From patchwork Sat Dec 31 15:09:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 13086101 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 93F49C53210 for ; Sat, 31 Dec 2022 15:11:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235678AbiLaPLM (ORCPT ); Sat, 31 Dec 2022 10:11:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231481AbiLaPLE (ORCPT ); Sat, 31 Dec 2022 10:11:04 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90961B85D for ; Sat, 31 Dec 2022 07:09:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1672499382; 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=UPIwcUbZUfu3w21+Fb54YjfLv2mmYWzObZnyM39KbhE=; b=i5BXq1uDkJDhje5ta7A5MuosyFC+rd7ZwahNhylKNwCyil9OnyMfFqanBaogfGcj3UZUyS TI9yq3owXdt2+qXJwVo2NFsKRmuigUlfaScs+bRcpYaEHVjoSVpBIWPMO//LgVzaGHnSv5 xcAvv6Xi1YBITLmHFk0a+pqyIme5T3c= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-403-QPYCuytsN6qi_6-tn3Vs8w-1; Sat, 31 Dec 2022 10:09:38 -0500 X-MC-Unique: QPYCuytsN6qi_6-tn3Vs8w-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 504DA101A521; Sat, 31 Dec 2022 15:09:38 +0000 (UTC) Received: from pasta.redhat.com (ovpn-192-3.brq.redhat.com [10.40.192.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3DBFF492B00; Sat, 31 Dec 2022 15:09:36 +0000 (UTC) From: Andreas Gruenbacher To: Christoph Hellwig , "Darrick J . Wong" , Alexander Viro , Matthew Wilcox Cc: Andreas Gruenbacher , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, cluster-devel@redhat.com Subject: [PATCH v5 4/9] iomap: Add iomap_get_folio helper Date: Sat, 31 Dec 2022 16:09:14 +0100 Message-Id: <20221231150919.659533-5-agruenba@redhat.com> In-Reply-To: <20221231150919.659533-1-agruenba@redhat.com> References: <20221231150919.659533-1-agruenba@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add an iomap_get_folio() helper that gets a folio reference based on an iomap iterator and an offset into the address space. Use it in iomap_write_begin(). Signed-off-by: Andreas Gruenbacher Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/iomap/buffered-io.c | 39 ++++++++++++++++++++++++++++++--------- include/linux/iomap.h | 1 + 2 files changed, 31 insertions(+), 9 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 2a9bab4f3c79..b84838d2b5d8 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -457,6 +457,33 @@ bool iomap_is_partially_uptodate(struct folio *folio, size_t from, size_t count) } EXPORT_SYMBOL_GPL(iomap_is_partially_uptodate); +/** + * iomap_get_folio - get a folio reference for writing + * @iter: iteration structure + * @pos: start offset of write + * + * Returns a locked reference to the folio at @pos, or an error pointer if the + * folio could not be obtained. + */ +struct folio *iomap_get_folio(struct iomap_iter *iter, loff_t pos) +{ + unsigned fgp = FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE | FGP_NOFS; + struct folio *folio; + + if (iter->flags & IOMAP_NOWAIT) + fgp |= FGP_NOWAIT; + + folio = __filemap_get_folio(iter->inode->i_mapping, pos >> PAGE_SHIFT, + fgp, mapping_gfp_mask(iter->inode->i_mapping)); + if (folio) + return folio; + + if (iter->flags & IOMAP_NOWAIT) + return ERR_PTR(-EAGAIN); + return ERR_PTR(-ENOMEM); +} +EXPORT_SYMBOL_GPL(iomap_get_folio); + bool iomap_release_folio(struct folio *folio, gfp_t gfp_flags) { trace_iomap_release_folio(folio->mapping->host, folio_pos(folio), @@ -603,12 +630,8 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos, const struct iomap_page_ops *page_ops = iter->iomap.page_ops; const struct iomap *srcmap = iomap_iter_srcmap(iter); struct folio *folio; - unsigned fgp = FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE | FGP_NOFS; int status = 0; - if (iter->flags & IOMAP_NOWAIT) - fgp |= FGP_NOWAIT; - BUG_ON(pos + len > iter->iomap.offset + iter->iomap.length); if (srcmap != &iter->iomap) BUG_ON(pos + len > srcmap->offset + srcmap->length); @@ -625,12 +648,10 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos, return status; } - folio = __filemap_get_folio(iter->inode->i_mapping, pos >> PAGE_SHIFT, - fgp, mapping_gfp_mask(iter->inode->i_mapping)); - if (!folio) { - status = (iter->flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOMEM; + folio = iomap_get_folio(iter, pos); + if (IS_ERR(folio)) { iomap_put_folio(iter, pos, 0, NULL); - return status; + return PTR_ERR(folio); } /* diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 10ec36f373f4..e5732cc5716b 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -261,6 +261,7 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, int iomap_read_folio(struct folio *folio, const struct iomap_ops *ops); void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops); bool iomap_is_partially_uptodate(struct folio *, size_t from, size_t count); +struct folio *iomap_get_folio(struct iomap_iter *iter, loff_t pos); bool iomap_release_folio(struct folio *folio, gfp_t gfp_flags); void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len); int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,