpc_clnt *clnt = NFS_CLIENT(inode); struct nfs_client *cl = NFS_SERVER(inode)->nfs_client; - if (!file->f_mapping->a_ops->swap_rw) - /* Cannot support swap */ - return -EINVAL; - spin_lock(&inode->i_lock); blocks = inode->i_blocks; isize = inode->i_size; @@ -550,6 +546,7 @@ const struct address_space_operations nfs_file_aops = { .error_remove_page = generic_error_remove_page, .swap_activate = nfs_swap_activate, .swap_deactivate = nfs_swap_deactivate, + .swap_rw = nfs_swap_rw, }; /* diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index b48b9259e02c..fd5543486a3f 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -507,7 +507,7 @@ static inline const struct cred *nfs_file_cred(struct file *file) /* * linux/fs/nfs/direct.c */ -extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *); +int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter); ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter, bool swap); ssize_t nfs_file_direct_write(struct kiocb *iocb,